Koyoe KY-EST12KH 3 Phase Hybrid Inverter User Manual

Koyoe KY-EST12KH 3 Phase Hybrid Inverter

All Rights Reserved

• No part of this document can be reproduced in any form or by any means without the prior written permission of Jiangsu KOYOE Energy Technology Co., Ltd(hereinafter “KOYOE”).

Trademarks Rights

• The logo and other KOYOE trademarks used in this manual are owned by Jiangsu KOYOE Energy Technology Co., Ltd.
• All other trademarks or registered trademarks mentioned in this document are owned by their respective owners.

Software Copyrights

• It is prohibited to use data contained in firmware or software developed by KOYOE, in part or in full, for commercial purposes by any means.
• It is prohibited to perform reverse engineering, cracking, or any other operations that compromise the original program design of the software developed by Jiangsu KOYOE Energy Technology Co., Ltd.
• The manual mainly introduces product information, installation guide, operation and maintenance. This manual cannot contain complete information about photovoltaic systems. You can find more information about other devices at www.koyoe.com or on the relevant component manufacturer’s web pages.

Scope of application

• This manual is valid for the following inverter models:
• KY-EST12KH
• KY-EST15KH
• KY-EST17KH
• KY-EST20KH
• They will be referred to as “inverter” hereinafter unless otherwise specified.

How to Use the Manual

• Before using or operating the inverter, please read this manual and other relevant documents carefully.
• The contents in this manual are owned by Jiangsu KOYOE Energy Technology Co., Ltd., and shall not be reproduced or published in any form without the prior written permission of our company.
• The contents of the manual may be periodically updated or revised as a result of product development. Information in this manual is subject to change without prior notice. The latest handbook is available at www.koyoe.com.

System Introduction

• KY-EST12KH/ KY-EST15KH/ KY-EST17KH/ KY-EST20KH series inverter, also known as hybrid or bidirectional solar inverter, is suitable for energy management of photovoltaic, battery, load, power grid and other solar energy systems. Electricity from the photovoltaic panels is used for residential electricity, and excess power can be stored in batteries. When the battery is fully charged, users can send excess power to the utility grid.
• When the photovoltaic power is not enough to meet the user’s load demand, the battery will discharge to the load. If there is not enough energy stored in the battery, the grid will supply power to the load through the system.
• The inverter with no transformer topology, and there is no isolation between DC input and AC output. The adaptive PV model must meet IEC61730 Class A. The energy management system is shown in Figure 1-1.

Warning!

• For the TT utility grid, the N line voltage to ground must be 30V or less.
• The maximum power of home load and EPS load must be less than the rated power of inverter.

Product Introduction

Inverter Introduction

Model Description
The inverter model description is as follows (Take KY-EST20KH as an example ):

Appearance
The following figure shows the inverter appearance, which is for reference only. The actual product that you receive may differ.

Be careful!
This inverter contains a PV switch. For safety reasons, it is recommended to have a DC switch between the PV array and the inverter PV input terminals (mandatory in some countries).

Dimensions

The following figure shows the dimensions of the inverter. See Figure 1-4 and the following table for the description of LCD panel.

inverter

is in normal mode, the LED will always be bright

2| COM LED(Yellow)| When the inverter communicates through WIFI,GPRS and upper

computer, the LED flashes

3| ALARM LED(Red)| When an alarm occurs, the LED flashes. When the inverter fails, the LED will always be on
---|---|---
4| LCD Screen| To display the information
5| ESC Key| Exit the current menu
6| Up Key| Page up or move cursor
7| Down Key| Page down or move cursor
8| Enter Key| Enter the current menu

Energy Meter

• The Energy Meter is installed next to the grid main switch to detect the electrical measured values at the grid-connected point. It communicates with the inverter via an RS485 connection.
• The dimensions are shown below. Please refer to the wiring guide for electricity meters.

Safety Instructions

The inverter is strictly complying with the relevant safety regulations of product design and testing. In order to use this product more safely and reliably, the following lists the information related to different categories of safety. In the process of installation, operation and maintenance, please carefully read and observe the instructions and precautions of the inverter, otherwise it will cause loss of personal and property.

NOTICE!

• The safety instructions in this manual cannot cover all the precautions that should be followed. Perform operations considering actual on site conditions.
• KOYOE shall not be held liable for any damage caused by violation of the safety instructions in this manual.

PV Panels

• Users must ask professionals to install the photovoltaic panels according to the user manual. Please pay attention to the following matters during installation:
• Photovoltaic panels generate electricity when they are exposed to sunlight and can cause fatal voltages and shocks.
• The inverter is a multi-power system. Operators must wear appropriate personal protective equipment: safety helmet, insulation wire, gloves, etc.
• The operator must use measuring equipment to ensure that the output cable of the PV panel is free of voltage before contacting it.
• All the warnings on the PV panel and in its manual must be followed.

Warning!

• The inverter must only be operated with PV strings of protection class II in accordance with IEC 61730, application class A.
• It is not permitted for the positive pole or the negative pole of the PV strings to be grounded.
• Damages to the product due to a faulty or damaged PV installation are not covered by warranty.

Utility Grid

• Please comply with the relevant regulations of power grid.

Be careful!

• All electrical connections must comply with local and national standards.
• Only with the permission of the utility grid, the inverter can be connected to the utility grid.

Battery

• Please use the battery recommended by our company and pay attention to the following：

DANGER!

• A short circuit or incorrect installation of a battery can release energy and may result in a combustion or fire hazard.
• There may be fatal voltage in the battery terminals and cables of the inverter. Contact with the cables and terminals in the inverter may cause serious personal injury or even death.

Warning!

