Sungrow SG2K-S User manual

SG2-6K-UEN-Ver14-202003 Version：1.4
User Manual
SG2K-S / SG2K5-S / SG3K-S /
SG3K-D / SG3K6-D / SG4K-D /
SG4K6-D / SG5K-D / SG6K-D
PV Grid-Connected
Inverter

I
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 Power Supply Co., Ltd.
All other trademarks or registered trademarks mentioned in this document 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.
Sungrow Power Supply Co., Ltd.
Address: No.1699 Xiyou Rd., New & High Tech Zone, Hefei, 230088, China.
Email: [e-mail]
Tel: [phone]
Website: www.sungrowpower.com

II
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 respective
component manufacturer.
Validity
This manual is valid for the following inverter models:
SG2K-S
SG2K5-S
SG3K-S
SG3K-D
SG3K6-D
SG4K-D
SG4K6-D
SG5K-D
SG6K-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.
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.

III
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.

IV
Contents
About This Manual....................................................................II
1Safety....................................................................................1
1.1 PV Panels..................................................................................1
1.2 Utility Grid ..................................................................................1
1.3 Inverter.......................................................................................2
1.4 Skills of Qualified Personnel......................................................3
2Product Description............................................................4
2.1 Intended Use .............................................................................4
2.2 Product Introduction...................................................................5
2.2.1 Model Description ..................................................................... 5
2.2.2 Appearance............................................................................... 6
2.2.3 Dimensions ............................................................................... 7
2.2.4 LCD Panel................................................................................. 7
2.3 Function Description..................................................................8
2.3.1 Basic Function........................................................................... 8
2.3.2 Regular Operational Voltage Range.......................................... 9
2.3.3 Regular Operational Frequency Range................................... 10
2.3.4 Active Power Regulation ......................................................... 12
2.3.5 Reactive Power Regulation..................................................... 17
2.3.6 SPI andAuto Test (Italy only) .................................................. 22
3Unpacking and Storage....................................................24
3.1 Unpacking and Inspection........................................................24
3.2 Identifying the Inverter .............................................................24
3.3 Scope of Delivery.....................................................................26
3.4 Inverter Storage.......................................................................27
4Mechanical Mounting........................................................28
4.1 Safety during Mounting............................................................28
4.2 Location Requirements............................................................28

V
4.2.1 Installation Environment Requirements...................................29
4.2.2 Carrier Requirements..............................................................29
4.2.3 Installation Angle Requirements..............................................29
4.2.4 Installation Clearance Requirements.......................................30
4.3 Installation Tools......................................................................30
4.4 Installing the Inverter...............................................................32
5Electrical Connection .......................................................35
5.1 Safety Instructions...................................................................35
5.2 Terminal Description................................................................36
5.3 Additional Grounding Connection............................................37
5.3.1 Additional Grounding Requirements........................................ 37
5.3.2 Connection Procedure.............................................................37
5.4 AC Cable Connection..............................................................38
5.4.1 AC Side Requirements............................................................38
5.4.2 Assembling the AC Connector.................................................39
5.4.3 Installing the AC Connector.....................................................41
5.5 DC Cable Connection..............................................................42
5.5.1 PV Input Configuration ............................................................42
5.5.2 Assembling the PV Connector................................................. 45
5.5.3 Installing the PV Connector.....................................................46
5.6 RS485 Communication Connection ........................................ 47
5.7 Energy Meter Connection........................................................48
6Commissioning .................................................................51
6.1 Inspection before Commissioning ...........................................51
6.2 Button Function.......................................................................51
6.3 Commissioning Procedure ......................................................51
7LCD Operation...................................................................54
7.1 Button Function.......................................................................54
7.2 Main Screen............................................................................54
7.3 Menu Structure........................................................................56
7.4 Viewing Running Info ..............................................................57
7.5 Advanced Settings ..................................................................57

VI
7.5.1 Inputting the Password............................................................ 57
7.5.2 Setting Protective Parameters................................................. 58
7.5.3 Total Export Setting................................................................. 60
7.5.4 Adding Already Installed Inverter Power.................................. 61
7.5.5 Parameter Reset..................................................................... 61
7.5.6 GND Detection........................................................................ 61
7.5.7 Energy Adjustment.................................................................. 62
7.5.8 Setting Communication Parameter.......................................... 62
7.6 Starting/Stopping the Inverter..................................................62
7.7 Viewing the Error Record.........................................................63
7.8 Setting the Time.......................................................................63
7.9 Setting the Country..................................................................63
7.10 Viewing Device Info .................................................................65
7.11 Italian Functions.......................................................................65
7.11.1 Auto Test ............................................................................... 65
7.11.2 SPI Local Control .................................................................. 67
8System Decommissioning ...............................................69
8.1 Disconnecting the Inverter.......................................................69
8.2 Dismantling the Inverter...........................................................70
8.3 Disposing of the Inverter..........................................................70
9Troubleshooting and Maintenance..................................71
9.1 Troubleshooting.......................................................................71
9.1.1 LED Indicator .......................................................................... 71
9.1.2 Errors on the App or LCD Screen............................................ 71
9.2 Maintenance ............................................................................77
10 Appendix............................................................................79
10.1 Technical Data .........................................................................79
10.1.1 –S Series .............................................................................. 79
10.1.2 –D Series .............................................................................. 81
10.2 Quality Assurance....................................................................84
10.3 Contact Information..................................................................85

