Sungrow SG2KTL-S User manual

SG2_2.5_3_3.6_4_4.6_5KTL-UEN-Ver20-201501 Version：2.0
User Manual
SG2KT
L
-S/SG2K5T
L
-S/SG3KT
L
-S/SG3K6T
L
-S/SG4K
T
L-S/SG3KTL-D/SG3K6TL-D/SG4K6TL-D/SG5KTL-D
PV Grid-Connected Inverter

I
About This Manual
This manual applies to inverter SG2KTL-S, SG2K5TL-S SG3KTL-S, SG3K6TL-S,
SG4KTL-S, SG3KTL-D, SG3K6TL-D, SG4K6TL-D and SG5KTL-D. We hope that the
device will meet your satisfaction when you use it with your PV plant system.
Purpose
The purpose of this manual is to provide detailed product information and
instructions for the use of SG2KTL-S, SG2K5TL-S SG3KTL-S, SG3K6TL-S, SG4KTL-S,
SG3KTL-D, SG3K6TL-D, SG4K6TL-D and SG5KTL-D PV grid-connected inverter.
Related Documents
The manual cannot include complete information about the PV system. You will get
the additional information about other devices at www.sungrowpower.com or via
the webpage of device manufacturer.
Target Group
The manual is aimed at technical personnel who are responsible for inverter
installation and commissioning in the PV power system.
How to Use This Manual
Read this manual and other related documents before any work on the inverter.
Documents must be stored carefully and available at all times.
The contents of the manual will be periodically updated or revised due to the
product development. It is probably that there are changes of manual in the
subsequent inverter edition. The latest manual can be acquired via visiting web
page at www.sungrowpower.com.

II
Symbols Explanation
This manual contains important safety and operational instructions that must be
accurately understood and followed during the installation and maintenance of the
equipment.
To ensure optimum use of this manual, note the following explanations of symbols
used.
DANGER indicates a hazard with a high level of risk which, if not avoided,
will result in death or serious injury.
WARNING indicates a hazard with a medium level of risk which, if not
avoided, could result in death or serious injury.
CAUTION indicates a hazard with a low level of risk which, if not avoided,
could result in minor or moderate injury.
NOTICE indicates a situation which, if not avoided, could result in
equipment or property damage.
NOTE indicates additional information, emphasized contents or tips to
help you solve problems or save time.
Symbols on the Inverter Body
Wait at least 10 minutes after disconnecting the inverter from the
utility grid and the PV input before touching any inner live parts.
Hot surface! Do not touch device hot surface when the device is
running.

III
Read over the user manual before any work on the inverter!
The installation and service of the inverter unit can only be
performed by qualified personnel.

IV
Contents
About This Manual ..........................................................................I
1Safety Instructions...................................................................1
1.1  IMPORTANT SAFETY INSTRUCTIONS ...................................................................1
2Product Introduction ...............................................................6
2.1Intended Usage......................................................................................................6
2.2Product Description..............................................................................................7
2.2.1 Product Appearance ................................................................................................7
2.2.2 Dimensions and Weight of Inverter ...................................................................8
2.2.3 LED Indicator Panel...................................................................................................8
2.3Technical Description...........................................................................................9
2.3.1 Circuit Description ....................................................................................................9
2.3.2 Functions Description ..........................................................................................10
2.3.3 Temperature-related Power Derating............................................................. 11
3Unpacking and Storage .........................................................14
3.1Unpacking and Inspection.............................................................................. 14
3.2Identifying Inverter............................................................................................ 15
3.3Delivery Contents............................................................................................... 16
3.4Storage of Inverter ............................................................................................. 17
4Securing Inverter to the Wall.................................................18
4.1Selecting Installation Location...................................................................... 18
4.2Moving Inverter to Installation Site ............................................................. 21
4.3Installation Procedure....................................................................................... 21
5Electrical Connection.............................................................26
5.1General Safety Instruction............................................................................... 26
5.2Terminals Description ....................................................................................... 27
5.3Overview of Electrical Connection............................................................... 27
5.4Connecting Inverter to AC Grid..................................................................... 28