• Provide sufficient ventilation for the battery system to prevent flames and sparks from the explosive hydrogen gas that the batteries release.

Due to the dangers of hydrogen gas and battery electrolyte:

• locate batteries in a designated area, complying with the local regulations.
• protect the enclosure against destruction.
• do not open or deform the battery.
• whenever working on the battery, wear suitable personal protective equipment (PPE) such as rubber gloves, rubber boots and goggles.
• rinse acid splashes thoroughly with clear water for a long time and consider consulting a doctor.

Warning!

• Improper settings or maintenance can permanently damage the battery.
• Incorrect inverter parameters will lead to the premature aging of battery.

Inverter

DANGER!

• Improper handling can be a danger of electric shock.
• Do not open the shell at any time. Opening the shell without authorization will not continue to enjoy the warranty.

Warning!

• Inverter operation is prohibited improper operation.
• Do not pull out PV connectors, AC connectors and battery connectors when the inverter is running.
• When turning off the inverter, all power supplies of the inverter, including PV, grid and batteries, must be turned off and wait 10 minutes before operating the inverter.
• Before pulling out any connectors, you must ensure that the connectors have no voltage or current.

Warning!

• After completion of installation, all safety instructions, warning labels and nameplates on the inverter must meet the following conditions:
• Must be clearly legible.
• Should not be removed or covered.

Warning!

• Risk of burns due to hot components .
• Do not touch any hot parts (such as heat sinks) during operation.
• Only the LCD panel and the DC switch can safely be touched at any time.

Warning!

• Only professionals can change the type Settings of safety regulations.
• Unauthorized changes to safety regulations lead to damage of the inverter will not enjoy warranty service.
• Please be aware of the risk of static electricity from damaging the inverter.
• Do not disassemble the inverter and contact the internal devices.
• Connectors that contact the inverter directly while the inverter is running are prohibited.

Warning Label

Attention!

1. When connecting the input and output of the inverter, it is necessary to connect the ground wire of the inverter first, and then connect the DC input and AC output. When disconnecting the inverter wiring, the inverter ground wire must be finally disconnected.
2. Need permission from the local utility prior to connecting the inverter to the utility grid and hire qualified personnel.
3. Observe all documentation that accompanies the inverter.
4. Installations maintenance and installed should be carried out by competent persons, who have sufficient skills and training to apply safe methods of work to install.
5. There is no maintainable part in the inverter. If there is any problem, it must be maintained by professionals.
6. All electrical installations must be done in accordance with the National Wiring Rules of Standard and local code 62109.
7. Non-isolated inverters : the PV modules should have an IEC61730 Class A rating.
8. Inverters may be over 20kg. Please be careful when handling and lifting. Equipment or parts weighing more than 18 kg shall be equipped with lifting and handling tools or as indicated in the manufacturer’s documentation.
9. Software version information can be read by LCD or the upper computer software.
10. The inverter is non-isolated between DC input and AC output. Product identification must be clearly visible after installation.
    •  Risk of Electric Shock, Do Not Remove Cover. No User Serviceable Parts Inside. Refer Servicing To Qualified Service Personnel.
    • When the photovoltaic array is exposed to light, it supplies a dc voltage to this equipment.
    • Please note that PV input voltage must be less than 1000V . Too high voltage could cause damage to the inverter.
11. Please avoid direct sunlight to the inverter.
12. When the inductive load of the electric model is connected to the off-grid port, please note that the instantaneous peak current of load starting shall not be greater than two times of the RMS current of different models（12KW-36A,15KW-44A,17KW-50A,20KW-62A）.

Skills of Qualified Personnel

• All installation of the inverter shall be carried out by professionals, and the following conditions shall be met:
• Have received training on installation, commissioning and hazard management of electrical system;
• Be familiar with the contents of this manual and other relevant documents;
• Know local regulations.

Energy Management

Depending on your configuration and layout, the inverters usually have the following operation modes:

1. Self use(It is necessary to connect the Grid and save it after power failure)
2. Forced Charging(It is necessary to connect the Grid and not save it after power failure)
3. Forced Discharge(It is necessary to connect the Grid and not save it after power failure)
4. Peak Shaving
5. Maintenance
6. Emergency Charging
7. Off Grid

The user can set the inverter to the above working modes according to the actual needs. The detailed mode settings and functions are described as follows:
Self Use

The energy generated by the photovoltaic system shall first meet its own load consumption, then the excess energy is used to charge the battery, and finally the remaining energy can limit the power fed into the power grid by setting and adjusting the power of the network, as shown in the figure below:

The mode setting process is as follows:

1. Press “ENTER” in the main interface to enter the following menu, and then press “UP” and “DOWN” to select “setting”.
2. Press “ENTER” in the above interface to enter the following menu, and then press “UP” and “DOWN” to select “Mode setting”.
3. Press the “ENTER” button in the above interface to enter the password interface, as shown in the following menu. The default password is “1001”. Press the “ENTER” button to select the cursor and add or subtract the value through the “UP” and “DOWN” buttons, then press the ENTER” button again to confirm the value at the optical mark, then move the cursor to “OK”, and press “ENTER” to confirm the input.
4. In the above interface, after entering the password, press the “ENTER” key to enter the following menu. The interface will display the current working mode. Press the “ENTER” key to select the required working mode through the “UP” and “DOWN” keys. Press the “ENTER” key again to confirm the selected mode, move the cursor to “OK”, and press the “ENTER” key to confirm the input.
5. After the above operations, press the “ESC” key to return to the main interface to observe the operation state after changing the mode.

