HUAWEI SUN2000SUN2000 Battery Ready Three Phase inverter User Manual

: June 10, 2024
: Huawei

Table of Contents

SUN2000SUN2000 Battery Ready Three Phase inverter
Product Information: SUN2000-(75KTL, 100KTL, 110KTL, 125KTL)
Intended Audience
Symbol Conventions
Product Usage Instructions
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

SUN2000SUN2000 Battery Ready Three Phase inverter

Product Information: SUN2000-(75KTL, 100KTL, 110KTL, 125KTL)

Series User Manual

The SUN2000 series, including SUN2000-125KTL-M0,
SUN2000-110KTL-M0, SUN2000-100KTL-M0, SUN2000-100KTL-M1,
SUN2000-100KTL-INM0, and SUN2000-75KTL-M1, is a photovoltaic (PV)
inverter designed for installation, electrical connection,
commissioning, maintenance, and troubleshooting in PV plants. The
product manual provides detailed instructions and safety
precautions for ensuring proper usage of the inverter.

Intended Audience

The product manual is intended for PV plant operating personnel
and qualified electricians.

Symbol Conventions

The product manual uses the following symbols:

Danger: Indicates a hazard with a high level
of risk which, if not avoided, will result in death or serious
injury.
Warning: Indicates a hazard with a medium
level of risk which, if not avoided, could result in death or
serious injury.
Caution: Indicates a hazard with a low level
of risk which, if not avoided, could result in minor or moderate
injury.
Notice: Indicates a potentially hazardous
situation which, if not avoided, could result in equipment damage,
data loss, performance deterioration, or unanticipated
results.
Note: Supplements the important information in
the main text. NOTE is used to address information not related to
personal injury, equipment damage, and environment
deterioration.

Product Usage Instructions

Before installing and operating the SUN2000 inverter, carefully
read and understand the instructions and safety precautions
provided in the product manual. Failure to follow these
instructions may result in personal injury or equipment damage.

Installation: Install the inverter according
to the instructions provided in the manual. Ensure that the
installation location is well-ventilated and that there is no dust,
corrosive gas, or direct sunlight. Install the inverter at a
location where it is not exposed to direct sunlight or in a place
that is prone to flooding or high humidity.
Electrical Connection: Connect the SUN2000
inverter to the PV system according to the instructions provided in
the product manual. Ensure that the DC and AC input cables are
properly connected and tightened. Follow all grounding and wiring
requirements specified in the manual.
Commissioning: After installing and connecting
the SUN2000 inverter, follow the commissioning procedures provided
in the manual. Check for any warning or error messages on the
display panel and resolve them if necessary.
Maintenance: Regularly inspect and maintain
the SUN2000 inverter according to the maintenance schedule provided
in the manual. Clean the air filters and replace them if necessary.
Check for any signs of corrosion, loose connections, or damage to
components.
Troubleshooting: If there are any issues with
the SUN2000 inverter, follow the troubleshooting procedures
provided in the manual. Check for any warning or error messages on
the display panel and resolve them if necessary.

For more detailed information on product usage, refer to the
SUN2000-(75KTL, 100KTL, 110KTL, 125KTL) Series User Manual.

SUN2000-(75KTL, 100KTL, 110KTL, 125KTL) Series
User Manual

Issue Date

13 2022-06-20

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2022. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.
Trademarks and Permissions
and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders.
Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, and recommendations in this document are provided “AS IS” without warranties, guarantees or representations of any kind, either express or implied.
The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Technologies Co., Ltd.

Address:

Huawei Industrial Base Bantian, Longgang Shenzhen 518129 People’s Republic of China

Website:

https://e.huawei.com

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About This Document

Overview
This document describes the SUN2000-125KTL-M0, SUN2000-110KTL-M0, SUN2000-100KTL-M0, SUN2000-100KTL-M1, SUN2000-100KTL-INM0, and SUN2000-75KTL-M1 (also referred to as SUN2000) in terms of installation, electrical connection, commissioning, maintenance, and troubleshooting. Before installing and operating the solar inverter, ensure that you are familiar with the features, functions, and safety precautions provided in this document.

Intended Audience
This document is intended for photovoltaic (PV) plant operating personnel and qualified electricians.

Symbol Conventions

The symbols that may be found in this document are defined as follows.

Symbol

Description
Indicates a hazard with a high level of risk which, if not avoided, will result in death or serious injury.
Indicates a hazard with a medium level of risk which, if not avoided, could result in death or serious injury.
Indicates a hazard with a low level of risk which, if not avoided, could result in minor or moderate injury.
Indicates a potentially hazardous situation which, if not avoided, could result in equipment damage, data loss, performance deterioration, or unanticipated results.
NOTICE is used to address practices not related to personal injury.

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Symbol

About This Document
Description
Supplements the important information in the main text. NOTE is used to address information not related to personal injury, equipment damage, and environment deterioration.

Change History
Changes between document issues are cumulative. The latest document issue contains all the changes made in earlier issues.

Issue 13 (2022-06-20)
Updated 5.7 Connecting DC Input Power Cables. Updated 8.4 Troubleshooting. Updated 10 Technical Specifications.
Issue 12 (2022-03-20)
Updated 2.3 Label Description. Updated 2.4.1 Appearance. Updated 4.3 Determining the Installation Position. Updated 6.1 Check Before Power-on. Updated 6.2 Powering On the SUN2000. Updated 8.3 Routine Maintenance. Updated 8.6 Resetting and Turning On the DC Switch. Updated A Grid Codes.
Issue 11 (2021-11-10)
Added the SUN2000-75KTL-M1 model. Updated About This Document. Updated 2.1 Product Model. Updated 2.4.1 Appearance. Updated 4.5 Installing a Solar Inverter. Updated 5.2 Preparing Cables. Updated 5.3 Connecting the PE Cable. Updated 5.6 Connecting an AC Output Power Cable.

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Updated 6.2 Powering On the SUN2000. Updated 10 Technical Specifications. Updated A Grid Codes.
Issue 10 (2021-09-28)
Updated 2.3 Label Description. Updated 2.4.1 Appearance. Updated 4.5 Installing a Solar Inverter. Updated 5.2 Preparing Cables. Updated 5.7.1 Cable Connection Description. Updated 6.2 Powering On the SUN2000. Updated 7.1.4.5 AFCI. Updated 8.1 Shutdown and Power-Off. Updated 8.2 Power-Off for Troubleshooting. Updated 8.3 Routine Maintenance. Updated 8.6 Resetting and Turning On the DC Switch.

Issue 09 (2021-07-08)
Updated 5.7.1 Cable Connection Description. Updated 6.2 Powering On the SUN2000.

Issue 08 (2021-03-10)
Updated 5.7.1 Cable Connection Description. Updated 8.4 Troubleshooting. Updated A Grid Codes.
Issue 07 (2020-09-15)
Updated 2.2 Overview. Updated 2.4.1 Appearance. Updated 6.2 Powering On the SUN2000. Updated 7.1 Operations with the SUN2000 App. Updated 8.3 Routine Maintenance. Updated 8.4 Troubleshooting.

Issue 06 (2020-08-10)
Updated 4.3 Determining the Installation Position.

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About This Document

Issue 05 (2020-03-30)
Updated 2.4.2 Indicator Status. Updated 10 Technical Specifications.
Issue 04 (2020-02-07)
Updated 5.7.1 Cable Connection Description.

Issue 03 (2019-12-08)
Updated 3 Solar Inverter Storage. Updated 4.5 Installing a Solar Inverter. Updated 5.2 Preparing Cables. Updated 5.6 Connecting an AC Output Power Cable. Updated 5.7.1 Cable Connection Description. Updated 5.8 Connecting the RS485 Communications Cables. Updated 7.1.1 App Introduction. Added 8.2 Power-Off for Troubleshooting. Updated 10 Technical Specifications. Updated A Grid Codes. Added B Domain Name List of Management Systems.
Issue 02 (2019-08-09)
Added the SUN2000-110KTL-M0, SUN2000-100KTL-M0, SUN2000-100KTL-M1, and SUN2000 -100KTL-INM0 models.

Issue 01 (2019-05-15)
This issue is used for first office application (FOA).

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Contents

About This Document…………………………………………………………………………………………………. ii
1 Safety Information…………………………………………………………………………………………………… 1
1.1 General Safety…………………………………………………………………………………………………………………………………………………….. 1 1.2 Personnel Requirements……………………………………………………………………………………………………………………………………. 2 1.3 Electrical Safety…………………………………………………………………………………………………………………………………………………… 3 1.4 Installation Environment Requirements………………………………………………………………………………………………………….. 4 1.5 Mechanical Safety………………………………………………………………………………………………………………………………………………. 4 1.6 Commissioning……………………………………………………………………………………………………………………………………………………. 6 1.7 Maintenance and Replacement…………………………………………………………………………………………………………………………6
2 Overview……………………………………………………………………………………………………………………7
2.1 Product Model…………………………………………………………………………………………………………………………………………………….. 7 2.2 Overview……………………………………………………………………………………………………………………………………………………………… 9 2.3 Label Description……………………………………………………………………………………………………………………………………………… 11 2.4 Product Appearance…………………………………………………………………………………………………………………………………………. 12 2.4.1 Appearance…………………………………………………………………………………………………………………………………………………….. 13 2.4.2 Indicator Status……………………………………………………………………………………………………………………………………………… 16 2.5 Working Principles……………………………………………………………………………………………………………………………………………. 18 2.5.1 Circuit Diagram……………………………………………………………………………………………………………………………………………… 19 2.5.2 Working Modes……………………………………………………………………………………………………………………………………………… 20
3 Solar Inverter Storage……………………………………………………………………………………………. 22
4 Installation………………………………………………………………………………………………………………24
4.1 Check Before Installation………………………………………………………………………………………………………………………………… 24 4.2 Tools…………………………………………………………………………………………………………………………………………………………………… 25 4.3 Determining the Installation Position……………………………………………………………………………………………………………. 27 4.4 Installing the Mounting Bracket…………………………………………………………………………………………………………………….. 31 4.4.1 Support-mounted Installation………………………………………………………………………………………………………………………31 4.4.2 Wall-mounted Installation…………………………………………………………………………………………………………………………… 32 4.5 Installing a Solar Inverter………………………………………………………………………………………………………………………………… 34
5 Electrical Connections……………………………………………………………………………………………. 38
5.1 Precautions………………………………………………………………………………………………………………………………………………………… 38 5.2 Preparing Cables………………………………………………………………………………………………………………………………………………. 38

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5.3 Connecting the PE Cable…………………………………………………………………………………………………………………………………. 48 5.4 Opening the Maintenance Compartment Door…………………………………………………………………………………………… 49 5.5 (Optional) Installing the Power Cable of the Tracking System…………………………………………………………………. 52 5.6 Connecting an AC Output Power Cable………………………………………………………………………………………………………… 53 5.7 Connecting DC Input Power Cables………………………………………………………………………………………………………………..59 5.7.1 Cable Connection Description……………………………………………………………………………………………………………………… 59 5.7.2 Connecting Cables to Amphenol Helios H4 Connectors…………………………………………………………………………..61 5.7.3 Connecting Cables to Staubli MC4 Connectors………………………………………………………………………………………… 64 5.8 Connecting the RS485 Communications Cables………………………………………………………………………………………….. 66
6 Commissioning……………………………………………………………………………………………………….. 69
6.1 Check Before Power-on…………………………………………………………………………………………………………………………………….69 6.2 Powering On the SUN2000…………………………………………………………………………………………………………………………….. 69
7 Man-Machine Interactions…………………………………………………………………………………….. 72
7.1 Operations with the SUN2000 App……………………………………………………………………………………………………………….. 72 7.1.1 App Introduction……………………………………………………………………………………………………………………………………………. 72 7.1.2 Downloading and Installing the App…………………………………………………………………………………………………………..73 7.1.3 Logging In to the App…………………………………………………………………………………………………………………………………… 74 7.1.4 Operations Related to the Advanced User………………………………………………………………………………………………… 79 7.1.4.1 Setting Grid Parameters……………………………………………………………………………………………………………………………..79 7.1.4.2 Setting Protection Parameters………………………………………………………………………………………………………………….. 80 7.1.4.3 Setting Feature Parameters………………………………………………………………………………………………………………………. 80 7.1.4.4 Built-in PID Recovery…………………………………………………………………………………………………………………………………. 84 7.1.4.5 AFCI………………………………………………………………………………………………………………………………………………………………. 86 7.1.5 Operations Related to the Special User………………………………………………………………………………………………………87 7.1.5.1 Setting Grid Parameters……………………………………………………………………………………………………………………………..87 7.1.5.2 Setting Protection Parameters………………………………………………………………………………………………………………….. 89 7.1.5.3 Setting Feature Parameters………………………………………………………………………………………………………………………. 91 7.1.5.4 Setting Power Adjustment Parameters…………………………………………………………………………………………………….95 7.2 (Optional) Installing a Smart Dongle…………………………………………………………………………………………………………. 100 7.3 Operations with a USB Flash Drive……………………………………………………………………………………………………………… 100 7.3.1 Exporting Configurations…………………………………………………………………………………………………………………………….101 7.3.2 Importing Configurations…………………………………………………………………………………………………………………………… 102 7.3.3 Exporting Data…………………………………………………………………………………………………………………………………………….. 103 7.3.4 Upgrading…………………………………………………………………………………………………………………………………………………….. 104
8 Maintenance………………………………………………………………………………………………………….106
8.1 Shutdown and Power-Off……………………………………………………………………………………………………………………………… 106 8.2 Power-Off for Troubleshooting……………………………………………………………………………………………………………………..107 8.3 Routine Maintenance…………………………………………………………………………………………………………………………………….. 108 8.4 Troubleshooting……………………………………………………………………………………………………………………………………………… 110 8.5 Replacing a Fan………………………………………………………………………………………………………………………………………………. 123 8.6 Resetting and Turning On the DC Switch…………………………………………………………………………………………………… 127