V
5.4.1 AC Side Requirements .......................................................................................... 28
5.4.2 Assembling AC Cables to Connector .............................................................. 29
5.4.3 AC Wiring Procedure ............................................................................................. 30
5.5Connecting Inverter to PV Arrays.................................................................. 32
5.5.1 PV Inputs Configuration ...................................................................................... 32
5.5.2 Assembling DC Cable to Connector................................................................ 35
5.5.3 DC Wiring Procedure............................................................................................. 37
5.6Grounding of Inverter .......................................................................................38
5.6.1 Second Protective Earth Terminal.................................................................... 39
6Communication......................................................................40
6.1Communication System ................................................................................... 40
6.2Distance between the inverter and the smartphone/router.............. 40
6.2.1 Linear distance ........................................................................................................ 40
6.2.2 Inverter and smartphone / router on different floors .............................. 41
6.2.3 Inverter and smartphone / router on the same floor, in different
rooms .................................................................................................................................... 42
6.3SolarInfo Home APP ........................................................................................... 43
6.3.1 Acquisition and installation................................................................................ 43
6.3.2 SolarInfo Home APP Online Registration ...................................................... 46
6.3.3 Check the running information and connect inverter to your router in
“[Direct visit]”mode.......................................................................................................... 47
6.3.4 Check the running information in “Remote [Login]”mode. ................... 49
7Commissioning ......................................................................50
7.1Verify before Commissioning ......................................................................... 50
7.2Commissioning Procedure .............................................................................. 50
8Disconnecting, Dismantling and Disposing of the Inverter 52
8.1Disconnecting the Inverter .............................................................................52
8.2Dismantling the Inverter..................................................................................53
8.3Disposing of the Inverter .................................................................................53
9Troubleshooting and Maintenance ......................................54
9.1Troubleshooting.................................................................................................. 54
9.1.1 LED Indicator Troubleshooting......................................................................... 54

VI
9.1.2 Troubleshooting of Faults in the smartphone application interface.. 55
9.2Fault Repair........................................................................................................... 59
9.3Routine Maintenance........................................................................................ 59
10FAQ for SolarInfo WiFi Installation and Configuration ........60
10.1FAQ Index Table................................................................................................... 60
10.2Question Description and Solution ............................................................. 60
11Appendix ................................................................................68
11.1Technical Data ..................................................................................................... 68
11.1.1 Single MPPT Inverter Data................................................................................ 68
11.1.2 Double MPPTs Inverter Data............................................................................ 72
11.2Exclusion of Liability.......................................................................................... 76
11.3About Us ................................................................................................................ 77

1
1 Safety Instructions
1.1 IMPORTANT SAFETY INSTRUCTIONS
SG2K5TL-S, SG3KTL-S, SG3K6TL-S, SG4KTL-S, SG4K6TL-D and SG5KTL-D inverter are
designed and tested in accordance with the international safety requirements. But
as with all electrical and electronic equipments, certain precautions should be
observed during installation, operation and maintenance work.
There is a risk of inverter damage or personnel injury!
Various interfaces are provided on the bottom of the inverter. Do not open
the enclosure at any time. Loss of any or all warranty rights may follow if
otherwise.
Operation or work performed incorrectly can result in damage to:
yThe life and well-being of the operator or a third party
yThe inverter and other properties that belong to the operator or a third party
To reduce the risk of injury and ensure the normal operation of the inverter, you
must read over and follow all the instructions, cautions and warnings.
All installation and electrical work must only be performed by qualified
personnel. They have
ybeen trained specially;
yalready completely read through and understood the manual and other
related documents;
ybeen familiar with safety requirements for electrical system.
Technical personnel mentioned above may perform the following work:
ySecure the inverter to the wall
yConnect the inverter to the PV power system
yConnect other devices to the PV power system
yCommission the inverter
yMaintain and service the inverter

