25KTLX-G3 Three Phase Inverter Solar

Specifications

• Product Model: SOFAR 25 … 50KTLX-G3
• Version: 01 | March 2023 English
• Available Models: 25KTLX-G3, 30KTLX-G3, 30KTLX-G3-A, 33KTLX-G3,
  36KTLX-G3, 40KTLX-G3, 45KTLX-G3, 50KTLX-G3

Product Features

The SOFAR 25 … 50KTLX-G3 inverter comes with the following
features:

• Product dimensions
• Various power grid types support
• Labelling on the device for easy identification
• Efficiency curve for optimized performance

Installation

Before installation, carefully follow these steps:

1. Read the installation information in the manual
2. Prepare necessary tools for installation
3. Choose a suitable installation location
4. Unpack the inverter and proceed with the installation
   process

Electrical Connections

When making electrical connections, remember:

• Follow safety instructions for all connections

• Connect PE cables, DC cables, and AC power cables as per
  guidelines

• Utilize communication ports for system integration

• Ensure proper energy meter connection and system
  monitoring

Commissioning the Inverter

Steps for commissioning the inverter:

1. Perform safety tests before starting the inverter
2. Start the inverter as per instructions
3. Explore the smartphone app “SOFAR View” for additional
   functionalities

Operation of the Device

To operate the device effectively:

• Utilize the control panel and display field for monitoring

• Navigate through standard display and status display
  options

• Understand the menu structure for easy access to settings

• Perform software updates regularly for optimal performance

Troubleshooting and Maintenance

If issues arise:

• Refer to troubleshooting section in the manual for
  guidance

• Maintain the inverter as per maintenance instructions
  provided

Technical Data

For detailed technical specifications, refer to the product
manual.

FAQ (Frequently Asked Questions)

Q: What should I do if I encounter an error code on the
display?

A: Error codes indicate specific issues. Refer
to the troubleshooting section of the manual to identify and
resolve the error.

SOFAR 25 … 50KTLX-G3
Installation and operating manual
Version 01 | March 2023 English
SOFAR 25KTLX-G3, 30KTLX-G3, 30KTLX-G3-A, 33KTLX-G3, 36KTLX-G3, 40KTLX-G3, 45KTLX-G3, 50KTLX-G3

TABLE OF CONTENT

Table of Content

1 About this manual

1.1

Copyright declaration

1.2

Structure of the manual

1.3

Scope

1.4

Target group

1.5

Symbols used

2 Basic safety information

2.1

Safety information

2.2

Symbols and signs

3 Product features

3.1

Product dimensions

3.2

Power grid types

3.3

Product dimensions

3.4

Labelling on the device

3.5

Functional features

3.6

Efficiency curve

4 Installation

4.1

Installation information

4.2

Installation procedure

4.3

Examination before installation

4.4

Connections

2

5 5 5 6 6 6 8 8 13 16 16 17 17 19 19 21 23 23 23 24 26
SOFAR 25 … 50KTLX-G3

4.5

Tools

4.6

Installation location

4.7

Unpacking the inverter

4.8

Installation of the inverter

5 Electrical connections

5.1

Safety instructions

5.2

Electrical connection

5.3

Connecting the PE cables

5.4

Connecting the DC cables

5.5

Connecting the AC power cables

5.6

Communication ports

5.7

Energy meter connection

5.8

System monitoring

6 Commissioning the inverter

6.1

Safety test before commissioning

6.2

Starting the inverter

6.3

Smartphone app SOFAR View

7 Operation of the device

7.1

Control panel and display field

7.2

Standard display

7.3

Status display

7.4

Menu structure

SOFAR 25 … 50KTLX-G3

TABLE OF CONTENT
26 28 30 31 33 33 34 35 37 40 46 53 55 61 61 61 62 63 63 64 64 65
3

TABLE OF CONTENT

7.5

Software update

68

8 Troubleshooting handling

70

8.1

Troubleshooting

70

8.2

Maintenance

79

9 Technical data

82

4

SOFAR 25 … 50KTLX-G3

ABOUT THIS MANUAL
1 About this manual
This manual contains important safety information that must be observed during installation and maintenance of the device. Carefully read this manual before use and retain it for future reference! This manual must be treated as an integral component of the device. The manual must be kept in close proximity to the device, including when it is handed over to another user or moved to a different location.
1.1 Copyright declaration
The copyright of this manual is owned by SOFARSOLAR. It may not be copied ­ neither partially nor completely ­ by companies or individuals (including software, etc.) and must not be reproduced or distributed in any form, or with the appropriate means. SOFARSOLAR reserves the right to final interpretation. This manual may be amended following feedback from users or customers. Please consult our website at http://www.sofarsolar.eu for the latest version. The current version was updated on 12/07/2023.
1.2 Structure of the manual
This manual contains important safety and installation instructions that must be observed during installation and maintenance of the device.

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5

ABOUT THIS MANUAL
1.3 Scope
This product manual describes the installation, electrical connection, commissioning, maintenance and fault elimination procedures of the SOFAR 25 … 50KTLX-G3 inverters.
1.4 Target group
This manual is intended for specialist electrical engineers who are responsible for the installation and commissioning of the inverter in the PV system, as well as the PV system operators.
1.5 Symbols used
This manual contains information on safe operation and uses symbols to ensure the safety of persons and property as well as the efficient operation of the inverter. Please read through the following symbol explanations carefully in order to prevent injury or property damage.

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SOFAR 25 … 50KTLX-G3

ABOUT THIS MANUAL
DANGER Non-observance will result in death or serious injury.
· Follow the warnings in order to prevent death or serious injury!
WARNING Non-observance may result in death or serious injury.
· Follow the warnings in order to prevent serious injury!
CAUTION Non-observance may result in minor injury.
· Follow the warnings in order to prevent injury!
ATTENTION Non-observance may result in property damage!
· Follow the warnings in order to prevent damage to or destruction of the product.
NOTE · Provides tips essential to the optimal operation of the product.

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7

BASIC SAFETY INFORMATION
2 Basic safety information
NOTE · If you have any questions or problems after reading the following information, please contact SOFARSOLAR
This chapter details the safety information pertaining to the installation and operation of the device.
2.1 Safety information
Read and understand the instructions within this manual and familiarise yourself with the relevant safety symbols in this chapter before beginning with the installation of the device and eliminating any faults. Before connecting to the power grid, you must obtain official authorisation from the local power grid operator in accordance with the corresponding national and state requirements. Furthermore, operation may only be carried out by qualified electricians. Please contact the nearest authorised service centre if any maintenance or repairs are required. Please contact your dealer to obtain information about your nearest authorised service centre. Do NOT carry out repairs on the device yourself; this may lead to injury or property damage. Before installing the device or carrying out maintenance on it, you must open the DC switch in order to interrupt the DC voltage of the PV generator. You can also switch off the DC voltage by opening the DC

8

SOFAR 25 … 50KTLX-G3

BASIC SAFETY INFORMATION
switch in the Array junction box. Not doing this may result in serious injury.
2.1.1 Qualified personnel
Personnel tasked with the operation and maintenance of the device must have the qualifications, competence and experience required to perform the described tasks, while also being capable of fully understanding all instructions contained within the manual. For safety reasons, this inverter may only be installed by a qualified electrician who: – has received training on occupational safety, as well as the
installation and commissioning of electrical systems – is familiar with the local laws, standards and regulations of the grid
operator. SOFARSOLAR assumes no responsibility for the destruction of property or any injuries to personnel caused by improper usage.
2.1.2 Installation requirements
Please install the inverter according to the information contained in the following section. Mount the inverter to a suitable object with a sufficient load-bearing capacity (e.g. walls, PV frames etc.) and ensure that the inverter is upright. Choose a suitable place for the installation of electrical devices. Ensure that there is sufficient space for an emergency exit which is suitable for maintenance. Ensure sufficient ventilation in order to guarantee an air circulation for the cooling of the inverter.