Forced Charging

• This mode must take effect after being connected to the grid. In the forced charging mode, the inverter selects the appropriate power to charge the battery according to the allowable charging current of BMS and the calculated value of energy management.
• When the SOC is charged to the upper limit or the working mode is changed, it exits the forced charging mode.
• In mode selection, please select the contents shown below to set the forced charging mode. For other steps, please refer to 3.1.

Forced Discharge

• This mode must take effect after being connected to the power grid. In the forced discharge mode, the inverter selects the appropriate power to feed into the power grid according to the allowable discharge current, SOC and energy management calculation value of BMS. After receiving the BMS stop discharge command or changing the working mode, exit the forced discharge mode.
• In mode selection, please select the content shown in the figure below to set the strong playback mode. For other steps, please refer to 3.1.

Peak Shaving

• This mode must take effect after being connected to the grid. In peak shaving mode, the inverter can set up up to 10 groups of discontinuous charge and discharge time periods within 24 hours; In this mode, the power of load power supply, charge or discharge will be preferentially adjusted according to the allowable value of BMS and current energy management.

Maintenance

• This mode must take effect after being connected to the grid. In the maintenance mode, the inverter will charge the battery until the SOC is charged to 100% or set to other modes, and automatically exit this mode. The charging power is adjusted according to the allowable value of BMS and the current energy management.

Emergency Charging

• This mode must take effect after connecting to the power grid. In the emergency charging mode, the inverter will charge the battery according to the start or stop charging command of BMS until the SOC is charged to the upper limit value or set to other modes, and then automatically exit this mode. The charging power is adjusted according to BMS value and current energy management.

Off Grid

• When the inverter has only batteries or photovoltaic cells, the inverter will be Off Grid mode after normal operation. When the Grid is connected, the inverter will automatically switch to grid connection, and automatically enter the “Self Use” or “Peak shaving” mode according to the user’s settings.
• When the Grid is disconnected, the inverter will automatically switch to Off Grid state.

Attention:

• The utility grid must be an off-grid application of the TN system;
• This mode is not suitable for the supply of life-sustaining medical equipment, which may cause personal injury in case of power failure;
• When the inverter is only connected to photovoltaic and power grid, the inverter can also be connected to the grid.

Working Stetes

Waiting

• When the inverter is only connected to the power grid or photovoltaic, the inverter enters the standby state. At this time, the LCD displays “waiting”, and the inverter will always detect the current working state. When the conditions are met, the inverter will automatically return to normal.

Checking

• After the inverter is powered on or restarted from a recoverable fault, the check self-test will be carried out. At this time, the LCD displays “checking 60s”. If there is a fault or warning in the self-test, the inverter will prompt.

Normal

• After the inverter self inspection is successful, the inverter will enter the normal working state. At this time, the LCD operation light is always on, and the user can view relevant information through the LCD.

Fault

• When the inverter fails, the inverter will automatically stop output and enter the fault mode, and the fault information will be displayed on the LCD. Before entering the fault mode, the inverter will automatically save relevant information. If the fault is a recoverable fault, the inverter will automatically resume operation. In case of unrecoverable fault, the inverter will stop in the fault mode until relevant technicians handle the fault.

Warning!

• In case of inverter failure, it must be repaired by professionals
• The error codes displayed on the LCD can be viewed in the appendix

Upgrade

• Regardless of the working mode of the inverter, when the system meets the conditions for updating software, the inverter will enter the upgrade state and rewrite the firmware. Users can download the latest upgrade operation guide from the official website of KOYOE Energy.

Function Description

Safety Function

• The protective functions are integrated in the inverter, including SPD protection, short circuit protection, grounding insulation resistance surveillance, residual current protection, anti-islanding protection, DC overvoltage / over-current protection, etc.

Warning!

• There is an integrated leakage current detection unit inside the inverter. When the inverter detects the leakage current greater than the allowable value, it will be disconnected from the grid quickly
• If RCD(Leakage Current Protector) or Leakage Current Switch is installed externally, the operating current must be ≥300mA.

Energy Conversion and Management

• The inverter converts the DC power from the PV strings or the battery to the AC power, which conforms to the grid requirements. It also transmits the DC power from the PV panel to the battery.
• The inverter is integrated with a bidirectional converter, which can charge or discharge the battery.
• Two string MPP trackers can be utilized to maximize the power from PV strings with different orientations, tilts, or module structures.

Power Derating

• Power derating is a way to protect the inverter from overload or potential faults. In addition, the derating function can also be activated by the requirements of the utility grid. Situations requiring inverter power derating are:
• grid dispatching;
• over-temperature (including ambient temperature and module temperature);
• grid under-voltage;
• export power limit setting;
• power factor.

Grid Dispatching Derating

• Adjust the output power according to the remote scheduling instructions and the inverter operates with the power derating.

Over-temperature Derating

• A high ambient temperature or poor ventilation will lead to a power derating of the inverter.
• When the internal temperature or module temperature exceeds the upper limit, the inverter will reduce the power output until the temperature drops within the permissible range.

Grid Under-voltage Derating

• When the grid voltage is too low, the inverter will reduce the output power to make sure that the output current is within the permissible range. The following figure shows the under-voltage derating curve.

Power Factor Derating

• When the power factor PF<1.0, the inverter will reduce the output power within a specified range. The following figure shows the power factor derating curve.

External Demand Response

• The inverter provides a terminal block for connecting to a demand response enabling device (DRED). The DRED is demand response modes (DRMs). The Dred Demand Response Model (DRMS) is applicable in Australia. The inverter detects and initiates a response to all supported demand response commands within 2s.
• The following table lists the DRMs supported by the inverter.

to the constraints from other active DRMs.
---|---
DRM5| The export power to the grid is 0.
DRM6| The export power to the grid is no more than 50 % of the rated power.
DRM7| The export power to the grid is no more than 75 % of the rated power.
DRM8| The export power to the grid is 100 % of the rated power, but subject to the constraints from other active DRMs.

