Sungrow SG125HX User manual

User Manual
PV Grid-Connected Inverter
SG125HX
SG125HX-UEN-Ver14-202105
WWW.SUNGROWPOWER.COM

I
All Rights Reserved
AAllll RRiigghhttss RReesseerrvveedd
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").
TTrraaddeemmaarrkkss
and other Sungrow trademarks used in this manual are owned by
SUNGROW.
All other trademarks or registered trademarks mentioned in this manual are owned by
their respective owners.
SSooffttwwaarree LLiicceennsseess
•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.

II
About This Manual
The manual mainly contains the product information, as well as guidelines for installation,
operation and maintenance. The manual does not include complete information about
the photovoltaic (PV) system. The reader can get additional information about other
devices at wwwwww..ssuunnggrroowwppoowweerr..ccoomm or on the webpage of the respective component
manufacturer.
VVaalliiddiittyy
This manual is valid for the following inverter models:
•SG125HX
They will be referred to as "inverter" hereinafter unless otherwise specified.
TTaarrggeett GGrroouupp
This manual is intended for inverter owners who will have the ability to interact with the
inverter and qualified personnel who are responsible for the installation and
commissioning of the inverter. Qualified personnel should have the following skills:
•Training for installation and commissioning of electrical system, as well as dealing
with hazards
•Knowledge of the manual and other related documents
•Knowledge of the local regulations and directives
HHooww ttoo UUssee TThhiiss MMaannuuaall
Read the manual and other related documents before performing any work on the
inverter. Documents must be stored carefully and be available at all times.
Contents may be periodically updated or revised due to the product development. The
manual content of subsequent versions of the inverter may be subject to change. The
latest manual can be found at ssuuppppoorrtt..ssuunnggrroowwppoowweerr..ccoomm.
SSyymmbboollss
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.
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.

III
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.

V
CCoonntteennttss
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
2 Product Description .................................................................................... 4
2.1 System Introduction ..................................................................................... 4
2.2 Product Introduction..................................................................................... 5
2.3 Symbols on the Product ............................................................................... 7
2.4 LED Indicator ............................................................................................... 7
2.5 Circuit Diagram ............................................................................................ 8
2.6 Function Description .................................................................................... 9
3 Unpacking and Storage ........................................................................... 12
3.1 Unpacking and Inspection.......................................................................... 12
3.2 Inverter Storage ......................................................................................... 12
4 Mechanical Mounting .............................................................................. 13
4.1 Safety during Mounting .............................................................................. 13
4.2 Location Requirements .............................................................................. 13
4.2.1 Environment Requirements............................................................... 14
4.2.2 Carrier Requirements........................................................................ 14
4.2.3 Angle Requirements ......................................................................... 14
4.2.4 Clearance Requirements .................................................................. 15
4.3 Installation Tools......................................................................................... 15
4.4 Moving the Inverter .................................................................................... 17
4.4.1 Manual Transport ............................................................................. 17
4.4.2 Hoisting Transport ............................................................................ 18
4.5 Installing the mounting-bracket .................................................................. 19
4.5.1 PV Bracket-Mounted Installation ....................................................... 19
4.5.2 Wall-Mounted Installation ................................................................. 20
4.6 Installing the Inverter .................................................................................. 21

VI
5 Electrical Connection ............................................................................... 23
5.1 Safety Instructions...................................................................................... 23
5.2 Terminal Description................................................................................... 23
5.3 Electrical Connection Overview .................................................................. 24
5.4 Crimp OT/DT terminal................................................................................. 28
5.5 Additional Grounding Connection ............................................................... 29
5.5.1 Additional Grounding Requirements.................................................. 29
5.5.2 Connection Procedure...................................................................... 29
5.6 AC Cable Connection ................................................................................. 30
5.6.1 AC Side Requirements...................................................................... 30
5.6.2 Requirements for OT/DT Terminal ..................................................... 32
5.6.3 Connection Procedure...................................................................... 32
5.7 DC Cable Connection................................................................................. 37
5.7.1 PV Input Configuration...................................................................... 37
5.7.2 Assembling the PV Connectors ......................................................... 38
5.7.3 Installing the PV Connector ............................................................... 39
5.8 Communication Junction Box..................................................................... 41
5.9 Communication Wiring Board..................................................................... 42
5.10 RS485 Connection................................................................................... 42
5.10.1 Interface Description ...................................................................... 42
5.10.2 RS485 Communication System ...................................................... 43
5.10.3 Connection Procedure(Terminal Block) ........................................... 45
5.10.4 Connection Procedure (RJ45 Ethernet Port).................................... 46
5.11 PLC Communication Connection.............................................................. 48
5.12 Dry Contact Connection ........................................................................... 48
5.12.1 Dry Contact Function...................................................................... 48
5.12.2 Wiring Procedure............................................................................ 50
5.13 Communication Module Connection (optional) ......................................... 50
6 Commissioning ........................................................................................... 52
6.1 Inspection before Commissioning............................................................... 52
6.2 Commissioning Procedure ......................................................................... 52
7 iSolarCloud App .......................................................................................... 53
7.1 Brief Introduction........................................................................................ 53
7.2 Installing the App........................................................................................ 53
7.3 Function Overview ..................................................................................... 54
7.4 Login.......................................................................................................... 54