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Contents

9 Handling the Inverter………………………………………………………………………………………….. 128
9.1 Removing the SUN2000………………………………………………………………………………………………………………………………… 128 9.2 Packing the SUN2000……………………………………………………………………………………………………………………………………. 128 9.3 Disposing of the SUN2000……………………………………………………………………………………………………………………………. 128
10 Technical Specifications………………………………………………………………………………………129 A Grid Codes……………………………………………………………………………………………………………. 134 B Domain Name List of Management Systems………………………………………………………145 C Acronyms and Abbreviations………………………………………………………………………………. 146

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1 Safety Information

1.1 General Safety

Statement

Before installing, operating, and maintaining the equipment, read this document and observe all the safety instructions on the equipment and in this document.
The “NOTICE”, “CAUTION”, “WARNING”, and “DANGER” statements in this document do not cover all the safety instructions. They are only supplements to the safety instructions. Huawei will not be liable for any consequence caused by the violation of general safety requirements or design, production, and usage safety standards.
Ensure that the equipment is used in environments that meet its design specifications. Otherwise, the equipment may become faulty, and the resulting equipment malfunction, component damage, personal injuries, or property damage are not covered under the warranty.
Follow local laws and regulations when installing, operating, or maintaining the equipment. The safety instructions in this document are only supplements to local laws and regulations.
Huawei will not be liable for any consequences of the following circumstances:
Operation beyond the conditions specified in this document
Installation or use in environments which are not specified in relevant international or national standards
Unauthorized modifications to the product or software code or removal of the product
Failure to follow the operation instructions and safety precautions on the product and in this document
Equipment damage due to force majeure, such as earthquakes, fire, and storms
Damage caused during transportation by the customer
Storage conditions that do not meet the requirements specified in this document

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General Requirements

1 Safety Information

DANGER
Do not work with power on during installation.
Do not install, use, or operate outdoor equipment and cables (including but not limited to moving equipment, operating equipment and cables, inserting connectors to or removing connectors from signal ports connected to outdoor facilities, working at heights, and performing outdoor installation) in harsh weather conditions such as lightning, rain, snow, and level 6 or stronger wind.
After installing the equipment, remove idle packing materials such as cartons, foam, plastics, and cable ties from the equipment area.
In the case of a fire, immediately leave the building or the equipment area, and turn on the fire alarm bell or make an emergency call. Do not enter the building on fire in any case.
Do not scrawl, damage, or block any warning label on the equipment. Tighten the screws to the specified torque using tools when installing the
equipment. Understand the components and functioning of a grid-tied PV power system
and relevant local standards. Repaint any paint scratches caused during equipment transportation or
installation in a timely manner. Equipment with scratches cannot be exposed to an outdoor environment for a long period of time. Do not open the host panel of the equipment. You shall not reverse engineer, decompile, disassemble, adapt, add code to the device software or alter the device software in any other way, research the internal implementation of the device, obtain the device software source code, infringe on Huawei’s intellectual property, or disclose any device software performance test results.
Personal Safety
If there is a probability of personal injury or equipment damage during operations on the equipment, immediately stop the operations, report the case to the supervisor, and take feasible protective measures.
Use tools correctly to avoid hurting people or damaging the equipment. Do not touch the energized equipment, as the enclosure is hot.

1.2 Personnel Requirements
Personnel who plan to install or maintain Huawei equipment must receive thorough training, understand all necessary safety precautions, and be able to correctly perform all operations.
Only qualified professionals or trained personnel are allowed to install, operate, and maintain the equipment.
Only qualified professionals are allowed to remove safety facilities and inspect the equipment.

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1 Safety Information

Personnel who will operate the equipment, including operators, trained personnel, and professionals, should possess the local national required qualifications in special operations such as high-voltage operations, working at heights, and operations of special equipment.
Only professionals or authorized personnel are allowed to replace the equipment or components (including software).
NOTE
Professionals: personnel who are trained or experienced in equipment operations and are clear of the sources and degree of various potential hazards in equipment installation, operation, and maintenance
Trained personnel: personnel who are technically trained, have required experience, are aware of possible hazards on themselves in certain operations, and are able to take protective measures to minimize the hazards on themselves and other people
Operators: operation personnel who may come in contact with the equipment, except trained personnel and professionals

1.3 Electrical Safety

Grounding

For the equipment that needs to be grounded, install the ground cable first when installing the equipment and remove the ground cable last when removing the equipment.
Do not damage the ground conductor.
Do not operate the equipment in the absence of a properly installed ground conductor.
Ensure that the equipment is connected permanently to the protective ground. Before operating the equipment, check its electrical connection to ensure that it is securely grounded.

General Requirements

DANGER
Before connecting cables, ensure that the equipment is intact. Otherwise, electric shocks or fire may occur.
Ensure that all electrical connections comply with local electrical standards. Obtain approval from the local electric utility company before using the
equipment in grid-tied mode. Ensure that the cables you prepared meet local regulations. Use dedicated insulated tools when performing high-voltage operations.

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AC and DC Power

1 Safety Information

Cabling

DANGER
Do not connect or disconnect power cables with power on. Transient contact between the core of the power cable and the conductor will generate electric arcs or sparks, which may cause fire or personal injury.
Before making electrical connections, switch off the disconnector on the upstream device to cut off the power supply if people may contact energized components.
Before connecting a power cable, check that the label on the power cable is correct.
If the equipment has multiple inputs, disconnect all the inputs before operating the equipment.
When routing cables, ensure that a distance of at least 30 mm exists between the cables and heat-generating components or areas. This prevents damage to the insulation layer of the cables.
Bind cables of the same type together. When routing cables of different types, ensure that they are at least 30 mm away from each other.
Ensure that the cables used in a grid-tied PV power system are properly connected and insulated and meet specifications.

1.4 Installation Environment Requirements
Ensure that the equipment is installed in a well ventilated environment. To prevent fire due to high temperature, ensure that the ventilation vents or
heat dissipation system are not blocked when the equipment is running. Do not expose the equipment to flammable or explosive gas or smoke. Do
not perform any operation on the equipment in such environments.

1.5 Mechanical Safety

Using Ladders

Use wooden or fiberglass ladders when you need to perform live working at heights.
When a step ladder is used, ensure that the pull ropes are secured and the ladder is held firm.
Before using a ladder, check that it is intact and confirm its load bearing capacity. Do not overload it.
Ensure that the wider end of the ladder is at the bottom, or protective measures have been taken at the bottom to prevent the ladder from sliding.

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1 Safety Information

Ensure that the ladder is securely positioned. The recommended angle for a ladder against the floor is 75 degrees, as shown in the following figure. An angle rule can be used to measure the angle.

When climbing a ladder, take the following precautions to reduce risks and ensure safety: Keep your body steady. Do not climb higher than the fourth rung of the ladder from the top. Ensure that your body’s center of gravity does not shift outside the legs of the ladder.
Drilling Holes
When drilling holes into a wall or floor, observe the following safety precautions:
Wear goggles and protective gloves when drilling holes. When drilling holes, protect the equipment from shavings. After drilling, clean
up any shavings that have accumulated inside or outside the equipment.
Moving Heavy Objects
Be cautious to avoid injury when moving heavy objects.

When moving the equipment by hand, wear protective gloves to prevent injuries.

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1 Safety Information

1.6 Commissioning
When the equipment is powered on for the first time, ensure that professional personnel set parameters correctly. Incorrect settings may result in inconsistency with local certification and affect the normal operation of the equipment.
1.7 Maintenance and Replacement
DANGER
High voltage generated by the equipment during operation may cause an electric shock, which could result in death, serious injury, or serious property damage. Prior to maintenance, power off the equipment and strictly comply with the safety precautions in this document and relevant documents.
Maintain the equipment with sufficient knowledge of this document and using proper tools and testing equipment.
Before maintaining the equipment, power it off and follow the instructions on the delayed discharge label to ensure that the equipment is powered off.
Turn off the AC and DC switches of the SUN2000 when maintaining the electric equipment or power distribution equipment connected the SUN2000.
Place temporary warning signs or erect fences to prevent unauthorized access to the maintenance site.
If the equipment is faulty, contact your dealer. The equipment can be powered on only after all faults are rectified. Failing to
do so may escalate faults or damage the equipment.

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2 Overview

2 Overview
2.1 Product Model
Model Description
NOTICE The SUN2000-125KTL-M0, SUN2000-110KTL-M0, and SUN2000-100KTL-M0 are applicable only to the Chinese mainland. For other countries or regions, Huawei does not provide quality assurance.
This document covers the following product models: SUN2000-125KTL-M0 SUN2000-110KTL-M0 SUN2000-100KTL-M0 SUN2000-100KTL-M1 SUN2000-100KTL-INM0 SUN2000-75KTL-M1
Figure 2-1 Model

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2 Overview

Table 2-1 Model description

No.

Description

Value

1

Product family SUN2000: grid-tied solar inverter

2

Power

125K: The power level is 125 kW. 110K: The power level is 110 kW. 100K: The power level is 100 kW. 75K: The power level is 75 kW.

3

Topology

TL: transformerless

4

Region

IN: India

5

Design code

M0 and M1: product series with an input voltage

level of 1100 V DC1

Model Identification
You can obtain the solar inverter model from the model label on the external package and the nameplate on the side of the enclosure.
Figure 2-2 Position of the model label on the external package

(1) Position of the model label

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Figure 2-3 Nameplate

2 Overview

(1) Trademark and product model (3) Compliance symbols

(2) Key technical specifications (4) Company name and country of origin

NOTE The nameplate figure is for reference only.

2.2 Overview

Description

SUN2000 solar inverters are grid-tied PV string inverters that convert the DC power generated by PV strings into AC power and feed the power into the power grid.

Characteristics
Smart
Ten independent maximum power point tracking (MPPT) circuits and 20 PV string inputs. Flexible configuration of PV strings is supported.
Smart PV module self-learning: Automatically detects PV module failures, helping rectify faults. Optimizes the working mode to obtain the optimal working mode of the system.
Smart air cooling: Adjusts the fan speed based on the ambient temperature and load to ensure the service life of fans and avoid frequent maintenance.

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MBUS networking: Uses the existing power line for communication and does not require additional communications cable, which reduces the construction and maintenance costs and improves communication reliability and efficiency.
Smart I-V curve diagnosis: Implements I-V scanning and health diagnosis for PV strings. In this way, potential risks and faults can be detected in time, improving the plant operation & maintenance (O&M) quality.
Safe
Embedded DC and AC surge protection devices (SPDs): all-dimensional surge protection
Embedded residual current monitoring unit: Immediately disconnects from the power grid upon detecting that the residual current exceeds the threshold.