The DRED may assert more than one DRM at a time. The following shows the priority order in response to multiple DRMs.

Multiple Modes Priority Order

• DRM1…DRM4 DRM1 > DRM2 > DRM3 > DRM4
• DRM5…DRM8 DRM5 > DRM6 > DRM7 > DRM8

Unpacking and Storing

Unpacking and Inspecting

• The inverter is thoroughly tested and strictly inspected before delivery. Damage may still occur during shipping. Therefore, the first thing you should do after receiving the device is to conduct a thorough inspection.

1. Check the packaging for any visible damage.
2. Check the delivery contents for completeness according to the packaging list.
3. Check the inner contents for any visible damage.

• Contact KOYOE or the supplier in case there is any damage or incompleteness.
• Do not dispose of the original packing case. It is recommended to store the inverter in it.

Packing List

• On receiving the inverter, please check to make sure all the components as below are not missing or broken.

Inverter Storage

• Proper storage is required if the inverter is not installed immediately.
• Store the inverter in the original packing case with the desiccant inside.
• The storage temperature should be always between -30°C and +85°C, and the storage relative humidity should be always between 0 and 100 %.
• In case of stacking storage, the number of stacking layers should never exceed the limit marked on the outer side of the packing case (6 layers).
• The packaging must be upright.
• If the inverter has been stored more than a year, the qualified personnel should thoroughly check and test it before using.

Mechanical Mounting

Safety during Mounting

Warning!

• Make sure there is no electrical connection before installation.
• In order to avoid electric shock or other injury, be sure there is no electricity or plumbing installations before drilling holes.

Warning!

• The following improper practices may cause personal injury.
• When moving and positioning the inverter, it must be operated according to the instructions.
• System performance may deteriorate due to poor ventilation.
• To ensure safety, do not open the top cover.

Warning!

• Wear gloves to avoid scratches when mounting the inverter.
• The inverter must be installed by professionals.

Mounting Location

• Choose an optimal installation location to facilitate safe operation and maximize the performance and long life of the inverter.
• IP65 inverters can be installed indoors and outdoors.
• Install the inverter in a place that facilitates electrical connection, operation and maintenance.

Installation Environment Requirement

• The installation environment of the inverter must meet the following requirements:
• The installation environment must be away from flammable and explosive dangerous goods.
• Inverters must be installed in an environment out of reach of children.
• Ambient temperature (-25℃~ + 60℃) and relative humidity (0% ~ 100% without condensation).
• Direct exposure of the inverter to sunlight, rain and snow is prohibited.
• The inverter should be well ventilated to ensure air flow to the radiator.
• Do not install inverters in living areas, otherwise the inverter will produce noise during operation, affecting daily life.

Installation Carrier Requirement

• The installation carrier should meet the following requirements:

Installation Angle Requirement

• Never install the inverter horizontally, or with a forward tilt or with a backward tilt or even with upside down. The horizontal installation can result in damage to the inverter.

Installation Clearance Requirements

• Reserve enough clearance around the inverter to ensure sufficient space for heat dissipation.
• Clearance requirement and multiple installation

Mounting the Inverter

• Remember that this inverter is heavy! Please be careful when lifting out from the package. The inverter is suitable for mounting on concrete or other non-combustible surface only.
• Step1：Mark the screw hole position;
• Step2：use φ 8 drill bit，drilling depth 55mm,installexpansion threaded pipe;
• Step3：Correctly install the wall mounting bracket on the wall;
• Step4：Hang the inverter correctly on the wall hanging bracket and install the fixing screws.

ELECTRICAL WIRING CONNECTION

Safety Instruction

• Before any electrical connection, remember that this inverter is multi-power supplied. Electrical connections must be made by a professional and personal protective equipment must be worn.

Warning!

• Inverter has lethal high voltage inside, please pay attention to safety when operating.
• PV panels can produce lethal high voltage in sunlight. Do not touch PV output cables or interfaces.
• Confirmed that the DC and AC circuit breakers have been disconnected and that they are not inadvertently reconnected before starting electrical connections.
• Before connecting cables, make sure all cables are free of voltage or current.

Warning!

• Any improper operations during cable connection can cause device damage or personal injury.
• Only qualified personnel can perform cable connection.
• All cables must be undamaged, firmly attached, properly insulated and adequately dimensioned.

Warning!

• Comply with the safety instructions related to the PV strings and the regulations related to the utility grid.
• All electrical connections must be in accordance with local andnational standards.
• Only with the permission of the utility grid, the inverter can be connected to the utility grid.

Terminal Description

• All electrical terminals are located at bottom of the inverter. The diagram below shows the external interface of the inverter.

inverter
8| GRID Terminal| AC terminal for connection to the utility grid
9| LCD Label| LCD and Keys for inverter
10| PE Terminal| Connect to PE for addition grounding

• The image shown here is for reference only. The actual product received may differ.
• The COM terminals of the inverter are used to achieve a specific function, and the schematic diagram of their interface is shown below.

Electrical Connection Overview

• The inverter integrates the functions of energy storage and photovoltaic grid-connection. The system application figure is shown below.
• If the user requires that the load of EPS cannot be powered off, a dual power switch needs to be added, please connect it as shown in the figure below.

