Sungrow SG30 33 40 50CX User manual

SG30_33_40_
50CXPV Grid-Connected
InverterUser ManualSG30_33_40_
50CX UEN-Ver19-202111
PV Grid-Connected Inverter
User Manual
SG30_33_40_50CX
SG30_33_40_50CX UEN-Ver19-202111

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:
• SG30CX
• SG33CX
• SG40CX
• SG50CX
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.
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.

III
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 .................................................................................................7
2.5 DC Switch......................................................................................................8
2.6 Circuit Diagram ..............................................................................................9
2.7 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...........................................................................................17
4.4 Moving the Inverter.......................................................................................18
4.4.1 Manual Transport................................................................................19
4.4.2 Hoisting Transport...............................................................................19
4.5 Installing the mounting-bracket ......................................................................21
4.5.1 PV Bracket-Mounted Installation ..........................................................21
4.5.2 Wall-Mounted Installation.....................................................................22

VI
4.6 Installing the Inverter.....................................................................................23
5 Electrical Connection .....................................................................................25
5.1 Safety Instructions........................................................................................25
5.2 Terminal Description .....................................................................................25
5.3 Electrical Connection Overview .....................................................................26
5.4 Crimp OT/DT terminal...................................................................................28
5.5 External Grounding Connection .....................................................................29
5.5.1 External Grounding Requirements........................................................29
5.5.2 Connection Procedure.........................................................................30
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 ...................................................................................35
5.7.1 PV Input Configuration ........................................................................36
5.7.2 Assembling the PV Connectors ............................................................36
5.7.3 Installing the PV Connector..................................................................38
5.8 Communication Junction Box ........................................................................39
5.9 Communication Wiring Board ........................................................................40
5.10 RS485 Connection......................................................................................40
5.10.1 Interface Description .........................................................................40
5.10.2 RS485 Communication System..........................................................41
5.10.3 Connection Procedure(Terminal Block) ...............................................43
5.10.4 Connection Procedure (RJ45 Ethernet Port)........................................44
5.11 Dry Contact Connection ..............................................................................46
5.11.1 Dry Contact Function .........................................................................46
5.11.2 Wiring Procedure...............................................................................48
5.12 DRM Connection（For Countries “AU” and “NZ”）........................................48
5.12.1 DRM Function...................................................................................48
5.12.2 Connection Procedure.......................................................................49
5.13 Communication Module Connection (optional) ..............................................51
6 Commissioning ...............................................................................................52
6.1 Inspection before Commissioning ..................................................................52
6.2 Commissioning Procedure ............................................................................52
7 iSolarCloud App ..............................................................................................53
7.1 Brief Introduction ..........................................................................................53

VII
7.2 Installing the App..........................................................................................53
7.3 Function Overview........................................................................................54
7.4 Login ...........................................................................................................54
7.4.1 Requirements .....................................................................................54
7.4.2 Login Procedure .................................................................................54
7.5 Home page ..................................................................................................58
7.6 Run Information............................................................................................60
7.7 Records.......................................................................................................62
7.8 More............................................................................................................64
7.8.1 System Parameters.............................................................................64
7.8.2 Operation Parameters .........................................................................65
7.8.3 Power Regulation Parameters..............................................................67
7.8.4 Communication Parameters.................................................................72
7.8.5 Firmware Update ................................................................................73
7.8.6 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 ................................................................................................86
9.2.1 Maintenance Notices...........................................................................86
9.2.2 Routine Maintenance ..........................................................................87
9.2.3 Cleaning Air Inlet and Outlet.................................................................87
9.2.4 Fan Maintenance ................................................................................88
10 Appendix .......................................................................................................90
10.1 Technical Data............................................................................................90
10.2 Wring Distance of DI Dry Contact.................................................................94
10.3 Quality Assurance ......................................................................................96
10.4 Contact Information ....................................................................................96

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 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 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 to feed the AC current
into the utility grid.
The intended usage of the inverter is illustrated in the following figure.
figure 2-1 Inverter Application in PV Power System
The inverter must not be connected to a PV string that requires positive or negative
grounding.
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.
Do not connect any local load between the inverter and the AC circuit breaker.
Any use other than the one described in this document is not permitted.
Item Description Note
APV strings Monocrystalline silicon, polycrystalline silicon and thin-film
without grounding.
B Inverter SG30CX, SG33CX, SG40CX, SG50CX, SG30CX-20,
SG33CX-20, SG40CX-20, SG50CX-20.
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 me-
dium voltage.
EUtility grid TN-C, TN-S, TN-C-S, TT, IT.
The following figure shows the common grid configurations.

5
2.2 Product Introduction
Model Description
The model description is as follows(Take SG30CX 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
1LED indicator To indicate the current working state of the inverter.
2Mounting ears To hang the inverter onto the mounting-bracket.
3Side handles To move the inverter.
4Labels Warning symbols, nameplate, and QR code.
5Additional ground-
ing terminals Use to ground the inverter.
6Bottom handles To move the inverter.
7DC switches To disconnect the DC current safely.
8 Wiring area DC switches, AC terminals,DC terminals, and communica-
tion terminals. For details, refer to"5.2 Terminal Description"
Dimensions
The following figure shows the dimensions of the inverter.
figure 2-3 Dimensions of the Inverter(in mm)
*The image shown here is for reference only. The actual product you receive may differ.
2 Product Description User Manual

7
Type Dimensions (W*H*D) Weight
SG30CX/
SG30CX-20 702×595×310mm 50 kg
SG33CX/
SG33CX-20
2.3 Symbols on the Product
Symbol Explanation
Do not dispose of the inverter together with household waste.
TÜV mark of conformity.
CE mark of conformity.
Regulatory compliance mark.
The inverter does not have a transformer.
CGC-SOLAR 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!
* 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
LED color 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 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 connection is established, data commu-
nication in process, and a system fault occurs.
Gray
OFF Both the AC and DC sides are powered down.
2.5 DC Switch
The DC switch is used to disconnect the DC current safely whenever necessary.
The SG30CX and SG33CX is equipped with one DC switch to control the connection and
disconnection of all DC terminals.
The SG40CX and SG50CX are equipped with two DC switches separately controlling a
group of DC inputs. The correspondence is as follows:
* The image shown here is for reference only. The actual product received may differ.
2 Product Description User Manual

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Turn the DC switches to the ON position before restarting the inverter.
2.6 Circuit Diagram
The following figure shows the main circuit of the inverter.
figure 2-4 Circuit Diagram
• 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.
2.7 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 cur-
rent into the grid.
Data Storage
The inverter logs running information, error records, etc.
Parameter Configuration
The inverter provides various settable parameters. Users can set parameters via the App to
meet the requirements and optimize the performance.
Communication Interface
The inverter is designed with standard RS485 communication interfaces and communication
accessory port.
The standard RS485 communication interfaces are used to establish communication con-
nection with monitoring devices and upload monitoring data by using communication cables.
The communication accessory port is used to connect communication module manufactured
by SUNGROW, 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 in-
verter parameters through the iSolarCloud.
User Manual 2 Product Description

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It is recommended to use the communication module from SUNGROW. Using a
device from other companies may lead to communication failure or other unex-
pected damage.
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 protec-
tion, DC overvoltage/overcurrent protection, etc.
PID recovery
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 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.
• PID recovery function and Q at night cannot be enabled at the same time.
• 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 ex-
pected or even damage the PV 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.
2 Product Description User Manual