Networking
SUN2000 solar inverters apply to grid-tied systems of large-scale PV plants and commercial distributed grid-tied systems. Typically, a grid-tied PV system consists of the PV string, solar inverter, AC combiner box, and transformer station.

Figure 2-4 Networking

(1) PV string (4) Transformer station

(2) SUN2000 (5) Power grid

(3) AC combiner box –

NOTE
Connect the SUN2000-125KTL-M0 to a dedicated power transformer instead of a lowvoltage overhead power cable.
In a non-low-voltage grid-connected scenario, the SUN2000-100KTL-M1, SUN2000 -100KTL-INM0, and SUN2000-75KTL-M1 need to connect to an isolation transformer and avoid overhead cabling.
Supported Power Grids
SUN2000-110KTL-M0, SUN2000-100KTL-M0, SUN2000-100KTL-M1, SUN2000-100KTL-INM0, and SUN2000-75KTL-M1 solar inverters support the TN-S, TN-C, TN-C-S, TT, and IT power grids.
The SUN2000-125KTL-M0 supports only the IT power grid.

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Figure 2-5 Supported power grids

2 Overview

2.3 Label Description

Symbol

Name Running warning Burn warning Large current warning Delayed discharge
Refer to documentation

Meaning
Potential hazards exist after the inverter is powered on. Take protective measures when operating the inverter.
Do not touch a running inverter, as the shell becomes hot during operation.
Before powering on the inverter, ensure that the inverter is grounded because there is a large contact current after the inverter is powered on.
High voltage exists after the inverter is powered on. Only qualified and trained electrical technicians are allowed to perform operations on the inverter.
Residual voltage exists after the inverter is powered off. It takes 15 minutes for the inverter to discharge to the safe voltage.
Reminds operators to refer to the documents shipped with the inverter.

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Symbol

Name Grounding

2 Overview
Meaning Indicates the position for connecting the protective earthing (PE) cable.

Operation warning
Switching operation warning

Do not remove the DC input connector when the inverter is running.
The DC switch may fail to switch off automatically when it is not completely closed.

Switch unloaded warning This position indicates that the DC switch is in unloaded state. Do not set the DC switch to this position.

Fan operation warning

High voltage exists after the inverter is powered on. Do not touch the fans when the inverter is working.

Fan replacement warning Before replacing a fan, disconnect its power connectors.

Inverter ESN label Weight label

Indicates the inverter serial number.
The inverter needs to be carried by four persons or using a pallet truck.

2.4 Product Appearance

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2.4.1 Appearance
Front View
Figure 2-6 Front view

2 Overview

(1) Panel (3) Maintenance compartment door (5) External fan tray

(2) LED indicators (4) Mounting bracket –

Bottom View

NOTE
The DC switch of the current model can be manual or automatic. According to Australian standards, the screws for DC switches are delivered with
SUN2000s. The screws are used to secure DC switches (DC SWITCH 1, DC SWITCH 2, and DC SWITCH 3) to prevent them from being turned on by mistake.

Figure 2-7 Port description (manual DC switch)

(1) DC input terminal group 1 (PV1PV8, controlled by DC SWITCH 1) (3) DC switch 1 (DC SWITCH 1)
(5) (Optional) Screw hole for DC switch 2 (7) DC input terminal group 3 (PV15PV20, controlled by DC SWITCH 3)

(2) (Optional) Screw hole for DC switch 1
(4) DC input terminal group 2 (PV9PV14, controlled by DC SWITCH 2) (6) DC switch 2 (DC SWITCH 2) (8) (Optional) Screw hole for DC switch 3

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(9) DC switch 3 (DC SWITCH 3) (11) USB port (13) Hole for the AC output power cable

2 Overview
(10) Ventilation valve (12) Communications port (COM) (14) Hole for the tracking system power cable

Figure 2-8 Port description (automatic DC switch)

(1) DC input terminal group 1 (PV1PV8, controlled by DC SWITCH 1)

(2) (Optional) Screw hole for DC switch 1

(3) DC switch 1 (DC SWITCH 1)

(4) Reset button 1 (RESET 1)

(5) DC input terminal group 2 (PV9PV14, controlled by DC SWITCH 2)

(6) (Optional) Screw hole for DC switch 2

(7) DC switch 2 (DC SWITCH 2)

(8) Reset button 2 (RESET 2)

(9) DC input terminal group 3 (PV15PV20, controlled by DC SWITCH 3)

(10) (Optional) Screw hole for DC switch 3

(11) DC switch 3 (DC SWITCH 3)

(12) Reset button 3 (RESET 3)

(13) Ventilation valve

(14) USB port

(15) Communications port (COM)

(16) Hole for the AC output power cable

(17) Hole for the tracking system power cable –

DC Switch Description

DANGER
The DC switches automatically turn off when a fault occurs in the inverters (LED4 is steady red, and the three DC switches are OFF). In this case, contact your technical support. Do not turn on the DC switches by yourself.

Table 2-2 DC switch description

Switch Component

Description

DC SWITCH

ON The DC switch is ON and can automatically turn off for protection.

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Switch Component
RESET

Description

The DC switch is ON but cannot automatically turn off for protection.

OFF The DC switch is OFF.

When the DC switch automatically turns off for protection, the RESET button will be released.

When the RESET button is not pressed, the DC switch can

only be turned to the unloaded position be set to the ON position.

, and cannot

Dimensions
Figure 2-9 Dimensions

Wiring Area
Figure 2-10 Wiring port of a 3-pin model (SUN2000-125KTL-M0)

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(1) DC input terminals (3) Ground point on the enclosure

(2) RS485 port (4) AC terminal block (3-pin)

Figure 2-11 Wiring port of 4-pin models (SUN2000-110KTL-M0, SUN2000-100KTL-M0, SUN2000-100KTL-M1, SUN2000-100KTL-INM0 and SUN2000-75KTL-M1)

(1) DC input terminals (3) Ground point on the enclosure
2.4.2 Indicator Status
Figure 2-12 Indicator

(2) RS485 port (4) AC terminal block (4-pin)

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No. Indicator

1

PV connection

indicator

2

Grid connection

indicator

3

Communications

indicator

Status (Blinking Fast: On for 0.2s and then Off for 0.2s; Blinking Slowly: On for 1s and then Off for 1s) Steady green
Blinking green fast
Off
Steady green Blinking green fast
Off Blinking green fast Off

Description
At least one PV string is properly connected, and the DC input voltage of the corresponding MPPT circuit is at least 200 V.
If the alarm/maintenance indicator is red, an environmental fault at the DC side of the solar inverter is generated.
The solar inverter disconnects from all PV strings, or the DC input voltage of all MPPT circuits is less than 200 V.
The solar inverter is in gridtied mode.
If the alarm/maintenance indicator is red, an environmental fault at the AC side of the solar inverter is generated.
The solar inverter is not in grid-tied mode.
The solar inverter receives communication data normally.
The solar inverter has not received communication data for 10 seconds.

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No. Indicator

4

Alarm/

Maintenance

indicator

Status (Blinking Fast: On for 0.2s and then Off for 0.2s; Blinking Slowly: On for 1s and then Off for 1s)

Alarm status

Steady red

Local maintenance status

Blinking red fast
Blinking red slowly
Steady green
Blinking green fast
Blinking green slowly

Description
A major alarm is generated. If the PV connection
indicator or grid connection indicator is blinking green fast, troubleshoot DC or AC environmental faults as instructed by the SUN2000 app. If the PV connection indicator and grid connection indicator are both not blinking green fast, replace components or the solar inverter as instructed by the SUN2000 app.
A minor alarm is generated.
A warning alarm is generated.
Local maintenance succeeds.
Local maintenance fails.
In local maintenance or shuts down over a command.

NOTE
The PV connection indicator and the grid connection indicator preferentially indicate environmental faults.
Local maintenance refers to operations performed after a USB flash drive, a WLAN module, a Bluetooth module, or a USB data cable is inserted into the USB port of the solar inverter. For example, local maintenance includes data import and export using a USB flash drive, and connecting to the SUN2000 app over a WLAN module, a Bluetooth module, or a USB data cable.
If an alarm is generated during local maintenance, the alarm/maintenance indicator shows the local maintenance state first. After the USB flash drive, WLAN module, Bluetooth module, or USB data cable is removed, the indicator shows the alarm state.
2.5 Working Principles

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2.5.1 Circuit Diagram
The solar inverter receives inputs from 20 PV strings. The inputs are grouped into 10 MPPT circuits inside the solar inverter to track the maximum power point of the PV strings. The DC power is then converted into three-phase AC power through an inverter circuit. Surge protection is supported on both the DC and AC sides.
Figure 2-13 Schematic diagram of a 3-pin model

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Figure 2-14 Schematic diagram of 4-pin models

2 Overview

2.5.2 Working Modes
The SUN2000 can work in Standby, Operating, or Shutdown mode.

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Figure 2-15 Working modes

2 Overview

Table 2-3 Working mode description

Working Mode

Description

Standby

The SUN2000 enters Standby mode when the external environment does not meet the operating requirements. In Standby mode:
The SUN2000 continuously performs status check and enters the Operating mode once the operating requirements are met.
The SUN2000 enters Shutdown mode after detecting a shutdown command or a fault after startup.

Operating

In Operating mode:
The SUN2000 converts DC power from PV strings into AC power and feeds the power to the power grid.
The SUN2000 tracks the maximum power point to maximize the PV string output.
If the SUN2000 detects a fault or a shutdown command, it enters the Shutdown mode.
The SUN2000 enters Standby mode after detecting that the PV string output power is not suitable for connecting to the power grid for generating power.

Shutdown

In Standby or Operating mode, the SUN2000 enters Shutdown mode after detecting a fault or shutdown command.
In Shutdown mode, the SUN2000 enters Standby mode after detecting a startup command or that the fault is rectified.

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3 Solar Inverter Storage
The following requirements should be met if the solar inverter is not put into use immediately: Do not remove the packing materials, and check the packing materials
regularly (recommended: every three months). If any rodent bites are found, replace the packing materials immediately. If the solar inverter is unpacked but not put into use immediately, put it inside the original package with the desiccant bag, and seal it using tape. The ambient temperature and humidity should be suitable for the storage. The air must not contain corrosive or flammable gases.
Figure 3-1 Storage temperature and humidity

The solar inverter should be stored in a clean and dry place and be protected from dust and water vapor corrosion. The solar inverter must be protected against rain and water.
Do not tilt the package or place it upside down.
To avoid personal injury or device damage, stack inverters with caution to prevent them from falling over.

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Figure 3-2 Maximum number of pile-up layers allowed

If the solar inverter has been stored for more than two years, it must be checked and tested by professionals before being put into use.

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4 Installation
4.1 Check Before Installation
Checking Outer Packing Materials
Before unpacking the solar inverter, check the outer packing materials for damage, such as holes and cracks, and check the solar inverter model. If any damage is found or the solar inverter model is not what you requested, do not unpack the package and contact your supplier as soon as possible.
NOTE You are advised to remove the packing materials within 24 hours before installing the solar inverter.
Checking Accessories
After unpacking the solar inverter, check that the components are intact and complete. If any damage is found or any component is missing, contact your dealer.
NOTE For details about the number of accessories delivered with the solar inverter, see the Packing List in the packing case.