VII
7.4.1 Requirements................................................................................... 54
7.4.2 Login Procedure............................................................................... 54
7.5 Home page................................................................................................ 56
7.6 Run Information ......................................................................................... 58
7.7 Records ..................................................................................................... 60
7.8 More.......................................................................................................... 62
7.8.1 System Parameters .......................................................................... 62
7.8.2 Operation Parameters ...................................................................... 63
7.8.3 Power Regulation Parameters........................................................... 64
7.8.4 Communication Parameters ............................................................. 69
7.8.5 Firmware Update.............................................................................. 69
7.8.6 Password Changing ......................................................................... 71
8 System Decommissioning ...................................................................... 72
8.1 Disconnecting the Inverter.......................................................................... 72
8.2 Dismantling the Inverter.............................................................................. 72
8.3 Disposal of the Inverter............................................................................... 73
9 Troubleshooting and Maintenance ...................................................... 74
9.1 Troubleshooting ......................................................................................... 74
9.2 Maintenance.............................................................................................. 85
9.2.1 Maintenance Notices........................................................................ 85
9.2.2 Routine Maintenance........................................................................ 86
9.2.3 Cleaning Air Inlet and Outlet .............................................................. 86
9.2.4 Fan Maintenance ............................................................................. 86
10 Appendix .................................................................................................... 88
10.1 Technical Data ......................................................................................... 88
10.2 Wring Distance of DI Dry Contact ............................................................. 89
10.3 Quality Assurance .................................................................................... 91
10.4 Contact Information ................................................................................. 91

1
1Safety
The device 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 device.
Incorrect operation or work may cause:
•Injury or death to the operator or a third party;
•Damage to the device and other properties.
All detailed work-related safety warnings and notes are 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, gloves, etc.
•Before touching the DC cables, operator must use a measuring device to
ensure that the cable is voltage-free.
•The opeator must follow all warnings on the PV strings and in its manual.
1.2 Utility Grid
Follow the regulations related to the utility grid.

2
All electrical connections must be in accordance with local and national
standards.
Only with the permission of the local utility grid company, the inverter can be
connected to the utility grid.
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 warranty
and warranty claims and in most cases terminate the operating license.
Risk of inverter damage or personal injury
•Do not connect or disconnect the PV and AC connectors when the inverter is
running.
•Wait at least 5 minutes for the internal capacitors to discharge after all
electric devices are removed and the inverter is powered off.
•Ensure that there is no voltage or current before connecting or disconnecting
the PV and AC connectors.
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 the heat sink) during operation. Only the DC
switch can safely be touched at any time.
1 Safety User Manual

3
Only qualified personnel can perform the country setting. Unauthorized
alteration may cause a breach of the type-certificate marking.
Risk of inverter damage due to electrostatic discharge (ESD)!
By touching the electronic components, you may damage the inverter. For
inverter handling, be sure to:
•avoid any unnecessary touching;
•wear a grounding wristband before touching any connectors.
User Manual 1 Safety

4
2Product Description
2.1 System Introduction
The inverter is a transformerless 3-phase PV grid-connected inverter. As 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 to
feed the AC current into the utility grid.
The intended usage of the inverter is illustrated in the following figure.
ffiigguurree 22--11 Inverter Application in PV Power System
The inverter must not be connected to a PV string that requires positive or
negative grounding.
Do not connect any local load between the inverter and the AC circuit breaker.
IItteemm DDeessccrriippttiioonn NNoottee
APV strings Monocrystalline silicon, polycrystalline silicon and thin-film
without grounding.
B Inverter SG125HX
CGrid connection
cabinet
Includes devices such as AC circuit breaker, SPD, metering
device.
D Transformer Boost the low voltage from the inverter to grid-compatible
medium voltage.
EUtility grid TN-C, TN-S, TN-C-S, TT, IT.
The following figure shows the common grid configurations.