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9

BASIC SAFETY INFORMATION

2.1.3 Transport requirements
The factory packaging is specifically designed to prevent transport damage, i.e. violent shocks, moisture and vibrations. However, the device must not be installed if it is visibly damaged. In this case, notify the responsible transport company immediately.
2.1.4 Labelling on the device
The labels must NOT be concealed by items and foreign objects (rags, boxes, devices, etc.); they must be regularly cleaned and kept clearly visible at all times.
2.1.5 Electrical connection
Observe all applicable electrical regulations when working with the Solar inverter.
DANGER Dangerous DC voltage
· Before establishing the electrical connection, cover the PV modules using opaque material or disconnect the PV generator from the inverter. Solar radiation will cause dangerous voltage to be generated by the PV generator!

10

SOFAR 25 … 50KTLX-G3

BASIC SAFETY INFORMATION
DANGER Danger through electric shock!
· All installations and electrical connections may only be carried out by trained electricians!
IMPORTANT Authorisation for grid feed-in
· Obtain authorisation from the local power grid operator before connecting the inverter to the public power grid.
NOTE Voiding of guarantee
· Do not open the inverter or remove any of the labels. Otherwise, SOFARSOLAR shall assume no guarantee.
2.1.6 Operation DANGER
Electric shock · Contact with the electrical grid or the device’s terminals may result in an electric shock or fire! · Do not touch the terminal or the conductor which is connected to the electrical grid. · Follow all instructions and observe all safety documents that refer to the grid connection.

SOFAR 25 … 50KTLX-G3

11

BASIC SAFETY INFORMATION
CAUTION Burning due to hot housing
· While the inverter is being operated, several internal components will become very hot.
· Please wear protective gloves! · Keep children away from the device!
2.1.7 Repair and maintenance
DANGER Dangerous voltage!
· Before carrying out any repair work, first switch off the AC circuit breaker between the inverter and power grid, and then the DC switch.
· After switching off the AC circuit breaker and the DC switch, wait a minimum of 5 minutes before starting any maintenance or repair work.
IMPORTANT Unauthorised repairs!
· Following the elimination of any faults, the inverter should be fully functional once more. Should any repairs be required, please contact a local authorised service centre.
· The internal components of the inverter must NOT be opened without the relevant authorisation. Shenzhen SOFARSOLAR Co., Ltd. assumes no responsibility for any resulting losses or defects.

12

SOFAR 25 … 50KTLX-G3

BASIC SAFETY INFORMATION
2.2 Symbols and signs
CAUTION Beware of burning hazards due to the hot housing!
· While the inverter is in operation, only touch the display and the buttons, as the housing can become hot.

ATTENTION Implement earthing!
· The PV generator must be earthed in accordance with the requirements of the local power grid operator!
· For reasons of personal safety, we recommend that all PV module frames and inverters of the PV system are reliably earthed.
WARNING Damage due to overvoltage
· Ensure that the input voltage does not exceed the maximum permissible voltage. Overvoltage may cause long-term damage to the inverter, as well as other damage that is not covered by the warranty!
2.2.1 Symbols on the inverter
Several symbols pertaining to safety can be found on the inverter. Please read and understand the content of these symbols before starting the installation.

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13

BASIC SAFETY INFORMATION

Symbol

Description Residual voltage is present in the inverter! Before opening the inverter, you should wait five minutes to ensure that the capacitor has been fully discharged. Caution! Danger through electric shock
Caution! Hot surface
The product is compliant with EU guidelines
Earthing point
Please read the manual before installing the inverter Device degree of protection according to EN 60529 Positive and negative poles of the DC input voltage The inverter must always be transported and stored with the arrows pointing upward The temperature range in which the inverter can operate

14

SOFAR 25 … 50KTLX-G3

Symbol

BASIC SAFETY INFORMATION
Description RCM (Regulatory Compliance Mark) The product meets the requirements of the applicable Australian standards.

SOFAR 25 … 50KTLX-G3

15

PRODUCT FEATURES
3 Product features
This chapter describes the product features, dimensions and efficiency levels.
3.1 Product dimensions
The SOFAR 25 … 50KTLX-G3 is a grid-coupled PV inverter with up to two MPPTs which converts the direct current generated by PV systems into a three-phase alternating current and feeds it into the public power grid. The AC circuit breaker and DC switch are used as a disconnecting device and must be easily accessible.

SOFAR 25 … 50KTLX-G3 inverters may only be used with photovoltaic modules which do not require one of the poles to be earthed. In normal operation, the operating current must not exceed the limits specified within the technical data. Only photovoltaic modules may be connected at the input of the inverter (no batteries or other power sources must be connected).

16

SOFAR 25 … 50KTLX-G3

PRODUCT FEATURES

3.2

Power grid types

SOFAR 25 … 50KTLX-G3 are compatible with the following grid types:

TN-S
Transformer L1 L2 L3 N
PE
PE
25~50KTLX-G3

TN-C
Transformer L1 L2 L3 PEN
PE
25~50KTLX-G3

TN-C-S
Transformer L1 L2 L3 N
PE
PE
25~50KTLX-G3

TT
Transformer L1 L2 L3 N

IT
Transformer L1 L2 L3

PE
25~50KTLX-G3

PE
25~50KTLX-G3

NOTE · For the TT grid, voltage between N and PE should be less than 30 V.
3.3 Product dimensions
All SOFAR 25 … 50KTLX-G3 have the following dimensions: L × W × H = 585 mm × 480 mm × 220 mm

SOFAR 25 … 50KTLX-G3

17

PRODUCT FEATURES

480.0 539.0

585.0

231.0

front, side, back

bottom view

126.0

126.0

4-12.0 8- 10.0

2- 7.0

176.0

10.0

403.0

36.0

wall bracket

80.0

18

SOFAR 25 … 50KTLX-G3

PRODUCT FEATURES
NOTE · SOFAR 25 … 36KTLX-G3 inverters support 6-channel PV string input. · SOFAR 40 … 50KTLX-G3 and the HV models support 8channel PV string input.
3.4 Labelling on the device
Labelling must not be covered or removed!

3.5 Functional features
The DC output generated by the PV generator is filtered by the input board before it reaches the power board. The input board also provides functions such as the detection of insulation impedance and the measurement of the DC current and voltage. The DC current is converted into AC current by the power board. The AC current is filtered by the output board and fed into the power grid. The output board also provides functions such as grid voltage and current measurement, earth fault protection and a disconnecting relay. The control board

SOFAR 25 … 50KTLX-G3

19

PRODUCT FEATURES
supplies the auxiliary energy, controls the operating state of the inverter and displays the operating status on the display board. An error code will appear on the display if the inverter is in an abnormal operating state. At the same time, the control board may trigger the relay in order to protect the internal components.
3.5.1 Functions
A Digital inputs (DRMs) The inverter can be switched on/off or the grid power can be controlled via the external control. B Feeding of reactive power into the grid The inverter is capable of generating reactive power and can also feed it into the grid. The setting of the power factor (Cos Phi) can be controlled via the serial RS485 interface. C Limitation of the active power fed into the grid The inverter can limit the active power fed into the grid to a specific value (as a percentage of the rated output). D Output reduction at overfrequency within the grid If the grid frequency is higher than the limit value, the inverter will reduce the output power; this is required to ensure stability of the grid. E Data transfer The inverter (or a group of inverters) can be monitored remotely via the RS485 communication bus or via WiFi/GPRS. F Software update The device supports local updates via USB stick and remote updates via WiFi/GPRS.