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4.2 Tools

Category

Tool

4 Installation

Hammer drill (with 14 mm and 16 mm drill bits)

Socket wrench set

Torque wrench

Torque screwdriver (Phillips head: M3 and M4; flat head: M3 and M4)

Installation tools Diagonal pliers

Wire strippers

Flat-head screwdriver (head: M3)

Rubber mallet

Utility knife

Cable cutter

Crimping tool
Model: H4TC0003
Manufacturer: AMPHENOL
(For Amphenol Helios H4 connectors only)

Crimping tool
Model: PVCZM-22100
Manufacturer: STAUBIL
(For Staubli MC4 connectors only)

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Category

Tool

4 Installation

Open-end wrench
Model: H4TW0001
Manufacturer: AMPHENOL
(For Amphenol Helios H4 connectors only)

Open-end wrench
Model: PV-MSHZ
Manufacturer: STAUBIL
(For Staubli MC4 connectors only)

Multimeter (DC voltage measurement range 1100 V DC)

Marker

Measuring tape

Bubble or digital Hydraulic pliers level

Heat shrink tubing

Heat gun

Cable tie –

Scissors –

RJ45 crimping tool
–

Vacuum cleaner

Personal protective equipment (PPE)
Safety gloves

Safety goggles Dust mask

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4 Installation

4.3 Determining the Installation Position

Installation Environment Requirements
Do not install the inverter in working or living areas.
If the device is installed in public places (such as parking lots, stations, and factories) other than working and living areas, install a protective net outside the device, set up a safety warning sign to isolate the device, and prevent unauthorized personnel from approaching the inverter. This is to avoid personal injury or property loss caused by accidental contact or other reasons during device operation.
If inverters are installed in a place with abundant vegetation, in addition to routine weeding, harden the ground underneath the inverters using cement or gravel (recommended area: 3 m x 2.5 m).
Do not install the inverter in areas with flammable materials.
Do not install the inverter in areas with explosive materials.
Do not install the inverter in areas with corrosive materials.
Do not install the inverter where its enclosure and heat sinks are easily accessible, because the voltage is high and these parts are hot during operation.
Install the inverter in a well-ventilated environment for heat dissipation
If the inverter is installed in an airtight environment, a heat dissipation device or ventilation device must be installed to ensure that the indoor ambient temperature is not higher than the external ambient temperature during operation.
You are advised to install the inverter in a sheltered place or install an awning over it.
The inverter will be corroded in salt areas. Before installing the inverter outdoors in salt areas, consult Huawei. A salt area refers to the region within 500 meters from the coast or prone to sea breeze. The regions prone to sea breeze vary with weather conditions (such as typhoons and monsoons) or terrains (such as dams and hills).
NOTE
The SUN2000-125KTL-M0 should be physically separated from third-party wireless communication facilities and residential environments by distance greater than 30 m.

Mounting Structure Requirements
The mounting structure where the solar inverter is installed must be fire resistant. Do not install the solar inverter on flammable building materials.
Ensure that the installation surface is solid enough to bear the solar inverter.
In residential areas, do not install the solar inverter on drywalls or walls made of similar materials with a weak sound insulation performance because the noise generated by the solar inverter may interfere with residents.

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Figure 4-1 Mounting structure

4 Installation

Installation Angle Requirements
The solar inverter can be support-mounted or wall-mounted. The installation angle requirements are as follows:
Install the solar inverter vertically or at a maximum back tilt of 75 degrees to facilitate heat dissipation.
Do not install the solar inverter at forward tilted, excessive back tilted, side tilted, horizontal, or upside down positions.
Figure 4-2 Angle

Installation Dimensions Requirements
Reserve enough space around the solar inverter for installation and heat dissipation.

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Figure 4-3 Installation clearance

4 Installation

NOTE
For ease of installing the solar inverter on the mounting bracket, connecting cables to the bottom of the solar inverter, and maintaining the solar inverter in future, it is recommended that the bottom clearance be between 600 mm and 730 mm. If you have any question about the clearance, consult the local technical support engineers.
When installing multiple solar inverters, install them in horizontal mode if sufficient space is available and install them in triangle mode if no sufficient space is available. Stacked installation is not recommended.
Figure 4-4 Horizontal installation mode (recommended)

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Figure 4-5 Triangle installation mode (recommended)

4 Installation

Figure 4-6 Stacked installation mode (not recommended)

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4.4 Installing the Mounting Bracket
Before installing the mounting bracket, remove the security Torx wrench and keep it for later use.
Figure 4-7 Position for binding the security Torx wrench

(1) Security Torx wrench
The mounting bracket of the solar inverter has four groups of tapped holes, each group containing four tapped holes. Mark any hole in each group based on site requirements and mark four holes in total. The two round holes are recommended.
Figure 4-8 Hole dimensions

4.4.1 Support-mounted Installation

Prerequisites
M12x40 bolt assemblies are supplied with the mounting bracket. If the bolt length does not meet the installation requirements, prepare M12 bolt assemblies by yourself and use them together with the supplied M12 nuts.

Procedure
Step 1 Determine the positions for drilling holes using the mounting bracket. Level the positions of mounting holes using a bubble or digital level, and mark the positions with a marker.

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Step 2 Drill holes using a hammer drill. It is recommended that anti-rust measures be taken on the positions for drilling holes.
Step 3 Secure the mounting bracket.

Figure 4-9 Installing the mounting bracket

—-End
4.4.2 Wall-mounted Installation
Prerequisites
You have prepared expansion bolts. M12x60 stainless steel expansion bolts are recommended.
Procedure
Step 1 Determine the positions for drilling holes using the mounting bracket. Level the positions of mounting holes using a bubble or digital level, and mark the positions with a marker.
Step 2 Drill holes using a hammer drill and install expansion bolts.
WARNING Avoid drilling holes in the position of the wall with water pipes and power cables buried inside.

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NOTICE
To prevent dust inhalation or contact with eyes, wear safety goggles and an anti-dust respirator when drilling holes.
Clean up any dust in and around the holes using a vacuum cleaner and measure the distance between holes. If the holes are inaccurately positioned, drill a new set of holes.
Level the head of the expansion sleeve with the concrete wall after removing the bolt, spring washer, and flat washer. Otherwise, the mounting bracket will not be securely installed on the wall.
Step 3 Secure the mounting bracket.
Figure 4-10 Installing the mounting bracket

—-End

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4.5 Installing a Solar Inverter
Context
NOTICE
Move the solar inverter with care to prevent device damage and personal injury.
It takes multiple persons or a pallet truck to move the solar inverter. Do not use the ports and wiring terminals at the bottom to support any weight
of the solar inverter. When you need to temporally place the solar inverter on the ground, use foam,
paper, or other protection material to prevent damage to its cover. Use lifting handles to facilitate installation, which are optional and delivered
separately. Ensure that the lifting handles are securely installed. After the installation is complete, remove the lifting handles and keep them properly. To avoid damage to the equipment, do not lift or hoist a solar inverter with an improper hold as shown in Figure 4-12.
Figure 4-11 Positions for installing the lifting handles

(A) Transportation scenario
Figure 4-12 Lifting positions

(B) Installation scenario

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Procedure
Step 1 Lift the solar inverter from the packing case and move it to the installation position.

Figure 4-13 Taking out the solar inverter

Step 2 (Optional) Install screws for locking DC switches. NOTE
For the model used in Australia, perform this step to meet the local standards
Figure 4-14 Install screws for locking DC switches

Step 3 Lift the solar inverter and keep it upright.

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Figure 4-15 Lifting the solar inverter and keeping it upright

4 Installation

Step 4 If the installation position is too high to install the solar inverter on the mounting bracket, run a rope that is strong enough to bear the solar inverter through the two lifting eyes, and hoist the solar inverter.
NOTICE Hoist the solar inverter with care to protect it from colliding with the wall or other objects.
Figure 4-16 Hoisting the solar inverter

Step 5 Install the solar inverter on the mounting bracket and align the solar inverter enclosure with the mounting bracket.

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Figure 4-17 Mounting the solar inverter

4 Installation

Step 6 Secure the solar inverter. Figure 4-18 Tightening security Torx screws
—-End

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5 Electrical Connections

5.1 Precautions

DANGER
After the PV array receives solar irradiance, it transmits the DC voltage to the solar inverter. Before connecting cables, ensure that the three DC switches on the solar inverter are set to OFF. Otherwise, the high voltage of the solar inverter may result in electric shocks.

WARNING
The device damage caused by incorrect cable connections is beyond the warranty scope.
Only qualified technicians can perform operations about electrical connection. Wear proper PPE at all time when connecting cables. To prevent poor cable connection due to overstress, leave enough slack before
connecting the cables to the appropriate ports.

NOTE
The cable colors shown in the electrical connection diagrams provided in this chapter are for reference only. Select cables in accordance with local cable specifications (green-andyellow cables are only used for protective earthing).

5.2 Preparing Cables
SUN2000 solar inverters support RS485 communication and MBUS communication.

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NOTICE
The MBUS communication is applicable to medium-voltage grid connection scenarios and non-low-voltage public grid connection scenarios (industrial environment).

NOTE

In the networking diagram, indicates the power cable,

direction, and and

indicate the signal flow.

indicates the power flow

Figure 5-1 RS485 networking (SmartLogger)

(A) PV string (D) Transformer station (G) Management system

(B) SUN2000 (E) Power grid –

(C) AC combiner box (F) SmartLogger –

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Figure 5-2 RS485 networking (SDongle)

5 Electrical Connections

(A) PV string (D) Transformer station (G) Management system

(B) SUN2000 (E) Power grid –

Figure 5-3 MBUS networking (SmartLogger)

(C) AC combiner box (F) SDongle –

(A) PV string (D) Transformer station (G) Management system

(B) SUN2000 (E) Power grid –

(C) AC combiner box (F) SmartLogger –

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Figure 5-4 MBUS networking (SDongle)

5 Electrical Connections

(A) PV string (D) Transformer station (G) Management system

(B) SUN2000 (E) Power grid –

(C) AC combiner box (F) SDongle –

NOTICE
To ensure the system response speed, it is recommended that less than 30 solar inverters be connected to each COM port on the SmartLogger and that less than 10 solar inverters be cascaded over the SDongle.
The RS485 communication distance between the last solar inverter and the SmartLogger cannot exceed 1000 m.

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Figure 5-5 Cable connections (configure the components in the dotted box as required)

Table 5-1 Components

No.

Component

A

PV string

B

Environmental

monitoring instrument

(EMI)

C

SmartLogger

Description

Source

PV strings consist of PV modules in series.
A solar inverter supports 20 PV string inputs.

Prepared by the customer

When the SmartLogger is used, the EMI can be directly connected to the SmartLogger or connected to the last solar inverter cascaded over RS485.
When the SDongle is used, the EMI is a cascaded device that needs to be connected to the solar inverter where the SDongle is installed.

Prepared by the customer

The solar inverter communicates with the management system through the SmartLogger.

Purchased from Huawei

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No.

Component

Description

Source

D

Power Meter

Implements power control at the gridtied point in low voltage scenarios using a power meter.

Prepared by the customer

E

Support tracking system Adjusts the angle of the supports.

Prepared by the

customer

F

Fuse/Circuit breaker

The tracking system should be

Prepared by the

equipped with an overcurrent

customer

protection device or component. The

power cable between the device or

component and the wiring terminal

should be no longer than 2.5 m.

Therefore, a fuse or a circuit breaker is recommended.

Installed between the solar inverter and tracking control box

Fuse specifications: rated voltage 500 V; rated current: 16 A; protection: gG

Circuit breaker specifications: rated voltage 500 V; rated current: 16 A; tripping: C

G

AC switch

Installed in the AC combiner box
Recommended: a three-phase AC circuit breaker with a rated voltage greater than or equal to 500 V AC and a rated current of 250 A

Prepared by the customer

H

SDongle

The solar inverter communicates with the management system through the SDongle.

Purchased from Huawei

NOTICE
The solar inverter has an RCMU inside. Its external AC switch should be a threephase circuit breaker or other AC load circuit breakers to safely disconnect the solar inverter from the power grid.
NOTE
The cable diameter must comply with local cable standards. The factors that affect cable selection include the rated current, cable type, routing
mode, ambient temperature, and maximum expected line loss.

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Table 5-2 Cable description of a 3-pin model (S: cross-sectional area of the AC cable conductor; Sp: cross-sectional area of the protective earthing cable conductor)

No. Cable

Category

Conductor Cross-Sectional Area Range

Outer Diameter

Source

1

DC input

PV cable that meets the 46 mm2

power cable 1100 V standard

5.59 mm

Prepared by the customer

2

RS485

Outdoor shielded twisted 0.251 mm2

communicatio pair that meets the local

ns cable

standard

One or two commu nication s cables: 411 mm
Three commu nication s cables: 48 mm

Prepared by the customer

3

Protective

Single-core outdoor

Sp S/2

earthing (PE) copper cable and M10

cable[1]

OT/DT terminals

N/A

Prepared by

the

customer

4

Tracking

Three-core outdoor

10 mm2

system power copper cable with dual-

cable

layer protection

1518 mm

Prepared by the customer

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No. Cable

Category

Conductor Cross-Sectional Area Range

Outer Diameter

Source

5

AC output

If you connect a PE

Copper cable: 2466 mm Prepared by

power cable (multi-core)

cable to the ground point on the enclosure, you are advised to use a three- core (L1, L2,

S: 70240 mm2
Sp S/2

the customer

and L3) outdoor cable and M12 OT/DT terminals (L1, L2, and L3).

