Sungrow SG2K-S User manual

SG2_2.5_3_5K-UEN-Ver14-201805 Version：1.4
User Manual
SG2K-S / SG2K5-S / SG3K-S /
SG3K-D / SG5K-D
PV Grid-Connected
Inverter

I
About This Manual
The manual mainly describes the product information, guidelines for installation,
operation and maintenance. The manual cannot include complete information
about the photovoltaic (PV) system. You can get additional information about
other devices at www.sungrowpower.com or on the webpage of the device
manufacturer.
Applicability
This manual is applicable to the following inverter types:
SG2K-S
SG2K5-S
SG3K-S
SG3K-D
SG5K-D
They will be referred to as “inverter”hereinafter unless otherwise specified.
Target Group
This manual is intended for:
qualified personnel who are responsible for the installation and
commissioning of the inverter; and
inverter owners who will have the ability to interact with the inverter.
How to Use This Manual
Read the manual and other related documents before any work on the inverter
is carried out. Documents must be stored carefully and be available at all times.
All rights to the content of this manual are owned by Sungrow Power Supply
Co., Ltd. (hereinafter “SUNGROW”). No part of this document can be modified,
distributed, reproduced or published in any form or by any means without prior
written permission from SUNGROW.
Contents may be periodically updated or revised due to product development.
The information in this manual is subject to change without notice. The latest
manual can be acquired at www.sungrowpower.com.

II
Symbols
Safety instructions will be highlighted with the following symbols.
Symbol
Explanation
Indicates a hazard with a high level of risk that, if not
avoided, will result in death or serious injury.
Indicates a hazard with a medium level of risk that, if not
avoided, could result in death or serious injury.
Indicates a hazard with a low level of risk that, if not
avoided, could result in minor or moderate injury.
Indicates a situation that, if not avoided, could result in
equipment or property damage.
Indicates additional information, emphasized contents or
tips that may be helpful, e.g. to help you solve problems or
save time.

III
Contents
About This Manual ...................................................................I
1Safety..................................................................................1
1.1 General Safety ..........................................................................1
1.2 Inverter......................................................................................2
1.3 Skills of Qualified Personnel......................................................3
2Product Introduction.........................................................4
2.1 Intended Use.............................................................................4
2.2 Inverter......................................................................................5
2.3 Energy Meter (optional).............................................................7
2.4 Function Description..................................................................8
2.4.1 Basic Function.............................................................................8
2.4.2 External Demand Response.......................................................8
2.4.3 Reactive Power Regulation.........................................................9
2.4.4 Power Quality Response.............................................................9
3Unpacking and Storage...................................................10
3.1 Unpacking and Inspection.......................................................10
3.2 Identifying the Inverter.............................................................10
3.3 Delivery Contents.................................................................... 12
3.4 Storage of Inverter...................................................................13
4Mechanical Mounting......................................................14
4.1 Safety during Mounting ...........................................................14
4.2 Location Requirements ...........................................................14
4.3 Installing the Inverter...............................................................16
4.4 Installing the Energy Meter......................................................18
5Electrical Connection......................................................19
5.1 Terminal Description................................................................20
5.2 Grounding the Inverter ............................................................21
5.3 Grid Connection ......................................................................22

IV
5.3.1 AC Side Requirements..............................................................22
5.3.2 Assembling the AC Connector ..................................................23
5.3.3 Installing the AC Connector.......................................................24
5.4 PV Connection.........................................................................24
5.4.1 PV Input Configuration..............................................................25
5.4.2 Assembling the PV Connector ..................................................26
5.4.3 Installing the PV Connector.......................................................28
5.5 RS485 Connection...................................................................29
5.6 Meter Connection.....................................................................29
5.6.1 On the Meter Side.....................................................................30
5.6.2 On the Inverter Side..................................................................32
5.7 DRM Connection to an External Device...................................33
6Commissioning ............................................................... 35
6.1 Inspection before Commissioning............................................35
6.2 Button Function........................................................................35
6.3 Commissioning Procedure.......................................................36
7LCD Operation................................................................. 37
7.1 Button Function........................................................................37
7.2 Main Screen.............................................................................37
7.3 Menu Structure.........................................................................39
7.4 Viewing Running Info...............................................................39
7.5 Advanced Settings...................................................................40
7.5.1 Inputting the Password..............................................................40
7.5.2 Setting Protective Parameters ..................................................40
7.5.3 Zero-export Setting....................................................................43
7.5.4 PF Setting..................................................................................43
7.5.5 Parameter Reset.......................................................................44
7.5.6 DRM Switch Setting ..................................................................44
7.5.7 GND Detection..........................................................................44
7.5.8 Energy Adjustment....................................................................44
7.5.9 Setting Communication Parameter...........................................44
7.5.10 Ethernet Configuration ............................................................45