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 property safety of the operator or a third party.
All detailed work-related safety warnings and notes will be 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, glove, etc.
Before touching the DC cables, operator must use a measuring device to
ensure that the cable is voltage-free.
Must follow all warnings on the PV strings and in its manual.
1.2 Utility Grid
Please follow the regulations related to the utility grid.

1 Safety User Manual
2
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.
1.3 Inverter
Danger to life from electric shocks due to live voltage
Do not open the enclosure at any time. Unauthorized opening will void
guarantee and warranty claims and in most cases terminate the
operating license.
Risk of inverter damage or personal injury
Do not pull out the PV connectors and AC connector when the
inverter is running.
Disconnect the AC circuit breaker and set the DC load-break switch
of the inverter to OFF. Wait at least 10 minutes for the internal
capacitors to discharge.
Ensure that there is no voltage or current before pulling any
connector.
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 heat sinks) during operation. Only
the LCD panel and the DC switch can safely be touched at any time.

User Manual 1 Safety
3
Only qualified personnel can change the country setting.
Unauthorized alteration of the country setting 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; and
wear a grounding wristband before touching any connectors.
Warning Label
Label
Description
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!
* The warning label in English has been pasted before delivery. The labels in
other languages are included in the delivery contents and users may paste the
corresponding label according to specified need.
1.4 Skills of Qualified Personnel
All installations should be performed by qualified personnel. They should have:
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
knowledge of the local regulations and directives

4
2 Product Description
2.1 Intended Use
SG2K-S / SG2K5-S / SG3K-S / SG3K-D / SG3K6-D / SG4K-D / SG4K6-D /
SG5K-D / SG6K-D, a transformerless single-phase PV grid-connected inverter,
is 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.
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. This can cause the inverter to be destroyed.
Damages to the product due to a faulty or damaged PV installation are
not covered by warranty.
The intended use of the inverter is illustrated 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
Note
A
PV strings
Monocrystalline silicon, polycrystalline silicon
and thin-film without grounding.

User Manual 2 Product Description
5
Item
Description
Note
B
Inverter
SG2K-S, SG2K5-S, SG3K-S, SG3K-D,
SG3K6-D, SG4K-D, SG4K6-D, SG5K-D and
SG6K-D.
C
Single-phase or
three-phase energy
meter (optional)
Measures the export power and communicates
with the inverter via an RS485 connection.
D
Utility grid
Grid grounding system types: TT, TN.
E
Household load
Devices that consume energy.
For the TT utility grid, the N line voltage to ground must be 30 V or less.
2.2 Product Introduction
2.2.1 Model Description
The model description is as follows (Take SG3K-S as an example):
SG 3K S
-
S: single MPPT, D: dual MPPTs
Code of power level
Code of PV grid-connected inverter
Tab. 2-1 Power Level Description
Model
Nominal Output Power
Nominal Grid Voltage
SG2K-S
2000 W
230 Vac (single phase)
SG2K5-S
2500 W
SG3K-S
3000 W
SG3K-D
3000 W
SG3K6-D
3680 W
SG4K-D
4000 W
SG4K6-D
4600 W
SG5K-D
4990 W
SG6K-D
6000 W

2 Product Description User Manual
6
2.2.2 Appearance
234671
8
9
5
Fig. 2-2 Inverter Appearance (-D series for reference)
* The image shown here is for reference only. The actual product you receive
may differ.
Item
Name
Description
1
PV terminals
Positive and negative DC input connectors.
One or two pairs, depending on inverter model.
2
DC switch
To disconnect the DC current safely.
3
Com. terminal
Can be connected to Wi-Fi or E-Net
communication module.
4
DRM terminal
Reserved.
5
Meter terminal
For Energy Meter.
6
Additional grounding
terminal
For reliable grounding.
7
AC terminal
To feed power into the utility grid.
8
LCD panel
The display and two buttons can be used to
access current operating data or change inverter
settings.
9
Mounting rack
For mounting the inverter to the wall mounting
bracket.