20

SOFAR 25 … 50KTLX-G3

PRODUCT FEATURES

3.5.2 Electrical block diagram

+ PV1+-
+ PV2++ PV3++ PV4+-

PV Input Port

Input EMC Circuit

MPPT Circuit 1
MPPT Circuit 2
MPPT Circuit 3
MPPT Circuit 4

3.6 Efficiency curve

AC Inverter Circuit

Output Filter Circuit

Relay Protect Circuit

R

Output

S

EMC

T

Circuit N

PE

Efficieny (%)

100

99

98

97

96
95
94 0%

Vpv=540v Vpv=620v Vpv=850v

20%

40%

60%

80%

% of Rated Output Power

100%

Power efficiency curve (SOFAR 50KTLX-G3)

SOFAR 25 … 50KTLX-G3

21

%of Rated Output Power

PRODUCT FEATURES
120 100
80 60 40 20
0 180 190 200 210 220 230 240 250 260 270 280 290 300 Vgrid (V) Rated power ratio vs. Grid voltage

22

SOFAR 25 … 50KTLX-G3

INSTALLATION

4 Installation
4.1 Installation information
DANGER Fire hazard
· Do NOT install the inverter on flammable material. · Do NOT install the inverter in an area in which flammable or
explosive material is stored.
CAUTION Burning hazard
· Do NOT install the inverter in places where it can be accidentally touched. The housing and heat sink may become very hot while the inverter is being operated.
IMPORTANT Weight of the device
· Take into account the weight of the inverter when transporting and moving it.
· Choose a suitable installation location and -surface. · Commission a minimum of two persons with the
installation of the inverter. · Do not set down the inverter upside-down.
4.2 Installation procedure
Mechanical installation is performed as follows: 1. Examine the inverter before installation

SOFAR 25 … 50KTLX-G3

23

INSTALLATION
2. Prepare the installation 3. Select an installation location 4. Transport the inverter 5. Mount the rear panel 6. Install the inverter
4.3 Examination before installation
4.3.1 Checking the external packaging materials Packaging materials and components may become damaged during transportation. Therefore, the external packaging materials must be examined before the inverter is installed. Check the external packaging material for damage, e.g. holes and cracks. If you discover any cases of damage, do not unpack the inverter and contact the transport company and/or dealer immediately. It is recommended that the packaging material should be removed within 24 hours before installing the inverter.
4.3.2 Checking the delivery scope After unpacking the inverter, check that the delivery items are both intact and complete. In the event of any damage or missing components, contact the wholesaler.

24

SOFAR 25 … 50KTLX-G3

No. Image 1
2 3
4 5 6 7

Description Inverter SOFAR 25 … 50KTLX-G3
Wall bracket AC waterproof cover
M8*80 Hexagon screws PV+ metal pin PV- metal pin PV+ input terminal

8

PV- input terminal

9

M4 cross screw

10

M5 cross screw

11

M6 hexagon screw

12

AC terminal insulation partition

INSTALLATION
Quantity 1 1 1 4
6 / 8 6 / 8 6 / 8
6 / 8
6 1 1
4

SOFAR 25 … 50KTLX-G3

25

INSTALLATION

14

COM terminal

1

or

14

WiFi stick logger

1

15

R-type terminal (PE)

1

16

R-type terminal (L1/L2/L3/N)

4

17

Manual

1

18

Warranty card

1

19

Warranty registration form

1

*) second Pcs. for SOFAR 40…50KTLX-G3 + SOFAR 50KTLX-G3-HV

4.4 Tools

Prepare the tools required for the installation and the electrical connection.

No. Tool

Model

Function

01

Hammer drill Used to drill holes in the

Recommended wall.

drill: 60 mm

02

Screwdriver Used to tighten and loosen

screws when installing the

AC power cable; to remove

26

SOFAR 25 … 50KTLX-G3

No. Tool
03 04 05 06 07 08 09 10 11

INSTALLATION

Model Removal tool

Function
and install the screws of the AC terminal
Used to remove the PV terminal

Wire stripper Used to strip the wire

M6 Allen key

Used to turn the screw to connect the rear panel to the inverter.

Crimping tool Used to crimp power cables

Multimeter

Used to check the earthing

Marker

Used for marking

Measuring tape Used to measure distances

Spirit level ESD gloves

Used to align the wall bracket
for the installer

SOFAR 25 … 50KTLX-G3

27

INSTALLATION
No. Tool 12

Model

Function

Safety goggles for the installer

13

Anti-dust

for the installer

respiratory

mask

14

Socket wrench Used to install the

expansion bolts

15

Hammer

Used to install the

expansion bolts

4.5 Installation location
Choose a suitable position for the installation of the inverter. Ensure that the following requirements have been fulfilled:

28

SOFAR 25 … 50KTLX-G3

INSTALLATION Minimum distances for individual SOFAR 25 … 50KTLX-G3 inverters:

Minimum distances for several SOFAR 25 … 50KTLX-G3 inverters:

300mm 1000mm

100mm

200mm

SOFAR 25 … 50KTLX-G3

29

INSTALLATION
4.6 Unpacking the inverter
1. Open the packaging and have at least two people grip underneath the inverter at both sides.

2. Lift the inverter out of the packaging and move it to its installation position horizontally.

30

SOFAR 25 … 50KTLX-G3

INSTALLATION
ATTENTION Mechanical damage
· In order to prevent injuries and damage to the device, ensure that the inverter is kept balanced while it is being moved – it is very heavy.
· Do not place the inverter on its connections, as these are not designed to bear its weight. Place the inverter horizontally on the ground.
· When you place the inverter on the ground, place foamed material or paper underneath it in order to protect its housing.
4.7 Installation of the inverter
1 Hold the wall bracket in the desired place and mark the three holes. Put the wall bracket aside and drill the holes.
2 Fasten the rear panel to the wall using the M8*80 screws.

3 Place the inverter in the wall bracket. Secure the inverter to the wall bracket using the Error! Reference source not found..

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31

INSTALLATION

32

SOFAR 25 … 50KTLX-G3

ELECTRICAL CONNECTIONS
5 Electrical connections
5.1 Safety instructions
This topic describes the electrical connections of the inverter SOFAR 25 … 50KTLX-G3. Read this section thoroughly and carefully before connecting the cables.
DANGER Electrical voltage at the DC connections
· Ensure that the DC switch is OFF before establishing the electrical connection. The reason is that the electrical charge remains in the capacitor after the DC switch has been switched off. Therefore, at least 5 minutes must lapse before the capacitor has been electrically discharged.
DANGER Electrical voltage
· PV modules generate electrical energy when exposed to sunlight, and this may present an electrical shock hazard. Therefore, cover the PV modules with an opaque sheet before connecting to the DC input power cable.
NOTE · Open circuit voltage of the PV strings should not exceed 1100 V.

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33

ELECTRICAL CONNECTIONS

ATTENTION Qualification
· The installation and maintenance of the inverter must be carried out by an electrician.

5.2

The connected PV modules must be compliant with IEC 61730 class A.

Model
SOFAR 25KTLX-G3 SOFAR 30KTLX-G3 SOFAR 30KTLX-G3-A SOFAR 33KTLX-G3 SOFAR 36KTLX-G3 SOFAR 40KTLX-G3 SOFAR 45KTLX-G3 SOFAR 50KTLX-G3 SOFAR 40KTLX-G3-HV SOFAR 50KTLX-G3-HV

Max. PV Panel ISC
350 A
450 A 350 A 450 A

Max. AC output current 42.4 A 51.5 A 45.3 A 56.0 A 60.6 A 66.7 A 75.8 A 83.3 A 53.0 A 66.2 A

Electrical connection

The electrical connection is established as follows: 1. Connect PE cable 2. Connect DC input cable 3. Connect AC output power cable 4. Connect communication cable (optional)

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SOFAR 25 … 50KTLX-G3

ELECTRICAL CONNECTIONS
5.3 Connections
CAUTION Damage during transportation
· Please check the product packaging and connections carefully prior to installation.