Note:

1. The photovoltaic input must be externally connected with SPD and DC switch;
2. When lead-acid battery is used, it is recommended to install battery temperature detector;
3. The EPS output must be connected with AC switch, and the off grid output line shall not be directly connected to Grid;
4. The grid connection must be connected with circuit breaker, SPD and voltage loss trip circuit breaker;
5. The maximum diameter of CT is 15mm, and it must be installed at the front end of ordinary load and inverter. The arrow direction of CT points to the power grid;

The electrical connection should be realized as follows:

No.| Cable| Type| Outer diameter

（mm）

| Cross section

（mm2）

---|---|---|---|---
1| Battery Cable| Complying with 1000V and 40A standard| 6~8mm| 6mm2
2| DC cable| Outdoor multi-core copper wire cable Complying with 1,000V

and 30A standard

| 4~6mm| 4mm2
3| AC cable*| Outdoor multi-core copper wire cable| 12~14mm| 4~6mm2
4|

Communication cable

| Shielded twisted pair|

5.3~7mm

| 2(0.5~1.0)mm2
CAT 5E outdoor shielded network cable| 80.2mm2
5| Additional Grounding cable| Outdoor single-core copper wire cable| The same as that of the PE wire in the AC cable

• If local regulations have other requirements for cables, set the cable specification according to the local regulations.

Backup Wiring Diagram

• Neutral line of alternative supply must not be isolated or switched. (applies to wiring rules AS/NZS_3000:2012 for Australia and New Zealand)
• Neutral line of alternative supply must be disconnected after the grid is off (applies to other counties).

Additional Grounding Connection

Warning!

• Since the inverter is transformerless , neither the negative pole nor the positive pole of the PV string must not be grounded. Otherwise, the inverter will not operate normally.
• Connect the additional grounding terminal to the protective grounding point before AC cable connection, PV cable connection, and communication cable connection.
• The ground connection of this additional grounding terminal cannot replace the connection of the PE terminal of the AC cable. Make sure the two terminals are both grounded reliably.

Additional Grounding Connection

• All non-current carrying metal parts and device enclosures in the PV power system should be grounded, for example, brackets of PV modules and inverter enclosure.
• When there is only one inverter in the system, connect the additional grounding cable to a nearby grounding point.

Connection Procedure

• There is an additional grounding terminals located at the right side of the inverter. Additional grounding cable is prepared by customers.
• Step 1 Prepare the cable and OT/DT terminal.
• Step 2 Remove the screw on the grounding terminal and fasten the cable with a screwdriver.
• Step 3 Apply paint to the grounding terminal to ensure corrosion resistance.

PV CONNECTION

• Warning! The PV array will generate lethal high voltage once exposed to sunlight.

Warning!

• Make sure the PV array is well insulated to ground before connecting it to the inverter.

Warning!

• Before connecting the PV array to the inverter, ensure that the impedances between the positive terminals of the PV string and earth, and between the negative terminals of the PV string and earth are larger than 1 M Ohm.

Warning!

• Risk of inverter damage! Observe the following requirements. Failure to do so will void guarantee and warranty claims.
• Make sure the maximum voltage of each string is always less than 1,000 V.
• Make sure the maximum short circuit current on the DC side is within the permissible range.

PV Input Configuration

• In Australia and New Zealand, ensure the DC power for any PV string never exceeds a certain level with regards to the string voltage to avoid derating:
• 12.5 kW if string voltage is lower than 500 V
• 10 kW if string voltage is between 500 V and 800 V
• 8 kW if string voltage is between 800 V and 1000 V
• For this serial inverters, each PV input operates independently and has its own MPPT. In this way, string structures of each PV input may differ from each other, including PV module type, number of PV modules in each string, angle of tilt, and installation orientation.

Assembling the PV Connector

Warning!

• High voltage may be present in the inverter!
• Ensure all cables are voltage-free before performing electrical operations.
• Do not connect the AC circuit breaker before finishing electrical connection.

Warning!

• Use the MC4 DC terminal within the scope of delivery. Damage to the device due to the use of incompatible terminal shall not be covered by the warranty.
• Before connecting PV panels/strings to inverter, please make sure to meet the requirements as below: PV strings could not connect to earth/grounding conductor;
• Use the DC plugs in the accessory box.
• NOTE: There will be MC4 DC plugs in accessory box, the detailed connection as below:
• Step1: Prepare PV cables and DC plugs.

Be careful!

• Please use DC plugs and connectors in KOYOE accessory box
• PV cable should be standard, 2.5-4mm2 PV cable
• Step2: Connect PV cable to DC connectors

Be careful!

• If the connector is damaged accidentally, please contact the after-sales service to apply for a special matching connector.
• Step3: Lead the cable through cable gland. Insert the crimp contact into the insulator until it snaps into place. Gently pull the cable backward to ensure firm connection. Tighten the cable gland and the insulator (torque 2.5 N· m to 3 N· m).
• Step4: Check for polarity correctness.

Be careful!

• The inverter will not function properly if any PV polarity is reversed.

Installing the PV Connector

• Step 1: Rotate the DC switch to “OFF” position.
• Step 2: Check the cable connection of the PV string for polarity correctness and ensure that the open circuit voltage in any case does not exceed the inverter input limit of 1,000V.
• Step 3: Connect the PV connectors to corresponding terminals until there is an audible click.

1. Check the positive and negative polarity of the PV strings, and connect the PV connectors to corresponding terminals only after ensuring polarity correctness.
2. Arc or contactor over-temperature may occur if the PV connectors are not firmly in place, and KOYOE shall not be held liable for any damage caused due to this operation.
3. Step 4: Follow the foregoing steps to connect PV connectors of other PV strings.
4. Step 5: Seal any unused PV terminal with a terminal cap.

Be careful!

If other power sources other than photovoltaic panels are connected to the PV port, do not turn on the power source before turning on the DC switch, otherwise safety accidents and equipment damage will occur, and KOYOE will not bear any responsibility.

