KEHUA TECH iStoragE Series User manual

PV Energy Storage Inverter
iStoragE Series
User Manual

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i
Copyright © Kehua Data Co., Ltd.2021.All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means without prior
written consent of Kehua Data Co., Ltd.
Trademarks and Permissions
and other Kehua trademarks are trademarks of Kehua Data Co., Ltd.
All other trademarks and trade names mentioned in this document are the property of their respective
holders.
Notice
The purchased products, services and features are stipulated by the contract made between Kehua and
the customer. All or part of the products, services and features described in this document may not be
within the purchase scope or the usage scope. Unless otherwise specification in the contract, all
statements, information, and recommendations in this document are provided “AS IS”without warranties,
guarantees or representations of any kind, either express or implied.
The information in this document is subject to change without notice. Every effort has been made in the
preparation of this document to ensure accuracy of the contents, but all statements, information, and
recommendations in this document do not constitute a warranty of any kind, express or implied.
KEHUADATA CO.,LTD.
Address:
No.457,MalongRoad,TorchHigh-TechIndustrialZone,Xiamen,Fujian,China
Website:
www.kehua.com
E-mail:
[email protected]
Customer Service Telephone:
400-808-9986
Tel:
0592-5160516
Fax:
0592-5162166

Foreword
PV Energy Storage Inverter iStoragE Series
User Manual
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All rights reserved ©Kehua Data Co., Ltd.
Foreword
Summaries
Thank you for choosing the PV energy storage inverter iStoragE series (hereinafter referred to as
iStoragE)!
This document gives a description of the PV energy storage inverter iStoragE series, including the
features, performance, appearance, structure, working principles, installation, operation and
maintenance.etc.
Please save the manual after reading, in order to consult in the future.
The figures in this manual are just for reference, for details please see the actual product.
Suitable Model
Inverter
−iStoragE 3600
−iStoragE 5000
−iStoragE 6000
Battery
−iStoragE B8
1. The PV energy storage inverter iStoragE series consists of inverter and battery.
2. Single battery is iStoragE B8, two batteries is iStoragE B16, and so on. The PV energy storage
inverter iStoragE series install up to 4 batteries. For special illustration, the following take iStoragE
B8 as an example.
Symbol Conventions
The manual quotes the safety symbols, these symbols used to prompt users to comply with safety
matters during installation, operation and maintenance. Safety symbol meaning as follows.

PV Energy Storage Inverter iStoragE Series
User Manual
Foreword
All rights reserved ©Kehua Data Co., Ltd.
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Symbol
Description
Alerts you to a high risk hazard that will, if not avoided, result in
serious injury or death.
Alerts you to a medium low risk hazard that could, if not avoided,
result in moderate or minor injury.
Alerts you to a low risk hazard that could, if not avoided, result in
minor injury.
Anti-static prompting.
Be care electric shock prompting.
Provides a tip that may help you solve a problem or save time.
Provides additional information to emphasize or supplement
important points in the main text.

Contents
PV Energy Storage Inverter iStoragE Series
User Manual
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All rights reserved ©Kehua Data Co., Ltd.
Contents
1 Safety Description.........................................................................................................................1
1.1 Safety Announcements.....................................................................................................................................1
1.1.1 Use Announcements................................................................................................................................1
1.1.2 Inverter Symbol Illustration....................................................................................................................3
1.1.3 Protection for PV Array ..........................................................................................................................3
1.1.4 ESD Protection........................................................................................................................................4
1.1.5 Grounding Requirements........................................................................................................................4
1.1.6 Moisture-proof Protection.......................................................................................................................4
1.1.7 Safety Warning Label Setting .................................................................................................................5
1.1.8 Electrical Connection..............................................................................................................................5
1.1.9 Measurement Under Operation...............................................................................................................5
1.2 Safety Precaution for Battery Pack ..................................................................................................................6
1.2.1 General Safety Precautions.....................................................................................................................6
1.2.2 Response to Emergency Situations .........................................................................................................6
1.3 Requirements for Operator...............................................................................................................................7
1.4 Environment Requirements..............................................................................................................................7
2 Overview.........................................................................................................................................9
2.1 Product Intro.....................................................................................................................................................9
2.1.1 Model Meaning.....................................................................................................................................10
2.1.2 Features.................................................................................................................................................10
2.1.3 Operating Mode .................................................................................................................................... 11
2.2 Appearance and Structure...............................................................................................................................12
2.2.1 LED Signals..........................................................................................................................................13
2.2.2 External Terminal Illustration ...............................................................................................................14

