KEHUA TECH SPI-B-H Series SPI175K-B-H User manual

String PV Grid-tied Inverter
SPI-B-H Series (175K-250K)
User Manual

All rights reserved ©Kehua Hengsheng Co., Ltd.
i
Copyright © KehuaHengshengCo.,Ltd.2020.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 KehuaHengshengCo.,Ltd.
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and other Kehua trademarks are trademarks of KehuaHengsheng 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 HENGSHENG CO.,LTD.
Address:
No.457,MalongRoad,TorchHigh-TechIndustrialZone,Xiamen,Fujian,China
Manufacturer:
ZHANGZHOU KEHUA TECHNOLOGYCO.,LTD.
Postal Code:
361000(XIAMEN), 363000(ZHANGZHOU)
Website:
www.kehua.com
E-mail:
[email protected]
The Customer Service
Telephone:
400-808-9986
Tel:
0592-5160516
Fax:
0592-5162166

Foreword
String PV Grid-tied Inverter SPI-B-H Series (175K-250K)
User Manual
ii
All rights reserved ©Kehua Hengsheng Co., Ltd.
Foreword
Summaries
Thank you for choosing the SPI-B series (175K-250K) string PV grid-tied inverter(Hereinafter
referred to as inverter)!
This document gives a description of inverter, including the 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
SPI175K-B-H
SPI200K-B-H
SPI225K-B-H
SPI250K-B-H
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 meaningas follows.
Symbol
Description
Alerts you to a high risk hazard that could, if not avoided, result in
serious injury or death.
Alerts you to a medium or low risk hazard that could, if not avoided,
result in moderate or minor injury.

String PV Grid-tied Inverter SPI-B-H Series (175K-250K)
User Manual
Foreword
All rights reserved ©Kehua Hengsheng Co., Ltd.
iii
Symbol
Description
Alerts you to a potentially hazardous situation that could, if not
avoided, result in equipment damage, data loss, performance
deterioration, or unanticipated results.
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
Change History
Changes between document issues are cumulative. The latest document issue contains all the changes
made in earlier issues.
Issue 001 (2020-06-09)
First issue.

Contents
String PV Grid-tied Inverter SPI-B-H Series (175K-250K)
User Manual
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All rights reserved ©Kehua Hengsheng Co., Ltd.
Contents
1 Safety Description.........................................................................................................................1
1.1 Safety Announcements.....................................................................................................................................1
1.1.1 Use Announcements................................................................................................................................1
1.1.2 PV Array Protection................................................................................................................................3
1.1.3 ESD Protection........................................................................................................................................3
1.1.4 Grounding Requirements........................................................................................................................4
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.......................................................................................................................................7
2.2 Apperance and Structure ..................................................................................................................................8
2.2.1 Apperance ...............................................................................................................................................8
2.2.2 Operation Panel.......................................................................................................................................8
2.2.3 Floor layout.............................................................................................................................................9
2.2.4 Dimension............................................................................................................................................. 11
2.3 Working Principle........................................................................................................................................... 11
2.4 Communication Method................................................................................................................................. 11
2.4.1 Ethernet Communication ...................................................................................................................... 11
2.4.2 RS485 Communication.........................................................................................................................12

String PV Grid-tied Inverter SPI-B-H Series
(175K-250K)
User Manual
Contents
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2.4.3 WIFI/GPRS Communication (Optional)...............................................................................................13
2.4.4 PLC Communication (Optional)...........................................................................................................14
3 Installation....................................................................................................................................15
3.1 Installation Process.........................................................................................................................................15
3.2 Installation Tools............................................................................................................................................15
3.3 Selection of installation site ...........................................................................................................................17
3.3.1 Installation Environment.......................................................................................................................17
3.3.2 Installation Clearance............................................................................................................................18
3.3.3 Installation method................................................................................................................................20
3.3.4 Installation carrier requirements ...........................................................................................................20
3.4 Handling, Unpacking and Checking ..............................................................................................................21
3.4.1 Handling................................................................................................................................................21
3.4.2 Unpacking and Checking......................................................................................................................23
3.5 Inverter Installation........................................................................................................................................23
3.5.1 Bracket installation ...............................................................................................................................23
3.5.2 Wall mounting.......................................................................................................................................27
3.6 Electrical Connection.....................................................................................................................................31
3.6.1 Safety Precautions.................................................................................................................................31
3.6.2 Cable requirements ...............................................................................................................................31
3.6.3 External ground connection ..................................................................................................................32
3.6.4 AC output wiring...................................................................................................................................34
3.6.5 Internal ground connection ...................................................................................................................38
3.6.6 PV string input wiring...........................................................................................................................39
3.6.7 WIFI/GPRS Communication Connection(Optional) ............................................................................43
3.6.8 COM.communication connection.........................................................................................................44
3.7 Check the Installation.....................................................................................................................................46
4 Startup and Shutdown ...............................................................................................................47
4.1 Start Inverter...................................................................................................................................................47
4.2 Shut Down Inverter........................................................................................................................................47