Battery CONNECTION

Be careful!

• Only use properly insulated tools to prevent accidental electric shock or short circuits. If insulated tools are not available, use electrical tape to cover the entire exposed metal surfaces of the available tools except their tips.

Be careful!

• The plug connector must be connected only by trained electricians.

Be careful!

• The plug connector must be connected only by trained electricians.

Be careful!

• A two-pole DC circuit breaker with over-current protection (voltage rating not less than 600 V and current rating not less than 40 A) should be installed between the inverter and the battery.

Connecting the Power Cable

• All power cables are equipped with water-proof direct plug-in connectors, which match the battery terminals at the box of the inverter.
• The battery side terminal can be installed according to the 7.4.2. If you have any questions, please consult the customer service personnel.

Be careful!

• Before connecting the connector to the inverter, make sure the positive and negative poles are correct.Make sure the positive and negative voltages are less than 800V.

Connecting the communication Cable

• The inverter supports lead-acid batteries and lithium batteries. When connecting lead-acid batteries, please pay attention to the use environment of lead-acid batteries. When connecting the lithium battery, connect the communication line between the lithium battery and the inverter.

Connecting the NTC Cable

• When using lead-acid batteries, the user must connect to an external dedicated NTC. The wiring schematic is shown below：

Be careful!

• Please indicate whether NTC is required when purchasing inverters

AC Cable Connection

Grid Side Requirements

An independent three or four-pole circuit breaker must be installed on the output side of the inverter to ensure safe disconnection from the grid.

Be careful!

• Multiple inverters cannot share one circuit breaker.
• Never connect a load between the inverter and the circuit breaker.

Residual Current Monitoring Device

• With an integrated universal current-sensitive residual current monitoring unit included, the inverter will disconnect immediately from the mains power once a fault current with a value exceeding the limit is detected.
  However, if an external residual current device (RCD) is mandatory, the switch must be triggered at a residual current of 300 mA (recommended), or it can be set to other values according to local regulations. For example in Australia, the inverter can use an additional 30mA（Type A）RCD in installations.

Assembling the AC Connector

• The GRID terminal is on the lower right of the wiring panel of the inverter. AC connection is the three-phase-four-wire grid +PE connection (L1, L2, L3, N, and PE).
• Step 1: Close the fuse of the manual AC circuit breaker to prevent the circuit breaker from being opened unintentionally;
• Step 2: Put the cable through the nut, sealing ring and threaded sleeve in sequence, insert the cable into the terminal according to the polarity shown on it, and tighten the screw. As shown in Figure 7-1;
• Step 3: Strip the cable as shown in the figure below:

Be careful!

• The power loss on the cable should be controlled within 1% of the rated power.
• Step 4: Push the threaded sleeve onto the connection terminal until both are locked. As shown in Figure：
• Step 5: Insert the socket into the AC output terminal, screw the socket clockwise, and loosen the socket anticlockwise.

Be careful!

• Please make sure that the wiring sequence of each cable is correct!

EPS Cable Connection

• The terminal connection of EPS is the same as GRID terminal, but it’s color is red. Please refer to connection method in 7.5.

Communication Connection

• The inverter provides RS-485, WIFI, GPRS and other communication interfaces, and is equipped with a monitoring system, which can remotely browse the output voltage, current, grid frequency, fault and other information. At the same time, these parameters are stored in the local PC to facilitate the query of historical records.

Assembling Connection

• The RS485 and WIFI/4G share the same terminal, please avoid conflict when using. WiFi or 4G modules are optional when purchasing inverters The terminal definition is shown in the figure below：

There are three ways to connect the inverter

1. By using WiFi module to communicate with the inverter, users can view information about the inverter on mobile devices or websites.
2. By using the 4G module to communicate with the inverter, users can view information about the inverter on their mobile devices or websites.
3. By using the computer to communicate with the inverter, users can purchase a special transfer module to connect with the computer. After downloading the upper computer from the official website, they can view the information of the inverter

Meter Connection

• When the inverter is connected to the grid, it must be connected to the supporting electricity meter. Refer to section 1.1.2 for L/N connections.
• The inverter is connected with the electricity meter through RS485 communication mode. The wiring of the electricity meter is shown in the figure below

Commissioning

Inspection before Commissioning

Check the following items before starting the system:

1. The inverter DC switch and external circuit breaker are disconnected.
2. The inverter should be accessible for operation, maintenance and service.
3. Nothing is left on the top of the inverter or battery.
4. The inverter is correctly connected to the external devices, and the cables are routed in a safe place or protected against mechanical damage.
5. The selection of the AC circuit breaker is in accordance to this manual and all applicable local standards.
6. All unused terminals at the bottom of the inverter are properly sealed.
7. Warning signs and labels are suitably affixed and durable.
8. For EPS application, check the cable connections of inverter. Risk of inverter damage if the grid power wires are wrongly connected to the EPS terminals.

Powering on the System

If all the items mentioned in section 7.1 are OK, proceed as follows to start the inverter for the first time.

1. Rotate the DC switch of the inverter to “ON” position.
2. Turn on the AC switch between the inverter and the power grid.
3. Open the switch between the inverter and the battery. If it is matched with the company, open the switch of the battery main control box.
4. When the LCD screen lights up, the inverter will automatically start detection, and the top of the LCD screen will display the current state. If Normal is displayed, it means that the inverter works normally.

LCD Introduction

• When the LCD is displayed normally, the user can operate the keys to set the parameters and view them. The detailed menu flow chart is shown in Fig. 8-1.
• The important parameters of the inverter must be set by professionals, otherwise it may cause the inverter can not operate normally. Please contact customer service for the password of setting parameters.