12 3 4

56

7

8

DC switch

Venting valve

PV input ports (positive) PV input ports (negative)

WiFi/GPRS/Ethernet

COM Port (RS485)

AC output

Fans

5.4 Connecting the PE cables

Connect the inverter to the equipotential bonding bar by using the protective earth cable (PE) for grounding.

SOFAR 25 … 50KTLX-G3

35

ELECTRICAL CONNECTIONS
ATTENTION Pole earthing not permissible!
· As the inverter is transformerless, the plus and minus poles of the PV generator must NOT be earthed. Otherwise, the inverter will malfunction. In the PV system, not all live metal parts (e.g. PV module frames, PV frame, generator connection box housing, inverter housing) require earthing.
1. Remove the insulation of the cable. For outside use, cables of > 16mm² are recommended for earthing).
Note: L2 is 2 to 3 mm longer than L1
2. Crimp the cable to the ring terminal. Recommended OT terminal: OT-M6.

3. Tighten the crimped ring terminal with the M6 screw by using a torque wrench of 5 to 7 Nm:

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SOFAR 25 … 50KTLX-G3

ELECTRICAL CONNECTIONS

Threaded hole OT M6 screw terminal

M6 screw Threaded hole

Ring terminal

5.5 Connecting the DC cables

NOTE · Maximum tolerance voltage 1100 V

Please observe the recommended cable dimensions: · Cu cable cross section: 2.5 … 6 mm2 · Cable outside diameter: 6 … 9 mm

1. Insert the positive and negative DC cables into the corresponding cable glands.

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37

ELECTRICAL CONNECTIONS

Positive DC cable

Negative DC cable

2. Use a crimping plier to crimp the DC cables.

CAUTION Danger of reverse polarity!
· Ensure that the polarity is correct before plugging into the DC connections!

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SOFAR 25 … 50KTLX-G3

ELECTRICAL CONNECTIONS
3. Insert the crimped DC cables into the corresponding connector housing until you hear a “clicking” sound.

Positive

Negative

4. Verify the voltage level of the DC input with a multimeter and ensure that the polarity is correct.

5. Connect the DC connector to the inverter.

Removing the connectors
CAUTION Danger of DC arcing
· Before removing the plus and minus connector, ensure that the DC switch has been set to OFF.

SOFAR 25 … 50KTLX-G3

39

ELECTRICAL CONNECTIONS
In order to remove the plus and minus connection from the inverter, insert a removal key into the locking and press on the key with the adequate force as shown in the following illustration:

5.6 Connecting the AC power cables
Connect the inverter to the AC power distributor or the power grid using AC power cables.
CAUTION AC connection
· Each inverter must have its own circuit breaker. · Do not connect any consumers between the inverter and
circuit breaker! · The AC disconnecting device must be easily accessible.
NOTE · The inverter SOFAR 25 … 50KTLX-G3 has a built-in AFI (univ. sensitive residual current protection). If an external AFI is required, we recommend an AFI type A or B RCD featuring a residual current of 100 mA or more. · Please follow the national rules and regulations for the installation of external relays or circuit breakers!

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SOFAR 25 … 50KTLX-G3

ELECTRICAL CONNECTIONS
Dimensioning For correct installation, five-core outdoor cables should be used. To simplify the installation process, use flexible cables. The recommended cable specifications are listed in the following table.

SOFAR 25 … 50KTLX-G3

41

ELECTRICAL CONNECTIONS

Model SOFAR

Cable cross-section Cu/Al cable Multi-

AC circuit

(mm2)

core

breaker

L/N end

PE end

outdoor specifications cable

(mm)

25KTLX-G3

30KTLX-G3

16.0 … 35.0

16.0

30KTLX-G3-A

63 A/230 V/3P

33KTLX-G3 36KTLX-G3 40KTLX-G3 45KTLX-G3
50KTLX-G3

25.0 … 50.0 35.0 … 70.0

16.0 … 25.0 16.0 … 35.0

80 A/230 V/3P
100 A/230 <50
V/3P 120 A/230
V/3P

40KTLX-G3HV

25…50

16…25

80A/380V/3P

50KTLX-G3HV

35…70

16…35

100A/380V/3P

NOTE · The AC circuit breaker must comply to IN=0.1A · The resistance at connection point must less than 2

You need to use five core outdoor cables, the recommended AC cable and residual current device (RCD) can be used as below table:

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ELECTRICAL CONNECTIONS
If a RCD is required under local regulations, SOFAR recommends a type A or B RCD with sensitivity of 100 mA or higher. Where local electricity code requires an RCD with a lower leakage rating, the discharge current might result in nuisance tripping of the external RCD. SOFAR recommends the following measure in selecting an external RCD to avoid nuisance tripping: 1: Selecting appropriate RCD. 2: Configure the trip current of inverter internal RCD to a lower value that the trip current of the external RCD.

Please choose the high-quality PV cable and ensure the power loss is less than 1%. The inverter AC side to grid connection point must less than 100m. The relationship between the leakage power in the AC cable and the cable length, the cable cross-section, is displayed in the following illustration:

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ELECTRICAL CONNECTIONS

The AC output terminal is equipped with a high-current 5-core terminal block and a customized waterproof cover (IP65). Please follow below steps to connect the AC cable.
5.6.1 Installation instructions
CAUTION Electrical voltage
· Ensure that the grid has been switched off before removing the AC connector.
1. Remove the waterproof cover with a screwdriver, and remove the stopper from the waterproof cable gland;

2. Select the suitable cable according to the table above. Remove the insulating layer of the AC output cable using a wire stripper and in

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SOFAR 25 … 50KTLX-G3

ELECTRICAL CONNECTIONS
accordance with the following illustration, and then guide the cables through the cable gland.

R type terminal

Insulating sleeve

3. Connect the cables to the AC terminal block and tighten the M8 screws (6 … 10 Nm) and M6 screws (5 … 7 Nm). Then tighten the AC cover screws (2 … 3 Nm);

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45

ELECTRICAL CONNECTIONS
NOTE · When an aluminum cable is used, a copper/aluminum conversion terminal is required. This is supplied together with the copper terminals.
5.7 Communication ports
The SOFAR 25 … 50KTLX-G3 inverters come with one of the following two COM ports and one USB port.
12
1:USB Port 2:COM Port

COM port type I 5.7.1 USB port

COM port type II

The USB port can be used to update the inverter’s software version, or for connecting a WiFi-stick or Ethernet cable.

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SOFAR 25 … 50KTLX-G3

ELECTRICAL CONNECTIONS
5.7.2 COM port Please follow below steps to install the COM cable according to the correct COM port (check the corresponding type A or B):

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47

ELECTRICAL CONNECTIONS

Please refer to below table for the specific PIN assignments.