Aluminum alloy cable or copper-clad aluminum

If you connect a PE

cable:

cable to the ground point in the maintenance compartment, you are

S: 95240 mm2
Sp S/2

advised to use a four-

core (L1, L2, L3, and

PE) outdoor cable,

M12 OT/DT terminals

(L1, L2, and L3), and

M10 OT/DT terminals

(PE). You do not need

to prepare a PE cable.

AC output power cable (single-core)[2]

You are advised to use a single-core outdoor cable and M12 OT/DT terminals.

Copper cable:
S: 70240 mm2
Aluminum alloy cable or copper-clad aluminum cable:
S: 95240 mm2

1432 mm

Prepared by the customer

Note [1]: The value of Sp is valid only if the conductors of the PE cable and AC power cable use the same material. If the materials are different, ensure that the conductor of the PE cable with a proper cross-sectional area produces a conductance equivalent to that of the cable specified in the table. The specifications of the PE cable are subject to this table or calculated according to IEC 60364-5-54.
Note [2]: For some models, the outer diameter of a single-core cable ranges from 14 mm to 36 mm based on the label in the maintenance compartment.

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Table 5-3 Cable description of 4-pin models (S: cross-sectional area of the AC cable conductor; Sp: cross-sectional area of the PE cable conductor)

No. Cable

Category

Conductor

Outer

Cross-Sectional Diameter

Area Range

Source

1

DC input power PV cable that meets the

cable

1100 V standard

46 mm2

5.59 mm

Prepared by the customer

2

RS485

Outdoor shielded twisted

0.251 mm2

communications pair that meets the local

cable

standard

One or two commu nicatio ns cables: 411 mm
Three commu nicatio ns cables: 48 mm

Prepared by the customer

3

PE cable[1]

Single-core outdoor copper cable and M10 OT/DT terminals

Sp S/2

N/A

Prepared

by the

customer

4

Tracking system Three-core outdoor copper 10 mm2

power cable

cable with dual-layer

protection

1518 mm Prepared by the customer

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No. Cable

5

AC output

power cable

(multi-core)

Category

Conductor

Outer

Cross-Sectional Diameter

Area Range

Source

If you connect a PE cable to the ground point on the enclosure and the neutral wire is not used, you are advised to use a three-core (L1, L2, and L3) outdoor cable and M12 OT/DT terminals (L1, L2, and L3).
If you connect a PE cable to the ground point in the maintenance compartment and the neutral wire is not used, you are advised to use a four-core (L1, L2, L3, and PE) outdoor cable, M12 OT/DT terminals (L1, L2, and L3), and M10 OT/DT terminals (PE).
If you connect a PE cable to the ground point on the enclosure and the neutral wire is used, you are advised to use a fourcore (L1, L2, L3, and N) outdoor cable and M12 OT/DT terminals (L1, L2, L3, and N).
If you connect a PE cable to the ground point in the maintenance compartment and the neutral wire is used, you are advised to use a fivecore (L1, L2, L3, N, and PE) outdoor cable, M12 OT/DT terminals (L1, L2, L3, and N), and M10 OT/DT terminals (PE).

Copper cable:
S: 70240 mm2
Sp S/2
Aluminum alloy cable or copperclad aluminum cable:
S: 95240 mm2
Sp S/2

2466 mm Prepared by the customer

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No. Cable

Category

Conductor

Outer

Cross-Sectional Diameter

Area Range

Source

AC output power cable (single-core)

You are advised to use a single-core outdoor cable and M12 OT/DT terminals.

Copper cable:
S: 70240 mm2
Aluminum alloy cable or copperclad aluminum cable:
S: 95240 mm2

1432 mm Prepared by the customer

Note [1]: The value of Sp is valid only if the conductors of the PE cable and AC power cable use the same material. If the materials are different, ensure that the conductor of the PE cable with a proper cross-sectional area produces a conductance equivalent to that of the cable specified in the table. The specifications of the PE cable are subject to this table or calculated according to IEC 60364-5-54.

5.3 Connecting the PE Cable
Context
NOTICE
Proper grounding is helpful for resisting the impact of surge voltage and improving the electromagnetic interference (EMI) performance. Before connecting the AC power cable, DC power cables, and communications cable, connect the PE cable to the PE point.
You are advised to choose the ground point on the enclosure. The ground point in the maintenance compartment is used for connecting to the PE cable contained in the multi-core AC power cable.
It is recommended that the PE cable of the solar inverter be connected to a nearby ground point. Connect the PE points of all solar inverters in the same array to ensure equipotential connections to PE cables.
Procedure
Step 1 Connect the PE cable to the PE point.

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Figure 5-6 Connecting the PE cable to the PE point (on the enclosure)

(1) Reserved PE point
—-End
Follow-up Procedure
To enhance the corrosion resistance of a ground terminal, apply silica gel or paint on it after connecting the PE cable.
5.4 Opening the Maintenance Compartment Door
Precautions
CAUTION Do not open the panel of the solar inverter. Before opening the maintenance compartment door, ensure that no electrical
connections are made for the solar inverter on the AC or DC side. If you need to open the maintenance compartment door in rainy or snowy
days, take protective measures to prevent rain or snow from entering the maintenance compartment. If unavoidable, do not open the maintenance compartment door. Do not leave unused screws in the maintenance compartment.
Procedure
Step 1 Open the maintenance compartment door and install the support bar.

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Figure 5-7 Opening the maintenance compartment door

Step 2 Remove the accessories and keep them properly. Figure 5-8 Removing the accessories

Step 3 Select a crimping module according to the type of the AC output power cable.

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Figure 5-9 Select the crimping module

5 Electrical Connections

(A) Crimping module (B) Crimping module

for multi-core cables of for single-core cables

a 3-pin model

of a 3-pin model

(C) Crimping module (D) Crimping module

for multi-core cables of for single-core cables

4-pin models

of 4-pin models

—-End

Follow-up Procedure
Use scissors to cut off the joints of the rubber rings to remove them. All rubber rings are removed in the same way.

NOTICE Remove the corresponding rubber rings in strict accordance with the cable diameter, and ensure that the crimping module is not damaged. Otherwise the protection level of the solar inverter will be affected.
Figure 5-10 Remove the rubber ring

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5.5 (Optional) Installing the Power Cable of the Tracking System
Precautions
WARNING
The tracking system obtains power from the AC three-phase power grid. The rated voltage of the power supply is the rated output voltage of the solar inverter.
Keep flammable materials away from the power cable. The power cable must be protected with a conduit to prevent short circuits
caused by insulation layer damage. Connect the power cable of the tracking system before the AC output power
cable. Otherwise, reworking will be caused.
Procedure
Step 1 Prepare a cable. Step 2 Remove the corresponding rubber rings. Step 3 Connect the power cable of the tracking system.
Figure 5-11 Connecting the power cable of the tracking system

—-End

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5.6 Connecting an AC Output Power Cable

Prerequisites

A three-phase AC switch should be installed on the AC side of the solar inverter. To ensure that the solar inverter can safely disconnect itself from the power grid when an exception occurs, select a proper overcurrent protection device in compliance with local power distribution regulations.
Connect the AC output power cable according to the requirements specified by local power grid operators.
Connect the power cable of the tracking system before the AC output power cable. Otherwise, reworking will be caused.

Figure 5-12 Cable connection sequence

(1) Power cable of the tracking system

(2) AC output power cable

WARNING Do not connect loads between the solar inverter and the AC switch.

Requirements for the OT/DT Terminal
If a copper cable is used, use copper wiring terminals.
If a copper-clad aluminum cable is used, use copper wiring terminals.
If an aluminum alloy cable is used, use copper-aluminum transition wiring terminals, or aluminum wiring terminals along with copper-aluminum transition spacers.

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NOTICE
Do not connect aluminum wiring terminals to the AC terminal block. Otherwise the electrochemical corrosion will occur and affect the reliability of cable connections.
Comply with the IEC61238-1 requirements when using copper-aluminum transition wiring terminals, or aluminum wiring terminals along with copperaluminum transition spacers.
If copper-aluminum transition spacers are used, pay attention to the front and rear sides. Ensure that the aluminum sides of spacers are in contact with aluminum wiring terminals, and copper sides of spacers are in contact with the AC terminal block.

Figure 5-13 Requirements for the OT/DT terminal

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Figure 5-14 AC terminal block dimensions of a 3-pin model

Figure 5-15 AC terminal block dimensions of 4-pin models

NOTE This section describes how to install an AC output power cable for the 3-pin model.
Procedure
Step 1 Prepare a cable. Step 2 Remove rubber rings according to the cable diameter range. Step 3 Secure the AC output power cable and PE cable. Step 4 Install the support bar. Step 5 Close the maintenance compartment door and tighten the two screws on the
door.

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NOTICE
Sufficient slack should be provided in the PE cable to ensure that the last cable bearing the force is the PE cable when the AC output power cable bears pulling force due to force majeure.
The cable outer diameter can be measured using the ruler sticker in the maintenance compartment.
Ensure that the cable jacket is in the maintenance compartment.
Ensure that the AC output power cable is secured. Failing to do so may cause the solar inverter to malfunction or damage to its terminal block by issues such as overheating.
Before closing the maintenance compartment door, check that the cables are connected correctly and securely, and clean up the foreign matter from the maintenance compartment.
If a screw on the maintenance compartment door is lost, obtain the spare screw from the fitting bag tied at the bottom of the maintenance compartment.

Figure 5-16 Multi-core cable connections

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Figure 5-17 Single-core cable connections NOTE
The 3236 mm cable is supported only by some models. Refer to the corresponding label to get the supported size.

Figure 5-18 3-pin model (125KTL) cable connections

(A) Four-core cable

(B) Three-core cable

(C) Single-core cable

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Figure 5-19 4-pin model (75KTL/100KTL/110KTL) cable connections

(A) Five-core cable (D) Three-core cable

(B) Four-core cable (including (C) Four-core cable (including

the PE cable)

the neutral wire)

(E) Single-core cable (including (F) Single-core cable

the neutral wire)

(excluding the neutral wire)

NOTE The cable colors shown in figures are for reference only. Select an appropriate cable according to the local standards.
Figure 5-20 Closing the Maintenance Compartment Door

—-End

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5.7 Connecting DC Input Power Cables
CAUTION
Two models of PV connectors are delivered with the device: Amphenol Helios H4 and Staubli MC4. PV connectors of different models cannot be used together. Device damage caused by mixed use of different PV connectors is not covered by the warranty. For details about using Amphenol Helios H4 PV connectors, see section 5.7.2
“Connecting Cables to Amphenol Helios H4 Connectors”. For details about using Staubli MC4 PV connectors, see section 5.7.3
“Connecting Cables to Staubli MC4 Connectors”.
5.7.1 Cable Connection Description
Precautions
DANGER
Before connecting the DC input power cable, ensure that the DC voltage is within the safe range (lower than 60 V DC) and that the three DC switches on the solar inverter are set to OFF. Failing to do so may result in electric shocks.
If you turn a DC SWITCH to ON by mistake when connecting or disconnecting DC input power cables, do not remove or insert DC input terminals. If you need to remove or insert a DC input terminal, perform the operations provided in 8.2 Power-Off for Troubleshooting.
When the solar inverter operates in grid-tied mode, do not perform maintenance or operations on the DC circuit, such as connecting or disconnecting a PV string or a PV module in the PV string. Failing to do so may cause electric shocks or arcing, which may also cause fire.

WARNING
Ensure that the following conditions are met. Otherwise, the solar inverter may be damaged, or even a fire could happen.
The open-circuit voltage of each PV string must be 1100 V DC or lower under any circumstances.
The polarities of electric connections are correct on the DC input side. The positive and negative terminals of a PV module connect to corresponding positive and negative DC input terminals of the solar inverter.

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NOTICE
Ensure that the PV module output is well insulated to ground.
The PV strings connecting to the same MPPT circuit should contain the same number of identical PV modules.
The solar inverter does not support full parallel connection for PV strings (full parallel connection: PV strings connect to one another in parallel outside the solar inverter and then connect to the solar inverter separately).
During the installation of PV strings and the solar inverter, the positive or negative terminals of PV strings may be short-circuited to ground if the power cable is not properly installed or routed. In this case, an AC or DC short circuit may occur and damage the solar inverter. The caused device damage is not covered under any warranty.

