Sungrow SG3.0RT User manual

SG3.0RT / SG4.0RT / SG5.0RT / SG6.0RT /
SG7.0RT / SG8.0RT / SG10RT / SG12RT /
SG15RT / SG17RT / SG20RT
SG3.0-20RT-UEN-Ver13-202104
WWW.SUNGROWPOWER.COM
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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:
•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.
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.

III
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.
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 ............................................................................................... 8
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............................................................... 13
4.2.2 Carrier Requirements........................................................................ 14
4.2.3 Angle Requirements ......................................................................... 14
4.2.4 Clearance Requirements .................................................................. 15
4.3 Installation Tools......................................................................................... 16
4.4 Moving the Inverter .................................................................................... 17
4.5 Installing the Inverter .................................................................................. 17
5 Electrical Connection ............................................................................... 20
5.1 Safety Instructions...................................................................................... 20
5.2 Terminal Description................................................................................... 20
5.3 Electrical Connection Overview .................................................................. 22
5.4 Additional Grounding Connection ............................................................... 23

VI
5.4.1 Additional Grounding Requirements.................................................. 24
5.4.2 Connection Procedure...................................................................... 24
5.5 AC Cable Connection ................................................................................. 25
5.5.1 AC Side Requirements...................................................................... 25
5.5.2 Assembling the AC Connector (< 15 kW) .......................................... 26
5.5.3 Installing the AC Connector (< 15 kW)............................................... 28
5.5.4 Assembling the AC Connector (≥ 15 kW) ......................................... 29
5.5.5 Installing the AC Connector (≥ 15 kW).............................................. 31
5.6 DC Cable Connection................................................................................. 33
5.6.1 PV Input Configuration...................................................................... 34
5.6.2 Assembling the PV Connectors ......................................................... 35
5.6.3 Installing the PV Connectors ............................................................. 36
5.7 WiNet-S Connection .................................................................................. 38
5.7.1 Ethernet Communication .................................................................. 38
5.7.2 WLAN Communication ..................................................................... 40
5.8 WiFi Connection (for Brazil) ........................................................................ 40
5.9 Meter Connection ...................................................................................... 41
5.9.1 Assembling the COM Connector ....................................................... 41
5.9.2 Installing the COM Connector ........................................................... 43
5.10 RS485 Connection................................................................................... 44
5.10.1 RS485 Communication System ...................................................... 44
5.10.2 Assembling the COM Connector..................................................... 45
5.10.3 Installing the COM Connector ......................................................... 48
5.11 DO Connection......................................................................................... 49
5.12 DRM Connection...................................................................................... 50
5.13 DI Connection .......................................................................................... 50
6 Commissioning ........................................................................................... 54
6.1 Inspection before Commissioning............................................................... 54
6.2 Powering on the System............................................................................. 54
6.3 App Preparation......................................................................................... 55
6.4 Creating a Plant.......................................................................................... 55
6.5 Initializing the Device.................................................................................. 58
6.6 Configuring the Plant.................................................................................. 61
7 iSolarCloud App .......................................................................................... 65
7.1 Brief Introduction........................................................................................ 65
7.2 Installing the App........................................................................................ 65

VII
7.3 Account Registration .................................................................................. 66
7.4 Login.......................................................................................................... 67
7.4.1 Requirements................................................................................... 67
7.4.2 Login Procedure............................................................................... 67
7.5 Initial Settings............................................................................................. 69
7.6 Function Overview ..................................................................................... 69
7.7 Home......................................................................................................... 70
7.8 Run Information ......................................................................................... 71
7.9 Records ..................................................................................................... 72
7.10 More........................................................................................................ 75
7.10.1 System Parameters ........................................................................ 75
7.10.2 Operation Parameters .................................................................... 76
7.10.3 Power Regulation Parameters......................................................... 77
7.10.4 Communication Parameters ........................................................... 82
7.10.5 Firmware Update............................................................................ 82
8 System Decommissioning ...................................................................... 84
8.1 Disconnecting the Inverter.......................................................................... 84
8.2 Dismantling the Inverter.............................................................................. 85
8.3 Disposal of the Inverter............................................................................... 85
9 Troubleshooting and Maintenance ...................................................... 86
9.1 Troubleshooting ......................................................................................... 86
9.2 Maintenance.............................................................................................. 90
9.2.1 Maintenance Notices........................................................................ 90
9.2.2 Routine Maintenance........................................................................ 91
9.2.3 Fan Maintenance ............................................................................. 91
10 Appendix .................................................................................................... 94
10.1 Technical Data ......................................................................................... 94
10.2 Quality Assurance .................................................................................. 104
10.3 Contact Information ............................................................................... 105

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.

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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 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.
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

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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
feeds the AC current to the utility grid.
•The inverter must only be operated with PV strings with class II protection in
accordance 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 damage to the inverter.
•Damages to the product due to a faulty or damaged PV installation are not
covered by warranty.
•Any use other than the one described in this document is not permitted.
The intended usage of the inverter is illustrated in the following figure.
FFiigguurree 22--11 Inverter Application in PV Power System
IItteemm DDeessccrriippttiioonn NNoottee
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
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.

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2.2 Product Introduction
MMooddeell DDeessccrriippttiioonn
The model description is as follows (take SG10RT as an example):
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
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
hanging the inverter.
4 Label Information about CCOOMM22 pin definition, supported DRM
modes, etc.
5 DC switch To safely disconnect the DC circuit whenever necessary.
6Electrical
connection 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.
DDiimmeennssiioonnss
The following figure shows the dimensions of the inverter.
2 Product Description User Manual

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FFiigguurree 22--33 Dimensions of the Inverter(in mm)
2.3 Symbols on the Product
SSyymmbbooll EExxppllaannaattiioonn
Regulatory compliance mark.
TÜV mark of conformity.
CE 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
before maintenance!
Read the user manual before maintenance!
Burn danger due to the hot surface that may exceed 60℃.
User Manual 2 Product Description

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SSyymmbbooll EExxppllaannaattiioonn
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
LLEEDD ccoolloorr SSttaattee DDeeffiinniittiioonn
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

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FFiigguurree 22--44 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
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.
2.6 Function Description
BBaassiicc FFuunnccttiioonn
•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.
Parameters 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,
operational 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 unexpected damage.
User Manual 2 Product Description

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•Protection Function
Several protective functions are integrated in the inverter, including short circuit
protection, grounding insulation resistance monitoring, residual current protection,
grid monitoring, DC overvoltage/overcurrent protection, etc.
EEaarrtthh FFaauulltt AAllaarrmm
The inverter is equipped with a DO relay for the local earth fault alarm. The additional
equipment 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.
DDRRMM ((""AAUU""//""NNZZ""))
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
inverter detects and initiates a response to all supported demand response modes listed
in the following table.
Table 2-2 Demand Response Mode Explanation
MMooddee EExxppllaannaattiioonn
DRM0 The inverter is in the state of standby.
RRiippppllee CCoonnttrrooll
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
contact (DI). The inverter can control power output according to the local preset
instructions.
PPIIDD RReeccoovveerryy
•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