Sungrow SG2K-S User manual

SG2_3_4_5_6_8.3K-UEN-Ver14 Version：1.4
User Manual
SG2K-S / SG3K-S / SG3K-D /
SG4K-D / SG5K-D / SG6K-D /
SG8K3-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 respective
component manufacturer.
Applicability
This manual is applicable to the following inverter types:
SG2K-S
SG3K-S
SG3K-D
SG4K-D
SG5K-D
SG6K-D
SG8K3-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.

II
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.
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)............................................................8
2.4 Function Description..................................................................9
2.4.1 Basic Function...........................................................................9
2.4.2 Reactive Power Regulation.....................................................10
2.4.3 Regular Operational Voltage Range........................................ 11
2.4.4 Regular Operational Frequency Range...................................12
3Unpacking and Storage....................................................15
3.1 Unpacking and Inspection.......................................................15
3.2 Identifying the Inverter.............................................................16
3.3 Delivery Contents....................................................................17
3.4 Storage of Inverter...................................................................18
4Mechanical Mounting........................................................19
4.1 Safety during Mounting ...........................................................19
4.2 Location Requirements ...........................................................19
4.3 Tools........................................................................................21
4.4 Installing the Inverter...............................................................23
4.5 Installing the Energy Meter......................................................25
5Electrical Connection .......................................................26
5.1 Terminal Description................................................................27
5.2 Grounding the Inverter ............................................................28

IV
5.3 Grid Connection.......................................................................29
5.3.1 AC Side Requirements............................................................ 29
5.3.2 Assembling the AC Connector................................................. 30
5.3.3 Installing the AC Connector..................................................... 31
5.4 PV Connection.........................................................................32
5.4.1 PV Input Configuration............................................................ 32
5.4.2 Assembling the PV Connector................................................. 35
5.4.3 Installing the PV Connector..................................................... 36
5.5 RS485 Communication Connection.........................................37
5.6 (Optional) Meter Communication Connection..........................38
5.6.1 On the Meter Side................................................................... 38
5.6.2 On the Inverter Side................................................................ 40
6Commissioning .................................................................42
6.1 Inspection before Commissioning............................................42
6.2 Button Function........................................................................42
6.3 Commissioning Procedure.......................................................43
7LCD Operation...................................................................44
7.1 Button Function........................................................................44
7.2 Main Screen.............................................................................44
7.3 Menu Structure........................................................................46
7.4 Viewing Running Info...............................................................47
7.5 Advanced Settings...................................................................47
7.5.1 Inputting the Password............................................................ 47
7.5.2 Setting Protective Parameters................................................. 48
7.5.3 Zero-export Setting ................................................................. 50
7.5.4 Adding the Existing Inverter..................................................... 51
7.5.5 PF Setting ............................................................................... 51
7.5.6 Parameter Reset..................................................................... 51
7.5.7 Energy Adjustment.................................................................. 51
7.5.8 Setting Communication Parameter.......................................... 52
7.5.9 Ethernet Configuration ............................................................ 52
7.6 Starting/Stopping the Inverter..................................................52

V
7.7 Viewing the Error Record........................................................53
7.8 Setting the Time ......................................................................53
7.9 Setting the Country..................................................................53
7.10 Viewing Device Info.................................................................54
8Troubleshooting and Maintenance..................................55
8.1 Troubleshooting.......................................................................55
8.1.1 LED Indicator ..........................................................................55
8.1.2 Errors on the App or LCD Screen............................................55
8.2 Routine Maintenance ..............................................................61
9System Decommissioning ...............................................63
9.1 Disconnecting the Inverter.......................................................63
9.2 Dismantling the Inverter ..........................................................64
9.3 Disposing of the Inverter .........................................................64
10 Appendix............................................................................65
10.1 Technical Data.........................................................................65
10.1.1 –S Series...............................................................................65
10.1.2 –D Series ..............................................................................66
10.2 Quality Assurance ...................................................................71

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 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.
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. Unauthorized opening will void
guarantee and warranty claims and in most cases terminate the operating
license.
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.
All the warning labels and nameplate on the inverter body:
must be clearly visible; and

