Sungrow SG25CX-SA User manual

SG25CX-SAPV
Grid-Connected InverterUser
ManualSG25CX-SA-UEN-Ver13-
202304
User Manual
PV Grid-Connected Inverter
SG25CX-SA
SG25CX-SA-UEN-Ver13-202304

I
All Rights Reserved
All Rights Reserved
No part of this document can be reproduced in any form or by any means without the prior
written permission of Sungrow Power Supply Co., Ltd(hereinafter "SUNGROW").
Trademarks
and other Sungrow trademarks used in this manual are owned by
Sungrow Power Supply Co., Ltd.
All other trademarks or registered trademarks mentioned in this document are owned by
their respective owners.
Software Licenses
• It is prohibited to use data contained in firmware or software developed by SUNGROW,
in part or in full, for commercial purposes by any means.
• It is prohibited to perform reverse engineering, cracking, or any other operations that
compromise the original program design of the software developed by SUNGROW.
Sungrow Power Supply Co., Ltd.
Address: No.1699 Xiyou Rd., New & High Tech Zone, Hefei, 230088, China.
Email: [e-mail]
Tel: [phone]
Website: www.sungrowpower.com

II
About This Manual
The manual mainly describes the product information, guidelines for installation, operation
and maintenance. The manual cannot include complete information about the photovoltaic
(PV) system. You can get additional information about other devices at www.
sungrowpower.com or on the webpage of the respective component manufacturer.
Validity
This manual is valid for the following inverter types:
• SG25CX-SA
They will be referred to as “inverter” hereinafter unless otherwise specified.
Target Group
This manual is intended for:
• qualified personnel who are responsible for the installation and commissioning of the
inverter; and
• inverter owners who will have the ability to interact with the inverter.
How to Use This Manual
Read the manual and other related documents before performing any work on the inverter is
carried out. Documents must be stored carefully and be available at all times.
The contents of the manual will be periodically updated or revised due to the product
development. It is probably that there are changes of manual in the subsequent inverter
edition. The latest manual can be acquired via visiting the website at www.sungrowpower.
com.
Symbols
Important instructions contained in this manual should be followed during installation,
operation and maintenance of the inverter. They will be highlighted by the following symbols.
Symbol Explanation
Indicates a hazard with a high level of risk that, if not avoided, will result
in death or serious injury.
Indicates a hazard with a medium level of risk that, if not avoided, could
result in death or serious injury.
Indicates a hazard with a low level of risk that, if not avoided, could
result in minor or moderate injury.
Indicates a situation that, if not avoided, could result in equipment or
property damage.
Indicates additional information, emphasized contents or tips that may
be helpful, e.g. to help you solve problems or save time.

III
Contents
All Rights Reserved .....................................................................................................I
About This Manual......................................................................................................II
1 Safety .................................................................................................................1
1.1 PV Panels......................................................................................................1
1.2 Utility Grid ......................................................................................................1
1.3 Inverter ..........................................................................................................2
1.4 Skills of Qualified Personnel ............................................................................3
2 Product Introduction .........................................................................................4
2.1 Intended Usage..............................................................................................4
2.2 Product Introduction........................................................................................5
2.2.1 Model Description .................................................................................5
2.2.2 Appearance..........................................................................................6
2.2.3 Dimensions ..........................................................................................6
2.2.4 LED Indicator Panel ..............................................................................7
2.2.5 DC Switch ............................................................................................7
2.3 Circuit Diagram ..............................................................................................7
2.4 Function Description .......................................................................................8
3 Unpacking and Storage .................................................................................10
3.1 Unpacking and Inspection .............................................................................10
3.2 Identifying the Inverter ..................................................................................10
3.3 Scope of Delivery .........................................................................................12
3.4 Inverter Storage ...........................................................................................12
4 Mechanical Mounting .....................................................................................14
4.1 Safety during Mounting .................................................................................14
4.2 Location Requirements .................................................................................14
4.2.1 Installation Environment Requirements.................................................14
4.2.2 Carrier Requirements ..........................................................................15
4.2.3 Installation Angle Requirements ...........................................................15
4.2.4 Installation Clearance Requirements ....................................................16
4.3 Installation Tools...........................................................................................19
4.4 Moving the Inverter.......................................................................................20

