Sungrow SG3.0RT User manual

SG3.0RT /
SG4.0RT / SG5.0RT / SG6.0RT /
SG7.0RT / SG8.0RT / SG10RT /
SG12RT / SG15RT / SG17RT /
SG20RT3-Phase PV Grid-Connected
InverterUser ManualSG3.0-20RT-
UEN-Ver16-202110
3-Phase PV Grid-Connected Inverter
User Manual
SG3.0RT / SG4.0RT / SG5.0RT / SG6.0RT / SG7.0RT /
SG8.0RT / SG10RT / SG12RT / SG15RT / SG17RT /
SG20RT
SG3.0-20RT-UEN-Ver16-202110

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.
All other trademarks or registered trademarks mentioned in this manual 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.

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
www.sungrowpower.com or on the webpage of the respective component manufacturer.
Validity
This manual is valid for the following inverter models:
• SG3.0RT
• SG4.0RT
• SG5.0RT
• SG6.0RT
• SG7.0RT
• SG8.0RT
• SG10RT
• SG12RT
• SG15RT
• SG17RT
• SG20RT
They will be referred to as "inverter" hereinafter unless otherwise specified.
Target Group
This manual is intended for inverter owners who will have the ability to interact with the inver-
ter 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
How to Use This Manual
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 man-
ual content of subsequent versions of the inverter may be subject to change. The latest man-
ual can be found at support.sungrowpower.com.

III
Symbols
Important instructions contained in this manual should be followed during installation, opera-
tion 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.
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
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
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 .................................................................................................8
2.5 Circuit Diagram ..............................................................................................8
2.6 Function Description.......................................................................................9
3 Unpacking and Storage .................................................................................13
3.1 Unpacking and Inspection .............................................................................13
3.2 Inverter Storage ...........................................................................................13
4 Mechanical Mounting .....................................................................................14
4.1 Safety during Mounting .................................................................................14
4.2 Location Requirements .................................................................................14
4.2.1 Environment Requirements..................................................................15
4.2.2 Carrier Requirements ..........................................................................15
4.2.3 Angle Requirements............................................................................15
4.2.4 Clearance Requirements .....................................................................16
4.3 Installation Tools...........................................................................................17
4.4 Moving the Inverter.......................................................................................18
4.5 Installing the Inverter.....................................................................................18
5 Electrical Connection .....................................................................................21
5.1 Safety Instructions........................................................................................21
5.2 Terminal Description .....................................................................................21
5.3 Electrical Connection Overview .....................................................................23
5.4 External Grounding Connection .....................................................................24

VI
5.4.1 External Grounding Requirements........................................................25
5.4.2 Connection Procedure.........................................................................25
5.5 AC Cable Connection ...................................................................................26
5.5.1 AC Side Requirements ........................................................................26
5.5.2 Assembling the AC Connector (< 15 kW) ..............................................27
5.5.3 Installing the AC Connector (< 15 kW) ..................................................29
5.5.4 Assembling the AC Connector (≥ 15 kW) ..............................................30
5.5.5 Installing the AC Connector (≥ 15 kW) ..................................................32
5.6 DC Cable Connection ...................................................................................34
5.6.1 PV Input Configuration ........................................................................35
5.6.2 Assembling the PV Connectors ............................................................36
5.6.3 Installing the PV Connectors ................................................................38
5.7 WiNet-S Connection .....................................................................................39
5.7.1 Ethernet Communication .....................................................................39
5.7.2 WLAN Communication ........................................................................41
5.8 WiFi Connection (for Brazil)...........................................................................42
5.9 Meter Connection .........................................................................................43
5.9.1 Assembling the COM Connector ..........................................................43
5.9.2 Installing the COM Connector ..............................................................45
5.10 RS485 Connection......................................................................................46
5.10.1 RS485 Communication System..........................................................46
5.10.2 Assembling the COM Connector ........................................................46
5.10.3 Installing the COM Connector.............................................................49
5.11 DO Connection...........................................................................................50
5.12 DRM Connection ........................................................................................50
5.13 DI Connection ............................................................................................51
5.14 NS Protection Connection ...........................................................................54
6 Commissioning ...............................................................................................55
6.1 Inspection before Commissioning ..................................................................55
6.2 Powering on the System ...............................................................................55
6.3 App Preparation ...........................................................................................56
6.4 Creating a Plant............................................................................................56
6.5 Initializing the Device ....................................................................................59
6.6 Configuring the Plant ....................................................................................63
7 iSolarCloud App ..............................................................................................67
7.1 Brief Introduction ..........................................................................................67