User Manual 2 Product Description
7
2.2.3 Dimensions
W
H
D
Fig. 2-3 Dimensions of the Inverter
Tab. 2-2 Dimensions and Weight
Model
W (mm)
H (mm)
D (mm)
SG2K-S / SG2K5-S / SG3K-S
300
370
125
SG3K-D / SG3K6-D / SG4K-D /
SG4K6-D / SG5K-D / SG6K-D
360
390
133
2.2.4 LCD Panel
The LCD panel with a screen, an indicator and two buttons is on the front of the
inverter.
31 2 2
Fig. 2-4 LCD Panel
No.
Name
Description
1
LCD screen
Display and access current operating data or change
inverter settings.
2
Buttons
/ ENT.
View or set parameters via the buttons. For detailed
functions, see Tab. 6-1.

2 Product Description User Manual
8
No.
Name
Description
3
Indicator
Green / red. User can observe the color and blinking
frequency to get the current state of the inverter. For
detailed definition, see Tab. 6-2.
2.3 Function Description
2.3.1 Basic Function
Conversion function
The inverter converts DC power from the PV array into grid-compliantAC
power and feeds it into the utility grid.
Data storage
Inverter logs essential data including running information and error records.
Parameter configuration
Inverter provides various parameter configurations for optimal operation. You
can view the parameters via iSolarHome App and set the parameters via
iSolarCloudApp or iSolarCloud server (qualified personnel only). In case you
require further settings, please contact SUNGROW.
RS485 communication
The RS485 communication terminal is provided to which communication
module can be connected, thereby achieving the communication function
and connecting the monitoring device to the whole PV system.
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.
Further information on the communication module can be found in
the respective Quick Installation Guide.
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.
Protection 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.

User Manual 2 Product Description
9
2.3.2 Regular Operational Voltage Range
The inverters can operate within the allowable voltage range for at least the
specified observation time. The setting of the conditions depends on whether
the connection is due to a normal operational start-up or an automatic
reconnection after tripping of the interface protection.
When the voltage level is out of the operational levels, the inverter will
disconnect from the grid in the protection time. If a disturbance lasts less than
the required protection time, the inverter can reconnect to the grid if the voltage
level goes back to normal levels after the disturbance.
Grid voltage, V
V1 V2VmaxVmin Vn
Normal operation
Start-up
Standby Standby
V3 V4Vn
Reconnection
Standby Standby
Grid voltage, V
Condition 1: initial start-up Condition 2: reconnection after protection
VmaxVmin
Normal operation
Fig. 2-5 InverterAction related to Grid Voltage (“DE”for example)
Tab. 2-3 Operational Voltage Parameter Description
Parameter
Explanation
Grid-connection
V1
The lower voltage limit for initial start-up.
V2
The upper voltage limit for initial start-up.
V3
The lower voltage limit for reconnection.
V4
The upper voltage limit for reconnection.
tv
Minimum observation time.
kv
Connection or recovery gradient.
Protection
Vmin
Under-voltage protection value.
Vmax
Over-voltage protection value.
Tmin
Under-voltage protection time.
Tmax
Over-voltage protection time.
Tab. 2-4 Default Values of Operational Voltage Parameter
Parameter
DE
BE
LUX
NL,
EU, PL
IT
V1 (V)
195.5
195.5
195.5
195.5
195.5
V2 (V)
251.0
251.0
251.0
253.0
253.0
V3 (V)
195.5
195.5
195.5
197.5
195.5
V4 (V)
251.0
251.0
251.0
253.0
253.0
tv (s)
60
60
60
60
30 or 300 (3)

2 Product Description User Manual
10
Parameter
DE
BE
LUX
NL,
EU, PL
IT
kv
25% Pn/min or
10% Pn/min (1)
Disabled or 10% Pn/min (2)
20% Pn/min
Vmin (V)
184.0 for stage I
103.5 for stage
II
184.0
184.0
Tab.
2-5
195.5 for
stage I
34.5 for
stage II
Vmax (V)
287.5
264.5
264.5
264.5
Tmin (s)
3.0 for stage I
0.3 for stage II
0.2
1.35
1.5 for stage
I
0.2 for stage
II
Tmax (s)
0.1
0.2
0.15
0.2
(1) 25% Pn/min for initial connection and 10% Pn/min for reconnection.
(2) Disabled for initial connection and 10% Pn/min for reconnection.
(3) 30 s for initial connection and 300 s for reconnection.
Tab. 2-5 Multi-stage Voltage Protection Values for NL, EU, PL
Parameter
NL, EU, PL
Vmin (V)
195,5 for stage I, 115,0 for stage II
Vmax (V)
276,0 for stage I, 287,5 for stage II
Tmin (s)
10,0 for stage I, 0,1 for stage II
Tmax (s)
10,0 for stage I, 0,1 for stage II
Tab. 2-6 Default Values of Operational Voltage Parameters for FR
Parameter
FR1
FR2
FR3
V1 (V)
195.5
195.5
195.5
V2 (V)
251.0
251.0
251.0
V3 (V)
195.5
195.5
195.5
V4 (V)
251.0
251.0
251.0
tv (s)
60
60
60
kv
Disabled for initial connection and 10% Pn/min for reconnection.
Vmin (V)
184.0
184.0
195.5
Vmax (V)
264.5
255.3
264.5
Tmin (s)
0.2
0.2
0.2
Tmax (s)
0.2
0.2
0.2
Hereinafter, FR1, FR2 and FR3 stand for grids of France homeland
50 Hz, France overseas 50 Hz and France overseas 60 Hz
respectively. FR stands for all France region.
2.3.3 Regular Operational Frequency Range
The inverter can operate within the frequency allowable range for at least the