V
7.6 Starting/Stopping the Inverter..................................................45
7.7 Viewing the Error Record ........................................................ 45
7.8 Setting the Time ......................................................................45
7.9 Setting the Country.................................................................. 46
7.10 Viewing Device Info.................................................................48
8Troubleshooting and Maintenance ................................49
8.1 Troubleshooting.......................................................................49
8.1.1 For the Indicator Circle..............................................................49
8.1.2 For the Errors on the App or LCD Screen.................................49
8.2 Routine Maintenance ..............................................................55
9System Decommissioning..............................................57
9.1 Disconnecting the Inverter.......................................................57
9.2 Dismantling the Inverter ..........................................................58
9.3 Disposing of the Inverter .........................................................58
10 Appendix..........................................................................59
10.1 Technical Data.........................................................................59
10.1.1 –S Series.................................................................................59
10.1.2 –D Series.................................................................................60
10.2 Exclusion of Liability................................................................62
10.3 About Us .................................................................................63

1
1 Safety
The inverter has been designed and tested strictly according to international
safety regulations. Read all safety instructions carefully prior to any work and
observe them at all times when working on or with the inverter.
Incorrect operation or work may cause:
injury or death to the operator or a third party; or
damage to the inverter and other properties belonging to the operator or a
third party.
All detailed work-related safety warnings and notes will be specified at critical
points in this manual.
1.1 General Safety
PV Panels
Please follow the safety instructions related to the PV strings.
Lethal voltage!
PV strings will produce electrical power when exposed to sunlight and
can cause a lethal voltage and an electric shock.
Only qualified personnel can perform the wiring of the PV panels.
Utility Grid
Please follow the regulations related to the utility grid.
All electrical connections must be in accordance with local and
national standards.
Only with the permission of the utility grid, the inverter can be
connected to the utility grid.

1 Safety User Manual
2
1.2 Inverter
There is a warning label on the inverter body.
Disconnect the inverter from all the external power sources
before service!
Do not touch live parts until 10 minutes after disconnection
from the power sources.
There is a danger from a hot surface that may exceed
60°C.
Danger to life due to high voltages!
Only qualified personnel can open and service the inverter.
Check the user manual before service!
Danger to life from electric shocks due to live voltage
Do not open the enclosure at any time. Loss of any or all the rights may
follow if otherwise.
When the enclosure lid is removed, live components can be touched
which can result in death or serious injury due to electric shock.
Danger to life from electric shock due to damaged inverter
Only operate the inverter when it is technically faultless and in a safe
state.
Operating a damaged inverter can lead to hazardous situations that can
result in death or serious injuries due to electric shock.
Risk of inverter damage or personal injury
Do not pull out the PV connectors and AC connector when the inverter
is running. De-energize the inverter from dual power sources and verify
that there is no voltage.

User Manual 1 Safety
3
All the warning labels and nameplate on the inverter body:
must be clearly visible; and
must not be removed, covered or pasted.
Risk of burns due to hot components!
DO not touch the hot parts (such as heat sink) during operation. Only
the buttons and the optional DC switch can be touched.
Only qualified personnel can perform the country setting.
Unauthorized alteration of the country setting may cause a breach of
the type-certificate marking.
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; and
wear a grounding wristband before touching any connections.
1.3 Skills of Qualified Personnel
Qualified personnel must have the following skills:
training in the installation and commissioning of the electrical system, as well
as the dealing with hazards;
knowledge of the manual and other related documents; and
knowledge of the local regulations and directives.

4
2 Product Introduction
2.1 Intended Use
The inverters, which are single-phase string inverters without transformer, are
the crucial units between the PV strings and the utility grid in a PV power
system.
The inverter is dedicated to converting the DC power generated by the PV
strings into the AC power, which conforms to the parameters of the local utility
grid and is fed into the utility grid.
Any use other than the intended use is not permitted.
The inverter must only be operated with PV strings of protection class
II in accordance with IEC 61730, application class A. It is not permitted
for the positive pole or the negative pole of the PV strings to be
grounded. A permanent destroy to the inverter may follows if
otherwise.
The intended use example is shown in Fig. 2-1.
A B C D
E
Export powerOutput powerPV power
Load power
Fig. 2-1 Application in a PV Power System
Item
Description
Remarks
A
PV strings
Monocrystalline silicon, polycrystalline silicon
and thin-film without grounding.
B
Inverter
SG2K-S, SG2K5-S, SG3K-S, SG3K-D and
SG5K-D.
C
Sungrow single-phase
meter (optional)
Measures the export power and communicate
with the inverter via an RS485 connection.