VII
7.2 Installing the App..........................................................................................67
7.3 Account Registration.....................................................................................68
7.4 Login ...........................................................................................................69
7.4.1 Requirements .....................................................................................69
7.4.2 Login Procedure .................................................................................69
7.5 Initial Settings...............................................................................................71
7.6 Function Overview........................................................................................72
7.7 Home ..........................................................................................................73
7.8 Run Information............................................................................................74
7.9 Records.......................................................................................................75
7.10 More..........................................................................................................78
7.10.1 System Parameters...........................................................................79
7.10.2 Operation Parameters .......................................................................79
7.10.3 Power Regulation Parameters............................................................81
7.10.4 Communication Parameters...............................................................85
7.10.5 Firmware Update ..............................................................................86
7.10.6 Auto-test...........................................................................................87
8 System Decommissioning ............................................................................89
8.1 Disconnecting the Inverter.............................................................................89
8.2 Dismantling the Inverter ................................................................................89
8.3 Disposal of the Inverter .................................................................................90
9 Troubleshooting and Maintenance ..............................................................91
9.1 Troubleshooting ...........................................................................................91
9.2 Maintenance ..............................................................................................100
9.2.1 Maintenance Notices.........................................................................100
9.2.2 Routine Maintenance ........................................................................101
9.2.3 Fan Maintenance ..............................................................................102
10 Appendix .....................................................................................................104
10.1 Technical Data..........................................................................................104
10.2 Quality Assurance .................................................................................... 114
10.3 Contact Information .................................................................................. 114

1
1Safety
The device has been designed and tested strictly according to international safety regula-
tions. 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.
• When installing, operating, and maintaining the device, comply with local laws
and regulations. The safety precautions in this manual are only supplements
to local laws and regulations.
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 opera-
tors must wear proper personal protective equipment: helmet, insulated foot-
wear, gloves, etc.
• Before touching the DC cables, operator must use a measuring device to en-
sure that the cable is voltage-free.
• The operator 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 con-
nected 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 10 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.
• Even if the inverter is shut down, it may still be hot and cause burns. Wear pro-
tective gloves before operating the inverter after it cools down.
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 compo-
nent 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 inverter must only be operated with PV strings with class II protection in ac-
cordance with IEC 61730, application class A. It is not allowed for the positive
pole or the negative pole of the PV strings to be grounded. This can cause dam-
age to the inverter.
• Damages to the product due to a faulty or damaged PV installation are not cov-
ered by warranty.
• Any use other than the one described in this document is not permitted.
• During the installation and operation of the inverter, please ensure that the posi-
tive or negative polarities of PV strings do not short-circuit to the ground. Oth-
erwise, an AC or DC short-circuit may occur, resulting in equipment damage.
The damage caused by this is not covered by the warranty.
The intended usage of the inverter is illustrated in the following figure.
figure 2-1 Inverter Application in PV Power System
Item Description Note
APV strings Compatible with monocrystalline silicon, polycrystalline silicon,
and thin-film modules without grounding
B Inverter SG3.0RT, SG4.0RT, SG5.0RT, SG6.0RT, SG7.0RT, SG8.0RT,
SG10RT, SG12RT, SG15RT, SG17RT, SG20RT

5
Item Description Note
CMetering device Meter cupboard with power distribution system
DUtility grid TT, TN-C，TN-S，TN-C-S
The following figure shows the common grid configurations.
2.2 Product Introduction
Model Description
The model description is as follows (take SG10RT as an example):
Appearance
The following figure shows the dimensions of the inverter. The image shown here is for refer-
ence only. The actual product received may differ.
User Manual 2 Product Description