Terminal Description
The solar inverter has 20 DC input terminals. DC SWITCH 1 controls PV1PV8 (MPPT1MPPT4), DC SWITCH 2 controls PV9PV14 (MPPT5MPPT7), and DC SWITCH 3 controls PV15PV20 (MPPT8MPPT10).
Figure 5-21 DC terminals

When the DC input is not fully configured, the DC input terminals must meet the following requirements:

1. Evenly distribute the DC input power cables on the DC input terminals controlled by the three DC switches. DC SWITCH 1 is preferred.
2. Maximize the number of connected MPPT circuits.

For example, if the number of input routes is 119, the DC input terminals are selected as follows.

Number Terminal Selection of PV Strings

1

Any even-numbered route 2

PV2 and PV10

3

PV2, PV10, and PV18

4

PV2, PV6, PV10, and PV18

5

PV2, PV6, PV10, PV14, and 6

PV2, PV4, PV6, PV10, PV14,

PV18

and PV18

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Number Terminal Selection of PV Strings

7

PV2, PV4, PV6, PV10, PV14,

PV18, and PV20

9

PV2, PV4, PV6, PV8, PV10,

PV14, PV16, PV18, and

PV20

11

PV1, PV2, PV4, PV6, PV8,

PV10, PV12, PV14, PV16,

PV18, and PV20

13

PV1PV4, PV6, PV8, PV10,

PV12, PV14, PV16, and

PV18PV20

15

PV1PV6, PV8, PV10, PV12,

PV14, and PV16PV20

17

PV1PV8, PV10, PV12, and

PV14PV20

19

PV1PV10 and PV12PV20

Number Terminal Selection of PV Strings

8

PV2, PV4, PV6, PV8, PV10,

PV14, PV18, and PV20

10

PV2, PV4, PV6, PV8, PV10,

PV12, PV14, PV16, PV18,

and PV20

12

PV1, PV2, PV4, PV6, PV8,

PV10, PV12, PV14, PV16,

and PV18PV20

14

PV1PV4, PV6, PV8, PV10,

PV12, PV14, and PV16

PV20

16

PV1PV6, PV8, PV10, PV12,

and PV14PV20

18

PV1PV8, PV10, and PV12

PV20

N/A

5.7.2 Connecting Cables to Amphenol Helios H4 Connectors
Specification Requirements
Cables with high rigidity, such as armored cables, are not recommended, because poor contact may be caused by the bending of cables.

CAUTION
Use the Amphenol Helios H4 connectors delivered with the solar inverter. If the PV connectors are lost or damaged, purchase the connectors of the same model. The device damage caused by incompatible PV connectors is beyond the warranty scope.

Procedure
Step 1 Prepare the DC input power cables. Step 2 Crimp positive and negative metal contacts. Step 3 Insert the contacts into the corresponding positive and negative connectors. Step 4 Tighten the lock nuts on the positive and negative connectors.

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Step 5 Use a multimeter to measure the voltage between the positive and negative terminals of the PV string (measurement range no less than 1100 V).
If the voltage is a negative value, the DC input polarity is incorrect and needs correction.
If the voltage is greater than 1100 V, too many PV modules configured to the same string. Remove some PV modules.
Step 6 Insert the positive and negative connectors into the corresponding DC positive and negative input terminals of the solar inverter.

Figure 5-22 Connecting DC input power cables

Figure 5-23 Connector connection

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NOTICE
If the DC input power cable is reversely connected and DC switches are set to ON, do not immediately turn off the DC switches or reconnect the positive and negative connectors. Otherwise, the device may be damaged. The caused device damage is not covered under any warranty. Wait until the solar irradiance declines at night and the PV string current reduces to below 0.5 A. Then, turn off the three DC switches, remove the positive and negative connectors, and rectify the connection of the DC input power cable.
Connect the PV string connector to the inverter connector, and then pull back the PV string connector along the axial direction to check whether the connectors are securely connected.
The connector must be securely connected. Damages caused by improper connection are not covered under the warranty.

Figure 5-24 DC input power cabling requirement

NOTICE
During DC input power cabling, leave at least 50 mm of slack. The axial tension on PV connectors must not exceed 80 N. Radial stress or torque must not be generated on PV connectors.
—-End

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5.7.3 Connecting Cables to Staubli MC4 Connectors
Specification Requirements
Cables with high rigidity, such as armored cables, are not recommended, because poor contact may be caused by the bending of cables.

CAUTION
Use the Staubli MC4 connectors delivered with the solar inverter. If the PV connectors are lost or damaged, purchase the connectors of the same model. The device damage caused by incompatible PV connectors is beyond the warranty scope.
Procedure
Step 1 Prepare the DC input power cables. Step 2 Crimp positive and negative metal contacts. Step 3 Insert the contacts into the corresponding positive and negative connectors. Step 4 Tighten the lock nuts on the positive and negative connectors. Step 5 Use a multimeter to measure the voltage between the positive and negative
terminals of the PV string (measurement range no less than 1100 V). If the voltage is a negative value, the DC input polarity is incorrect and needs
correction. If the voltage is greater than 1100 V, too many PV modules configured to the
same string. Remove some PV modules. Step 6 Insert the positive and negative connectors into the corresponding DC positive and
negative input terminals of the solar inverter.
Figure 5-25 Connecting DC input power cables

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Figure 5-26 Connector connection

5 Electrical Connections

NOTICE
If the DC input power cable is reversely connected and DC switches are set to ON, do not immediately turn off the DC switches or reconnect the positive and negative connectors. Otherwise, the device may be damaged. The caused device damage is not covered under any warranty. Wait until the solar irradiance declines at night and the PV string current reduces to below 0.5 A. Then, turn off the three DC switches, remove the positive and negative connectors, and rectify the connection of the DC input power cable.
Connect the PV string connector to the inverter connector, and then pull back the PV string connector along the axial direction to check whether the connectors are securely connected.
The connector must be securely connected. Damages caused by improper connection are not covered under the warranty.
Figure 5-27 DC input power cabling requirement

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NOTICE During DC input power cabling, leave at least 50 mm of slack. The axial tension on PV connectors must not exceed 80 N. Radial stress or torque must not be generated on PV connectors.
—-End
5.8 Connecting the RS485 Communications Cables
Pin Definitions of the Communications Port
Figure 5-28 Communications port

Port RS485-1
Protection ground

Pin Definition

Description

1

RS485A IN, RS485

2

RS485A OUT, RS485 Used for cascading

differential signal+

differential signal+ solar inverters or

connecting to devices

3

RS485B IN, RS485

4

RS485B OUT, RS485 such as the

differential signal

differential signal SmartLogger.

5

PE, shielding ground 6

PE, shielding ground N/A

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Port RS485-2

Pin Definition

7

RS485A, RS485

differential signal+

Pin Definition

8

RS485B, RS485

differential signal

Description
Used for connecting to an RS485 slave device.
In the scenario of SDongle networking or a single solar inverter, the RS485-2 port is connected to a power meter to collect information about power at the gridtied point for gridtied point power control.
In the scenario of intelligent support tracking control, the RS485-2 port is connected to the support tracking system to collect support information.

Connecting the RS485 Communications Cables
When routing the communications cable, separate it from power cables to prevent communication from being affected. Connect the shield layer to the PE point. This section describes how to connect three communications cables.

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Figure 5-29 Connecting RS485 communications cables (48 mm four-hole rubber plug)

Figure 5-30 Connecting RS485 communications cables (48 mm two-hole or three- hole rubber plug)

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6.1 Check Before Power-on

No.

Acceptance Criteria

1

The solar inverter is installed correctly and securely.

2

The DC switches and the downstream AC switch are OFF.

3

All cables are connected correctly and securely.

4

The installation space is proper, and the installation environment

is clean and tidy.

5

The maintenance compartment door is closed and the door

screws are tightened.

6

Unused DC input terminals are sealed.

7

Unused USB and RESET ports are plugged with watertight caps.

6.2 Powering On the SUN2000
Precautions
WARNING When LED2 is steady green (meaning that the inverter is grid-tied), do not turn on any DC switch. Otherwise, the inverter may be damaged because the insulation resistance is not detected.

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NOTICE

Before turning on the AC switch between the SUN2000 and the power grid, use a multimeter set to the AC position to check that the AC voltage is within the specified range.

Do not turn the DC switch to the unloaded position

.

When the system is powered on or running, do not place obstacles (such as cables) to block the rotation of the handle or manually hold the handle. Otherwise, the DC switch cannot be automatically disconnected.

If the solar inverter has been stored for more than two years, it must be checked and tested by professionals before being put into use.

Procedure
Step 1 Turn on the AC switch between the SUN2000 and the power grid.

NOTICE If you perform Step 3 before Step 1, the SUN2000 reports a fault about abnormal shutdown. You can start the SUN2000 only after the fault is automatically rectified.
Step 2 (Optional) Remove the screws that secure DC SWITCH 1, DC SWITCH 2, and DC SWITCH 3. Store the screws properly for future power-off maintenance. NOTE
For the model used in Australia, perform this step based on the local standards.
Figure 6-1 Remove the screws

Step 3 Set DC SWITCH 1 (MAIN SWITCH) at the bottom of the solar inverter chassis to ON. When you hear a click, the switch is ON.
Step 4 Check the status of the PV connection indicator. If it is steady green, set DC SWITCH 2 and DC SWITCH 3 to ON.
Step 5 Observe the LED indicators to check the SUN2000 operating status.

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Step 6 Perform quick settings on the SUN2000 app. For details, see 7.1 Operations with the SUN2000 App.
—-End

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7.1 Operations with the SUN2000 App

7.1.1 App Introduction

Functions

The FusionSolar app is recommended when the SUN2000 is connected to the FusionSolar hosting cloud. The SUN2000 app is recommended when the SUN2000 is connected to other management systems.
The SUN2000 or FusionSolar app (app for short) is a mobile phone app that communicates with the SUN2000 over a WLAN/Bluetooth module or a USB data cable to allow for querying alarms, setting parameters, and performing routine maintenance as an easy-to-use maintenance platform.

Connection Mode
After the DC or AC side of the SUN2000 is powered on, you can connect the app to it through a WLAN module, a Bluetooth module or a USB data cable.

NOTICE
Over a WLAN module: The USB-Adapter2000-C WLAN module is supported. Over a Bluetooth module: The USB-Adapter2000-B Bluetooth module is
supported. Over a USB data cable: The USB 2.0 port is supported. Use the USB data cable
delivered with the mobile phone. Mobile phone operating system: Android 4.0 or later. Recommended phone brands: Huawei and Samsung.

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Figure 7-1 Connection over a WLAN module or a Bluetooth module

(A) SUN2000

(B) WLAN module or Bluetooth module

Figure 7-2 Connection over a USB data cable

(C) Mobile phone

(A) SUN2000
Disclaimer

(B) USB data cable

(C) Mobile phone

NOTICE
The configurable parameters of the SUN2000 vary with the device model and grid code.
If you change the grid code, some parameters may be restored to factory defaults. After the grid code is changed, check whether the previously set parameters are affected.
Delivering a reset, factory reset, shutdown, or upgrade command to the solar inverters may cause power grid connection failure, which affects the energy yield.
Only professionals are allowed to set the grid parameters, protection parameters, feature parameters, and power adjustment parameters of the solar inverters. If the grid parameters, protection parameters, and feature parameters are incorrectly set, the solar inverters may not connect to the power grid. If the power adjustment parameters are incorrectly set, the solar inverters may not connect to the power grid as required. In these cases, the energy yield will be affected.
The parameter names, value ranges, and default values are subject to change.

7.1.2 Downloading and Installing the App
FusionSolar app: Scan the QR code and download the latest installation package.

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SUN2000 app: Log in to Huawei AppGallery (https://appstore.huawei.com), search for SUN2000, and download the app installation package. You can also scan the QR code (https://appgallery.cloud.huawei.com/appdl/C10279542) to download the installation package.
QR code:

7.1.3 Logging In to the App

Prerequisites

The DC or AC side of the SUN2000 has been energized.
Connection over a WLAN module or a Bluetooth module:
a. The WLAN module or Bluetooth module is connected to the USB port at the bottom of the SUN2000.
b. The WLAN or Bluetooth function is enabled.
c. Keep the mobile phone within 5 m from the SUN2000. Otherwise, the communication between them would be affected.
Connection over a USB cable:
a. The USB data cable is connected from the USB port at the bottom of the SUN2000 to the port on the mobile phone.
b. If the USB data cable is successfully connected, the message Connected to USB Accessory will pop up on the phone. Otherwise, the cable is not connected.

