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.
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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

Foreword
PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
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All rights reserved ©Kehua Data Co., Ltd.
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

Contents
PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
iv
All rights reserved ©Kehua Data Co., Ltd.
Contents
1 Safety Description.........................................................................................................................1
1.1 Safety Announcements.....................................................................................................................................1
1.1.1 Use Announcements................................................................................................................................1
1.1.2 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.........................................................................................................................13
2.4.2 WIFI/GPRS Communication (Optional)...............................................................................................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 Requirements for Installation Carrier....................................................................................................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 ......................................................................................................................................30
3.6 Electrical Connection.....................................................................................................................................33
3.6.1 Safety Announcements..........................................................................................................................33
3.6.2 Requirements for Wire..........................................................................................................................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 WIFI/GPRS Communication Connection(Optional) ............................................................................47
3.6.8 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

Contents
PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
vi
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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 Quality Assurance ......................................................................................................................67
C Acronyms and Abbreviations..................................................................................................69

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 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.
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！

1 Safety Description
PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
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All rights reserved ©Kehua Data Co., Ltd.
There is no operational part inside the inverter. Please do not open the crust of the inverter by
yourself, or it may cause electric shock. The 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.

1 Safety Description
PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
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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 circuit schematic.
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.

2 Overview
PV Grid-tied Inverter SPI-B Series (75K-150K)
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 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.
The grid form supported by the inverter is shown in Figure2-2.

PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
2 Overview
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Inverter
Transformer
IT
PE
L1
L2
L3
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.
⚫The reactive power is adjustable, the range of power factor is -0.8(lag)～+0.8(ahead).
⚫Smart I-V scanning, fault wave capture, remote online update function.
⚫Perfect protection functions: island protection, high/low voltage ride through, reverse DC
connection protection,AC short circuit protection, leakage current protection, surge protection,
etc.
⚫Intelligent fan control and fault detection are used for the inverter
⚫Options such asAnti-PID module, GPRS/WIFI remoteAPP monitoring, and local WIFI+APP
intelligent operation and maintenance, which can flexibly provide customers with a combination
of relevant needs.
⚫The inverter support PLC communication, night SVG function, friendly grid response, these
functions can save cost for the power station construction.
⚫Sub-array controller option can response to station instruction quickly.
⚫Easy maintenance with bluetooth.
⚫The inverter system is modular design, which is convenient maintenance and overhaul. It's
relevant vulnerable parts can be dismantle easily, without machine replacement and low
maintenance cost.

2 Overview
PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
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2.1.2 Model Meaning
The model description 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 PV grid-tied inverter.
Rated output power mark
When it is 80, that means the rated power of the
UPS is 80kVA;
When it is 90, that means the rated power of the
UPS is 90kVA;
And so on.
Isolation type mark
“B”represents non-isolated power.
Figure2-3 Model meaning
The model description of SPI136K-BHV,SPI150K-BHV is as shown in Figure2-4.
SPI □□□K-BHV
Product series mark
SPI series PV grid-tied inverter.
Rated output power mark
When it is 136, that means the rated power
of the UPS is 136kVA;
When it is 150, that means the rated power
of the UPS is 150kVA;
And so on.
Voltage type mark
“HV”represents high-voltage.
Isolation type mark
“B”represents non-isolated power.
Figure2-4 Model meaning
2.2 Apperance and Structure
2.2.1 Appearance
The appearance of the inverter 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 stay in decrease rated power
output status.
OFF: No grid-tied status.

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User Manual
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NO.
Mark
Color
Meaning
Status illustration
○
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.
○
5
Green
Bluetooth indicator
ON: Bluetooth has been connected with APP.
Flicker: Bluetooth has been disconnected with
APP.
OFF: Bluetooth is in abnormal working
status.
2.2.3 Bottom Layout
The inverter's bottom layout is shown as in Figure2-7.
Figure2-7 Bottom layout
SPI136K-BHV,SPI150K-BHV has 10 routes MPPT with maximum current 30A (6 routes optional, max.
current of per MPPY is 40A), SPI80K-B, SPI90K-B, SPI100K-B, SPI110K-B, SPI125K-B has 9 routes
MPPT with max. current 30A (6 routes optional, max. current of per MPPT is 40A), SPI75K-B has 9
routes MPPT with max. current 30A (7 routes optional, max. current of per MPPT is 40A).
The above figure takes SPI125K-B as an example to illustrate. If there is no special explanation, the
following we will take SPI125K-B as an example to explain.

PV Grid-tied Inverter SPI-B Series (75K-150K)
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Table2-2 Mark description
NO.
Mark
Name
Remarks
○
1
B+/B-
Energy storage (reserved)
Used to connect battery input.
○
2
DC SWITCH
DC switch
It is the connection switch between
inverter and PV string. Each DC
switch controls the PV string input
terminals of marked area.
○
3
MPPT n+/MPPT n-
PV string input terminal
Used to connect PV string input.
○
4
-
Breather valve
Used to balance the pressure
difference between inside and outside
of the inverter.
○
5
WIFI/GPRS
WIFI/GPRS interface
Used to WIFI/GPRS connection and
communication
○
6
AC OUTPUT
AC output wiring hole
Used to connect the wire of AC
output.
○
7
Internal grounding hole
For internal grounding.
○
8
N
Grounding wiring hole
Used to connect the wire of neutral
wire
○
9
COM1/COM2
Communication wiring hole
Used to connect the wire of RS485 or
DRM
DC Switch
The DC switch (the position is shown as ○ 2 in Figure2-7) is the connection switch between the
inverter and the PV string, when necessary, it can safely disconnect the connection of the inverter and
the PV string. In order to ensure the safety of the operator, make sure that the DC switch is turned off
under the following conditions:
⚫When installing and wiring, the DC switch must be placed in OFF position.

2 Overview
PV Grid-tied Inverter SPI-B Series (75K-150K)
User Manual
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All rights reserved ©Kehua Data Co., Ltd.
⚫When checking and repairing, place the DC switch to OFF position and wait for 30 minutes. Do
not perform the maintenance until the DC bus voltage inside the inverter lower than 10V and
check that there is no voltage and current in the inverter by the detection equipment.
2.2.4 Size
Figure2-8 Size (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 9 groups of MPPT circuits to achieve the maximum power output of the
PV string, and then the conversion of DC power to three-phaseAC power is realized through the
inverter circuit, as shown in Figure2-9.
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). Users
can easily obtain the current operation data of the inverter.