User Manual 2 Product Introduction
5
Item
Description
Remarks
D
Utility grid
Grid earthing system types: TT, TN.
E
Household load
Devices that consume energy.
For the TT utility grid, the N line voltage to ground must be less than 30
V.
2.2 Inverter
Appearance
234561
7
8
Fig. 2-2 Inverter Appearance (-D series for example)
* The image shown here is for reference only. The actual product you receive
may differ.
Item
Name
Description
1
PV terminals
To connect the PV strings. A pair or two pairs.
2
DC switch (optional)
To disconnect the DC current safely.
3
RS485 terminal
To connect the communication module, such as
Wi-Fi module.
4
Meter | DRM
terminal
Connections to the energy meter and external
Demand Response Enabling Device (DRED).
5
Second PE terminal
For reliable grounding.
6
AC terminal
To feed power into the utility grid.
7
LCD display panel
Human-computer interaction interface, including
a screen, an indicator and two buttons.
8
Mounting rack
To hang the inverter to the wall-mounting
bracket.

2 Product Introduction User Manual
6
Dimensions and Weight
WD
H
Fig. 2-3 Dimensions of the Inverter
Tab. 2-1 Dimensions and Weight
Type
W (mm)
H (mm)
D (mm)
Weight
(kg)
SG2K-S / SG2K5-S /
SG3K-S
300
370
125
8.5
SG3K-D / SG5K-D
360
390
133
11.5
LCD Display Panel
The LCD display panel with a screen, an indicator and two buttons is on the
front of the inverter.
31 2 2
Fig. 2-4 LCD Display Panel
No.
Name
Description
1
LCD
screen
Display the power, state, running information and
parameters.
2
Buttons
ESC / ENT.
User can view or set parameters via the buttons. For detailed
functions, see Tab. 6-1.

User Manual 2 Product Introduction
7
No.
Name
Description
3
Indicator
Green / red / orange.
User can observe the colour and blinking frequency to get
the current state of the inverter. For detailed definition, see
Tab. 6-2.
2.3 Energy Meter (optional)
The SUNGROW Energy Meter is installed next to the main switch to detect the
electrical measured values at the grid-connected point. It communicates with
the inverter via an RS485 connection. The dimensions are shown below.
Front view Side view
18 65
117
35
45.3
Fig. 2-5 single-phase Meter Dimensions (unit: mm)
Back view Side view
72
85
45 27
45
35
Fig. 2-6 Three-phase Meter Dimensions (unit: mm)
The single-phase Energy Meter and the three-phase Energy Meter
are alternative and delivered separately. The meter figures in this
document have been created for the single-phase Energy Meter
unless otherwise specified.
For details about the Energy Meter, please refer to the Quick
Installation Guide for it.

2 Product Introduction User Manual
8
2.4 Function Description
2.4.1 Basic Function
Conversion function
Inverter converts the DC power into the AC power, which conforms to the
grid requirement of its installation country.
Data storage
Inverter archives essential data including running information and error
records.
Parameter configuration
Inverter provides various parameter configurations for optimal operation. You
can set the country via the SolarInfo HomeApp or SolarInfo Bank server, if
you need a more professional setting, please contact Sungrow.
Communication interface
You can choose the RS485 terminal for connecting a communication module
to the PV system, such as Wi-Fi module.
Earth fault alarm
If an earth fault occurs, the error code will be displayed on the LCD screen.
The buzzer inside the inverter will beep to signal an external alarm.
Protective function
The protective functions are integrated in the inverter, including short circuit
protection, grounding insulation resistance surveillance, residual current
protection, anti-islanding protection, DC overvoltage / over-current protection,
etc.
2.4.2 External Demand Response
The inverter provides a RJ45 port for connecting to a demand response
enabling device (DRED). The DRED asserts demand respond modes (DRMs).
The inverter detects and initiates a response to the supported demand
response commands within 2 s. The following table lists the DRMs supported
by the inverter.
Tab. 2-2 Demand Response Modes (DRMs)
Mode
Explanation
DRM0
The inverter is in the state of standby.
DRM5
The export power to the grid is 0.