PV Energy Storage Inverter iStoragE Series
User Manual
Contents
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2.3 Application Scenes.........................................................................................................................................17
3 Installation....................................................................................................................................19
3.1 Installation Process.........................................................................................................................................19
3.2 Installation Preparation ..................................................................................................................................20
3.2.1 Tools......................................................................................................................................................20
3.2.2 Installation Environment.......................................................................................................................21
3.2.3 Installation Space..................................................................................................................................21
3.2.4 Installation Way ....................................................................................................................................22
3.3 Transportation and Unpacking .......................................................................................................................22
3.3.1 Transportation.......................................................................................................................................22
3.3.2 Unpacking and Checking......................................................................................................................23
3.4 Installation......................................................................................................................................................24
3.4.1 Single Battery Installation.....................................................................................................................24
3.4.2 More Batteries Installation....................................................................................................................28
3.4.3 Inverter Installation...............................................................................................................................31
3.5 Electrical Connection.....................................................................................................................................33
3.5.1 Wire Requirement.................................................................................................................................33
3.5.2 External Grounding Connection ...........................................................................................................35
3.5.3 DC Input (PV) Connection ...................................................................................................................36
3.5.4 Battery Connection ...............................................................................................................................39
3.5.5 AC Output (GRID) Connection ............................................................................................................40
3.5.6 WIFI Connection...................................................................................................................................43
3.5.7 Communication Port Connection (Optional) ........................................................................................44
3.6 Check the Installation.....................................................................................................................................48
4 APP Operation.............................................................................................................................49
4.1 First Startup....................................................................................................................................................49
4.2 Inverter Information Query............................................................................................................................51
4.2.1 Running Information.............................................................................................................................52
4.2.2 Status Information.................................................................................................................................55
4.3 Control Interface ............................................................................................................................................56

Contents
PV Energy Storage Inverter iStoragE Series
User Manual
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5 Startup and Shutdown ...............................................................................................................61
5.1 Startup............................................................................................................................................................61
5.2 Shutdown .......................................................................................................................................................61
6 Maintenance and Troubleshooting .........................................................................................62
6.1 Maintenance...................................................................................................................................................62
6.2 Troubleshooting..............................................................................................................................................62
7 Package, Transportation and Storage......................................................................................73
7.1 Package ..........................................................................................................................................................73
7.2 Transportation ................................................................................................................................................73
7.3 Storage ...........................................................................................................................................................73
A Technical Specifications ...........................................................................................................74
B Acronyms and Abbreviations ..................................................................................................79

PV Energy Storage Inverter iStoragE Series
User Manual
1 Safety Description
All rights reserved ©Kehua Data Co., Ltd.
1
1 Safety Description
This chapter mainly introduces the safety announcements. Prior to performing any work on the
device, please read the user manual carefully, follow the operation and installation instructions and
observe all danger, warning and safety information.
1.1 Safety Announcements
Before operation, please read the announcements and operation instructions in this section carefully
to avoid accident.
The promptings in the user manual, such as "Danger", "Warning", "Caution", etc. don't include all
safety announcements. They are just only the supplement of safety announcements when operation.
Any device damage caused by violating the general safety operation requirements or safety standards
of design, production, and usage will be out of Kehua's guarantee range.
1.1.1 Use Announcements
Don't touch terminals or conductors that connected with grid to avoid lethal risk!

1 Safety Description
PV Energy Storage Inverter iStoragE Series
User Manual
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All rights reserved ©Kehua Data Co., Ltd.
There is no operational part inside the inverter. Please do not open the crust of the inverter by
yourself, or it may cause electric shock. The inverter damage caused by illegal operation is out of the
guarantee range.
Damaged device or device fault may cause electric shock or fire!
Before operation, please check if the inverter is damaged or has other danger.
Check if the external device or circuit connection is safe.
Before checking or maintenance, if the DC side and AC side is power down just now, it is necessary
to wait for 5 minutes to ensure the inner device is completely discharged, and then the operation can
be performed.
The surface temperature of the inverter may reach to 60℃. During running, please don't touch the
surface to avoid scald.
No liquid or other objects are allowed to enter the inverter, or, it may cause inverter damage.

PV Energy Storage Inverter iStoragE Series
User Manual
1 Safety Description
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In case fire, please use dry power fire extinguisher. If using liquid fire extinguisher, it may cause
electric shock.
1.1.2 Inverter Symbol Illustration
Table1-1 Inverter symbol illustration
Symbol
Illustration
Beware of a danger zone
This symbol indicates that the product must be additionally grounded if additional
grounding or equipotential bonding is required at the installation site.
Beware of electrical voltage
The product operates at high voltages.
WEEE designation
Do not dispose of the product together with the household waste but in
accordance with the disposal regulations for electronic waste applicable at the
installation site.
Observe the documentation
CE marking
The product complies with the requirements of the applicable EU directives.
1.1.3 Protection for PV Array
When install PV array in daytime, it necessary to cover the PV array by light-proof material, or the
PV array will generate high voltage under sunshine. If touching PV array accidently, it may cause
electric shock or human injury!

