KEHUA TECH SPI-B2S Series User manual

PV Grid-Connected
Inverter SPI-B2S Series
(1500-6000)
User Manual

Foreword
PV Grid-Connected Inverter SPI-B2S Series
(1500-6000) User Manual
ii
All rights reserved ©Xiamen Kehua Digital Energy Tech Co.,Ltd
Copyright © Xiamen Kehua Digital Energy Tech Co., Ltd2021. 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 (Xiangan) Industrial Zone, Xiamen, People’s Republic of China
Website:
www.kehua.com
E-mail:
[e-mail]
Customer Service Telephone:
400-808-9986
Tel:
0592-5160516
Fax:
0592-5162166

PV Grid-Connected Inverter SPI-B2S Series
(1500-6000) User Manual
Foreword
All rights reserved ©Xiamen Kehua Digital Energy Tech Co.,Ltd
iii
Foreword
Summaries
Thank you for choosing Kehua’s string PV Grid-Connected Inverter (hereinafter referred to as the
“inverter”).
This document gives a description of the SPI-B2S series inverter, 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 illustration, details please take the actual product as standard.
Suitable Model
SPI1500-B2S,SPI2000-B2S,SPI3000-B2S,SPI3600-B2S,SPI4000-B2S,
SPI4600-B2S,SPI5000-B2S, SPI6000-B2S
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.
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.

Foreword
PV Grid-Connected Inverter SPI-B2S Series
(1500-6000) User Manual
iv
All rights reserved ©Xiamen Kehua Digital Energy Tech Co.,Ltd
Symbol
Description
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.
Product standard: NB/T 32004-2013

PV Grid-Connected Inverter SPI-B2S Series
(1500-6000) User Manual
Contents
All rights reserved ©Xiamen Kehua Digital Energy Tech Co.,Ltd
v
Contents
1 Safety Description.........................................................................................................................1
1.1 Safety Announcements ......................................................................................................................................1
1.1.1 Safety Instructions....................................................................................................................................1
1.1.2 Protection for PV Array............................................................................................................................3
1.1.3 Anti-Static Protection ...............................................................................................................................3
1.1.4 Grounding Requirements .........................................................................................................................3
1.1.5 Moisture-proofProtection .........................................................................................................................4
1.1.6 Safety Warning Label Setting...................................................................................................................4
1.1.7 Electrical Connection ...............................................................................................................................4
1.1.8 Measure with Electricity ..........................................................................................................................5
1.2 Requirements for Operator ................................................................................................................................5
1.3 Environment Requirements ...............................................................................................................................5
2 Overview.........................................................................................................................................7
2.1 Product Intro ......................................................................................................................................................7
2.1.1 Model Meaning ........................................................................................................................................7
2.1.2 Product Features.......................................................................................................................................7
2.2 Appearance and Structure..................................................................................................................................8
2.2.1 Operation Panel ........................................................................................................................................8
2.2.2 External Terminal Illustration...................................................................................................................9
2.3 Work Principle .................................................................................................................................................10
3 Installation Guide ....................................................................................................................... 12
3.1 Installation Process ..........................................................................................................................................12
3.2 Installation Preparation....................................................................................................................................12
3.2.1 Tools .......................................................................................................................................................12

Contents
PV Grid-Connected Inverter SPI-B2S Series
(1500-6000) User Manual
vi
All rights reserved ©Xiamen Kehua Digital Energy Tech Co.,Ltd
3.2.2 Installation Environment ........................................................................................................................13
3.2.3 Installation Space ...................................................................................................................................14
3.2.4 Installation Way......................................................................................................................................15
3.3 Transportation and unpacking .........................................................................................................................15
3.3.1 Transportation.........................................................................................................................................15
3.3.2 Unpacking and Checking .......................................................................................................................16
3.4 Installation .......................................................................................................................................................17
3.5 Electrical Connection ......................................................................................................................................20
3.5.1 Wire Requirement...................................................................................................................................20
3.5.2 External GroundingConnection..............................................................................................................21
3.5.3 DC Input (PV) Connection.....................................................................................................................22
3.5.4 AC Output (GRID) Connection..............................................................................................................24
3.5.5 WIFI/GPRS Connection.........................................................................................................................27
3.5.6 Communication Port Connection (Optional) .........................................................................................27
3.6 Check the Installation ......................................................................................................................................30
4 LCD Operation ............................................................................................................................31
4.1 First Startup .....................................................................................................................................................31
4.2 Main Page ........................................................................................................................................................31
4.3 Main Menu Page..............................................................................................................................................32
4.3.1 Running Information ..............................................................................................................................33
4.3.2 Power Query...........................................................................................................................................34
4.3.3 Record Query .........................................................................................................................................34
4.3.4 System Setting........................................................................................................................................36
4.3.5 System Information ................................................................................................................................39
5 Startup and shutdown................................................................................................................40
5.1 Startup..............................................................................................................................................................40
5.2 Shutdown .........................................................................................................................................................40
6 Maintenance and Troubleshooting .........................................................................................41
6.1 Maintenance.....................................................................................................................................................41

