KEHUA TECH iStoragE3 Series User manual

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iStoragE3 Series
Energy Storage System
User Manual

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Copyright © Xiamen Kehua Digital Energy Tech Co., Ltd. 2022. All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means without prior
written consent of Xiamen Kehua Digital Energy Tech Co., Ltd.
Trademarks and Permissions
and other Kehua trademarks are the licensed trademarks of Xiamen Kehua Digital Energy
Tech 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.
XIAMEN KEHUA DIGITAL ENERGY TECH CO., LTD.
Address:
Room 208-38, Hengye Building, No. 100 Xiangxing Road, Torch High-tech
Zone (Xiang'an) Industrial Zone, Xiamen, China
Website:
www.kehua.com
E-mail:
[email protected]
Customer Service Telephone:
400-808-9986
Tel:
0592-5160516
Fax:
0592-5162166

Foreword
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User Manual
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Foreword
Summaries
Thank you for choosing the iStoragE3 series energy storage system (hereinafter referred to as
iStoragE3)!
This document gives a description of the iStoragE3 series energy storage system, 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
−iStoragE3 5K
−iStoragE3 6K
−iStoragE3 8K
−iStoragE3 10K
−iStoragE3 12K
Battery pack
−iStoragE B5-S2
The iStoragE3 series energy storage system consists of inverter and battery.
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.

iStoragE3 Series Energy Storage System
User Manual
Foreword
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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
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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 PVArray ..........................................................................................................................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
2 Overview.........................................................................................................................................8
2.1 Product Intro.....................................................................................................................................................8
2.1.1 Model Meaning.......................................................................................................................................9
2.1.2 Working Mode ......................................................................................................................................10
2.2 Appearance.....................................................................................................................................................12
2.2.1 Inverter..................................................................................................................................................12
2.2.2 Battery Pack..........................................................................................................................................13
2.3 Structure Layout.............................................................................................................................................14
2.3.1 Inverter..................................................................................................................................................14

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2.3.2 Battery Pack..........................................................................................................................................16
2.4 Size.................................................................................................................................................................16
2.5 Heat Dissipation Illustration...........................................................................................................................17
2.6 Application Scenarios.....................................................................................................................................18
3 Installation....................................................................................................................................20
3.1 Installation Process.........................................................................................................................................20
3.2 Installation Preparation ..................................................................................................................................21
3.2.1 Tools......................................................................................................................................................21
3.2.2 Installation Environment.......................................................................................................................22
3.2.3 Installation Space..................................................................................................................................23
3.3 Transportation and Unpacking .......................................................................................................................23
3.3.1 Transportation.......................................................................................................................................23
3.3.2 Unpacking and Checking......................................................................................................................24
3.4 Mechanical Installation..................................................................................................................................25
3.5 Electrical Connection.....................................................................................................................................37
3.5.1 Wire Specification.................................................................................................................................37
3.5.2 External Grounding Connection ...........................................................................................................37
3.5.3 DC Input (PV) Connection ...................................................................................................................39
3.5.4 Grid Connection....................................................................................................................................42
3.5.5 Load Connection...................................................................................................................................45
3.5.6 WIFI/4G Connection.............................................................................................................................47
3.5.7 Communication Connection .................................................................................................................48
3.6 Installation Side Cover Plates ........................................................................................................................50
3.7 Check the Installation.....................................................................................................................................51
4 APP Operation.............................................................................................................................52
4.1 First Startup....................................................................................................................................................52
4.2 Inverter Information Query............................................................................................................................54
4.2.1 Running Information.............................................................................................................................56
4.2.2 Status Information.................................................................................................................................63
4.3 Control Interface ............................................................................................................................................64

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4.3.1 Basic Parameter Setting........................................................................................................................64
4.3.2 System Setting ......................................................................................................................................69
4.3.3 Battery Setting ......................................................................................................................................70
4.3.4 Grid Setting...........................................................................................................................................70
5 Startup and Shutdown ...............................................................................................................71
5.1 Startup............................................................................................................................................................71
5.2 CEI Self-Check ..............................................................................................................................................72
5.3 Shutdown .......................................................................................................................................................75
6 Maintenance and Troubleshooting .........................................................................................76
6.1 Maintenance...................................................................................................................................................76
6.2 Troubleshooting..............................................................................................................................................77
7 Package, Transportation and Storage......................................................................................88
7.1 Package ..........................................................................................................................................................88
7.2 Transportation ................................................................................................................................................88
7.3 Storage ...........................................................................................................................................................88
A Technical Specifications ...........................................................................................................90
B Acronyms and Abbreviations ..................................................................................................95

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User Manual
1 Safety Description
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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
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.

1 Safety Description
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Don't touch terminals or conductors that connected with grid to avoid lethal risk!
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 80℃. During running, please don't touch the
surface to avoid scald.
No liquid or other objects are allowed to enter iStoragE3, or, it may cause iStoragE3 series energy
storage system damage.
In case fire, please use dry power fire extinguisher. If using liquid fire extinguisher, it may cause
electric shock.