1 Safety Instructions User Manual
2
Before Installation
There is a risk of injury if the product is mishandled!
yAlways follow the instructions in the manual when moving and
positioning the inverter.
yThe weight of the equipment can cause injuries, serious wounds, or
bruising if mishandled.
During Installation
Prior to securing the inverter to the wall, it is crucial to make certain that the inverter
is not electrically connected.
System performance can be impaired by poor ventilation!
The equipment requires well ventilation during operation. It is essential to
keep the unit upright and nothing covering the heat sink to let the
equipment interior well cool down.
During Electrical Connection
Lethal voltage exists!
PV arrays will produce electrical energy when exposed to sunlight and thus
can cause an electrical shock hazard.
yWiring of the PV arrays should only be performed by qualified personnel.
All cables must be firmly attached, undamaged, properly insulated and
adequately dimensioned.

User Manual 1 Safety Instructions
3
During Inverter Operation
There is a risk of inverter’s damage or personal injury!
Do not disconnect DC connectors while the inverter is under AC load! First
de-energize the equipment from the dual power sources and then verify
that there is no voltage existing.
There is a risk of burns!
Avoid touching device hot parts (such as the heat sink) during operation.
Only the LED indicator panel and the optional DC switch can be touched
during inverter operation.
Maintenance and Service
yAny malfunction that may impair the inverter safety operation must be
repaired immediately before the inverter is restarted.
yInverter contains no customer serviceable parts inside. Please contact
local authorized personnel if any service work is required.
Servicing of the device in accordance with the manual should never be
undertaken in the absence of proper tools, test equipments or the more
recent revision of the manual which has been clearly and thoroughly
understood.

1 Safety Instructions User Manual
4
There is a risk of inverter damage or personal injury due to incorrect service
work!
Always keep in mind that the inverter is power supplied by dual power
source: PV arrays and utility grid.
Before any service work, observe the following procedures.
yDisconnect the inverter from the utility grid side first and then PV arrays;
yWait at least 10 minutes for inner capacitors to discharge completely;
yVerify that no voltage and current existing with appropriate testing
devices.
Keep non-related persons away!
A temporary warning sign or barrier must be posted to keep non-related
persons away while performing electrical connection and service work.
Do not open the enclosure when the inverter is under voltage. There is a high likely
risk of explosion in very specific cases of malfunction. The enclosure will protect
persons and property from such an explosion, only if it is correctly sealed.
There is a risk of inverter damage if it is improperly serviced.
Use accessories and spare parts approved by the inverter manufacturer
only. Never modify the inverter or other components of the inverter. The
loss of any or all warranty rights may follow if otherwise.
There is a risk of inverter damage due to electrostatic discharge!
The printed circuit boards contain components sensitive to electrostatic
discharge. Wear a grounding wrist band when handling the boards. Avoid
unnecessary touch of the boards during replacement.

User Manual 1 Safety Instructions
5
Others
The selected country settings can be changed by qualified personnel only!
Alternation of the country settings may cause a breach to the
type-certificate marking
All safety instructions, warning labels and nameplate on the inverter body:
ymust be clearly visible;
ymust not be removed, covered or pasted.
These regulations should also be followed:
ythe regulations related to the electricity fed into grid;
ythe safety instructions related to PV arrays;
ythe safety instructions related to other electrical devices.

6
2 Product Introduction
2.1 Intended Usage
SG2K5TL-S, SG3KTL-S, SG3K6TL-S, SG4KTL-S, SG4K6TL-D and SG5KTL-D (They will be
referred to as inverter hereinafter unless otherwise specified), single-phase without
transformer string inverter, is a crucial unit between the PV arrays and the utility grid
in the small-scaled PV power system.
Inverter is dedicated to converting direct current power generated by the PV
modules into alternating current, which conforms to parameters of local utility grid,
and feeds the alternating current into the utility grid. An example about intended
usage of the inverter is shown in Fig. 2-1.
Where the positive or negative terminal of PV strings needs to be grounded,
inverter cannot be connected to PV modules of this type.
A
BC
D
L
N
PE
Fig. 2-1 Application of Inverter to the PV Power System
Item Description Remar
k
A PV strings Monocrystalline silicon; polycrystalline silicon and
thin-film of protection class II without grounding
B Inverter SG2K5TL-S, SG3KTL-S, SG3K6TL-S, SG4KTL-S, SG4K6TL-D
and SG5KTL-D.
C Metering
device Meter cupboard with power distribution system