PV Grid-Connected Inverter SPI-B2S Series
(1500-6000) User Manual
Contents
All rights reserved ©Xiamen Kehua Digital Energy Tech Co.,Ltd
vii
6.2 Troubleshooting ...............................................................................................................................................41
6.3 Australian Standard Special Instructions .........................................................................................................44
6.3.1 Ground Fault Instructions.......................................................................................................................44
6.3.2 PV/QV Mode Setting Instructions .........................................................................................................44
6.3.3 WIFI Connection and APP Operation Mode..........................................................................................47
6.3.4 Additional RCDInstructions...................................................................................................................47
7 Package, Transportation and Storage......................................................................................48
7.1 Package............................................................................................................................................................48
7.2 Transportation..................................................................................................................................................48
7.3 Storage .............................................................................................................................................................48
A Technical Specifications ........................................................................................................... 49
B Acronyms and Abbreviations ..................................................................................................53

PV Grid-Connected Inverter SPI-B2S Series
(1500-6000) User Manual
1Safety Description
All rights reserved ©Xiamen Kehua Digital Energy Tech Co.,Ltd
1
1 Safety Description
This chapter introduces the safety announcements. Please read this user manual carefully prior to
installing the inverter. It provides important information on safe and efficient installation.
1.1 Safety Announcements
Before operation, please read the announcements and operation instructions in this part, which is to
avoid accident.
The DANGER, WARNING, CAUTION in the manual, are not all the safety announcements that must
be abided by, they are just the supplement of the safety announcements during operating.
Kehua Company does not undertake the responsibility caused by violating common safety operation
requirements or the safety standard of design, manufacture and use.
1.1.1 Safety Instructions
It is prohibited touching any terminal or conductor that connected with grid circuit, or, it may cause
deadly danger.

1Safety Description
PV Grid-Connected Inverter SPI-B2S Series
(1500-6000) User Manual
2
All rights reserved ©Xiamen Kehua Digital Energy Tech 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.
The damaged device or device fault may cause electric shock or firing!
Before operating, please inspect the device and see if there is any damage or exist other danger.
Check if the external devices 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 75℃. During running, please don't touch the
surface to avoid scald.
No liquid or other objects are allowed to enter the inverter.

PV Grid-Connected Inverter SPI-B2S Series
(1500-6000) User Manual
1Safety Description
All rights reserved ©Xiamen Kehua Digital Energy Tech Co.,Ltd
3
In case fire, please use dry power fire extinguisher. If using liquid fire extinguisher, it may cause electric
shock.
1.1.2 Protection for PV Array
When install the PV array in the daytime, use light-proof material to cover the PV array, or, under the
sunshine, the PV array will generate high voltage. Once touch the PV array by accident, it may cause
electric shock or endanger human life.
There is deadly high voltage between the positive and negative of the PV array.
During installing, ensure that the connection between inverter and PV array is completely disconnected
and set warning marks at the disconnection to avoid reconnecting by accident.
1.1.3 Anti-Static Protection
The static electricity generated by human bodies may damage the electrostatic-sensitive components
on boards. Before touching the sensitive component, please wear anti-static rings and well connect the
other end of the anti-static rings to ground.
1.1.4 Grounding Requirements
High leakage risk! The inverter must be grounded before electrical connection. The ground terminal
must be connected to earth.
When installing, connect the grounding wire first; when dismantling, the grounding wire must be
removed at last.
It is prohibited to damage the grounding conductor.