1 Safety Description
PV Energy Storage Inverter iStoragE Series
User Manual
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All rights reserved ©Kehua Data Co., Ltd.
There exists dangerous voltage between the positive and negative of PV array!
When installing the device, make sure that the connection between inverter and PV array has been
disconnected completely. And set warning mark in the disconnected position to avoid reconnecting.
1.1.4 ESD Protection
To prevent human electrostatic damaging sensitive components(such as circuit board), make sure that
you wear a anti-static wrist strap before touching sensitive components, and the other end is well
grounded.
1.1.5 Grounding Requirements
High leakage risk! The inverter must be grounded before wiring. The grounding terminal must be
connected to ground, or, there will be the risk of electric shock when touching the inverter.
When installing, the inverter must be grounded first. When dismantling, the grounding wire must
be removed at last;
Don't damage the grounding conductor;
The inverter must be connected to protection grounding permanently.
Before operation, check the electrical connection to ensure the inverter is grounded reliably.
1.1.6 Moisture-proof Protection
Moisture incursion may cause the inverter damage!
Observe the following items to ensure the inverter works normally.

PV Energy Storage Inverter iStoragE Series
User Manual
1 Safety Description
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When the air humidity is more than 95%, don't open the door of the inverter;
In the wet or damp weather, don't open the door of the inverter to maintain or repair.
1.1.7 Safety Warning Label Setting
In order to avoid accident for unwanted person gets close to the inverter or makes improper operation,
observe the following requirements while installing, maintaining or repairing.
Set warning marks where the switches are to avoid switching them on improperly.
Set warning signs or safety warning belt in the operation area, which is to avoid human injury or
device damage.
1.1.8 Electrical Connection
Electrical connection must be performed according to the description in the user manual and the
electrical schematic diagram.
The configuration of PV string, grid level, grid frequency, etc. must meet the technical requirements
of inverter.
Grid-tied generation should be allowed by the local power supply department and the related
operation should be performed by professionals.
All electrical connection must meet the related country and district standard.
1.1.9 Measurement Under Operation
There exists high voltage in the device. If touching device accidently, it may cause electric shock. So,
when perform measurement under operation, it must take protection measure (such as wear insulated
gloves, etc.)
The measuring device must meet the following requirements:
The range and operation requirements of measuring device meets the site requirements;
The connections for measuring device should be correct and standard to avoid arcing.

1 Safety Description
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1.2 Safety Precaution for Battery Pack
1.2.1 General Safety Precautions
Overvoltage or wrong wiring can damage the battery pack and cause deflagration, which can be
extremely dangerous.
All types of breakdown of the battery may lead to a leakage of electrolyte or flammable gas.
Battery pack is not user serviceable. High voltage is present in the device.
Read the label with Warning Symbols and Precautions, which is on the right side of the battery
pack.
Do not connect anyAC conductors or PV conductors which should be only connected to the
inverter directly to the battery pack.
Do not charge or discharge damaged battery.
Do not damage the battery pack in such ways as dropping, deforming, impacting, cutting or
penetrating with a sharp object. It may cause a leakage of electrolyte or fire.
Do not expose battery to open flame.
1.2.2 Response to Emergency Situations
The battery pack comprises multiple batteries that are designed to prevent hazards resulting from
failures. However, Kehua cannot guarantee their absolute safety.
1. If a user happens to be exposed to internal materials of the battery cell due to damage on the
outer casing, the following actions are recommended.
Inhalation: Leave the contaminated area immediately and seek medical attention.
Eye contact: Rinse eyes with running water for 15 minutes and seek medical attention.
Contact with skin: Wash the contacted area with soap thoroughly and seek medical attention.
Ingestion: Induce vomiting and seek medical attention.
2. If a fire breaks out in the place where the battery pack is installed, perform the following
countermeasures.
Fire extinguishing media
Respirator is not required during normal operations. Use FM-200 or CO2 extinguisher for battery fire.
Use anABC fire extinguisher, if the fire is not from battery and not spread to it yet.
Fire fighting instructions