Procedure

1. Run the app and select a connection mode.

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NOTE
The screenshots in this document correspond to the SUN2000 app 3.2.00.013 (Android) and FusionSolar app 5.7.010 (Android).
When the WLAN connection is used, scan the QR code of the WLAN module to access the login screen.
When the WLAN connection is used, the initial name of the WLAN hotspot is Adapter-WLAN module SN, and the initial password is Changeme. Use the initial password upon first power-on and change it immediately after login. To ensure account security, change the password periodically and keep the new password in mind. Not changing the initial password may cause password disclosure. A password left unchanged for a long period of time may be stolen or cracked. If a password is lost, devices cannot be accessed. In these cases, the user is liable for any loss caused to the PV plant.
When the Bluetooth connection is used, the connected Bluetooth device is named after last 8 digits of the SN barcode+HWAPP.
After you select Use by default for this USB accessory, a message that asks you to confirm the USB access will not appear if you log in to the app again without removing the USB data cable.
a. (Scenario in which the SUN2000 is connected to the FusionSolar hosting cloud) Run the FusionSolar app and access the Device Commissioning screen.

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Figure 7-3 Selecting a connection mode (with network access)

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Figure 7-4 Selecting a connection mode (without network access)

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b. (Scenario in which the SUN2000 is connected to other management systems) Run the SUN2000 app and access the operation screen.

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Figure 7-5 Selecting a connection method

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2. Select a login user and enter the login password to access the quick settings screen or the main menu screen.
NOTICE
The login password is the same as that for the SUN2000 connected to the app and is used only when the SUN2000 connects to the app.
The initial passwords for Common User, Advanced User, and Special User are all 00000a.
Use the initial password upon first power-on and change it immediately after login. To ensure account security, change the password periodically and keep the new password in mind. Not changing the initial password may cause password disclosure. A password left unchanged for a long period of time may be stolen or cracked. If a password is lost, devices cannot be accessed. In these cases, the user is liable for any loss caused to the PV plant.
During the login, if five consecutive invalid password entries are made (the interval between two consecutive entries is less than 2 minutes), the account will be locked for 10 minutes. The password should consist of six characters.
If you log in to the app after the device connects to the app for the first time or factory defaults are restored, the quick settings screen will be displayed. Set basic parameters as prompted. If you do not set basic parameters for the inverter on the quick settings screen, the screen is still displayed when you log in to the app next time.
To set SUN2000 basic parameters on the quick settings screen, switch to Advanced User. If you log in as Common User or Special User, enter the password of the advanced user to access the Quick Settings screen.

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Figure 7-6 Login

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7.1.4 Operations Related to the Advanced User
Ensure that the DC side of the SUN2000 is energized before setting grid parameters, protection parameters, and feature parameters.
7.1.4.1 Setting Grid Parameters
Procedure
Step 1 Choose Settings > Grid parameters to set grid parameters.
Figure 7-7 Grid parameters

Table 7-1 Grid parameters Parameter Grid Code
Isolation settings

Description
Set this parameter based on the grid code of the country or region where the inverter is used and the inverter application scenario.
Set the working mode of the inverter based on the grounding status at DC side and the connection to the power grid.

—-End

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7.1.4.2 Setting Protection Parameters

Procedure
Step 1 Choose Settings > Protection parameters to set protection parameters.

Figure 7-8 Protection parameters

Table 7-2 Protection parameters

Parameter

Description

Insulation resistance protection threshold (M)

To ensure device safety, the SUN2000 detects the insulation resistance between the input side and the ground when it starts a self-check. If the detected value is less than the preset value, the SUN2000 does not export power to the power grid.

—-End
7.1.4.3 Setting Feature Parameters
Procedure
Step 1 Choose Settings > Feature Parameters, and set feature parameters.

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Figure 7-9 Feature parameters

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Table 7-3 Feature parameters Parameter MPPT multi-peak scanning
MPPT multi-peak scan interval (min)

Description
When the inverter is used in scenarios where PV strings are greatly shaded, set this parameter to Enable, and then the inverter will perform MPPT scanning at regular intervals to locate the maximum power.
Specifies the MPPT scanning interval. This parameter is displayed when MPPT multi-peak scanning is set to Enable.

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Parameter RCD enhancement
Night-time reactive power output
PID protection at night Power quality optimization mode PV module type
Built-in PID compensation direction

Description
RCD refers to the residual current of the inverter to the ground. To ensure device and personal safety, RCD should be limited to the specified value in the standard. If an AC switch with a residual current detection function is installed outside the inverter, this function should be enabled to reduce the residual current generated when the inverter is running, thereby preventing the AC switch from misoperations.
In some specific application scenarios, a power grid company requires that the inverter can perform reactive power compensation at night to ensure that the power factor of the local power grid meets requirements.
This parameter is displayed when Isolation settings is set to Input ungrounded, with TF.
When the inverter outputs reactive power at night and this parameter is set to Enable, the inverter will shut down automatically if it detects abnormal status of the PID compensation.
If this parameter is set to Enable, the inverter output current harmonics will be optimized.
This parameter is used to set different types of PV modules and the shutdown time of the concentration PV module. If the concentration PV modules are shaded, the power drops drastically to 0 and the inverter shuts down. The energy yield would be affected since it takes too long for the power to resume and inverter to restart. The parameter does not need to be set for crystalline silicon and filmy PV modules.
If this parameter is set to Crystalline silicon or Film, the inverter automatically detects the power of PV modules when they are shaded and shuts down if the power is too low.
When concentration PV modules are used:
If this parameter is set to CPV 1, the inverter can quickly restart in 60 minutes if the input power of PV modules drops drastically due to shading.
If this parameter is set to CPV 2, the inverter can quickly restart in 10 minutes if the input power of PV modules drops drastically due to shading.
When the external PID module compensates the PID voltage for the PV system, set Built-in PID compensation direction to the actual compensation direction of the PID module so that the inverter can output reactive power at night.
This parameter is displayed when PV module type is set to Crystalline silicon. Select PVpositive offset for P-type PV modules. Select PV+ negative offset for N-type PV modules.

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Parameter String connection mode
Automatic OFF due to communication interrupted
Automatic ON due to communication resumed
Communication interruption duration (min) Soft start/boot time (s) Shutdown gradient (%/s) Night-time hibernation MBUS communication Delay upgrade

Description
Specifies the connection mode of PV strings.
When PV strings connect to the inverter separately (All PV strings separated), there is no need to set this parameter. The inverter can automatically detect the connection mode of the PV strings.
When PV strings connect to one another in parallel outside the inverter and then connect to it independently (All PV strings connected), set this parameter to All PV strings connected.
The standards of certain countries and regions require that the inverter must shut down after the communication is interrupted for a certain time.
If Automatic OFF due to communication interrupted is set to Enable and the inverter communication is interrupted for a specified time (set by Communication interruption duration), the inverter will automatically shut down.
If this parameter is set to Enable, the inverter automatically starts after communication recovers. If this parameter is set to Disable, the inverter needs to be started manually after communication recovers.
This parameter is displayed when Automatic OFF due to communication interrupted is set to Enable.
Specifies the duration for determining communication interruption. Used for automatic shutdown for protection in case of communication interruption.
Specifies the duration for the power to gradually increase when the inverter starts.
Specifies the power change speed when the inverter shuts down.
The inverter monitors PV strings at night. If this parameter is set to Enable, the monitoring function of the inverter will hibernate at night to reduce power consumption.
For inverters that support RS485 communication and MBUS communication, you are advised to set this parameter to Disable to reduce power consumption.
This parameter is mainly used in the upgrade scenarios where the PV power supply is disconnected at night due to no sunlight or unstable at dawn or dusk due to poor sunlight.
After the inverter starts to upgrade, if Delay upgrade is set to Enable, the upgrade package is loaded first. After the PV power supply recovers and the activation conditions are met, the inverter automatically activates the upgrade.

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Parameter RS485-2 communication
Tracker controller Duration for determining shorttime grid disconnection (ms)
AFCI

Description
If this parameter is set to Enable, the RS485-2 port can be used. If the port is not used, you are advised to set this parameter to Disable to reduce power consumption.
Selects a controller vendor.
The standards of certain countries and regions require that the inverter should not disconnect from the power grid if the power grid experiences a short-time failure. After the fault is rectified, the inverter output power needs to be quickly restored.
The North American standard requires that the inverter should have DC arc detection function.

—-End
7.1.4.4 Built-in PID Recovery

NOTICE
Ensure that the inverter ground cable is securely connected. Otherwise, the built-in PID repair function will be affected and electric shocks may occur.
Working Principle
When the SUN2000 is disconnected from the network, the built-in PID can repair the PV positive offset. (PV positive offset refers to raising the voltage between PV and the ground to above 0 V through voltage compensation.) When designing a PV plant, confirm with the PV module manufacturer that the anti- PID voltage compensation direction of the PV module is the PV positive offset. Otherwise, PV modules may be damaged.
Procedure
Step 1 Choose Settings > Feature Parameters. The parameter setting screen is displayed.

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Figure 7-10 Built-in PID Recovery

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Table 7-4 Parameters settings Parameter PID running mode PID nighttime off- grid repair

Description
Specifies the operation mode of the inverter built-in PID.
Specifies whether to enable the PID nighttime off-grid repair. If PID running mode is not set to Disable, the parameter can be set.

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Parameter PID daytime off-grid repair

Description
Specifies whether to enable the PID daytime off-grid repair. If PID running mode is not set to Disable, the parameter can be set.

—-End

7.1.4.5 AFCI

Function

If PV modules or cables are not properly connected or damaged, electric arcs may occur, which may cause fire. Huawei SUN2000s provide unique arc detection in compliance with UL 1699B-2018 to ensure the safety of users’ lives and property.
This function is enabled by default. The SUN2000 automatically detects arc faults. To disable this function, log in to the FusionSolar App, enter the Device Commissioning screen, choose Settings > Feature parameters, and disable AFCI.
NOTE
The AFCI function works only with Huawei optimizers or ordinary PV modules, but does not support third-party optimizers or intelligent PV modules.

Clearing Alarms
The AFCI function involves the DC arc fault alarm.
The SUN2000 has the AFCI alarm automatic clearance mechanism. If an alarm is triggered for less than five times within 24 hours, the SUN2000 automatically clears the alarm. If the alarm is triggered for five times or more within 24 hours, the SUN2000 locks for protection. You need to manually clear the alarm on the SUN2000 so that it can work properly.
You can manually clear the alarm as follows:
Method 1: FusionSolar App Log in to the FusionSolar App and choose My > Device Commissioning. On the Device Commissioning screen, connect and log in to the SUN2000 that generates the AFCI alarm, tap Alarm management, and tap Clear on the right of the DC arc fault alarm to clear the alarm.

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Figure 7-11 Alarm management

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Method 2: FusionSolar Smart PV Management System Log in to the FusionSolar Smart PV Management System using a non-owner account, choose Maintenance > Alarm Management, select the DC arc fault alarm, and click Clear to clear the alarm.
Figure 7-12 Clearing alarms
Switch to the owner account with PV plant management rights. On the home page, click the PV plant name to go to the PV plant page, and click OK as prompted to clear the alarm.
7.1.5 Operations Related to the Special User
Ensure that the DC side of the SUN2000 is energized before setting grid parameters, protection parameters, feature parameters, and grid adjustment parameters.
7.1.5.1 Setting Grid Parameters Procedure
Step 1 Choose Settings > Grid Parameters and set grid parameters.

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Figure 7-13 Grid parameters

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Table 7-5 Grid parameters Parameter Grid Code
Isolation settings
Output mode
Automatically start upon grid recovery Grid connected recovery time from grid faults (s)

Description
Set this parameter based on the grid code of the country or region where the inverter is used and the inverter application scenario.
Set the working mode of the inverter based on the grounding status at DC side and the connection to the power grid.
Specifies whether the inverter output has a neutral wire based on the application scenario.
Specifies whether to allow the inverter to automatically start after the power grid recovers.
Specifies the time after which the inverter begins restarting after the power grid recovers.