Function

Pin Definition Note

Inverter monitoring and 1 system control
2

RS485 A1-1 RS485 Signal+ RS485 A1-2 RS485 Signal +

3

RS485 B1-1 RS485 Signal –

4

RS485 B1-2 RS485 Signal –

Energy meter port

5

RS485 A2

RS485 Signal +

6

RS485 B2

RS485 Signal –

Grounding

7

GND.S

Signal GND

Logic interface for power 8

control and shutdown

remote 9

10

DRM0 DRM1/5 DRM2/6

Remote shutdown Digital input 1 Digital input 2

11 DRM3/7

Digital input 3

12 DRM4/8

Digital input 4

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5.7.3 Logic Interface: DRMs, Power Control and remote shutdown
The DRM/Logic interface is used to control the inverter by external signals, usually provided from grid operators with ripple control receivers or other means. The logic interface inputs are defined according to different standard requirements. The grid protection relays can trigger the internal grid relays to open within 150 ms.
NOTE · The DRM0 inputs need a 15k resistor in series to the input to feed-in power!
DRMs for AS/NZS 4777.2:2015 and AS/NZS 4777.2:2020
Also known as Inverter Demand Response Modes (DRMs). The inverter recognises all supported Demand Response commands and initiates the reaction within two seconds. The inverter remains in the reduced power mode as long as the input is closed. Supported DRM commands are pre-configured: DRM0, DRM5, DRM6, DRM7, DRM8:

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ELECTRICAL CONNECTIONS

Grid Protection
Rl
GND K0

PIN:

7 8 9 10 11 12

DRM: GND 0 5 6 7 8

PIN:

7 8 9 10 11 12

DRM: GND 0 5 6 7 8

15 k 15 k 15 k 15 k 15 k
GND DRM 5 6 7 8
Ripple Control Receiver

Function Grounding DRMs/Logic Interface

Pin Definition Note

Digital Input

7 GND.S

Signal GND

8 DRM0

Remote shutdown

9 DRM1/5 0% power feed-in DI 5

10 DRM2/6 50% power feed-in DI 6

11 DRM3/7 75% power feed-in DI 7

12 DRM4/8 100% power feed-in DI 8

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Logic interface for VDE-AR-N 4105:2018-11
This function serves to control and/or limit the output power of the inverter. The inverter can be connected to a radio ripple control receiver in order to dynamically limit the output power of all inverters within the system. The inverter remains in the reduced power mode as long as the input is closed.

Grid Protection
Rl
GND K0
15 k

PIN:

7 8 9 10 11 12

DI: GND 0 1 2 3 4

PIN:

7 8 9 10 11 12

DI: GND 0 1 2 3 4

GND K1 K2 K3 K4
Ripple Control Receiver

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ELECTRICAL CONNECTIONS

Function Grounding DRMs/Logic Interface

Pin Definition Note

Digital Input

7 GND.S

Signal GND

8 DRM0

Remote shutdown

9 DRM1/5 0% power feed-in DI 5

10 DRM2/6 30% power feed-in DI 6

11 DRM3/7 60% power feed-in DI 7

12 DRM4/8 100% power feed-in DI 8

Remote Shutdown for EN50549-1:2019/VDE ARN 4105:2018-11
The inverter can be disconnected from the grid within 150 ms by an external signal. To use this function the DRM0 input is used. As long as the input is closed (the 15 k is connected at the input), the inverter feeds-in. As soon as the input is shorted or opened, the inverter disconnects from the grid.
Functional description of the terminal

Function

Pin Definition Note

Grounding

7

GND.S

Signal GND

DRMs/Logic Interface

8

DRM0

Remote shutdown

9

DRM1/5

0% power

NOTE

· The Logic interface has to be activated in the LCD screen of the inverter, or with SOFAR View App:

DRM0 active: Remote Shutdown

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ELECTRICAL CONNECTIONS

DRMn active: active power feed-in limitation function · Also, the power levels in percentage can be adjusted if
needed

5.8 Energy meter connection

To use the feed-in limitation function, a SmartMeter is required to measure the power flow at the point of common coupling (PCC). Please refer to below table for the Pin assignments for the RS485 connection between the inverter and the energy meter.

Inverter COM Port Pin Function

Energy Meter Pin

5

RS485+ (A2)

24

6

RS485- (B2)

25

5.8.1 Feed-in limitation function

With this function, one single inverter can dynamically limit its output power to keep the feed-in power at the point of common coupling (PCC) below a defined setpoint.

To use the feed-in limitation function, an external SmartMeter has to be connected to measure the power flow at the PCC:

SOFAR Part No.

Product

Smart Meter (3-phase, 901.00000048-1
CT’s)

Type Chint DTSU666 1,5(6)A

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ELECTRICAL CONNECTIONS

Smart Meter (3-phase 901.00000058-0
inline)

Chint DTSU666 5(80)A

NOTE · The arrow of the CT’s must point to the grid

There is different feed-in limitation modes available, which can be set in the LCD screen menu:

“Feed-in Limit” menu

Feed-in Control Hard Feed-in Control Ctrl. Total Power

Standard Mode. In case of a communication error with the SmartMeter, the inverter limits its output power to the setpoint. When the Hard Feed-in Control is activated, the inverter shuts down whenever the setpoint is exceeded Limit the power of the feeding-in phases to the setpoint. Ignore the

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ELECTRICAL CONNECTIONS

Ctrl. Phase Power Ctrl. Selling Power

phases where energy is bought from the grid (standard-setting) Limit the feed- in power of the sum of all phases to the setpoint (i.e. Germany) Limit the feed-in power of each phase to 1/3 of the setpoint

5.9 System monitoring
The SOFAR 25 … 50KTLX-G3 inverters provide various communication methods for the system monitoring: RS485 or WiFi stick (standard), GPRS or Ethernet stick (optional).
5.9.1 RS485 network
You can connect RS485-linked devices to your PC via an RS485 USB adapter or connect them to a data logger.
NOTE · The RS485 line may not be any longer than 1000 m · Assign each inverter its own modbus address (1 to 31) via the LCD display · At the last inverter, put a termination resistor of 120 Ohm between RS485+ and RS485-

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ELECTRICAL CONNECTIONS

5.9.2 WiFi-, GPRS-, Ethernet stick
When you have installed the stick logger, the inverters can directly upload your operating, energy and alarm data in the SolarMAN monitoring portal.

NOTE · The Stick Loggers are using the outgoing TCP port 10000, which could be blocked in some internet routers

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ELECTRICAL CONNECTIONS

5.9.3 Configuration of the WiFi stick via the web browser
Preparation: The WiFi stick is installed in accordance with the previous section and the SOFAR inverter must be in operation. Carry out the following steps in order to configure the WiFi stick: 1 Connect your PC or smartphone with the WiFi network of the WiFi
stick. The name of this WiFi network is “AP”, followed by the serial number of the WiFi stick (see rating plate). When you are prompted for a password, you can find it on the label of the WiFi stick (PWD). 2 Open an Internet browser and enter the address 10.10.100.254. Recommended browsers: Internet Explorer 8+, Google Chrome 15+, Firefox 10+ 3 Enter the username and password, which are both set to “admin” by default. The “Status” page will be opened. 4 Click on the “Wizard” in order to configure the WiFi stick for Internet access. Result The WiFi stick begins to send data to SolarMAN.
Register your system at the website home.solarmanpv.com. For this, enter the serial number found on the stick logger. Installers use the portal at pro.solarmanpv.com
5.9.4 Setting up the WiFi stick with the app
To download the app, search for “SOLARMAN” in the Apple or Google Play store, or use the following QR codes:

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57

ELECTRICAL CONNECTIONS · SOLARMAN Smart (for end customers):

· SOLARMAN Business (for installers):

Configuration steps
1 After starting the app, register as a new user or enter the current SOLARMAN access data.
2 Create a new system and save the system data. 3 Scan the barcode of the stick logger to assign an inverter to the
system. 4 Go to the newly created system in order to configure the stick
logger (device/logger) 5 Press the button on the WiFi stick for 1 second to activate the WPS
mode of the stick so that the smartphone can be connected to the WiFi stick.

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6 Now, select your local WiFi network for Internet access and enter your WiFi password.
7 The WiFi stick is configured with the access data.