Contents
String PV Grid-tied Inverter SPI-B-H Series (175K-250K)
User Manual
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All rights reserved ©Kehua Hengsheng Co., Ltd.
5 Maintenance and Troubleshooting .........................................................................................48
5.1 Maintenance...................................................................................................................................................48
5.2 Troubleshooting..............................................................................................................................................49
6 Package, Transportation, Storage.............................................................................................52
6.1 Package ..........................................................................................................................................................52
6.2 Transportation ................................................................................................................................................52
6.3 Storage ...........................................................................................................................................................52
A Technical Specifications...........................................................................................................53
B Acronyms and Abbreviations ..................................................................................................61

String PV Grid-tied Inverter SPI-B-H Series (175K-250K)
User Manual
1Safety Description
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1
1 Safety Description
This chapter mainly describes 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, which is to avoid human injury and device damage by
irregular operations.
1.1 Safety Announcements
This section mainly describes the safety announcements when operation and maintenance. For details,
please refer to safety description in the 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 warranty range.
1.1.1 Use Announcements
Don't touch terminals or conductors that is connected with grid to avoid lethal risk！

1Safety Description
String PV Grid-tied Inverter SPI-B-H Series (175K-250K)
User Manual
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All rights reserved ©Kehua Hengsheng Co., Ltd.
There is no operational part inside device. Please do not open the crust of device by yourself, or it
may cause electric shock. The device damage caused by illegal operation is out of the guarantee
range.
Damaged device or device fault may cause electric shock or fire!
Before performing any work on the device, please check whether there is no damage or danger
in the device visually.
Check whether the connection for other external devices or circuits is safe.
After disconnect the input and output of the inverter, there still has residual energy in the storage
capacitor, which may cause electric shock. It can't do the maintenance until all power supply sources
are switched off for 30 minutes.
Please do not put finger or tool into the rotating fans to avoid human injury or device damage.
Danger of High Temperature
The surface temperature of inverter may reach to 75℃. During running, please don't touch the
surface to avoid scald.

String PV Grid-tied Inverter SPI-B-H Series (175K-250K)
User Manual
1Safety Description
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No liquid or other objects are allowed to enter the cabinet.
In case of fire, please use dry power fire extinguisher. If using liquid fire extinguisher, it may cause
electric shock.
1.1.2 PV Array Protection
When install PV array in daytime, it necessary to cover 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!
There exists dangerous voltage between the positive and negative of PV array!
When install device, it must disconnect inverter with PV array completely. Set warning mark here 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.

1Safety Description
String PV Grid-tied Inverter SPI-B-H Series (175K-250K)
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1.1.4 Grounding Requirements
High leakage risk! Device must be grounded before performing electrical connection. The grounding
terminal must be connected to ground.
When install device, it must be grounded first. When dismantle device, the grounding wire must
be removed at last;
Don't damage the grounding conductor;
Before operation, it should check the electrical connection to ensure the device is grounded
reliably.
1.1.5 Moistureproof Protection
Moisture invasion may cause inverter damage!
Observe the following items to ensure that inverter works normally.
When the air humidity is more than 95%, don't open the door of inverter;
In the wet or damp weather, don't open the door of inverter to perform maintenance or repair.
1.1.6 Warning Mark Setting
In order to avoid accident for unwanted person gets close to inverter or makes improper operation, it
should observe the following requirements when perform installation, daily maintenance or repair.
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 circuit schematic.

String PV Grid-tied Inverter SPI-B-H Series (175K-250K)
User Manual
1Safety Description
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The configuration of PV array, 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.
1.1.8 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.
Before install, operate and maintain device, the operator must understand the safety announcements,
know correct operations and be trained strictly.
Operator should know the structure and working principle of PV grid-tied generation system
well.
Operator must be familiar with the related country and district standard.

2Overview
String PV Grid-tied Inverter SPI-B-H Series (175K-250K)
User Manual
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2 Overview
This chapter mainly describes product appearance, structure, working principle and communication
method, etc.
2.1 Product Intro
The inverter converts the DC energy from PV array into AC energy and then feedbacks to power grid,
which is suitable for the large power station grid-tied system. The PV grid-tiedgeneration system
consists of PV array, PV grid-tied inverter, transformer (According to practical application) and
power distribution system, as shownFigure2-1.
Figure2-1 PV grid-tied generation system
Grid-tied photovoltaic power generation needs to obtain permission from the local power supply
department and invite professionals to perform relevant operations.
The grid form supported by inverter is shown in Figure2-2.