1Safety Description
PV Grid-Connected Inverter SPI-B2S Series
(1500-6000) User Manual
4
All rights reserved ©Xiamen Kehua Digital Energy Tech Co.,Ltd
The device must be connected with protection earthing permanently. Before operating, please
check the electric connection and ensure the device has been connected to earth reliably.
1.1.5 Moisture-proof Protection
Moisture incursion may cause the inverter damage!
For normal use of the energy-storage converter, please comply with the following items.
If the atmosphere humidity larger than 95%, please do not open the inverter.
On overcast or rainy or moist condition, avoid opening panel to maintain or do other operation.
1.1.6 Safety Warning Label Setting
To avoid irrelevant person close to or misoperate the inverter, during installation or daily maintenance,
please abide by the related standards.
Set warning labels at the front end and back end of the inverter to avoid wrongly close and even
cause accident.
Set warning label board or safety warning area to avoid irrelevant person entering and cause
human injury or device damage.
1.1.7 Electrical Connection
The electrical connection must be done on the basis of the illustration and electrical wiring principle
mentioned in this manual.
The PV array and grid level, frequency, etc. must accord with the inverter’s specification.
The grid-connected generation must be allowed by local power supply department and operate by
professionals.
All the electrical connection must accord with the electrical installation standard of local nation and
district.

PV Grid-Connected Inverter SPI-B2S Series
(1500-6000) User Manual
1Safety Description
All rights reserved ©Xiamen Kehua Digital Energy Tech Co.,Ltd
5
1.1.8 Measure with Electricity
There is dangerous high voltage, contacting by accident may lead to deadly danger. So, when measure
with electricity, it is necessary to do the protection (such as wear insulated gloves, etc.)
The measure meter must accord with the following requirements.
The range and sue condition of the measure meter should conform to the site requirements.
Ensure that connection of the measure meter is proper and normative, which is to avoid the
danger of electric arc, etc.
1.2 Requirements for Operator
The related operation and wiring for the inverter should be performed by qualified professionals, and
ensure the electric installation accord with the electricity installation standards.
The installation and maintenance man should be trained and know each safety announcements and get
the right operation method, and then, the installation, operation and maintenance can be done.
The operator should be familiar with the constitution and work principle of the whole PV grid-
connected generation system.
The operator must be acquainted with the related standards of local nation and region.
1.3 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.

1Safety Description
PV Grid-Connected Inverter SPI-B2S Series
(1500-6000) User Manual
6
All rights reserved ©Xiamen Kehua Digital Energy Tech 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 long time.
The place where beyond the specification (normal work 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 Grid-Connected Inverter SPI-B2S Series
(1500-6000) User Manual
2Overview
All rights reserved ©Xiamen Kehua Digital Energy Tech Co.,Ltd
7
2 Overview
This chapter mainly introduces the inverter features, appearance, operation panel, work principle, etc.
2.1 Product Intro
The inverter is the device that converts DC energy from solar array into AC energy and then feedbacks
to power grid. It is suitable for home and commercial roof PV generation system and distributed PV
generation system. Generally, the system consists of PV arrays, PV Grid-Connected Inverter and power
distribution system, as shown in Figure2-1.
Inverter Grid
PV
arrays
Figure2-1 Compose of PV generation system
2.1.1 Model Meaning
SPI □□□□ - B 2 S Hardware version
SPI series PV grid-tied inverter
Output power
Without insulation
Figure2-2 Model meaning illustration
As shown in Figure2-2, SPI means that the product is Kehua’s SPI series PV Grid-Connected
Inverter, □□□□ means the output power of the inverter, when it is 5000, it means the output
power is 5000VA, B means the inverter is without isolation, 2 means that the inverter is the second
version.S means the inverter is with DC isolator.
2.1.2 Product Features
Efficiently power generation: adopt efficient HERIC inverter topology and advanced completely
digitized control technology.
Safe and reliable: adopt aluminium alloy to diecast the outer case, so that the inverter can work in
a widely temperature range.
Smart manage: smart cloud platform monitor and APP monitor. The inverter supports RS485,
GPRS and WIFI communication, and can be updated online.
Green and friendly: small size, easy installation and use, air cooling, low noise.
__ With DC isolator

2Overview
PV Grid-Connected Inverter SPI-B2S Series
(1500-6000) User Manual
8
All rights reserved ©Xiamen Kehua Digital Energy Tech Co.,Ltd
Better adaptability: with better grid adaptability, wide reactive power adjusting range.
2.2 Appearance and Structure
The appearance of the inverter is as shown in Figure2-3.
Figure2-3 Appearance of the inverter
2.2.1 Operation Panel
Figure2-4 Operation panel
Table2-1 Illustration of the operation panel
NO
Mark
Illustration
Remarks
○
1
-
LCD
Shows the inverter status and information.
Shows the service and operation information
Shows the alarm information and fault.
○
2
Power indicator
(green)
On: inverter is in grid-connected status.
Flicker: PV power is normal
○
3
Alarm indicator
On: inverter fault.