WiFi stick status

The LEDs on the WiFi stick provide information regarding the status:

LED Status

Description

NET:

Communication with the router

On: Connection to server successful
Flashing (1 sec.): Connection to router successful

Flashing (0.1 sec.): WPS mode active

Off: No connection to router

COM

Communication with inverter

Flashing (1 sec.): Communication with inverter

On: Logger connected to inverter

Off: No connection to inverter

READY Logger status

Flashing (1 sec.): Normal status

Flashing (0.1 sec.): Reset running

Off: Error status

Reset button Keystroke 1 sec.

Description WPS mode

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ELECTRICAL CONNECTIONS

Keystroke 5 sec. 10 sec.

Description Restart Restart (reset)

5.9.5 Setting up the Ethernet stick

The Ethernet stick is delivered with DHCP as standard, so it automatically gets an IP address from the router. If you wish to set up a fixed IP address, connect a PC to the Ethernet stick and open the configuration page via the web address 10.10.100.254.

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COMMISSIONING THE INVERTER
6 Commissioning the inverter
6.1 Safety test before commissioning
ATTENTION Check the voltage range · Ensure that the DC and AC voltages are within the permissible range of the inverter.
6.2 Starting the inverter
1. Switch on the DC switch. 2. Switch on the AC circuit breaker. When the DC output generated by the solar system is at a sufficient level, the inverter starts automatically. A correct operation is indicated by the screen displaying “normal”.
If the inverter displays an error message, consult chapter 8 for help.
NOTE · Different distribution network operators in various countries have differing requirements for the grid connection of grid-coupled PV inverters. · Ensure that you have selected the correct country code according to regional authority requirements, and consult a qualified electrician or employees of electrical safety authorities.

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COMMISSIONING THE INVERTER

· SOFARSOLAR is not responsible for the consequences of selecting the incorrect country code.
· The selected country code influences the device grid monitoring. The inverter continuously checks the set limits and, if required, disconnects the device from the grid.
6.3 Smartphone app SOFAR View
The app is available for Android and iOS systems and allows for easy initial setup as well as advanced configurations.

Download link: iOS

Android

After switching on the inverter, the app finds the unit via Bluetooth under its serial number. The app password for the installation is 6868, for the end customer 8888.
NOTE · If the Bluetooth connection does not work, please carry out a firmware update of the inverter.

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OPERATION OF THE DEVICE
7 Operation of the device
This chapter describes the LCD and LED displays of the SOFAR 25 … 50KTLX-G3 inverter.
7.1 Control panel and display field
7.1.1 Buttons and display lights

Buttons Button

Name Up

Down

Description
Short press: Select previous menu item Long press: Exit menu or current interface
Short Press: Select next menu item Long press: “Enter” button

LED’s

Normal (green) illuminates: “Normal” state

flashes: “Wait” or “Check” state

Alarm (red) illuminates: “Error”

GFI (red)

illuminates: GFCI faulty

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OPERATION OF THE DEVICE
7.2 Standard display
This shows a rolling display of the DC voltage/current (PV1), energy yields (today/total), grid voltage and current, as well as the status.

7.3 Status display

The following table displays the various statuses and their meanings:

Status

Description

Initialisation

The control software is started

Wait

Connecting criteria are checked. The voltage and frequency limits must be within the defined range for a specific duration in accordance with the selected country code.

Check

The inverter checks the insulation resistance, relays and other safety requirements. It will also carry out a self-test to ensure that its software and hardware are functioning faultlessly. If an error or a fault occurs, the inverter will go into the “Error” or “Continuous” state.

Normal

The inverter goes into the “Normal” state, and feeds current into the grid

Fault

The inverter goes into the “Fault” state if an error or a fault occurs. It is normally reset automatically by the inverter.

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OPERATION OF THE DEVICE

Status Permanent

Description
Repeated errors can lead to a permanent error which needs investigation and problem solving on site.

7.4 Menu structure
Hold the down button to show the main menu. Main menu

1. Enter Settings

See “Feed-in Limit”

2. Event list
3. System Info i fo ti 4. Display time

See “Set country codes” See Syst for See Display time

5. Software update See Software update

“Settings” menu 1. Set time 2. Clear energy
3. Clear events
4. Country Code

Sets the system time for the inverter Deletes the total energy yield of the inverter Deletes the historical events recorded in the inverter Sets the country and standard applicable to the current application conditions and requirements. Before setting this, ensure that the

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OPERATION OF THE DEVICE
5. On/off control 6. Set Energy 7. Set address
8. Set input mode 9. Set language 10. Set Feed-in Limit
11. Logic interface 12. IV Curve scan 13. PCC select 14. Feed-in limit mode (please refer to 5.8)

“Activate country setting” option has

been activated.

Local control of inverter

Sets the total power generation.

Enter the Modbus address (when

several

inverters

require

simultaneous monitoring), standard:

01

Either parallel mode or independent

mode may be selected.

Sets the display language of the

inverter

Through this function the feed-in

limitation function can be enabled or

disabled.

Activates or deactivates logical

interfaces.

Through this function, the peak point

of maximum power can be tracked.

Select either PCC Meter (default) or

PCC ARPC.

Select from below:

Feed-in Control / Hard Feed-in

Control

Ctrl. Total Power (default)

Ctrl. Phase Power

Ctr. Selling Power

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OPERATION OF THE DEVICE

NOTE · The Autotest function is only applicable in Italy. Please contact SOFARSOLAR for the specific steps.

Password

Several settings require a password to be entered (the standard password is 0001). When entering the password, press briefly to change the figure and press and hold to confirm the current figure. Event list menu The event list is used to display the real time event recordings, including the total number of events and each specific ID no. and event time. The most recent events are listed at the top.

2. Event list 1. Current event Fault information

2. Event “History
001 ID04 06150825 (display of the event sequence number, event ID number and time that the event takes place)

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OPERATION OF THE DEVICE
System information menu 1. Inverter type 2. Serial number 3. Soft version 4. Hard version 5. Country 6. Modbus address 7. Input mode
Display time Displays the current system time. Software update The user can update the software via the USB flash drive. SOFARSOLAR will provide the firmware update when it is required.
7.5 Software update
1. Switch the DC and AC switches off and then remove the communication cover. If an RS485 line has been connected, ensure that the nut is loosened. Ensure that the communication line is not energised. Remove the cover to prevent the connected communications connector from becoming loose.
2. Insert the USB stick into the computer. 3. SOFARSOLAR will send the firmware update to the user. 4. Unzip the file and copy the original file to a USB stick. Attention:
The firmware update file must be in the “firmware” subfolder!

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OPERATION OF THE DEVICE
5. Insert the USB flash drive into the USB interface of the inverter. 6. Switch on the DC switch and go to menu item “5. Software update”
on the LCD display. 7. Enter the password (the standard password is 0715). 8. The system will then successively update the main DSP, auxiliary
DSP and ARM processors. Pay attention to the displays. 9. If an error message appears, switch off the DC switch and wait
until the LCD screen goes out. Then, switch the DC switch back on and proceed with the update from step 5. 10. After the update is complete, switch the DC switch off and wait until the LCD screen goes out 11. Re-establish a watertight communication connection 12. Switch the DC and AC circuit breaker back on 13. You can check the current software version in item “3. Software version” of the SystemInfo menu.

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TROUBLESHOOTING HANDLING
8 Troubleshooting handling
8.1 Troubleshooting
This section contains information and procedures pertaining to the remedying of potential problems with the inverter. To carry out troubleshooting, proceed as follows: · Check the warnings, error messages or error codes displayed on
the screen of the inverter. If no error information is displayed on the screen, check whether the following requirements have been fulfilled: · Has the inverter been set up in a clean, dry, well-ventilated area? · Is the DC switch set to ON? · Are the cables sufficiently dimensioned and short enough? · Are the input connections, output connections and the wiring all in
good condition? · Are the configuration settings for the relevant installation correct? · Are the display field and the communication cables correctly
connected and undamaged? Please proceed as follows to display the recorded problems: Hold the button down to bring up the main menu of the standard interface. Select “2. Event list” and hold the button down to bring up the event list.