User Manual 2 Product Description
11
specified observation time. The setting of conditions depends on whether the
connection is due to a normal operational start-up or an automatic reconnection
after tripping of the interface protection.
When the frequency level is out of the operational levels, the inverter will
disconnect from the grid. If a disturbance lasts less than the required protection
time, the inverter can reconnect to the grid if the frequency level goes back to
normal levels after the disturbance.
For Countries except “IT”
Grid frequency, Hz
F1 F2 FmaxFmin Fn
Normal operation
Start-up
Standby Standby
F3 F4Fn
Reconnection
Standby Standby
Grid frequency, Hz
Condition 1: initial start-up Condition 2: reconnection after protection
FmaxFmin
Normal operation
Fig. 2-6 Inverter Action related to Grid Frequency (“DE”for example)
Tab. 2-7 Operational Frequency Parameter Description
Parameter
Description
Grid-connection
F1
The lower frequency limit for initial start-up.
F2
The upper frequency limit for initial start-up.
F3
The lower frequency limit for reconnection.
F4
The upper frequency limit for reconnection.
tf
Minimum observation time.
kf
Connection gradient.
Protection
Fmin
Under-frequency protection value.
Fmax
Over-frequency protection value.
Tmin
Under-frequency protection time.
Tmax
Over-frequency protection time.
Tab. 2-8 Default Values of Operational Frequency Parameter
Parameter
DE
FR1
FR2
FR3
BE
LUX
NL,
EU,
PL
F1 (Hz)
47.52
47.52
47.52
59.90
47.52
47.52
49.50
F2 (Hz)
50.10
50.10
50.10
60.10
50.10
50.10
50.10
F3 (Hz)
47.52
47.52
47.52
59.90
47.52
47.52
49.50
F4 (Hz)
50.10
50.05
50.05
60.10
50.05
50.05
50.05
tf (s)
60
60
60
60
60
60
60

2 Product Description User Manual
12
Parameter
DE
FR1
FR2
FR3
BE
LUX
NL,
EU,
PL
kf
25% Pn/min or
10% Pn/min *
Disabled for initial connection and 10% Pn/min for
reconnection
Fmin (Hz)
47.50
47.50
46.00
55.00
47.50
47.50
Tab.
2-9
Fmax (Hz)
51.50
50.60
52.00
62.50
51.50
52.00
Tmin (s)
0.1
0.2
0.2
0.2
0.4
0.3
Tmax (s)
0.1
0.2
0.2
0.2
0.4
0.3
* 25% Pn/min for initial connection and 10% Pn/min for reconnection.
Tab. 2-9 Multi-stage Frequency Protection Values for NL, EU, PL
Parametro
NL, EU
Fmin (Hz)
47,50 for stage I, 47,00 for stage II
Fmax (Hz)
51,50 for stage I, 52,00 for stage II
Tmin (s)
2,0 for stage I, 0,1 for stage II
Tmax (s)
2,0 for stage I, 0,1 for stage II
For Country “IT”
The inverter can be connected to grid and start to generate electrical power
when the grid frequency is between 49.90 Hz and 50.10 Hz.
For a normal operational start-up, the observation time is 30 s and the
gradient is 20% Pn/min.
For an automatic reconnection after tripping of the interface protection, the
observation time is 300 s and the gradient is 20% Pn/min.
For Italy, the over- / under- frequency protection value and time can be
controlled by the SPI function, through LCD setting or remote command via
RS485 communication. Please refer to “2.3.6 SPI and Auto Test (Italy only)”
for details.
2.3.4 Active Power Regulation
Over-voltage Response
When the grid voltage is higher than (110 % Vmax - 5) V, the inverter will reduce
the active power export to grid according to the following equation:
△ P= Pnom x R
Where:
− △ Pis the variation of active power export to grid (in %) related to the
nominal power.
−Pnom is the nominal grid power.
−Ris the desired reduction in active export power (expressed in % of Volt),