KEHUA TECH SPI-B Series User manual

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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
SPI-B Series (30K-60K) String PV Grid-tied Inverter
User Manual
ii
All rights reserved ©Kehua Hengsheng Co., Ltd.
Foreword
Summaries
Thank you for choosing the SPI-B series (30K-60K) 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
SPI30K-B
SPI33K-B
SPI36K-B
SPI40K-B
SPI50K-B
SPI60K-B
SPI30K-B, SPI33K-B and SPI36K-B have six routes of DC input, SPI40K-B has nine routes of DC input,
SPI50K-B and SPI60K-B has twelve routes of DC input, the SPI-B series (30K-60K) string PV grid-tied
inverter is similar. The figures in this manual takes SPI60K-B for an example.
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.

SPI-B Series (30K-60K) String PV Grid-tied Inverter
User Manual
Foreword
All rights reserved ©Kehua Hengsheng Co., Ltd.
iii
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.
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 004 (2020-04-10)
Add machines of SPI30K-B, SPI33K-B, SPI36K-B.
Issue 003 (2020-01-10)
Delete WIFI configuration illustration.
Issue 002 (2019-10-16)
UpdateAC connection and operation interface.
Issue 001 (2019-07-08)
First issue.

Contents
SPI-B Series (30K-60K) String PV Grid-tied Inverter
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
1.3 Operation Environment Requirements.............................................................................................................6
2 Overview.........................................................................................................................................7
2.1 Product Intro.....................................................................................................................................................7
2.1.1 Apperance ...............................................................................................................................................7
2.1.2 Model Meaning.......................................................................................................................................8
2.1.3 Features...................................................................................................................................................8
2.1.4 Grid Mode...............................................................................................................................................8
2.2 Compoments ....................................................................................................................................................9
2.2.1 Operation Panel.......................................................................................................................................9
2.2.2 DC Switch.............................................................................................................................................10
2.3 Working Principle........................................................................................................................................... 11
3 Installation....................................................................................................................................12
3.1 Installation Process.........................................................................................................................................12

SPI-B Series (30K-60K) String PV Grid-tied Inverter
User Manual
Contents
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3.2 Installation Preparation ..................................................................................................................................13
3.2.1 Installation Tools...................................................................................................................................13
3.2.2 Installation Environment.......................................................................................................................14
3.2.3 Installation Clearance............................................................................................................................14
3.3 Handling, Unpacking and Checking ..............................................................................................................14
3.3.1 Handling................................................................................................................................................14
3.3.2 Unpacking and Checking......................................................................................................................15
3.4 Inverter Installation ........................................................................................................................................15
3.5 Electrical Connection.....................................................................................................................................19
3.5.1 Electrical Connection Announcements .................................................................................................21
3.5.2 DC Connection......................................................................................................................................22
3.5.3 AC Connection......................................................................................................................................24
3.5.4 com. Communication Connection.........................................................................................................26
3.5.5 WIFI/GPRS Communication Connection(Optional) ............................................................................30
3.6 Check the Installation.....................................................................................................................................31
4 Operation Interface.....................................................................................................................32
4.1 Initial Wizard..................................................................................................................................................32
4.2 Main Interface................................................................................................................................................34
4.3 Main Menu.....................................................................................................................................................34
4.3.1 Running Information.............................................................................................................................35
4.3.2 Power Query .........................................................................................................................................37
4.3.3 Record Query........................................................................................................................................39
4.3.4 Setting...................................................................................................................................................42
4.3.5 ON/ OFF ...............................................................................................................................................54
4.3.6 About.....................................................................................................................................................55
5 Startup and Shutdown ...............................................................................................................57
5.1 Start Inverter...................................................................................................................................................57
5.2 Shut Down Inverter........................................................................................................................................57
6 Maintenance and Troubleshooting .........................................................................................58

Contents
SPI-B Series (30K-60K) String PV Grid-tied Inverter
User Manual
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All rights reserved ©Kehua Hengsheng Co., Ltd.
6.1 Maintenance...................................................................................................................................................58
6.2 Troubleshooting..............................................................................................................................................58
7 Package, Transportation, Storage.............................................................................................62
7.1 Package ..........................................................................................................................................................62
7.2 Transportation ................................................................................................................................................62
7.3 Storage ...........................................................................................................................................................62
A Technical Specifications ...........................................................................................................63
B Acronyms and Abbreviations ..................................................................................................76

SPI-B Series (30K-60K) String PV Grid-tied Inverter
User Manual
1 Safety Description
All rights reserved ©Kehua Hengsheng Co., Ltd.
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！

1 Safety Description
SPI-B Series (30K-60K) String PV Grid-tied Inverter
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.

SPI-B Series (30K-60K) String PV Grid-tied Inverter
User Manual
1 Safety Description
All rights reserved ©Kehua Hengsheng Co., Ltd.
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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.

1 Safety Description
SPI-B Series (30K-60K) String PV Grid-tied Inverter
User Manual
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All rights reserved ©Kehua Hengsheng Co., Ltd.
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;
Device should be connected to the protection earth permanently. 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.

SPI-B Series (30K-60K) String PV Grid-tied Inverter
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1 Safety Description
All rights reserved ©Kehua Hengsheng Co., Ltd.
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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.