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Parameter

Description

Grid reconnection voltage upper limit (V)

The standards of certain countries and regions require that after the inverter shuts down for protection due to a fault, if the power grid voltage is higher than Grid reconnection voltage upper limit, the inverter is not allowed to reconnect to the grid.

Grid reconnection voltage lower limit (V)

The standards of certain countries and regions require that after the inverter shuts down for protection due to a fault, if the power grid voltage is lower than Grid reconnection voltage lower limit, the inverter is not allowed to reconnect to the grid.

Grid reconnection frequency upper limit (Hz)

The standards of certain countries and regions require that after the inverter shuts down for protection due to a fault, if the power grid frequency is higher than Grid reconnection frequency upper limit, the inverter is not allowed to reconnect to the grid.

Grid reconnection frequency lower limit (Hz)

The standards of certain countries and regions require that after the inverter shuts down for protection due to a fault, if the power grid frequency is lower than Grid reconnection frequency lower limit, the inverter is not allowed to reconnect to the grid.

Reactive power compensation (cos-P) trigger voltage (%)

Specifies the voltage threshold for triggering reactive power compensation based on the cos-P curve.

Reactive power compensation (cos-P) exit voltage (%)

Specifies the voltage threshold for exiting reactive power compensation based on the cos-P curve.

—-End
7.1.5.2 Setting Protection Parameters Procedure
Step 1 Choose Settings > Protection Parameters and set protection parameters.

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Figure 7-14 Protection parameters

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Table 7-6 Protection parameters
Parameter
Voltage unbalance protection threshold (%)
10-min overvoltage protection threshold (V)
10-min overvoltage protection duration (ms)

Description Specifies the solar inverter protection threshold when the power grid voltage is unbalanced. Specifies the 10-minute overvoltage protection threshold.
Specifies the 10-minute overvoltage protection duration.

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Parameter

Description

Level-N overvoltage protection threshold (V)

Specifies the level-N grid overvoltage protection threshold.
NOTE
N can be 1, 2, 3, 4, 5, or 6.
When HVRT is set to Enable, and the value of Level-1 overvoltage protection threshold is larger than that of HVRT threshold, the solar inverter may repeatedly start and shut down if the power grid voltage is between the two values.

Level-N overvoltage protection duration (ms)

Specifies the level-N grid overvoltage protection duration.
NOTE N can be 1, 2, 3, 4, 5, or 6.

Level-N undervoltage protection threshold (V)

Specifies the level-N grid undervoltage protection threshold.
NOTE
N can be 1, 2, 3, 4, 5, or 6.
When LVRT is set to Enable, and the value of Level-1 undervoltage protection threshold is less than that of LVRT threshold, the solar inverter may repeatedly start and shut down if the power grid voltage is between the two values.

Level-N undervoltage protection duration (ms)

Specifies the level-N grid undervoltage protection duration.
NOTE N can be 1, 2, 3, 4, 5, or 6.

Level-N overfrequency protection threshold (Hz)

Specifies the level-N grid overfrequency protection threshold.
NOTE N can be 1, 2, 3, 4, 5, or 6.

Level-N overfrequency protection duration (ms)

Specifies the level-N grid overfrequency protection duration.
NOTE N can be 1, 2, 3, 4, 5, or 6.

Level-N underfrequency protection threshold (Hz)

Specifies the level-N grid underfrequency protection threshold.
NOTE N can be 1, 2, 3, 4, 5, or 6.

Level-N underfrequency protection duration (ms)

Specifies the level-N grid underfrequency protection duration.
NOTE N can be 1, 2, 3, 4, or 5.

Active islanding protection

Specifies whether to enable the active islanding protection function.

—-End
7.1.5.3 Setting Feature Parameters Procedure
Step 1 Choose Settings > Feature Parameters, and set feature parameter

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Figure 7-15 Feature parameters

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Table 7-7 Feature parameters Parameter LVRT

Description
LVRT is short for low voltage ride-through. When the grid voltage is abnormally low for a short time, the inverter cannot disconnect from the power grid immediately and has to work for some time.

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Parameter Threshold for triggering LVRT (V) LVRT gradient K1
LVRT gradient K2
Percentage of LVRT reactive current limiting
Threshold of LVRT zero-current mode LVRT mode LVRT characteristic curve HVRT

Description
Specifies the threshold for triggering LVRT. The threshold settings should meet the local grid standard.
This parameter is displayed when LVRT is set to Enable.
During LVRT, the solar inverter needs to generate positivesequence reactive power to support the power grid. This parameter is used to set the positive- sequence reactive power generated by the solar inverter.
For example, if you set LVRT gradient K1 to 2, the increment of positive- sequence reactive current generated by the solar inverter is 20% of the rated current when the AC voltage decreases by 10% during LVRT.
This parameter is displayed when LVRT is set to Enable.
During LVRT, the solar inverter needs to generate negativesequence reactive power to support the power grid. This parameter is used to set the negative- sequence reactive power generated by the solar inverter.
For example, if you set LVRT gradient K2 to 2, the increment of negative- sequence reactive current generated by the solar inverter is 20% of the rated current when the AC voltage decreases by 10% during LVRT.
This parameter is displayed when LVRT is set to Enable.
During LVRT, the solar inverter needs to limit the reactive current.
For example, if you set Percentage of LVRT reactive current limiting to 50, the reactive current upper limit of the solar inverter is 50% of the rated current during LVRT.
This parameter is displayed when LVRT is set to Enable.
When Zero current due to power grid fault is enabled, if the power grid voltage is less than the value of Threshold of LVRT zero-current mode during LVRT, the zero current mode is used. Otherwise, the mode configured in LVRT mode is used.
This parameter is displayed when LVRT is set to Enable.
Sets LVRT mode. The options are Zero-current mode, Constant current mode, Reactive power priority mode, and Active power priority mode.
This parameter is displayed when LVRT is set to Enable.
Specifies the low voltage ride-through capability of the inverter.
HVRT is short for high voltage ride-through. When the grid voltage is abnormally high for a short time, the inverter cannot disconnect from the power grid immediately and has to work for some time.

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Parameter Threshold for triggering HVRT (V) HVRT gradient K1
HVRT gradient K2
Grid voltage protection shield during VRT VRT exit hysteresis threshold
Zero current due to power grid fault
Active islanding protection

Description
Specifies the threshold for triggering HVRT. The threshold settings should meet the local grid standard.
This parameter is displayed when HVRT is set to Enable.
During HVRT, the solar inverter needs to generate positivesequence reactive power to support the power grid. This parameter is used to set the positive- sequence reactive power generated by the solar inverter.
For example, if you set HVRT gradient K1 to 2, the increment of positive- sequence reactive current generated by the solar inverter is 20% of the rated current when the AC voltage increases by 10% during HVRT.
This parameter is displayed when HVRT is set to Enable.
During HVRT, the solar inverter needs to generate negativesequence reactive power to support the power grid. This parameter is used to set the negative- sequence reactive power generated by the solar inverter.
For example, if you set HVRT gradient K2 to 2, the increment of negative- sequence reactive current generated by the solar inverter is 20% of the rated current when the AC voltage increases by 10% during HVRT.
This parameter is displayed when HVRT is set to Enable.
Specifies whether to shield the undervoltage protection function during LVRT or HVRT.
This parameter is displayed when LVRT or HVRT is set to Enable.
Specifies the LVRT/HVRT recovery threshold.
This parameter is displayed when LVRT or HVRT is set to Enable.
LVRT recovery threshold = Threshold for triggering LVRT + VRT exit hysteresis threshold
HVRT recovery threshold = Threshold for triggering HVRT VRT exit hysteresis threshold
Certain countries and regions have requirements on the output current during high/low voltage ride-through. In this case, set this parameter to Enable. After this parameter is set to Enable, the output current is less than 10% of the rated current during high/low voltage ride-through.
This parameter is displayed when LVRT or HVRT is set to Enable.
Specifies whether to enable the active islanding protection function.

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Parameter Automatic OFF due to communication interrupted
Automatic ON due to communication resumed
Communication interruption duration (min) Soft start/boot time (s) Soft start time after grid failure (s) TCP heartbeat interval (s) TCP frame length Heartbeat period at application layer (min) Parallel communication mode

Description
The standards of certain countries and regions require that the inverter must shut down after the communication is interrupted for a certain time. If Automatic OFF due to communication interrupted is set to Enable and the inverter communication is interrupted for a specified time (set by Communication interruption duration), the inverter will automatically shut down.
If this parameter is set to Enable, the inverter automatically starts after communication recovers. If this parameter is set to Disable, the inverter needs to be started manually after communication recovers. This parameter is displayed when Automatic OFF due to communication interrupted is set to Enable.
Specifies the duration for determining communication interruption. Used for automatic shutdown for protection in case of communication interruption.
Specifies the duration for the power to gradually increase when the inverter starts.
Specifies the time for the power to gradually increase when the inverter restarts after the power grid recovers.
Specifies the TCP link timeout period for the solar inverter to connect to the management system.
Specifies the maximum length of the TCP frame sent by the northbound device to the solar inverter.
Specifies the timeout period for the solar inverter to connect to the management system.
Sets the communication mode between the master and slave servers in SDongle scenarios.

—-End
7.1.5.4 Setting Power Adjustment Parameters Procedure
Step 1 Choose Settings > Power adjustment and set power adjustment parameters.

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Figure 7-16 Power adjustment parameters

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Table 7-8 Power adjustment parameters

Parameter

Description

Remote power schedule

If this parameter is set to Enable, the inverter responds to the scheduling instruction from the remote port. If this parameter is set to Disable, the inverter does not respond to the scheduling instruction from the remote port.

Schedule instruction valid duration (s)

Specifies the time for maintaining the scheduling instruction.
When this parameter is set to 0, the scheduling instruction takes effect permanently.

Maximum active power (kW)

Specifies the output upper threshold for the maximum active power to adapt to different market requirements.

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Parameter

Description

OFF at 0% power limit

If this parameter is set to Enable, the inverter shuts down after receiving the 0% power limit command. If this parameter is set to Disable, the inverter does not shut down after receiving the 0% power limit command.

Active power change gradient (%/s)

Specifies the change speed of the inverter active power.

Derated by active power % (%)

Adjusts the active power output of the inverter by percentage.
This parameter is displayed if Remote power schedule is set to Enable.
If this parameter is set to 100, the inverter outputs based on the maximum output power.

Derated by fixed active power (kW)

Adjusts the active power output of the inverter by fixed value.
This parameter is displayed if Remote power schedule is set to Enable.
For 1000 V inverters, the maximum value of this parameter for the SUN2000 -25KTL-US is 27.5 kW.

Night-time reactive power output

In some specific application scenarios, a power grid company requires that the inverter can perform reactive power compensation at night to ensure that the power factor of the local power grid meets requirements.
This parameter is displayed when Isolation settings is set to Input ungrounded, with TF.

Enable reactive power parameters at night

When this parameter is set to Enable, the inverter outputs reactive power based on the setting of Reactive power compensation at night. Otherwise, the inverter executes the remote scheduling command.
This parameter is displayed when Night-time reactive power output is set to Enable.

Night-time reactive power compensation (kVar)

During the reactive power compensation at night, the reactive power is scheduled by fixed value.
This parameter is displayed when Night-time reactive power output and Enable reactive power parameters at night are set to Enable.

Reactive power change gradient Specifies the change speed of the inverter reactive power. (%/s)

Reactive power adjustment time Specifies the adjustment time for the reactive power to reach

(s)

the target value during reactive power adjustment.

Plant active power gradient (min/100%)

Specifies the rate of active power rise due to sunlight changes.

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Parameter Average active power filtering time (ms) Power factor
Reactive power compensation (Q/S) Overfrequency derating
Frequency for triggering overfrequency derating (Hz)
Frequency for exiting overfrequency derating (Hz)
Cutoff frequency of overfrequency derating (Hz)
Cutoff power of overfrequency derating (%)

Description
Specifies the period of active power rise due to sunlight changes. This parameter is used with Plant active power gradient.
Specifies the power factor of the inverter. This parameter is displayed if Remote power schedule is set to Enable.
Specifies the reactive power output by the