Decommissioning

Decommissioning the Inverter

• For maintenance or other service work, the inverter must be switched off.
• Proceed as follows to disconnect the inverter from the AC and DC power sources. Lethal voltages or damage to the inverter will follow if otherwise.

Disconnecting the Inverter

1. Disconnect the AC circuit breaker and secure against reconnection.
2. Rotate DC switch to “OFF” position and the disconnect all of the PV string inputs.
3. Disconnect the EPS circuit.
4. Disconnect the circuit between the battery and the inverter (turn off the BMS or DC switch in main circuit).
5. Wait at least 10 minutes until the capacitors inside the inverter completely discharged.
6. Remove the DC connector (PV and Battery).
7. Remove the AC connector and EPS connector.
8. Install the MC4 waterproof plugs and AC waterproof cover.

Dismantling the Inverter

Be careful! Risk of burn injuries and electric shock!
Do not touch any inner live parts until at least 10 minutes after disconnecting the inverter from the utility grid and the PV input.

1. Refer to “7 Electrical Connection” for the inverter disconnection of all cables in reverse steps.
2. Dismantle the inverter referring to “6.2 Installing the Inverter” in reverse steps.
3. If necessary, remove the wall-mounting bracket from the wall.
4. If the inverter will be reinstalled in the future, please refer to “5.3 Inverter Storage” for a proper conservation.

Disposing the Inverter

Users should take the responsibility for the disposal of the inverter.

Be careful!

• Some parts and devices of the inverter, such as the LCD display, batteries, capacitors, may cause environment pollution.
• Do not dispose of the product together with household waste but in accordance with the disposal regulations for electronic waste applicable at the installation site.

Communication and Monitoring

Summery

• The inverter provides an RS485 communication interface, which can be connected to WIFI/GPRS module. After configuring the monitoring system, the output voltage, current, grid frequency, fault and other information can be browsed remotely.

Communication

• Users can browse the data of the inverter remotely through the RS485 communication interface. RS485 is usually used as local monitoring or connected to a third-party data collector: when connected to local monitoring, the RS485 interface of the inverter can be connected to the USB interface of the computer through the USB to RS485 converter. The longest RS485 line should not exceed 1200 meters. When networking and communication, a WIFI/GPRS communication module can be configured to realize the networking of communication.
  Be careful! Please refer to Section 7.7 for wiring RS485

Monitoring

• When the WIFI/GPRS communication module is inserted into the inverter and the network is successfully connected, the customer can monitor the information of the inverter through the monitoring website of KOYOE. The user opens the web browser and enters the website: http://solar.koyoe.com. After registering the account, the user can select the user name or serial number to log in. After logging in, the user can monitor the voltage, current power and other information of the inverter.
• In the Apple and Android APP stores, enter the KOYOE-log keyword and users can download the APP to your mobile device. After installation, enter your user name and password to access your power station to view the inverter information.

Maintenance and Repair

Precautions during Maintenance

• When the inverter fails, the inverter will automatically disconnect from the grid and send fault or warning information. For solutions to simple faults, please refer to the common in Appendix I.

Safety Requirements during Maintenance

• For the operation running and after operation, the shell temperature is high due to the heat generated by power circuit, which is at risk of scalding. Contact operation shall be carried out after cooling.
• For the operation running and after operation, the shell temperature is high due to the heat generated by power circuit, which is at risk of scalding. Contact operation shall be carried out after cooling.
• There is no repairable part in the inverter. If there is any problem, it must be maintained by professionals. Even if the inverter has been disconnected from PV and battery and power grid, it may still have dangerous voltage. Before starting work related to electronic system in the cabinet, the voltage of DC bus should be measured first. This voltage must be below 48V.

Daily Maintenance

• Usually, the inverter does not need regular maintenance and calibration. Due to natural heat dissipation, the radiator must not be covered by dust and other dirt.
• In order to ensure good ventilation of the inverter, it is necessary to check the radiator and make sure that it is unobstructed.
• If necessary, clean the inlet and outlet of the inverter with a soft brush. Do not use water, corrosive chemicals or strong detergents to clean the inverter.

Technical data

Technical Parameters And Certificates

32/32

Battery

| Max Input/Output Voltage(V)| 700| 700| 700| 700
Operating Voltage Range(V)| 180-700| 180-700| 180-700| 180-700
Max Charge/Discharge Current(A)| 50/50| 50/50| 50/50| 50/50
Max Input/Output Power(W)| 12k/12k| 15k/15k| 17k/17k| 20k/20k
Battery Type| Li-ion/Lead-acid
**** AC Input and Output| Rated Power(W)| 12000| 15000| 17000| 20000
Max. Apparent AC Power(VA)| 12000| 15000| 17000| 20000
Nominal AC Voltage(Vac)| 380,3L/N/PE| 380,3L/N/PE| 380,3L/N/PE| 380,3L/N/PE
AC Power Frequency(Hz)| 50/60| 50/60| 50/60| 50/60
Max. AC Output Current(A)| 18| 22| 25| 31
Power Factor Range| ~1 (Adjustable from 0.8 leading to 0.8 lagging
OutputTHDi(@Nominal Output)| <3%| <3%| <3%| <3%
 Off-Grid            AC Output

(Back-up            AC Output )

| Rated Output Power(W)| 12000| 15000| 17000| 20000
Max.    Apparent    AC        Output

