KEHUA TECH SPI-B Series User manual

PV Grid-tied Inverter
SPI-B Series (75K-150K)
User Manual

All rights reserved ©Kehua Data Co., Ltd.
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.
KEHUA DATA 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

PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
Foreword
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Foreword
Summaries
Thank you for choosing the PV grid-tied inverter (hereinafter referred to as inverter)!
This document gives a description of the inverter, including appearance, features, working principles,
installation, electrical connection, operation, maintenance and storage, 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.
Applicable Model
SPI75K-B
SPI80K-B
SPI90K-B
SPI100K-B
SPI110K-B
SPI125K-B
SPI136K-BHV
SPI150K-BHV
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.

PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
Foreword
All rights reserved ©Kehua Data Co., Ltd.
iii
Symbol
Description
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.
Product standard: Q/XMHS 003

PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
Contents
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iv
Contents
1 Safety Description.........................................................................................................................1
1.1 Safety Announcements.....................................................................................................................................1
1.1.1 Use Announcements................................................................................................................................1
1.1.2 PV String Protection ...............................................................................................................................3
1.1.3 ESD Protection........................................................................................................................................3
1.1.4 Grounding Requirements........................................................................................................................3
1.1.5 Moistureproof Protection........................................................................................................................4
1.1.6 Warning Mark Setting.............................................................................................................................4
1.1.7 Electrical Connection..............................................................................................................................4
1.1.8 Measurement Under Operation...............................................................................................................5
1.2 Operator Requirements ....................................................................................................................................5
2 Overview.........................................................................................................................................6
2.1 Product Intro.....................................................................................................................................................6
2.1.1 Features...................................................................................................................................................7
2.1.2 Model Meaning.......................................................................................................................................8
2.2 Apperance and Structure ..................................................................................................................................8
2.2.1 Appearance..............................................................................................................................................8
2.2.2 Operation Panel.......................................................................................................................................9
2.2.3 Bottom Layout......................................................................................................................................10
2.2.4 Size .......................................................................................................................................................12
2.3 Working Principle...........................................................................................................................................12
2.4 Communication..............................................................................................................................................12
2.4.1 RS485 Communication.........................................................................................................................12
2.4.2 WiseSolar+APP.....................................................................................................................................13

PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
Contents
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2.4.3 PLC Communication (Optional)...........................................................................................................14
2.5 PID Function (Optional).................................................................................................................................16
3 Installation....................................................................................................................................18
3.1 Installation Process.........................................................................................................................................18
3.2 Installation Tools............................................................................................................................................19
3.3 Selection of Installation Site ..........................................................................................................................20
3.3.1 Installation Environment.......................................................................................................................20
3.3.2 Installation Clearance............................................................................................................................21
3.3.3 Installation Carrier Requirements.........................................................................................................23
3.3.4 Installation Method...............................................................................................................................23
3.4 Transporting, Unpacking and Checking.........................................................................................................24
3.4.1 Transporting..........................................................................................................................................24
3.4.2 Unpacking and Checking......................................................................................................................26
3.5 Inverter Installation........................................................................................................................................26
3.5.1 Bracket Installation...............................................................................................................................26
3.5.2 Wall Mounting ......................................................................................................................................29
3.6 Electrical Connection.....................................................................................................................................33
3.6.1 Safety Announcements..........................................................................................................................33
3.6.2 Wire Requirements................................................................................................................................34
3.6.3 External Grounding Connection ...........................................................................................................35
3.6.4 AC Output Wiring.................................................................................................................................37
3.6.5 Internal Grounding Connection.............................................................................................................42
3.6.6 PV String Input Wiring.........................................................................................................................43
3.6.7 Communication Connection .................................................................................................................48
3.7 Check the Installation.....................................................................................................................................50
4 Startup and Shutdown ...............................................................................................................51
4.1 Check Before Startup.....................................................................................................................................51
4.2 Start Inverter...................................................................................................................................................51
4.3 Shut Down Inverter........................................................................................................................................52

PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
Contents
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vi
5 Maintenance and Troubleshooting .........................................................................................53
5.1 Maintenance...................................................................................................................................................53
5.1.1 Maintenance Details and Period............................................................................................................53
5.1.2 Maintenance Guide...............................................................................................................................54
5.2 Troubleshooting..............................................................................................................................................56
6Stop Running, Dismantle, Discard Inverter..........................................................................59
6.1 Stop Running..................................................................................................................................................59
6.2 Dismantle the Inverter....................................................................................................................................60
6.3 Discard the Inverter........................................................................................................................................60
7Package, Transportation, Storage.............................................................................................61
7.1 Package ..........................................................................................................................................................61
7.2 Transportation ................................................................................................................................................61
7.3 Storage ...........................................................................................................................................................61
A Technical Specifications...........................................................................................................62
B Torque Specifications................................................................................................................67
C Quality Assurance......................................................................................................................68
D Acronyms and Abbreviations..................................................................................................70

PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
1 Safety Description
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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
This section mainly describes the safety announcements when operation and maintenance. For details,
please refer to safety description in relevant chapters.
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!

PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
1 Safety Description
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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 device damage caused by illegal operation is out of the
guarantee range.
After disconnect the input and output of the inverter, there still has residual energy in the storage
capacitor, which may cause electric shock. Do not perform the maintenance until all power sources
are switched off for 30 minutes and check that there is no voltage and current in the inverter by the
detection equipment.
Please do not put fingers or tools into the rotating fans to avoid human injury or device damage.
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, or, it may cause inverter damage.
In case of fire, please use dry power fire extinguisher. If using liquid fire extinguisher, it may cause
electric shock.

PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
1 Safety Description
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1.1.2 PV String Protection
When install PV string in daytime, it necessary to cover the PV string by light-proof material, or the
PV string will generate high voltage under sunshine. If touching PV string accidently, it may cause
electric shock or human injury!
There exists dangerous voltage between the positive and negative of PV string!
When installing the device, make sure that the connection between inverter and PV string has been
disconnected completely. And set warning mark in the disconnected position to avoid reconnecting.
1.1.3 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.
1.1.4 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.

PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
1 Safety Description
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1.1.5 Moistureproof Protection
Moisture invasion may cause inverter damage!
Observe the following items to ensure the inverter works normally.
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.
1.1.6 Warning Mark 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.
1.1.7 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.

PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
1 Safety Description
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1.1.8 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.
1.2 Operator Requirements
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.

PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
2 Overview
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2 Overview
This chapter mainly introduces product appearance, structure, working principles and communication
method, etc.
2.1 Product Intro
The inverter converts the DC energy from PV string into AC energy and then feedbacks to power grid,
which is suitable for the large power station grid-tied system. The PV grid-tied generation system
consists of PV string, PV grid-tied inverter, transformer and power distribution system, as shown in
Figure2-1.
Figure2-1 PV grid-tied generation system
PV grid-tied power generation needs to obtain the permission of local power supply department and
performed by professionals.
SPI75K-B, SPI80K-B, SPI90K-B, SPI100K-B, SPI110K-B and SPI125K-B su pport five grid forms, that
is TN-S, TN-C, TN-C-S, TT and IT; SPI136K-BHV and SPI150K-BHV support the IT grid form, as
shown in Figure2-2.

PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
2 Overview
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Inverter
IT
PE
L1
L2
L3
Inverter
TT
PE
L1
L2
L3
N
Inverter
Transformer
TN-S
PE
L1
L2
L3
N
Inverter
TN-C
L1
L2
L3
PE/N
Inverter
TN-C-S
L1
L2
L3
N
PE
PE
PE
PE
Transformer Transformer
Transformer Transformer
Figure2-2 Grid form
2.1.1 Features
1100V high voltage input, increasing efficiency and cost reduction.
Full voltage adaptation, strong grid support, and adaptability to complex power grid.
Adjustable reactive power, the range of power factor is -0.8 (lag) ～+0.8 (ahead) .
Include smart I-V scanning, fault wave capture, remote online upgrade.
Adopt intelligent fan control and fault detection.
Various options, such as Anti-PID module, GPRS/WIFI remote APP monitoring, and local
WIFI+APP intelligent operation and maintenance, for flexible choice.
Support PLC communication, night SVG function, friendly grid response, which can save cost
for the power station construction.
Sub-array controller can be selected to quickly response the power station instruction.
Easy maintenance with bluetooth.
Adopt the modular design, which is convenient for maintenance. The vulnerable parts can be
dismantled easily, and it will save the maintenance cost.
Perfect protection functions: island protection, high/low voltage ride through, DC reverse
protection, AC short circuit protection, leakage current protection, surge protection, etc.

PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
2 Overview
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2.1.2 Model Meaning
The model meaning of SPI75K-B, SPI80K-B, SPI90K-B,SPI100K-B,SPI110K-B,SPI125K-B is as
shown in Figure2-3.
SPI □□□K-B
Product series mark
SPI series string PV grid-tied inverter
Rated output power mark
When it is 75, it means the rated output power is 75kVA;
When it is 80, it means the rated output power is 80kVA.
Isolation type mark
"B" means non-isolated type.
Figure2-3 Model meaning of SPI75K-B, SPI80K-B, SPI90K-B, SPI100K-B, SPI110K-B and SPI125K-B
The model meaning of SPI136K-BHV, SPI150K-BHV is as shown in Figure2-4.
SPI □□□K-BHV
Product series mark
SPI series string PV grid-tied inverter
Rated output power mark
When it is 136, it means the rated output power is 136kVA;
When it is 150, it means the rated output power is 150kVA.
Voltage type mark
"HV" means high-voltage.
Isolation type mark
"B" means non-isolated type.
Figure2-4 Model meaning of SPII136K-BHV and SPI150K-BHV
2.2 Apperance and Structure
2.2.1 Appearance
The appearance of SPI-B series (75K-150K) is as shown in Figure2-5.

PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
2 Overview
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Figure2-5 Appearance
2.2.2 Operation Panel
There are 5 status indicators on the front panel of the inverter, which can indicate the current working
status of the inverter. The status of each indicator is shown in Table2-1.
Figure2-6 Operation panel
Table2-1 Indicator status illustration
NO.
Mark
Color
Meaning
Status illustration
○
1
Green
PV string
indicator
ON: At least a group of PV string has been
connected.
Flicker: Night SVG mode grid-tied status.
OFF: All PV strings are disconnected.
○
2
Green
Grid indicator
ON: Grid-tied status.
Flicker: Inverter decreases the rated power.
OFF: No grid-tied status.
○
3
Green
WIFI/GPRS
ON: WIFI/ GPRS has been connected.

PV Grid-tied Inverter SPI-B Series (75K-150K)
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NO.
Mark
Color
Meaning
Status illustration
indicator
OFF: WIFI/ GPRS has been disconnected.
○
4
Red
Fault indicator
ON: The inverter has alarm.
○
5
Green
Bluetooth
indicator
ON: Bluetooth has been connected with APP.
Flicker: Bluetooth has been disconnected with APP.
OFF: Bluetooth is abnormal.
2.2.3 Bottom Layout
The bottom layout of inverter is as shown in Figure2-7.
Figure2-7 Bottom layout
The SPI136K-BHV, SPI150K-BHV have 10 routes MPPT, the SPI75K-B, SPI80K-B, SPI90K-B,
SPI100K-B, SPI110K-B, SPI125K-B have 9 routes MPPT, for details refers to A Technical
Specifications. If there is no special explanation, the following we will take SPI125K-B as an example
to explain.
Table2-2 Bottom layout illustration
NO.
Mark
Name
Remarks
○
1
B+/B-
Energy storage interface
(reserved)
Connect battery.

PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
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NO.
Mark
Name
Remarks
○
2
DC SWITCH
DC switch
DC switch connects inverter with
PV string. Each DC switch controls
the PV strings in the corresponding
marked area.
○
3
MPPT n+ /MPPT n-
PV string terminal
Connect PV string.
○
4
-
Breather valve
Adjust the pressure difference of
inverter.
○
5
WIFI/GPRS
WIFI/GPRS interface
Connect WIFI/GPRS stick.
○
6
AC OUTPUT
AC output wiring hole
For AC output wiring.
○
7
Internal grounding wiring hole
For internal grounding wiring.
○
8
N
Neutral wire wiring hole
For neutral wire wiring.
○
9
COM1/COM2
Communication wiring hole
For RS485 wiring or DRM wiring.
DC Switch
The DC switch (as shown in the ○ 2 of Figure2-7) connects inverter with the PV string. Switch off
the DC switch in the following situations for safety consideration.
When installation and wiring, the DC switch must be set to OFF position.
When checking and maintenance, the DC switch must be set to OFF position and wait for 30
minutes. Do not perform maintenance until there is no output voltage and current in the inverter
(checked by detection equipment) and the DC bus voltage inside inverter is less than 10V.

PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
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2.2.4 Size
Figure2-8 Size (unit: mm)
2.3 Working Principle
PV strings are connected to inverter, and do the max. power point tracking for PV strings through the
multi-groups of MPPT circuits inside inverter to achieve the max. power output of PV strings, and
then convert the DC power into the three-phase AC power through the inverter circuit, as shown in
Figure2-9 (take 9 groups of MPPT as an example) .
Output
EMI filter
Relays
SPD
CHCT
HCT
HCT
( –)
( + )
( –)
( + )
( –)
( + )
MPPT1 C
( –)
( + )
+
–
DC/DC1
DC/DC9
…
L1
L2
L3
PE
Input
EMI filter
…… ……
SPD
GND
GND
DC switch
L1 L2 L3
MPPT9
DC/AC
Figure2-9 Working principle diagram
2.4 Communication
The inverter has multiple communication methods, including RS485 communication, bluetooth
communication, WIFI/GPRS communication (optional) , and PLC communication (optional) . User
can easily obtain the running information of the inverter.
2.4.1 RS485 Communication
RS485 communication (as shown in Figure2-10) is mainly used for LAN monitoring, which can
realize the background remote monitoring.

PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
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Figure2-10 The position of RS485 communication interface
……
Inverter N
Monitoring
platform
Inverter 2Inverter 1
N≤20
Figure2-11 RS485 communication (multiple inverters)
When there is only one inverter adopts the RS485 communication, either of the two communication
interfaces can be connected.
2.4.2 WiseSolar+APP
WiseSolar+APP can communicate with inverter through bluetooth to realize the short-distance
maintenance. User can perform the information query, alarm query, event query, parameter setting,
log download, etc. of inverter through APP.
If the GPRS/WIFI/4G stick made in Kehua is selected, WiseSolar+ APP can communicate with
inverter through mobile data network or WIFI to realize the remote maintenance.
Download and install WiseSolar+APP:
Method 1: search WiseSolar+ and download the WiseSolar+APP through the following
application market, and the install the WiseSolar+ APP.
−Application market (Android Chinese user) ;
−Google Play (Excluding Chinese user) ;