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4.4.1 Manual Transport................................................................................20
4.4.2 Hoisting Transport...............................................................................20
4.5 Dimensions of mounting-bracket....................................................................21
4.6 PV Bracket-Mounted Installation....................................................................22
4.6.1 Preparation before Mounting................................................................22
4.6.2 Mounting Steps...................................................................................22
4.7 Wall-Mounted Installation ..............................................................................24
4.7.1 Preparation before Mounting................................................................24
4.7.2 Mounting Steps...................................................................................25
5 Electrical Connection .....................................................................................28
5.1 Safety Instructions........................................................................................28
5.2 Terminal Description .....................................................................................28
5.3 Electrical Connection Overview .....................................................................30
5.4 Additional Grounding Connection...................................................................31
5.4.1 Additional Grounding Requirements .....................................................31
5.4.2 Connection Procedure.........................................................................31
5.5 AC Cable Connection ...................................................................................32
5.5.1 AC Side Requirements ........................................................................32
5.5.2 Requirements for OT/DT Terminal ........................................................34
5.5.3 Aluminium Cable Requirements ...........................................................34
5.5.4 Connection Procedure.........................................................................35
5.6 DC Cable Connection ...................................................................................38
5.6.1 PV Input Configuration ........................................................................38
5.6.2 Connection Procedure.........................................................................39
5.6.3 Installing the PV Connectors ................................................................40
5.7 Communication Junction Box ........................................................................42
5.7.1 Remove the Junction Box ....................................................................42
5.7.2 Install the Junction Box........................................................................42
5.8 Communication Wiring Board ........................................................................43
5.9 RS485 Communication .................................................................................43
5.9.1 Interface Description ...........................................................................43
5.9.2 RS485 Communication System............................................................44
5.9.3 Connection Procedure(Terminal Block).................................................46
5.9.4 Connection Procedure (RJ45 network port)...........................................47
5.10 Dry Contact Connection ..............................................................................49
5.10.1 Dry Contact Function.........................................................................49
5.10.2 Wiring Procedure ..............................................................................51

V
5.11 Wi-Fi Communication Module Connection ....................................................51
6 Commissioning ...............................................................................................53
6.1 Inspection before Commissioning ..................................................................53
6.2 Commissioning Procedure ............................................................................53
7 iSolarCloud App ..............................................................................................54
7.1 Brief Introduction ..........................................................................................54
7.2 Download and Install.....................................................................................54
7.3 Login ...........................................................................................................55
7.3.1 Requirements .....................................................................................55
7.3.2 Login Steps ........................................................................................55
7.4 Function Overview........................................................................................58
7.5 Home page ..................................................................................................58
7.6 Running Information .....................................................................................61
7.7 History Record .............................................................................................62
7.7.1 Fault Alarm Records............................................................................63
7.7.2 Power Yields Records .........................................................................64
7.7.3 Event Records ....................................................................................65
7.8 More............................................................................................................65
7.8.1 Parameter Setting ...............................................................................66
7.8.2 Firmware Update ................................................................................73
7.8.3 Password Changing ............................................................................74
8 System Decommissioning ............................................................................75
8.1 Disconnecting the Inverter.............................................................................75
8.2 Dismantling the Inverter ................................................................................75
8.3 Disposal of the Inverter .................................................................................76
9 Troubleshooting and Maintenance ..............................................................77
9.1 Troubleshooting ...........................................................................................77
9.2 Maintenance ................................................................................................85
9.2.1 Routine Maintenance ..........................................................................86
9.2.2 Maintenance Instruction.......................................................................86
10 Appendix .......................................................................................................89
10.1 Technical Data............................................................................................89
10.2 Wring Distance of DI Dry Contact.................................................................91
10.3 Quality Assurance ......................................................................................92
10.4 Contact Information ....................................................................................93

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1Safety
The inverter has been designed and tested strictly according to international safety
regulations. Read all safety instructions carefully prior to any work and observe them at all
times when working on or with the inverter.
Incorrect operation or work may cause:
• injury or death to the operator or a third party.
• damage to the inverter and other property safety of the operator or a third party.
All detailed work-related safety warnings and notes will be specified at critical points in this
manual.
The safety instructions in this manual cannot cover all the precautions that should
be followed. Perform operations considering actual onsite conditions.
SUNGROW shall not be held liable for any damage caused by violation of the
safety instructions in this manual.
1.1 PV Panels
PV strings will produce electrical power when exposed to sunlight and can cause a
lethal voltage and an electric shock.
• Always keep in mind that the inverter is dual power supplied. Electrical
operators must wear proper personal protective equipment: helmet, insulated
footwear, glove, etc.
• Before touching the DC cables, operator must use a measuring device to
ensure that the cable is voltage-free.
• Follow all warnings on the PV strings and in its manual.
1.2 Utility Grid
Please follow the regulations related to the utility grid.
All electrical connections must be in accordance with local and national standards.
Only with the permission of the utility grid, the inverter can be connected to the
utility grid.