5
Make sure the inverter is applied to an IT system before enabling the Anti-PID
function.
2.2 Product Introduction
MMooddeell DDeessccrriippttiioonn
The model description is as follows :
AAppppeeaarraannccee
The following figure shows the dimensions of the inverter. The image shown here is for
reference only. The actual product received may differ.
User Manual 2 Product Description

6
ffiigguurree 22--22 Inverter Appearance
NNoo.. NNaammee DDeessccrriippttiioonn
1 LED indicator To indicate the current working state of the inverter.
2 AC Wire Box To connect AC cables in this area.
3 Bottom handles To move the inverter.
4Wiring area DC switches, DC terminals, and communication terminals.
For details, refer to"5.2 Terminal Description"
5 Side handles To move the inverter.
6 Side handles To move the inverter.
7Nameplate
To clearly identify the product, including device model, S/
N, important specifications, marks of certification
institutions, etc.
8
Additional
grounding
terminals
Use at least one of them to ground the inverter.
DDiimmeennssiioonnss
The following figure shows the dimensions of the inverter.
2 Product Description User Manual

7
ffiigguurree 22--33 Dimensions of the Inverter(in mm)
2.3 Symbols on the Product
SSyymmbbooll EExxppllaannaattiioonn
Do not dispose of the inverter together with household waste.
TÜV mark of conformity.
CE mark of conformity.
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
maintenance!
Burn danger due to the hot surface that may exceed 60°C.
Do not touch live parts for 5 minutes after disconnection from the
power sources.
Read the user manual before maintenance!
Additional grounding point.
* The table shown here is for reference only. The actual product received may differ.
2.4 LED Indicator
The LED indicator on the front of the inverter indicates the working state of the inverter.
User Manual 2 Product Description

8
table 2-1 State description of the LED indicator
LLEEDD ccoolloorr SSttaattee DDeeffiinniittiioonn
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 blink
(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.
Gray
OFF Both the AC and DC sides are powered down.
2.5 Circuit Diagram
The following figure shows the main circuit of the inverter.
ffiigguurree 22--44 Circuit Diagram
•The DC switch is used to safely disconnect the DC circuit.
•The MPPT is utilized for DC input to ensure the maximum power from the PV array at
different PV input conditions.
•The inverter circuit converts the DC power into AC power and generates AC power to
loads or utility grid through the AC terminal.
•The protection circuit ensures the safe operation of the device and personal safety.
2 Product Description User Manual

9
2.6 Function Description
The inverter is equipped with the following functions:
CCoonnvveerrssiioonn FFuunnccttiioonn
The inverter converts the DC current into grid-compatible AC current and feeds the AC
current into the grid.
DDaattaa SSttoorraaggee
The inverter logs running information, error records, etc.
PPaarraammeetteerr CCoonnffiigguurraattiioonn
The inverter provides various settable parameters. Users can set parameters via the
App to meet the requirements and optimize the performance.
CCoommmmuunniiccaattiioonn IInntteerrffaaccee
The inverter is designed with standard RS485 communication interfaces.
The standard RS485 communication interfaces are used to establish communication
connection with monitoring devices and upload monitoring data by using
communication cables.
After communication connection is established, users can view inverter information or
set inverter parameters through the iSolarCloud.
PPLLCC FFuunnccttiioonn
The PLC function is mainly to use the three-phase AC cable to achieve data scheduling
and collection.
In order to achieve data scheduling, each PV unit adopts one-master-multi-slave
structure. COM100A sends scheduling message, which is modulated into high-
frequency signals by the PLC host, and the three-phase AC cable is used as a medium
for broadcasting. The slave receives and demodulates the high-frequency signals and
sends them to the MCU of the inverter.
To realize data collection, COM100A sends collection message, which is modulated into
high-frequency signals by the PLC host, and the three-phase AC cable is used as a
medium for polling. The slave receives and demodulates the high-frequency signals and
sends them to the MCU of the inverter. The MCU modulates the acquired data into high-
frequency signals, which are received and demodulated by the master to upload to the
COM100A.
PPrrootteeccttiioonn FFuunnccttiioonn
The protective functions are integrated in the inverter, including anti-island protection,
LVRT/HVRT, DC reversed polarity protection, AC short circuit protection, leakage current
protection, DC overvoltage/overcurrent protection, etc.
PPootteennttiiaall IInndduucceedd DDeeggrraaddaattiioonn ((PPIIDD))
The PID effect (Potential Induced Degradation) of PV modules will cause serious
damage to generated output and yield, which can be avoided or recovered by setting
PID recovery function.
User Manual 2 Product Description

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•Anti-PID function
When the inverter is running, the PID module rises the potential between the negative
pole of the PV array and the ground to a positive value, to suppress the PID effect.
Make sure the inverter is applied to an IT system before enabling the anti-PID
function.
•PID recovery function
For positive voltage scheme, after the PID is enabled, the voltage to ground of all PV
strings is greater than 0, and therefore the PV string-to-ground voltage is a positive
value.
For negative voltage scheme, after the PID is enabled, the voltage to ground of all PV
strings is lower than 0, and therefore the PV string-to-ground voltage is a negative 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 the corresponding user manual.
•If the voltage scheme for the PID protection/recovery function does not meet
the requirement of corresponding PV modules, the PID will not work as
expected or even damage the PV modules.
•If the PID recovery function is enabled, it only works at night.
•PID recovery function and Q at night cannot be enabled at the same time.
•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.
2 Product Description User Manual