User Manual 2 Product Introduction
9
Mode
Explanation
DRM6
The export power to the grid is no more than 50% of the rated power.
DRM7
The export power to the grid is no more than 75% of the rated power.
DRM8
The export power to the grid is 100% of the rated power, but subject
to the constraints from other active DRMs.
2.4.3 Reactive Power Regulation
The inverter is capable of operating in reactive power regulation modes for the
purpose of providing support to the grid. These various operating modes can be
enabled or disabled via the LCD menu.
PF: Fixed power factor mode.
Qt: Fixed reactive power mode.
Q(p): The PF of the inverter output varies in response to the output power of
the inverter.
Q(u): The reactive power output of the inverter varies in response to the grid
voltage.
2.4.4 Power Quality Response
The inverter supports two power quality response modes.
Power response for voltage variations
Define the response curve with four reference voltages, which can be set via
the LCD menu. The power output will vary in response to the voltage curve.
Refer to “7.5.2 Setting Protective Parameters”for details.
Power response for frequency variations
The inverter provides built-in over/under frequency protective threshold values.
Refer to “Tab. 7-7 Protective Parameters of Grid Standards”for details.
When the grid frequency is lower than the under-frequency limit or higher than
the over-frequency limit, the inverter will be disconnected from the grid.
When there is an increase in grid frequency which exceeds 50.25 Hz, the
inverter will reduce the power output linearly with an increase of frequency until
the end value (52.00 Hz) is reached.

10
3 Unpacking and Storage
3.1 Unpacking and Inspection
The inverter is thoroughly tested and strictly inspected before delivery. Damage
may still occur during shipping. Conduct a thorough inspection after receiving
the device.
1. Check the packaging for any visible damage.
2. Check the inner contents for damage after unpacking.
3. Check the delivery contents for completeness according to the
packaging list.
Contact SUNGROW or the distributor in case of any damaged or missing
components.
It is the best choice to store the inverter in the original packaging. So, do not
dispose of it.
Fig. 3-1 Single Inverter Packaging
Inverter Type
W (mm)
H (mm)
D (mm)
SG2K-S / SG2K5-S / SG3K-S
545
215
375
SG3K-D / SG5K-D
545
215
445
3.2 Identifying the Inverter
The nameplate clearly identifies the product. It is attached to the side of the
inverter.

User Manual 3 Unpacking and Storage
11
1
2
4
工作温度范围
型号
M o d e l
S / N
序列号
D C - In p u t 直流输入
最大输入电压
Min. MPP Voltage
最小 MPP 电压
Max. MPP Voltage
最大 MPP 电压
Max. Input Current
最大输入电流
Isc PV
最大短路电流
A C -Output
交流输出
额定输出电压
额定输出频率
Rated Output Power
额定输出功率
Max. Output Current
最大输出电流
Max. Apparent Power
最大视在功率
Power Factor Range
功率因数范围
安全等级
过压等级
防护等级
w w w. s u n g r o w p o w e r. c o m
S U N G R O W P O W E R S U P P LY C O ., LT D .
中 国 制 造
M a d e i n C h in a
阳光电源股份有限公司
SG5K-D
D C
D C
D C
D C
I II [A C ] , I I [ D C ]
D C
A**********
Password
密码 ********
600 V
90 V
560 V
20（10/10）A
24（12/12）A
230 V
50 Hz
AC 21.7 A
4.99 kW
4.99 kVA
I
IP65
-25℃…60℃
光伏并网逆变器
G R I D - C O N N E C TE D I N V E R T E R
0.8 Lead...0.8 Lag
Max. Input Voltage
Rated Output Voltage
Rated Output Frequency
Safety Class
Overvoltage Category
Enclosure
Ambient Temperature
P V
Fig. 3-2 Nameplate of Inverter
* The image shown here is for reference only. The actual product you receive
may differ.
Item
Description
Item
Description
1
SUNGROW logo and product
type
3
Marks of certification
institutions
2
Technical data
4
Barcode, company name and
origin
Tab. 3-1 Description of Icons on the Nameplate
Icon
Description
Regulatory compliance mark.
Do not dispose of the inverter together with household waste.
The inverter does not have a transformer.
Refer to the corresponding instructions.
TUV mark of conformity.
CE mark of conformity.

3 Unpacking and Storage User Manual
12
3.3 Delivery Contents
Standard Delivery
Inverter (x1) Wall-mounting bracket
Communication connector
Documentsa
PV connector setb
AC connector set
Wi-Fi module M4x16 screw set
M4x10 screw set (x5)c
Fig. 3-3 Delivery Contents
a) The documents include the Quick User Manual, 1 CD, quality certificates,
packaging list and product test reports.
b) One pair for the –S series and two pairs for the –D series.
c) One M4 x 10 screw set is for external grounding and the other four are for
the communication connector.
Optional Accessory
Single-phase meter Three-phase meter
The single-phase Energy Meter and the three-phase Energy Meter are
alternative. The meter figures in this document have been created for the
single-phase Energy Meter unless otherwise specified.
If you purchase the accessory, they will be delivered separately.