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1.3 Inverter
Danger to life from electric shocks due to live voltage
• Do not open the enclosure at any time. Unauthorized opening will void
guarantee and warranty claims and in most cases terminate the operating
license.
Risk of inverter damage or personal injury
• Do not pull out the PV connectors when the inverter is running.
• Wait at least 5 minutes for the internal capacitors to discharge. Ensure that
there is no voltage or current before pulling any connector.
All safety instructions, warning labels, and nameplate on the inverter:
• Must be clearly legible.
• Should not be removed or covered.
Risk of burns due to hot components!
Do not touch any hot parts (such as heat sink) during operation. Only the DC
switch can safely be touched at any time.
Only qualified personnel can perform the country setting.
• Unauthorized alteration of the country setting may cause a breach of the type-
certificate marking.
By touching the electronic components, you may damage the inverter. For inverter
handling, be sure to:
• avoid any unnecessary touching;and,
• wear a grounding wristband before touching any connectors.
1 Safety User Manual

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Warning Label
Label Description
Danger to life due to high voltages!
Only qualified personnel can open and service the inverter.
Disconnect the inverter from all the external power sources
before service!
Do not touch live parts until 5 minutes after disconnection from
the power sources.
There is a danger from a hot surface that may exceed 60°C.
Check the user manual before service!
1.4 Skills of Qualified Personnel
All installations should be performed by qualified personnel. They should have:
• Training in the installation and commissioning of the electrical system, as well as the
dealing with hazards
• Knowledge of the manual and other related documents
• Knowledge of the local regulations and directives
User Manual 1 Safety

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2Product Introduction
2.1 Intended Usage
SG25CX-SA, a transformerless three-phase PV grid-connected inverter, is an integral
component in the PV power system.
The inverter is designed to convert the direct current power generated from the PV modules
into grid-compatible AC current and feeds the AC current to the utility grid. The intended
usage of the inverter is illustrated in "figure 2-1 Inverter application in PV power system".
figure 2-1 Inverter application in PV power system
Inverter cannot connect the PV strings whose positive and negative terminals
need to be grounded.
Do not connect any local load between the inverter and the AC circuit breaker.
During the installation and operation of the inverter, please ensure that the positive
or negative polarities of PV strings do not short-circuit to the ground. Otherwise,
an AC or DC short-circuit may occur, resulting in equipment damage. The damage
caused by this is not covered by the warranty.
Item Description Note
APV strings Monocrystalline silicon, polycrystalline silicon and
thin-film without grounding.
B Inverter SG25CX-SA.
CGrid connection
cabinet
Includes devices such as AC circuit breaker, SPD,
metering device.
D Transformer Boost the low voltage from inverter to grid-
compatible medium voltage.
EUtility grid TN-C, TN-S, TN-C-S, TT, IT.

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2.2 Product Introduction
2.2.1 Model Description
The device model description is as follows:
Model Nominal Output Power Nominal Grid Voltage
SG25CX-SA 25000W 3/N/PE AC 220/127 V
The device model can be found on the nameplate attached to the side of the inverter. For
details, refer to "3.2 Identifying the Inverter".
User Manual 2 Product Introduction

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2.2.2 Appearance
*The image shown here is for reference only. The actual product you receive may differ.
No. Name Description
1 LED indicator panel HMI interface to indicate the present working state of the
inverter.
2 Mounting ears 4, used to hang the inverter onto the mounting-bracket.
3 Side handles 2, used to move the inverter.
4 Labels Warning symbols, nameplate, and QR code.
5 Additional
grounding terminals
2, use at least one of them to ground the inverter.
6 Bottom handles 2, used to move the inverter.
7DC switch To disconnect the DC current safely.
8Wiring area
DC switches, AC terminals, DC terminals, and
communication terminals.
For details, refer to "5.2 Terminal Description".
2.2.3 Dimensions
figure 2-2 Dimensions of the Inverter
*The image shown here is for reference only. The actual product you receive may differ.
2 Product Introduction User Manual

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Type Dimensions (W*H*D) Weight
SG25CX-SA 782×645×310mm 54 kg
2.2.4 LED Indicator Panel
As an HMI, the LED indicator panel on the front of the inverter can indicate the present
working state of the inverter.
table 2-1 LED indicator description
LED
indicator LED state Definition
Blue
ON The device is connected to the grid and operating
normally.
Fast blink
(Period: 0.2s)
The Bluetooth communication is connected and
there is data communication.
No system fault occurs.
Slow flash
(Period: 2s) The device is in standby or startup state (not
feeding power into the grid).
Red
ON A fault occurs and the device cannot connect to the
grid
Twinkling
The Bluetooth communication is connected and
there is data communication.
System fault occurs.
OFF
OFF Both the AC and DC sides are powered down.
2.2.5 DC Switch
The DC switch is used to disconnect the DC current safely whenever necessary.
The inverter is equipped with one DC switch to control the connection and disconnection of
all DC terminals.
Turn the DC switch to the ON position before restarting the inverter.
2.3 Circuit Diagram
The MPPT is utilized for DC input to ensure the maximum power from the PV array at
different PV input conditions. The inversion circuit converts the DC power into AC power and
User Manual 2 Product Introduction