1 Safety Description
SPI-B Series (30K-60K) String PV Grid-tied Inverter
User Manual
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All rights reserved ©Kehua Hengsheng Co., Ltd.
1.3 Operation Environment Requirements
The operation environment may influence the life span and reliability of device. So, please avoid to
use device in following environment:
The place where temperature and humidity beyond the technical specifications (temperature:
-25℃～60℃; relative humidity: 0%-95%).
The place with direct sunshine or rain.
The place with vibration or impact.
The place with dust, corrosive material, salt or burnable gas.
The place with poor ventilation or closed situation.
The place where close to resident living quarter.

SPI-B Series (30K-60K) String PV Grid-tied Inverter
User Manual
2 Overview
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2 Overview
This chapter mainly describes product introduction, components and working principle, 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 commercial roof grid-tied system and large power station grid-tied system.
The PV grid-tied generation system consists of PV array, PV grid-tied inverter,
transformer(According to practical application) and power distribution system, as shown Figure2-1.
Transformer Power grid
PV grid-tied
inverter
PV array
Figure2-1 PV grid-tied generation system
2.1.1 Apperance
The appearance of SPI-B series (30K-60K) string PV grid-tied inverter is as shown in Figure2-2.
Figure2-2 Appearance

2 Overview
SPI-B Series (30K-60K) String PV Grid-tied Inverter
User Manual
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2.1.2 Model Meaning
The model meaning of SPI-B series (30K-60K) string PV grid-tied inverter is as shown in Figure2-3.
SPI K-B
SPI series PV grid-tied inverter
Output power
Non-isolated type
Figure2-3 Model meaning
As shown in Figure2-3, "SPI" means that the product is Kehua SPI series PV gird-tied inverter; "口K
" means output power, when"口K" is 60K, it means that the output power is 60kVA; "B" means that
the product is the non-insolated type inverter.
2.1.3 Features
Adopts the efficient type-T three level high frequency conversion technology and advanced full
digital control technology.
Adopts the advanced disturbance detection technology to realize the anti-island running
protection.
Equipped with perfect protection function and the nighttime loss is low.
The reactive power is adjustable, the range of power factor is -0.8(lag)～+0.8(ahead).
The active power can be adjusted form 5% to 100% continuously.
2.1.4 Grid Mode
The inverter supports five kinds of grid modes: TN-S, TN-C, TN-C-S, TT and IT, as shown in
Figure2-4.
Figure2-4 Grid mode

2 Overview
SPI-B Series (30K-60K) String PV Grid-tied Inverter
User Manual
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Type
Mark
Color
Meaning
Status
Illustration
Green
WIFI/GPRS
indicator
ON
WIFI/ GPRS has been connected
OFF
WIFI/ GPRS has been disconnected
Red
Fault indicator
ON
The inverter has protection action.
Button
There are four buttons on the front panel of inverter, the button function is as shown in Table2-2.
Table2-2 Button function
Button
Function
ESC
Return/ quit
▲
Page up/ number "+"/ select option
▼
Page down/ number "-"/ select option
Enter/ confirm/ save/ select number bit
LCD touch screen
The inverter adopts 3.5 inch color touch screen, the display information includes：
The running status and information of inverter.
Service and operation information.
Alarm and fault information.
2.2.2 DC Switch
DC switch connects the inverter with PV array. When the inverter works normally, the DC switch
must be in the “ON”position. When wiring, set the DC switch in the “OFF”position. When
maintenance, set the DC switch in the “OFF”position and wait for 30 minutes, then check whether
the DC busbar voltage inside the device is less than 10V or not by multimeter. If yes, the maintenance
can be done. The position of DC switch is as shown in Figure2-6.

SPI-B Series (30K-60K) String PV Grid-tied Inverter
User Manual
2 Overview
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Figure2-6 DC switch
When maintenance or wiring, it should switch off DC switch.
2.3 Working Principle
PV array input connected with inverter, which will combine into n routes of MPPT circuits inside the
inverter to do the max. power point tracking. Then convert the DC power into three-phase AC power
through inverting circuit and support the surge protection in the DC side and AC side, the details refer
to Figure2-7.
-
+
MPPT1
-
+U
V
W
Three level
inverting
-
+
+
+
-
-
-
+
+
-
-
-
+
BUS
Input EMI
filtering
LCL
filtering
Output relay
Output EMI
filtering
AC SPD
N
PE
PV1+
PV1-
PV2+
PV2-
PV3+
PV3-
PV3n-2+
PV3n-2-
PV3n-1+
PV3n-1-
PV3n+
PV3n-
DC SPD
DC switch DC switch
MPPTn
.
.
.
.
.
.
.
.
.
.
.
.
+
Input EMI
filtering
Optional
Figure2-7 Working principle diagram

3 Installation
SPI-B Series (30K-60K) String PV Grid-tied Inverter
User Manual
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3 Installation
This chapter mainly introduces the inverter's installation, including installation process, installation
preparation, handling, unpacking and checking, installation procedures, electrical connection. check
the installation ,etc.
3.1 Installation Process
The installation process of inverter is as shown in Figure3-1.
Start
Electrical
connection
Check the
installation
End
Installation
preparation
Install the
inverter
Install optional
components
Figure3-1 Installation process