User Manual 1 Safety
3

must not be removed, covered or pasted.
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 o
f the inverter to OFF. Wait 10 minutes for the internal
capacitors to discharge. Verify that there is no voltage or current
before pulling any connector.
Risk of burns due to hot components!
DO not touch any hot parts (such as heat sink) during operation. Only
the LCD panel and the DC switch can safely be touched at any time.
Only qualified personnel can perform 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.
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 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 converts DC power from the PV array into grid-compliant AC power
and feeds it 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. This can cause the inverter to be destroyed.
Damages to the product due to a faulty or damaged DC installation are
not covered by warranty.
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, SG3K-S, SG3K-D, SG4K-D,
SG5K-D, SG6K-D and SG8K3-D.

User Manual 2 Product Introduction
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Item
Description
Remarks
C
Sungrow single-phase
or three-phase meter
(optional)
Measures the export power and communicates
with the inverter via an RS485 connection.
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 30 V or less.
2.2 Inverter
Type Description
The type 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
Appearance
The image shown here is for reference only. The actual product you receive
may differ.
Type
Nominal Output Power
Nominal Grid Voltage
SG2K-S
2000 W
220 Vac / 230 Vac / 240 Vac
(single phase)
SG3K-S 3000 W
SG3K-D 3000 W
SG4K-D 4000 W
SG5K-D 5000 W
SG6K-D 6000 W
SG8K3-D 8300 W

2 Product Introduction User Manual
6
234561
7
8
Fig. 2-2 Inverter Appearance (SG5K-D for reference)
Item
Name
Description
1 PV terminals
Positive and negative DC input connectors.
One or two or three pairs, depending on inverter type.
2
DC switch
To disconnect the DC current safely.
3
RS485
terminal
Can be connected to Wi-Fi communication module.
4
Meter | DRM
terminal
Left connector is intended for energy meter, right
connector is reserved.
5
Second PE
terminal
For reliable grounding.
6
AC terminal
To feed power into the utility grid.
7 LCD panel
The display and two buttons can be used to access
current operating data or change inverter settings.
8
Mounting rack
For mounting the inverter to the wall mounting bracket.

User Manual 2 Product Introduction
7
Dimensions and Weight
WD
H
Fig. 2-3 Dimensions of the Inverter
Tab. 2-2 Dimensions and Weight
Type
W (mm)
H (mm)
D (mm)
Weight (kg)
SG2K-S / SG3K-S
300
370
125
8.5
SG3K-D / SG4K-D /
SG5K-D / SG6K-D
360 390 133 11.5
SG8K3-D
360
390
148
15.5
LCD Panel
The LCD panel with a screen, an indicator and two buttons is on the front of the
inverter.
3
1 2 2
Fig. 2-4 LCD Display Panel
No.
Name
Description
1
LCD
screen
Display and access current operating data or change inverter
settings.
2
Buttons
ESC / ENT.
View or set parameters
via the buttons. For detailed
functions, see Tab. 6-1.

2 Product Introduction User Manual
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No.
Name
Description
3
Indicator
Green / red.
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)

User Manual 2 Product Introduction
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The single-phase Energy Meter and the three-phase Energy Meter
are optional
and delivered separately. The meter figures in this
document have been created for the single-phase Energy Meter
unless otherwise specified.
More detailed information on the Energy Meter can be found in the
respective Quick Installation Guide.
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 App or the cloud 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 a Wi-Fi module. Refer to the quick guide for the
Wi-Fi module for details.
It is recommended to use the communication module from
Sungrow. U
sing 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.
Protective function
The protective functions are integrated in the inverter, including short circuit
protection, grounding insulation resistance surveillance, residual current