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feeds the AC power into the utility grid through the AC terminal. The protection circuit is
equipped to ensure the safe operation of the device and personal safety.
The following figure shows the main circuit of the inverter.
figure 2-3 Circuit diagram
2.4 Function Description
The inverter is equipped with the following functions:
Conversion function
The inverter converts the DC current into grid-compatible AC current and feeds the AC
current into the grid.
Data storage
The inverter logs running information, error records, etc.
Parameter setting
The inverter provides various settable parameters. Users can set parameters via the App to
meet the requirements and optimize the performance.
The inverter is designed with standard RS485 communication interfaces and
communication accessory port.
• The standard RS485 communication interfaces are used to establish communication
connection with monitoring devices and upload monitoring data by using communication
cables.
• The communication accessory port is used to connect Wi-Fi communication module
within the delivery scope, and upload monitoring data by means of wireless
communication.
The inverter can be connected to communication devices via either of the two interfaces.
After communication connection is established, users can view inverter information or set
inverter parameters through the iSolarCloud.
It is recommended to use the Wi-Fi communication module within the delivery
scope. Using a device from other companies may lead to communication failure
or other unexpected damage.
2 Product Introduction User Manual

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Protection Function
The protective functions are integrated in the inverter, including anti-island protection, LVRT/
ZVRT, DC reversed polarity protection, AC short circuit protection, leakage current
protection, DC overvoltage/overcurrent protection, etc.
PID function
After the PID function is enabled, the voltage to ground of all PV modules is greater than 0,
that is, the PV module-to-ground voltage is a positive value.
• Before enabling the PID recovery function, make sure the voltage polarity of the
PV modules to ground meets requirement. If there are any questions, contact
the PV module manufacturer or read its corresponding user manual.
• If the voltage scheme for the PID protection/recovery function does not meet
the requirement of corresponding PV modules, the PID function will not work as
expected or even damage the PV modules.
• PID recovery function
When the inverter is not running, the PID module will apply inverse voltage to PV modules,
to restore the degraded modules.
• If the PID recovery function is enabled, it only works at night.
• After the PID recovery function is enabled, the voltage of the PV string to
ground is 500Vdc by default, and the default value can be modified through
the App.
User Manual 2 Product Introduction

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3Unpacking and Storage
3.1 Unpacking and Inspection
The inverter is thoroughly tested and strictly inspected before delivery. Damage may still
occur during shipping. Conduct a thorough inspection after receiving the device.
• Check the packing for any visible damage.
• Check the inner contents for damage after unpacking.
• Check the delivery scope for completeness according to the packing list.
Contact SUNGROW or the supplier in case there is any damage or incompleteness.
Do not dispose of the original packing case. It is recommended to store the inverter in it.
3.2 Identifying the Inverter
The nameplate can be found on both the inverter and the packing case. It provides
information on type of inverter, important specifications, marks of certification institutions,
and serial number which are available and identified by SUNGROW.

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figure 3-1 Nameplate of Inverters
* The image shown here is for reference only. The actual product you receive may differ.
Item Description
1SUNGROW logo and product type
2 Technical data of inverter
3Instructions and marks of conformity
4Company name, website and country of manufacture
table 3-1 Description of Icons on the Nameplate
Icon Description
Do not dispose of the inverter together with household waste.
Refer to the corresponding instructions.
TÜV mark of conformity.
CE mark of conformity.
User Manual 3 Unpacking and Storage

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3.3 Scope of Delivery
figure 3-2 Scope of Delivery
a. The mounting-bracket includes 2 mounting-bracket components and 1 connecting bar.
b. The screws include 1 M4×25 screw, 3 M4×10 screws, and 2 M6×65 screws.
c. The documents include the quick installation guide, packing list, warranty card, etc.
3.4 Inverter Storage
Proper storage is required if the inverter is not installed immediately.
• Store the inverter in the original packing case with the desiccant inside.
• The storage temperature must be always between -40° C and +70° C, and the storage
relative humidity must be always between 0 and 95 %, non-condensing.
• In case of stacking storage, the number of stacking layers should never exceed the limit
marked on the outer side of the packing case.
3 Unpacking and Storage User Manual