String PV Grid-tied Inverter SPI-B-H Series (175K-250K)
User Manual
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Inverter
Transformer
IT
PE
L1
L2
L3
Figure2-2 Grid mode
2.1.1 Features
Adopts the efficient three level high frequency conversion technology and advanced full digital
control technology.
Good power grid adaptability and excellent power quality.
The reactive power is adjustable, the range of power factor is -0.8(lag)～+0.8(ahead).
The active power can be adjusted form 0% to 100% continuously.
Perfect protection functions: island protection, high/low voltage ride through, reverse DC
connection protection, AC short circuit protection, leakage current protection, surge protection,
etc.
2.1.2 Model Meaning
SPI □□□K-B-H
Product series mark
SPI series PV grid-tied inverter.
Rated output power mark
When it is 175, that means the rated power of the UPS is 175kVA;
When it is 225, that means the rated power of the UPS is 225kVA;
And so on.
Voltage type mark
“H”represents high-voltage.
Isolation type mark
“B”represents non-isolated power.
Figure2-3 Model meaning

2Overview
String PV Grid-tied Inverter SPI-B-H Series (175K-250K)
User Manual
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2.2 Apperance and Structure
2.2.1 Apperance
The appearance of SPI-B-H series string PV grid-tied inverter is as shown in Figure2-4.
Figure2-4 Appearance
2.2.2 Operation Panel
There are 4 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.
Figure2-5 Operation panel
Table2-1 Indicator status illustration
NO.
Mark
Color
Meaning
Status illustration
○
1
Green
PV connection
indicator
ON: At least a group of PV has been connected.
Flicker: Night SVG mode grid-tied status
OFF: All PV are disconnected.

String PV Grid-tied Inverter SPI-B-H Series (175K-250K)
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NO.
Mark
Color
Meaning
Status illustration
○
2
Green
Grid connection
indicator
ON: Grid-tied status
Flicker: Inverter stay in decrease rated power
output status
OFF: No grid-tied status
○
3
Green
WIFI/GPRS
indicator
ON: WIFI/ GPRS has been connected
OFF: WIFI/ GPRS has been disconnected
○
4
Red
Fault indicator
ON: The inverter has alarm.
2.2.3 Floor layout
The inverter floor layout is shown as Figure2-6.
Figure2-6 Floor layout
SPI175K-B-H is 18 DC inputs. The connection identifiers MPPT10+ ~ MPPT12+, MPPT10- ~ MPPT12-
in Figure 2-6 are not installed with PV connectors, and they are plugged with plugs.
The above picture is illustrated with SPI225K-B-H. If there is no special explanation, the following will
take SPI225K-B-H as an example to explain.
Table2-2 Mark description
NO.
Mark
Name
Remarks
○
1
MPPT n +/MPPT n -
PV string input
terminal
Used to connect PV string input.

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NO.
Mark
Name
Remarks
○
2
DC SWITCH
DC switch
Connection switch between inverter and
PV string.
○
3
-
Breathable valve
Balance the pressure difference between
inside and outside of the machine.
○
4
WIFI/GPRS
WIFI/GPRS interface
WIFI/GPRS stick interface and
communication
○
5
AC OUTPUT
AC wiring inlet hole
AC output wiring
○
6
COM.
Communication inlet
hole
RS485 or Ethernet communication
wiring.
○
7
○
8
Internal ground inlet
hole
For internal ground
○
9
External ground
terminal
Used for reliable grounding of the
inverter.
DC Switch
The DC switch (the position is shown as ○ 2 in Figure2-6) is the connection switch between the
inverter and the PV string, and when necessary, it can safely disconnect. In order to ensure the safety
of the operator, make sure that the DC switch is turned off under the following conditions:
When installing the wiring, the DC switch must be placed in the OFF position.
When checking and repairing, you need to put the DC switch to the OFF position and wait for 30
minutes. Use a multimeter to test that the DC bus voltage inside the machine is below 10V before
you can perform repair work.

String PV Grid-tied Inverter SPI-B-H Series (175K-250K)
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2.2.4 Dimension
Figure2-7 Inverter dimensions (unit: mm)
2.3 Working Principle
The PV string input is connected to the inverter, and the maximum power point of the PV string is
tracked through the internal 12 groups of MPPT circuits to achieve the maximum power output of the
photovoltaic string, and then the conversion of DC power to three-phase AC power is realized
through the inverter circuit. As shown in 0.
Output
EMI
filtering
Relays
防雷器
PV24
CHCT
HCT
HCT
( –)
( + )
( –)
( + )
PV2
( –)
( + )
PV1
C
PV23 ( –)
( + )
PWM
+
–
GND
MPPT1
MPPT12
…
L1
L2
L3
PE
Input EMI
filtering
…… ……
SPD
GND
GND
DC switch
L1 L2 L3
Figure2-8 Working principle diagram
2.4 Communication Method
The inverter has multiple communication methods, including Ethernet communication, RS485
communication, WIFI/GPRS communication (optional), and PLC communication (optional). Users
can easily obtain the current system operation data of the inverter.
2.4.1 Ethernet Communication
Ethernet communication (the interface location is shown in Figure2-9) is mainly used for local area
network monitoring, which can realize the remote monitoring.

2Overview
String PV Grid-tied Inverter SPI-B-H Series (175K-250K)
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Figure2-9 Ethernet communication interface location
……
Inverter
Monitoring
platform
Inverter
Inverter
Router
Figure2-10 Ethernet monitoring (multiple inverters)
2.4.2 RS485 Communication
RS485 communication (the interface location is shown in Figure2-11) is mainly used for local area
network monitoring, which can realize the remote monitoring.