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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.
Danger to life due to high voltages in the inverter, observe a waiting time of 5
minutes.
High voltages that can cause lethal electric shocks are present in the live
components of the inverter.
Prior to performing any work on the inverter, disconnect it from all voltage
sources as described in this document.
Beware of hot surface
The product can get hot during operation.
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!

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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 device 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.

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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.
When the port of battery pack and inverter are not in use, please don't remove the corresponding
waterproof cover.
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 meet the site requirements.

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The connections for measuring device should be correct and standard to avoid arcing.
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 any AC conductors or PV conductors which should be only connected to the
inverter directly to the battery pack.
Do not charge or discharge the 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.
Keep the battery away from the fire source..
1.2.2 Response to Emergency Situations
The battery pack consists of multiple batteries to form a high-voltage system, if it fails, there is a
high-voltage risk. Kehua company cannot guarantee the absolute safety of the battery pack, so you
need to pay attention to the following matters:
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.
If a fire breaks out in the place where the battery pack is installed, perform the following
countermeasures.
−Fire extinguishing media

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Respirator is not required during normal operations. Use FM-200 or CO2extinguisher for battery fire.
Use an ABC fire extinguisher, if the fire is not from battery and not spread to it yet.
−Fire fighting instructions
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 iStoragE3 series energy storage system 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 system.
Know well about the related standards of local country and district.

2 Overview
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User Manual
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2 Overview
This chapter mainly introduces the device features, appearance, operating mode, etc.
2.1 Product Intro
With iStoragE3 series energy storage system, it is possible to effectively manage energy in users’
home day and night. This energy storage system provides a complete energy solution with multiple
working modes which meet different application scenarios. It will bring independence and economy
for energy use.
iStoragE3 series inverter needs to be used with matched battery packs. Based on actual needs, 1
inverter can be used with 1~8 battery packs together, as shown in Figure2-2.
Figure2-1 Energy storage system
The more battery pack configured, the more energy stored, and the more time backed up.
When the matched battery packs more than 4, the battery packs needs to installed as 2 piles.

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Figure2-2 Configuration diagram
2.1.1 Model Meaning
Inverter
iStoragE 3 □□K
Product series mark
iStoragE series energy storage system
Output power mark
5K means the output power is 5kW
6K means the output power is 6kW
And so on.
Phase number mark
1 means single-phase
2 means two-phase
3 means three-phase
Applicative market mark
N/A means Europe standard market
A means America market
Figure2-3 Model meaning of inverter

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Battery pack
iStoragE B5 - S2
Product series mark
iStoragE series energy storage system
Battery capacity mark
B5 means that the battery capacity is 5kWh
Inner mark
Figure2-4 Model meaning of battery pack
2.1.2 Working Mode
Backup mode
iStoragE3 product can work as an energy backup unit in order to provide uninterrupted blackout
protection when the grid goes down.
Grid is available
BAT is full
BAT is not full
BAT is empty
PV>load
Rest PV power to grid.
PV charge the BAT.
PV<load
PV+grid power support
the load.
PV+grid power support the load and charge the
BAT.
PV is not available
Grid power support the
load.
Grid power support the load and charge the
BAT.
Grid is not available, transfer to off-grid mode
Self consumption mode
iStoragE3 series product provides energy to loads in priority, then excess PV energy to battery. When
PV power is insufficient or no PV power, battery discharge to load.
Grid is available

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BAT is full
BAT is not full
BAT is empty
PV>load
Rest PV power to grid.
PV charge the BAT.
PV<load or PV is
not available.
BAT discharge.
PV+grid or grid
power support the
load, BAT stand by.
Grid is not available, transfer to off-grid mode
Time of use mode
iStoragE3 product can meet the maximum energy utilization rate and users' income. According to
peak-valley electricity price and users' electricity demand.
Grid is available
BAT is full
BAT is not full
BAT is empty
PV>load
Rest PV power to grid.
PV charge the BAT
PV<load or PV is
not available.
BAT discharge.
PV+grid or grid power
support the load, BAT
stand by.
Grid is not available, transfer to off-grid mode
Energy scheduling mode
iStoragE3 series product provides charge and discharge time settings for customers，so they can
pre-charge when the price of power is low, and save the energy for use when grid power prices are
high.
Grid is available
BAT is full
BAT is not full
BAT is empty
PV>load
Rest PV power to grid.
PV charge the BAT.
PV<load or PV is
not available.
BAT discharge.
PV+grid or grid power
support the load, BAT
stand by.
Grid is not available, transfer to off-grid mode

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External control mode
iStoragE3 series product can realize the remote scheduling of inverter control, and energy
management optimization strategy through API interface.
External control mode and other modes above can be seleted simultaneously. The other mode will run
in out of schedule time.
Off-grid mode
iStoragE3 series product can be operated in a completely off-grid mode where no grid power is
available.
BAT is full
BAT is not full
BAT is empty
PV>load
PV power limited to
load.
PV charge the BAT.
PV<load or PV is
not available.
BAT discharge.
Equipment auto
power-off.
The above modes are only functional definitions, and the setting items may not have corresponding
items.
2.2 Appearance
2.2.1 Inverter
Figure2-5 Appearance of inverter