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Earth fault alarm This inverter is compliant with IEC 62109-2 Clause 13.9 for earth fault protection. If an earth fault alarm occurs, the error is displayed on the LCD screen, the red light illuminates and the error can be found in the error history log.

NOTE · In the case of devices equipped with a stick logger, the alarm information can be viewed on the monitoring portal and retrieved via the smartphone app.

ID Name 01 GridOVP 02 GridUVP 03 GridOFP 04 GridUFP

Description

Solution

The voltage of the power If the alarm occurs occasionally,

grid is too high

then the reason may be the power

grid. The inverter automatically The voltage of the power
returns to its normal operating state grid is too low
when the power grid is back to

The grid frequency is too normal.

high

If the alarm is occurring frequently,

check whether the grid The grid frequency is too
voltage/frequency is within a low
permissible range. If it is, check the

AC circuit breaker and the AC cables

of the inverter.

If the alarm occurs repeatedly,

contact the technical support

department in order to adjust the

voltage and frequency limits after

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TROUBLESHOOTING HANDLING

ID Name

Description

Solution

you have obtained the approval of the local power grid operator.

05 PVUVP

The input voltage is too low Check whether too few PV modules have been switched in series and correct this if required. The inverter automatically returns to its normal operating state.

06 Vlvrtlow 07 Vovrthigh

LVRT function disrupted OVRT function disrupted

Check whether the grid voltage is fluctuating strongly.

09 PVOVP

The input voltage is too Check whether too many PV

high

modules have been switched in

series and correct this if required.

The inverter automatically returns

to its normal operating state

10 IpvUnbalance Input current is not Check the setting of the MPPT input

symmetrical

mode (parallel mode/independent

11 PvConfigSet Incorrect MPPT mode Wrong

mode) of the inverter and correct it as well if required.

12 GFCIFault Earthing error

If the error occurs occasionally, then external factors may be to blame. The inverter automatically returns to its normal operating state. If the error occurs frequently and lasts for a prolonged period, check whether the insulation resistance between the PV generator and earth (ground) is too low and examine the PV cable insulation.

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TROUBLESHOOTING HANDLING

ID Name

Description

Solution

14 HwBoostOCP The input current is too Check whether the input current is

high and has triggered the higher than the maximum

hardware protection

permissible input current of the

inverter. Check the input cables. If

both are correct, please contact the

technical support department.

15 HwAcOCP

The grid current is too high and has triggered the hardware protection

16 AcRmsOCP The grid current is too high

HwADFaultIG Grid current measurement

17

rid

error

HwADFaultD DC current measurement

18 CI

error

ID15-ID24 are internal errors of the

inverter. Switch the DC switch OFF,

19 HwADFaultV Grid voltage measurement wait 5 minutes and then switch the

Grid

error

DC switch ON. Check whether the

GFCIDeviceF

error has been rectified. If not,

20 ault

GFCI measurement error please contact the technical support

department.

21 MChip_Fault Master chip error

HwAuxPower

22

Auxiliary voltage error

Fault

BusVoltZeroF Bus voltage measurement

23

ault

error

IacRmsUnbal The output current is not

24

ance

balanced

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TROUBLESHOOTING HANDLING

ID Name

Description

Solution

25 BusUVP

The DC bus voltage is too If the configuration of the PV

low

generator is correct (no ID05 error),

the possible cause may be linked to

insufficient sunlight. The inverter

automatically returns to its normal

operating state when the level of

sunlight is back to normal.

26 BusOVP

The bus voltage is too high ID26-ID27 are internal errors of the

inverter. Switch the DC switch OFF, 27 VbusUnbalan The bus voltage is not
wait 5 minutes and then switch the balanced
DC switch ON. Check whether the

error has been rectified. If not,

please contact the technical support

department.

28 DciOCP

The DC current is too high Check the setting of the MPPT input mode (parallel mode/independent mode) of the inverter and correct if required.

29 SwOCPInstan The grid current is too high Internal inverter error, switch the DC switch OFF, wait 5 minutes and then switch the DC switch ON. Check whether the error has been rectified. If not, please contact the technical support department.

30 SwBOCPInst The input current is too Check whether the input current is

ant

high

higher than the maximum

permissible input current of the

inverter, then check the input

cables. If both are correct, please

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TROUBLESHOOTING HANDLING

ID Name

Description

Solution

contact the technical support department.

33 Overload

Reflux overload timeout

Check whether the power is outside the permissible range. If so, set the power to the correct range.

49 ConsistentFa The sample value of the

ult_VGrid

grid voltage between the

master DSP and the slave

DSP is not consistent.

50 ConsistentFa The sample value of the

ult_FGrid

grid frequency between the

master DSP and the slave

DSP is not consistent

51 ConsistentFa The sample value of the ID49-ID55 are internal errors of the

ult_DCI

DCI between the master inverter. Switch the DC switch OFF,

DSP and the slave DSP is wait 5 minutes and then switch the

not consistent

DC switch ON. Check whether the

52 ConsistentFa The sample value of the error has been rectified. If not,

ult_GFCI

GFCI between the master please contact the technical support

DSP and the slave DSP is department.

not consistent

53 SpiCommLos The SPI communication

e

between the master DSP

and the slave DSP is faulty

54 SciCommLos The SCI communication

e

between the control board

and communications board

is faulty

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TROUBLESHOOTING HANDLING

ID Name

Description

Solution

55 RelayTestFail Grid relay error

56 PvIsoFault The insulation resistance is Check the insulation resistance

too low

between the PV generator and earth

(ground), and rectify the error in the

event of short-circuiting.

57 OverTempFa The temperature of the Ensure that the mounting position

ult_Inv

inverter is too high

and method both comply with the

necessary requirements.

58 OverTempFa The DC/DC booster

Check whether the ambient

ult_Boost

temperature is too high

temperature at the installation

59 OverTempFa The ambient temperature location exceeds the upper limit

ult_Env

is too high

value. If so, improve the ventilation

in order to reduce the temperature.

65 UnrecoverHw The grid current is too high ID65-ID70 are internal inverter

AcOCP

and has caused an errors, switch the DC switch OFF,

unrectifiable hardware wait 5 minutes and then switch the

error

DC switch ON. Check whether the

error has been rectified. If not,

66 UnrecoverBu The bus voltage is too high

please contact the technical support

sOVP

and has caused an

department.

unrectifiable error

67 UnrecoverIac The grid current is

RmsUnbalan unsymmetrical and has

ce

caused an unrectifiable

error

68 UnrecoverIpv The input current is Unbalance unsymmetrical and has caused an unrectifiable error

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TROUBLESHOOTING HANDLING

ID Name

Description

Solution

69 UnrecoverVb The bus voltage is usUnbalance unsymmetrical and has caused an unrectifiable error

70 UnrecoverOC The grid current is too high

PInstant

and has caused an

unrectifiable error

71 UnrecoverPv Incorrect input mode ConfigSetWr ong

Check the setting of the MPPT input mode (parallel mode/independent mode) of the inverter and correct if required.

74 UnrecoverIPV The input current is too ID74-ID77 are internal inverter

Instant

high and has caused an errors, switch the DC switch OFF,

unrectifiable error

wait 5 minutes and then switch the

DC switch ON. Check whether the 75 UnrecoverWR The EEPROM cannot be
error has been rectified. If not, ITEEEPROM recovered
please contact the technical support

76 UnrecoverRE The EEPROM cannot be department.

ADEEPROM recovered

77 UnrecoverRel The grid relay has a

ayFail

permanent error

81 OverTempDe The inverter has derated Ensure that the installation position

rating

itself due to the and method both comply with the

temperature being too high necessary requirements of this user

manual. Check whether the ambient

temperature at the installation

location exceeds the upper limit

value. If so, improve the ventilation

in order to reduce the temperature.