6
figure 2-2 Inverter Appearance
No. Name Description
1Nameplate
To clearly identify the product, including device model, S/N,
important specifications, marks of certification institutions,
etc.
2 LED indicator To indicate the current working state of the inverter.
3Hanger Complement to the included wall-mounting bracket for hang-
ing the inverter.
4 Label Information about COM2 pin definition, supported DRM
modes, etc.
5DC switch
(Optional) To safely disconnect the DC circuit whenever necessary.
6Electrical connec-
tion area
DC terminals (SG20RT for example), AC terminal, additional
grounding terminal and communication terminals.
7 Fans Optimization of the inverter’s heat dissipation. Only the
SG15RT, SG17RT and SG20RT are equipped with fans.
Dimensions
The following figure shows the dimensions of the inverter.
2 Product Description User Manual

7
figure 2-3 Dimensions of the Inverter(in mm)
2.3 Symbols on the Product
Symbol Explanation
Regulatory compliance mark.
TÜV mark of conformity.
CE mark of conformity.
EU/EEA Importer.
UKCA mark of conformity.
Do not dispose of the inverter together with household waste.
The inverter does not have a transformer.
Disconnect the inverter from all the external power sources be-
fore maintenance!
Read the user manual before maintenance!
Burn danger due to the hot surface that may exceed 60℃.
User Manual 2 Product Description

8
Symbol Explanation
Danger to life due to high voltages!
Do not touch live parts for 10 minutes after disconnection from
the power sources.
Only qualified personnel can open and maintain the inverter.
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.
table 2-1 State description of the LED indicator
LED color State Definition
Blue
On The inverter is operating normally.
Flashing The inverter is at standby or startup state (not
feeding power into the grid).
Red
On A system fault has occured.
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.
2 Product Description User Manual

9
figure 2-4 Circuit Diagram (SG5.0RT for example)
• 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 dif-
ferent 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.
2.6 Function Description
Basic Function
• Conversion function
The inverter converts the DC power from the PV array to the AC power, in conformity with
the grid requirements.
• Data storage
The inverter logs running information, error records, etc.
• Parameter configuration
The inverter provides various parameter configurations for optimal operation. Parame-
ters can be set via the iSolarCloud App or the cloud server. For further configurations,
which exceeds the usual parameters configuration, please contact Sungrow.
• Communication interface
The inverter is equipped with two communication interfaces.The communication device
can be connected to the inverter via both interfaces.
After communication connection is established, users can view inverter information, op-
erational data and can set inverter parameters through the iSolarCloud.
It is recommended to use the communication module from SUNGROW. Using
a device from other companies may lead to communication failure or other un-
expected damage.
• Protection Function
User Manual 2 Product Description

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Several protective functions are integrated in the inverter, including short circuit protec-
tion, grounding insulation resistance monitoring, residual current protection, grid monitor-
ing, DC overvoltage/overcurrent protection, etc.
Earth Fault Alarm
The inverter is equipped with a DO relay for the local earth fault alarm. The additional equip-
ment required is a light indicator and/or a buzzer that needs additional power supply.
After the connection, if the earth fault occurs, the DO dry-contact will switch on automatically
to signal the external alarm.
DRM ("AU"/"NZ")
The DRM function is only applicable to a single inverter.
The inverter provides terminals for connecting to a Demand Response Enabling Device
(DRED). After the connection, the DRED asserts demand response modes (DRMs). The in-
verter detects and initiates a response to all supported demand response modes listed in
the following table.
table 2-2 Demand Response Mode Explanation
Mode Explanation
DRM0 The inverter is in the state of shutdown.
Ripple Control
The inverter provides terminals (DRM) for connecting to a Ripple Control Receiver (RCR).
After the connection, the grid dispatching center issues regulation instructions via dry con-
tact (DI). The inverter can control power output according to the local preset instructions.
PID Recovery
• For positive voltage scheme, after the PID function 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 function 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.
2 Product Description User Manual