PV Grid-Connected Inverter SPI-B2S Series
(1500-6000) User Manual
2Overview
All rights reserved ©Xiamen Kehua Digital Energy Tech Co.,Ltd
9
NO
Mark
Illustration
Remarks
(red)
Off: there is no fault.
○
4
ESC button
Short press: move the cursor upward or increase the setting value.
Long press: back to previous menu or cancel the current
command.
○
5
ENT button
Short press: move the cursor downward or decrease the setting
value.
Long press: enter sub menu or confirm the current command.
Short press: less than 1s, Long press: more than 1s.
2.2.2 External Terminal Illustration
The external terminals are all located in the bottom of the inverter, including PV input, AC output,
communication port and DC ISOLATOR, etc, as shown in Figure2-5.
Figure2-5 Bottom view
Table2-2 Terminals illustration
NO.
Mark
Illustration
Remarks
○
1
DC
ISOLATOR
DC transform switch
○
2
PV
+
DC input terminal
For SPI1500-B2Sand SPI2000-B2S, there are
1pair of DC terminals(+,-), for other models,
there are 2
-
DC ISOLATOR

2Overview
PV Grid-Connected Inverter SPI-B2S Series
(1500-6000) User Manual
10
All rights reserved ©Xiamen Kehua Digital Energy Tech Co.,Ltd
NO.
Mark
Illustration
Remarks
pairs of DC terminals (+,-)
○
3
WIFI/GPRS
WIFI/GPRS port
It is used to monitor the running status of the
inverter.
○
4
COM.
Connect with DRM,
METER
Optional
○
5
GRID
AC output terminal
It is used to connect with grid.
○
6
-
Lock
It needs to provide bycustomer.
○
7
Grounding port
External grounding port
When the COM. Is not selected, the corresponding port is filled with a waterproof plug.
DC Isolator
DC Isolator (as shown in Figure2-5○ 1 ) is the connection switch of inverter and PV array. When the
inverter works normally, the DC Isolator must be ON. During installation and wiring, the DC Isolator
must be OFF. Before maintenance, the DC Isolator must be OFF for 20 minutes, and measure the
voltage of DC busbar by multimeter, only when the voltage less than 10V, the maintenance can be done.
when maintenance or wiring, the DC Isolator must be disconnected.
2.3 Work Principle
The inverter connects with PV array input and tracks the maximum power point of the PV array, and
then converts the DC power into single-phase AC power by inverter circuit. It also provides
surge protection at DC and AC side, as shown inFigure2-6, Figure2-7.
Please note that inverters should not be used in multiple phase combinations.

PV Grid-Connected Inverter SPI-B2S Series
(1500-6000) User Manual
2Overview
All rights reserved ©Xiamen Kehua Digital Energy Tech Co.,Ltd
11
DC switch
PV+
PV-
Input filter
optional
DC
SPD
DC
DC
Boost
circuit
DC
AC
Inverter
circuit
LC filter
Output relay
Output filter
L
NGRID
AC
SPD
PE
Figure2-6 Work principle diagram of SPI1500-B2, SPI2000-B2
DC switch
+
-
Input filter
Optional
DC
SPD
DC
DC
Boost
circuit 1
DC
AC
Inverter
circuit
LC filter
Output relay
Output filter
L
NGRID
AC
SPD
PE
PV1
+
-
Input filter
DC
SPD
Boost
circuit 2
PV2
DC
DC
Figure2-7 Work principle diagram of SPI3000-B2S, SPI3600-B2S, SPI4000-B2S, SPI4600-B2S, SPI5000-
B2S, SPI6000-B2S

3Installation Guide
PV Grid-Connected Inverter SPI-B2S Series
(1500-6000) User Manual
12
All rights reserved ©Xiamen Kehua Digital Energy Tech Co.,Ltd
3 Installation Guide
This chapter introduces the installation of the inverter, including installation process, installation
preparation, transportation and unpacking, installation procedure, electrical connection and checking,
etc.
3.1 Installation Process
Start
Install the
inverter
Electrical
connection
Check the
installation
End
Installation
preparation
Figure3-1 Installation process
3.2 Installation Preparation
3.2.1 Tools
Tools