Power(VA)

| 12000| 15000| 17000| 20000
Nominal AC Output Voltage(Vac)| 380,3L/N/PE| 380,3L/N/PE| 380,3L/N/PE| 380,3L/N/PE
AC Power Frequency(Hz)| 50/60| 50/60| 50/60| 50/60
Max. AC Output Current(A)| 18| 22| 25| 31
Genaral Data| Operating Temperature Range| -25℃ …+60℃(>45℃ derating)
Operating Altitude(m)| <4000
Noise(dB)| <40
Topology| Transformerless
Cooling Method| Natural convection
Ingress Protection Rating| IP65
Relative Humidity| 0-100%, no condensation
DC Connection Type| MC/Amphenol/Phoenix
AC Connection Type| Plug-in Connector
Display| LCD
Communication With Portal| RS485 (WiFi/GPRS Optinal))
Communication With BMS| CAN
Communication With Meter| RS485
Mounting Method| Wall-mounting bracket
Dimensions (WDH)(mm)| 505630220
Weight(Kg)| 34| 34| 36| 36
Certification| Safety| IEC62109-1/-2
EMC| EN61000-6-1/-2/-3,IEC61000
On-Grid standard| AS4777.2:2020 ， NRS097-2-1:2017 ， PN-EN50549-1:2019, VDE- AR-N 4105:2018, EN50549-1:2019+AC:2019-4

other safety and protection is shown below

Warranty commitment

• In order to provide you with high-quality service and better protect your rights and interests, please read this regulation carefully and keep your quality assurance card and purchase invoice.
• We will provide you with standard warranty service for 60 months. From the date of purchase, during the warranty period, we will provide you with free warranty and maintenance services.
• The faulty inverter needs to be returned to the factory for repair, so please keep the original package properly. If the customer uses the new packing box, the packing cost and transportation cost will be borne by the customer. During the warranty period, the customer needs to provide the original invoice and quality card, and the label of the inverter body is clearly visible. If these requirements cannot be met, we will not be able to provide you with perfect service.
• This regulation is applicable to series photovoltaic grid connected inverter produced by KOYOE. All products purchased through regular channels shall enjoy the full range of quality assurance services provided by the company, except for the following situations:

1. Beyond the warranty period;
2. No valid quality assurance card and product serial number;
3. Transportation damage;
4. Improper use, operation and modification;
5. Operating in an environment beyond the specified in this manual;
6. Any installation and use beyond the scope specified in relevant international standards;
7. Damage caused by abnormal natural disasters (earthquake, fire, flood, etc.).

Contact Information

If you have any questions about the PV grid connected inverter or technical issues, please

contact us:

• Jiangsu KOYOE Energy Technology Co., Ltd
• Address: NO. 40, Wangwu Road, Wuzhong District, Suzhou Province, China
• Tel: +86 512 6513 9208
• Email: sales_Int@koyoe.com
• Web: www.koyoe.com

Appendix I: Common Problems

In case the inverter will not work normally at times, solutions to common problems are listed below. This will help technicians understand problems and take effective measures.

1

| GFCI Fault| 1.  The grounding current is too high.

2.  After disconnecting the AC side circuit, pull out the photovoltaic cell at the input end and detect the peripheral equipment of the AC system.

3.  After removing the fault, reconnect the PV panel and AC side circuit to detect the inverter status.

2

| BMS

Communication Fault

| 1.  Communication between the battery pack and the inverter failed.

2.  Check whether the communication cable is connected correctly and reliably.

3.  Restart the inverter after replacing the connecting cable.

3

| SPI

Communication Fault

| 1.  Master-slave DSP communication failure, please restart the inverter.

2.  If it cannot work properly after reboot, please contact customer service

4

| PV Overvoltage Fault| 1. PV overvoltage fault, please check the PV input voltage, voltage value must be less than 1000V.

5

| Isolation Fault| 1.  Check whether the inverter is effectively earthed and whether the impedance between the positive and negative poles of the photovoltaic cell is greater than 1M Ω;

2.  Check whether the AC side is connected to the earth.

6

| Grid Voltage Fault| 1.  Please check whether the network voltage is too low or too high.

2.  Restart the inverter after the power grid is normal

7

| Grid Frequency Fault| 1.  Please check whether the grid frequency is too low or too high.

2.  Restart the inverter after the power grid is normal

8

| Bus Voltage High| 1. Bus voltage is high, please check whether the PV input voltage is less than 1000V.2. If the fault cannot be

cleared after restarting the inverter, please contact customer service.

9

| Off Grid Over Voltage Fault| 1.  High off-grid output voltage.

2.  Please check whether the off-grid port is connected correctly and whether the off-grid load is working

normally.

10

| Battery Over Temperature Fault| 1. Battery temperature is too high.2. Please confirm whether the battery is placed in a high temperature area.3. Please restart the inverter after the battery cools

down.

11

| Inverter Module Over Temperature Fault| 1. High temperature of inverter module.2. Please confirm whether the heat sink of the inverter is blocked.3. Please confirm whether the working environment temperature of the inverter is normal.4. Restore the inverter after the surface temperature of the

inverter cools.

---|---|---

12

| Battery Voltage Low Fault| 1. Low voltage battery failure. Please check the connection of the battery is correct.3. Please check whether the battery can work properly and restart the

inverter.

13

| Low ambient Temperature Warn| 1. Low ambient temperature fault.2. Please confirm whether the ambient temperature of the inverter and battery is lower than the normal value, and restart the

inverter after the ambient temperature rises.

In addition to the above common problems, if you encounter other unsolvable problems, please contact us, we will try our best to provide you with quality service.

Appendix II: Abbreviations of Terms

References

• solar.koyoe.com
• 江苏科曜能源科技有限公司__储能逆变器

Read User Manual Online (PDF format)

Read User Manual Online (PDF format)  >>

Download This Manual (PDF format)

Download this manual  >>