Koyoe KY-EST06KH User manual

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User Manual
3-Phase Hybrid Inverter
KY-EST06KH~KY-EST20KH
V1.0

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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.

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About This Manual
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-EST06KH
- KY-EST08KH
- KY-EST10KH
- 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.

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1. System Introduction............................................................................................................................ 7
1.1. Product Introduction ...........................................................................................................8
1.1.1 Inverter Introduction ..........................................................................................................8
1.1.2 Energy Mete......................................................................................................................8
1.1.2.1 Operating manual of Meter.............................................................................................8
2. Safety Instructions .............................................................................................................................18
2.1. PV Panels .........................................................................................................................18
2.2. Utility Grid..........................................................................................................................18
2.3. Battery...............................................................................................................................19
2.4. Inverter..............................................................................................................................19
2.5. Skills of Qualified Personnel..............................................................................................22
3. Energy Management ..............................................22
3.1. Self Use.............................................................................................................................22
3.2. Forced Charging................................................................................................................24
3.3. Forced Discharge..............................................................................................................24
3.4. Peak Shaving....................................................................................................................25
3.5. Maintenance......................................................................................................................25
3.6. Emergency Charging.........................................................................................................26
3.7. Off Grid .............................................................................................................................26
4. Working Stetes...................................................................................................................................27
4.1 Waiting...............................................................................................................................27
4.2 Checking............................................................................................................................27
4.3 Normal ...............................................................................................................................27
4.4 Fault...................................................................................................................................27
4.5 Upgrade.............................................................................................................................29
5. Function Description..........................................................................................................................29
5.1 Safety Function ..................................................................................................................29
5.2 Power quality response modes...........................................................................................35
5.3 Energy Conversion and Management ................................................................................35
5.4 Power Derating...................................................................................................................35
5.5 External Demand Response（DRMs）..............................................................................36
6. Unpacking and Storing......................................................................................................................37
6.1. Unpacking and Inspecting.................................................................................................37
6.2. Packing List.......................................................................................................................38
6.3. Inverter Storage.................................................................................................................39
7. Mechanical Mounting.........................................................................................................................40

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7.1. Safety during Mounting......................................................................................................40
7.2. Mounting Location.............................................................................................................40
8. ELECTRICAL WIRING CONNECTION...........................................................................................43
8.1. Safety Instruction...............................................................................................................43
8.2. Terminal Description..........................................................................................................44
8.3. Electrical Connection Overview.........................................................................................46
8.4. Additional Grounding Connection......................................................................................49
8.5. PV CONNECTION ............................................................................................................52
8.6. Battery CONNECTION......................................................................................................56
8.7. AC Cable Connection........................................................................................................60
8.8. EPS Cable Connection......................................................................................................62
8.9. Communication Connection...............................................................................................62
8.10. Meter Connection............................................................................................................62
8.11. Generation Limit and Export Limit Control.......................................................................62
8.11.1 Soft export Limit Control ............................................................................................62
8.11.2 Hard export Limit Control...........................................................................................62
8.11.3 Soft generation limit control........................................................................................62
8.11.4 Hard generation limit control......................................................................................62
9. Commissioning...................................................................................................................................64
9.1. Inspection before Commissioning......................................................................................69
9.2. Powering on the System....................................................................................................71
9.3. LCD Introduction ...............................................................................................................72
10. Decommissioning.............................................................................................................................74
10.1. Decommissioning the Inverter.........................................................................................74
10.1.1 Disconnecting the Inverter............................................................................................74
10.1. 2 Dismantling the Inverter................................................................................................74
10.1.3 Disposing the Inverter...................................................................................................74
11. Communication and Monitoring......................................................................................................75
11.1. Summery.........................................................................................................................75
11.2. Communication ...............................................................................................................75
11.3. RS-485 Communication .................................................................................................76
11.4. WiFi / GPRS Communication .........................................................................................76
11.5. Monitoring ......................................................................................................................76
12. Maintenance and Repair.................................................................................................................79
12.1. Precautions during Maintenance .....................................................................................79
12.2 .Safety Requirements during Maintenance.......................................................................79

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12.3. Daily Maintenance...........................................................................................................80
13. Technical data..................................................................................................................................80
13.1 .Technical Parameters And Certificates............................................................................80
14. Warranty commitment .....................................................................................................................83
15. Contact Information .........................................................................................................................84
Appendix I: Common Problems............................................................................................................85
Appendix II: Abbreviations of Terms.....................................................................................................86

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1. System Introduction
KY-EST06KH/ KY-EST08KH/ KY-EST10KH/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.
Fig.1-1 PV Energy Storage System
Item
Description
Remark
A
PV strings
Photovoltaic panel
B
Inverter
Model：KY-EST20KH
C
Energy meter(three-phase)
RS 485 communication with inverter
D
Utility grid
Grid grouding system types: TT,TN
E
Battery System
A Li-ion battery or a lead-acid battery.
F
UPS load
User load connected to the inverter EPS port.
G
Grid load
User loads connected to the grid.
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.

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1.1. Product Introduction
1.1.1 Inverter Introduction
Model Description
The inverter model description is as follows (Take KY-EST20KH as an example):
KY -EST 20K H
High voltage battery（180V~700V）
The inverter power is 20KW
The inverter is three phase hybrid inverter
Code of KOYOE
Model
Nominal Output Power
Nominal Grid Voltage
KY-EST06KH
6000W
3/N/PE,230/400V
KY-EST08KH
8000W
KY-EST10KH
10000W
KY-EST12KH
12000W
KY-EST15KH
15000W
KY-EST17KH
17000W
KY-EST20KH
20000W
Appearance
The following figure shows the inverter appearance, which is for reference only. The actual
product that you receive may differ.

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Fig1-2.Appearance(KY-EST06-10KH)
Fig1-3.Appearance(KY-EST12-20KH)
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.

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Dimensions KY-EST06-10KH(unit: mm)
Dimensions KY-EST12-20KH(unit: mm)