2 Product Introduction User Manual
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protection, anti-islanding protection, DC overvoltage / over-current protection,
etc.
2.4.2 Reactive Power Regulation
The inverters are capable of operating in the following power factor range. Any
operational point, as a result of the following definitions/curves, will be reached
at maximum in 10 seconds.
PF Mode
The power factor is equal to 1, adjusted in factory, with tolerance to work from
0.98 leading (inductive) to 0.98 lagging (capacitive).
The power factor can be set via the LCD menu. For details, see “7.5.5 PF
Setting”.
Q(p) Mode
The Q(p) mode is not applicable to SG2K-S. This mode is disabled by default.
You can enable this function via the cloud server www.isolarcloud.com.hk. Then,
after any change in active power, the inverter is able to adjust the reactive
power automatically according to the following power factor curve.
PF
20% 75%
50%
Lagging
1.0
Leading
0.90
0.90
100%
AB
C
P/P
norminal
Fig. 2-7 Power Factor Curve
The power factor curve can only be enabled when the grid voltage surpass
the activation voltage, adjustable value between 100 % and 110 % of
nominal voltage level, with pre-defined value at factory of 104 % of nominal
voltage.

User Manual 2 Product Introduction
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The power factor curve can only be disabled when the voltage goes back to
a value below the shutdown voltage level, adjustable value between 90 %
and 100 % of nominal voltage level, with default voltage level at 100 %
adjusted at factory.
2.4.3 Regular Operational Voltage Range
For Country Brazil (Code “BRA”)
The inverters can operate within the voltage limits defined in the following table.
Tab. 2-3 Disconnection related to Voltage
Voltage Level at Grid-connected
Point (% related to Local Nominal
Voltage)
Maximum Time to Disconnect (1)
V < 80 %
0.4 s
80 % <= V <= 110 %
Normal operation (2)
V > 110 %
0.2 s
When the voltage level is out of the operational levels shown in the table, the
inverter will disconnect from the grid.
If a disturbance lasts less than the required disconnection time, the inverter can
reconnect to the grid if the voltage level goes back to normal levels after the
disturbance.
Remarks:
(1) The maximum time to disconnect refers to the interval between the
abnormal voltage level and the action of inverter (disconnect from the grid).
(2) When the grid voltage is higher than (110 % Vnominal - 5) V, the inverter will
reduce the active power export to grid according to the following equation:
△ P= Pnominal x R
Where:
− △ Pis the variation of active power export to grid (in %) related to the nominal
power.
−Pnominal is the nominal grid power.
−Ris the desired reduction in active export power (expressed in % of Volt),
adjusted in -20 % per Volt.
For Country Mexico (Code “MX”)
The inverters can operate within the voltage limits defined in the following table.

2 Product Introduction User Manual
12
Tab. 2-4 Disconnection related to Voltage
Voltage Level at Grid-connected
Point (% related to Local Nominal
Voltage)
Maximum Time to Disconnect (1)
V < 95 %
0.16 s (2)
95 % <= V <= 105 %
Normal operation
V > 105 %
0.16 s (2)
When the voltage level is out of the operational levels shown in the table, the
inverter will disconnect from the grid.
If a disturbance lasts less than the required disconnection time, the inverter can
reconnect to the grid if the voltage level goes back to normal levels after the
disturbance.
Remarks:
(1) The maximum time to disconnect refers to the interval between the
abnormal voltage level and the action of inverter (disconnect from the grid).
(2) After the low / high voltage, the inverter will only reconnect to the grid again
when the grid voltage returns to normal operation range, respecting the
reconnection waiting time of 300 seconds.
2.4.4 Regular Operational Frequency Range
For Country Brazil (Code “BRA”)
Nominal frequency of Brazilian grid is 60 Hz.
The inverters can operate within the frequency limits defined in the following
table.
Tab. 2-5 Disconnection related to Frequency
Grid Frequency Level Maximum Time to Disconnect (1)
f < 57.5 Hz
0.2 s
57.5 Hz <= f <= 62 Hz
Normal operation (2)
f > 62 Hz
0.2 s (3)
When the frequency level is out of the operational levels shown in the table, the
inverter will disconnect from the grid.
Remarks:
(1) The maximum time to disconnect refers to the interval between the
abnormal frequency level and the action of inverter (disconnect from the
grid).
(2) After the low frequency, the inverter will only reconnect to the grid again
when the frequency returns to 59.9 Hz, respecting the reconnection waiting
time of 300 seconds. When the grid frequency is more than 60.5 Hz and less