PV Energy Storage Inverter iStoragE Series
User Manual
1 Safety Description
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−If fire occurs when charging batteries, if it is safe to do so, disconnect the battery pack circuit
switch to shut off the power to charge.
−If the battery pack is not on fire yet, extinguish the fire before the battery pack catches fire.
−If the battery pack is on fire, do not try to extinguish but evacuate people immediately.
Effective ways to deal with accidents
−On land: Place damaged battery into a segregated place and call local fire department or
service engineer.
−In water: Stay out of the water and don't touch anything if any part of the battery, inverter, or
wiring is submerged. Do not use submerged battery again and contact the service engineer.
1.3 Requirements for Operator
The operation and wiring for inverter should be performed by qualified person, which is to ensure
that the electrical connection meets the related standards.
The professional technicist must meet the following requirements:
Be trained strictly and understand all safety announcements and master correct operations.
Fully familiar with the structure and working principle of the whole PV grid-tied generation
system.
Know well about the related standards of local country and district.
1.4 Environment Requirements
Avoid the inverter suffering directly sunshine, rain or snow to prolong the service life (detail please
see 3.2.2 ). If the installation environment does not meet the requirement, the guarantee time may be
influenced.

1 Safety Description
PV Energy Storage Inverter iStoragE Series
User Manual
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All rights reserved ©Kehua Data Co., Ltd.
The used environment may influence the service life and reliability of the inverter. So, please avoid
using the inverter in the following environment for a long time.
The place where beyond the specification (operating temperature:-30℃～60℃, relative humidity:
0%-95%).
The place where has vibration or easy impacted.
The place where has dust, corrosive material, salty or flammable gas.
The place where without good ventilation or closed.

PV Energy Storage Inverter iStoragE Series
User Manual
2 Overview
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2 Overview
This chapter mainly introduces the device features, appearance, operating mode, etc.
2.1 Product Intro
If the PV energy is sufficient, in addition to powering the load, the excess is stored in the battery pack
for supply energy when the energy supply at night is insufficient. Battery charge and discharge are
use DC/DC circuit. Charge and discharge are share a main circuit for two-way flow of energy.
DC/AC circuit work as inverter when grid-tied and off-grid or work as rectifier when mains reverse
charge the battery. Inverter and rectifier are share a DC/AC circuit for two-way flow of energy. It is
suitable for home and commercial roof PV generation system and distributed PV generation system.
Generally, the system consists of PV array, battery pack and inverter, etc. ,as shown in Figure2-1.
Figure2-1 PV+ESS system
M e te r
A p p lic a ti o n
O n l in e
M o n it o rin g
G rid

2 Overview
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User Manual
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2.1.1 Model Meaning
Inverter
iStoragE □□ □□□□
iStoragE series PV storage inverter
Output power
N/A means single phase
3 means three-phase
N/A means 230Vac
A means 110Vac
Figure2-2 Model meaning of the inverter
Battery
iStoragE B8
iStoragE series PV storage inverter
B8 means battery capacity is 8.2Kwh
B16means battery capacity is16.4Kwh
And so on
Figure2-3 Model meaning of the battery
2.1.2 Features
Investable
Better PV utilization
Faster charging ability
Higher battery efficiency
Intelligent
User-friendly interface
Intelligent monitoring
Smart power grids adaptability
Integrated

PV Energy Storage Inverter iStoragE Series
User Manual
2 Overview
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Easy installation
Easy O&M
Easy capacity expansion
2.1.3 Operating Mode
Backup mode
When the energy generated by PV array is sufficient, PV array will charge battery in advance, the
remaining energy will supply power for load. If there still has remaining energy, it will be supplied
for grid-connection generation. When the energy generated by PV array is not enough for load, the
load will get energy from grid.
When battery SOC is less than 50%, charging the battery with maximum power , PV array will
charge battery in advance. If the PV energy is not enough for battery, the grid will supply power for
the battery.
When battery SOC is more than 55% (50%+5%), the battery charging power is determined by PV
power supply power
Self-production mode
When the energy generated by PV array is sufficient, PV array will supply power for load in advance,
the remaining energy will charge battery. If there still has remaining energy, it will be supplied for
grid-connection generation.
Energy shift scheduling mode
User can set the charging time and discharging time of battery. to set the battery charging with full
capacity or discharging with full capacity.
External control mode
External control mode have battery priority and grid priority. In the external control period, the
operating status is determined by charge power and discharge power of battery when the product is in
battery priority mode and the operating status is determined by control power of grid when the
product is in grid priority mode. Outside the external control period, the product will switch to the
original setting mode.

2 Overview
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User Manual
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Peak shaving mode
Peak shaving mode is realized through setting the peak period and valley period. In the peak period,
set to self-production mode; in the valley period, set to backup mode; in the other period, the battery
power is 0 and the PV array will supply power for grid if it still have energy.
2.2 Appearance and Structure
The appearance of the inverter and battery are as shown in Figure2-4 and Figure2-5.
Figure2-4 Appearance of the inverter
Figure2-5 Appearance of the battery