SOFAR 25 … 50KTLX-G3

77

TROUBLESHOOTING HANDLING

ID Name

Description

Solution

82 OverFreqDer The inverter has derated The inverter automatically reduces

ating

itself due to the grid the output power when the

frequency being too high frequency of the electrical grid is too

high. Ensure that the grid frequency

is within the permissible range.

83 RemoteDerat The inverter has derated The inverter logs ID83 when the

ing

itself through the remote remote power is reduced. Check the

control

wiring of the remote control input

and output signal connection on the

communication board

84 RemoteOff The inverter was switched The inverter logs ID84 in the event

off through the remote of a remote switch-off. Check the

control

wiring of the remote control input

and output signal connection on the

communication board

85 UnderFreque The inverter has derated The inverter automatically reduces

ncyDerating itself due to a low grid the output power when the

frequency

frequency of the electrical grid is too

low. Ensure that the grid frequency

is within the permissible range.

89 UnderFreqUp Underfrequency Power

Ensure that the grid frequency is within the permissible range.

93 Lightning protection alarm

The overvoltage protection Check whether the device is

has been triggered

damaged and contact the technician

for assistance.

94 Softwareversi The the control board and Contact the technical support

onisnotconsis communications board department in order to upgrade the

tent

software is not consistent software.

78

SOFAR 25 … 50KTLX-G3

TROUBLESHOOTING HANDLING

ID Name

Description

Solution

95 Communicati The EEPROM of the ID95 … ID96 are internal errors of

onboardEEPR communications board is the inverter. Switch the DC switch

OMfault

faulty

OFF, wait 5 minutes and then switch

the DC switch ON. Check whether

96 RTCclockchip The RTC clock chip is

the error has been rectified. If not,

anomaly

faulty

please contact the technical support

department.

97 Invalid Country

The country is invalid

Check the country setting and correct if required.

98 SDfault

The SD card is defective Please replace the SD card.

8.2
8.2.1 8.2.2

Maintenance
Inverters do not generally require daily or routine maintenance. Before carrying out cleaning, ensure that the DC switch and AC circuit breaker between the inverter and power grid have been switched off. Wait at least 5 minutes before carrying out cleaning.
Cleaning the inverter
Clean the inverter using an air blower and a dry, soft cloth or a soft bristle brush. Do NOT clean the inverter with water, corrosive chemicals, cleaning agents etc.
Cleaning the heat sink
In order to help guarantee correct long-term operation of the inverter, make sure that there is sufficient space for ventilation around the heat sink. Check the heat sink for blockages (dust, snow etc.) and remove them if present. Please clean the heat sink using an air blower and a dry, soft cloth or a soft bristle brush. Do NOT clean the heat sink with water, corrosive chemicals, cleaning agents etc.

SOFAR 25 … 50KTLX-G3

79

TROUBLESHOOTING HANDLING
8.2.3 Fan maintenance Fans must be cleaned and maintained regularly for both performance and safety concerns. ATTENTION Regularly clean or maintain · Broken or faulty fans may cause cooling issues, which may lead to limited heat dissipation and a lower working efficiency of the inverter.
Please follow below steps for maintenance: 1 Check the connections to ensure all electric connections are
turned off.
2 Unscrew the six screws at the four corners of the fan housing:

3 Unscrew the screws at the fan position, unplug the terminals at the interface between the fan and the inverter and then remove the fan:

80

SOFAR 25 … 50KTLX-G3

TROUBLESHOOTING HANDLING
4 Use a soft brush to clean the fan. In case of damage, ensure to replace it in time.
5 Reinstall the inverter according to the above steps.

SOFAR 25 … 50KTLX-G3

81

TECHNICAL DATA

9 Technical data

Datasheet

SOFAR 25KTLX-
G3

SOFAR 30KTLX-
G3

SOFAR 33KTLX-
G3

SOFAR 36KTLX-
G3

SOFAR 40KTLX-
G3

SOFAR 45KTLX-
G3

SOFAR 50KTLX-
G3

Input (DC)

Recommended max. PV input power (Wp)
Max. DC power for single MPPT (W)
Number of MPP trackers
Number of DC inputs

37500

45000

49500

54000

60000

25000

3 2 for each MPPT

67500 4

75000

Max. input voltage (V)

1100

Start-up voltage (V)

200

Rated input voltage (V)
MPPT operating voltage range (V)
Full power MPPT voltage range (V)
Max. input MPPT current (A)
Max. input short circuit current per MPPT (A)

620 180 ­ 1000

480 ­ 850

510 ­ 850 540 ­ 850 480 ­ 850 510 ­ 850 540 ­ 850

3*40

4*40

3*50

4*50

Output (AC)

Rated power (W)

25000

30000

33000

36000

40000

45000

50000

Max. AC power (VA)

28000

34000

37000

40000

44000

50000

55000

Max. output current (A)

42.4

51.5

56.0

60.6

66.7

75.8

83.3

Rated grid voltage

3 / N / PE, 230 / 400

Grid voltage range

310 ­ 480 Vac (according to local standard)

82

SOFAR 25 … 50KTLX-G3

Rated frequency Grid frequency range Active power adjustable range THDi Power factor
Performance
Max. efficiency European weighted efficiency Protection DC reverse polarity protection Anti-islanding protection Leakage current protection Ground fault monitoring PV-array string fault monitoring Feed-in limitation function DC switch Input / output SPD
Communication Standard communication mode General Data
Ambient temperature

TECHNICAL DATA
50 Hz / 60 Hz 45 ­ 55 Hz / 55 ­ 65 Hz (according to local standard)
0 ­ 100% < 3%
1 default (adjustable +/-0.8)

98.60%

98.20%

98.80%

Yes Yes Yes Yes Yes Yes Yes PV: type II standard, AC: type II standard
RS485 / WiFi / Bluetooth, optional: Ethernet
-30 ­ 60

SOFAR 25 … 50KTLX-G3

83

TECHNICAL DATA

range Self-consumption at night (W) Topology Degree of protection Allowable relative humidity range Max. operating altitude Noise Weight (kg) Cooling Dimension (mm) Display Warranty Standard EMC Safety standards
Grid standards

<3

Transformerless IP65

0 ­ 100%

4000 m

< 60 dB

36

37

Fan

585480220

LCD, App via Bluetooth

10 years, optional: up to 20 years

EN 61000-6-1, EN 61000-6-2, EN 61000-6-3, EN 61000-6-4
IEC 62109-1/2, IEC 62116, IEC 61727, IEC 61683, IEC 60068(1,2,14,30), IEC 60255 VDE V 0124-100, V 0126-1-1, VDE-AR-N 4105, CEI 0-21/CEI 0-16, UNE 206 007-1, EN 50549, G98/G99, EN 50530

84

SOFAR 25 … 50KTLX-G3

Shenzhen SOFARSOLAR Co., Ltd. 11/F, Gaoxinqi Technology Building, District 67, XingDong Community, XinAn Street,
Bao’An District, Shenzhen, China
SOFARSOLAR GmbH Krämerstrasse 20 72764 Reutlingen Germany
Email: service.uk@sofarsolar.com Web: www.sofarsolar.com

References

• home.solarmanpv.com
• home.solarmanpv.com/
• pro.solarmanpv.com
• pro.solarmanpv.com/
• SOFAR-Energy to Power Your Life
• SOFAR-Energy to Power Your Life
• Welcome to SOFAR Europe – Energy to Power your Life

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