User Manual 2 Product Introduction
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Item Description Remar
k
D Utility grid TT, TN
For TT utility grid, N line voltage to ground must be less than 30V.
Any other or additional usage other than the intended usage is not
permitted.
Inverter only accepts PV modules of Protection Class II as its input.
Inverter may only be connected to utility grid via distribution board. Local
loads (home appliance, lights, motor loads, etc.) cannot be connected
between the inverter and AC circuit breaker on the distribution board.
2.2 Product Description
2.2.1 Product Appearance
Fig. 2-2 Product Description
Item Name Description
1 LED indicator panel Indicate the working statues of the inverter.
2 DC terminals There is a pair or two pairs of DC terminals
between PV arrays and inverter.
3 DC switch (Optional) Optional component. It is designed for safely
disconnecting DC current.
4 RS485 terminal It is provided for connecting LCD display panel,
WiFi or HEMU module.
5 AC terminal Inverter feeds power to utility grid via this
terminal.

2 Product Introduction User Manual
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Item Name Description
6 Mounting rack It is used to hang inverter onto the backplate.
HEMU module mainly provides the following functions: zero export, LCD
display, partial export, reactive power control and so on.
2.2.2 Dimensions and Weight of Inverter
H
Fig. 2-3 Dimensions of Inverter
Tab. 2-1 Dimensions Value
Type W(mm) H(mm) D(mm) Net weight(kg)
SG2KTL-S/SG2K5TL-S/S
G3KTL-S/SG3K6TL-S/
SG4KTL-S
300 370 125 9
SG3KTL-D/SG3K6TL-D/
SG4K6TL-D/SG5KTL-D 360 390 133 11
2.2.3 LED Indicator Panel
As a human-computer interaction interface, the LED indicator on the inverter front
panel indicates the working statues of the inverter.
Fig. 2-4 LED Indicator Panel
Name Description
LED indicator User can observe the indicator’s flashing color to get the current
state of inverter. Detailed definition is shown in Tab. 2-2.

User Manual 2 Product Introduction
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Tab. 2-2 Description of LED Indicator
State Description
Green&
Red
Flicker once in turn every 1
second
Non-running or Non-fault (For
example, the inverter is in standby
state.)
Green
Flicker once every 0.2 seconds to
2 seconds （The greater the
inverter current power, the
faster the green light flashing）
Inverter is running.
Red Flicker once every 0.3 second A malfunction happens, or protection
function triggers.
The red and green LEDs will be on at the same time when the inverter is
in the upgrade status. If the red and green LEDs are on at the same time
in other status, please contact the service provider for troubleshooting.
2.3 Technical Description
2.3.1 Circuit Description
Fig. 2-6 and Fig. 2-6 show the main circuit of inverter.
The inverter boost circuits raise DC input voltage. The MPP trackers ensure the
maximum power from PV arrays can be utilized. Then the inverter circuit converts
DC power to AC power. Meanwhile inverter is equipped with protective circuit to
guarantee its safety operation which can triggers the AC relay if required.
Additionally, inverter provides WiFi interface for communication.
Fig. 2-5 Main Circuit Diagram of single MPPT inverter

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Fig. 2-6 Main Circuit Diagram of double MPPTs inverter
2.3.2 Functions Description
Inverter functions can be grouped as the following:
yConversion function
Inverter converts the direct current power into the alternating current power,
which conforms to the grid requirement of its installation country.
yData storage and display
Inverter archives essential data including running information and fault records.
yParameters configuration
Inverter provides various parameters configuration for optimal operation. You
can choose the type of country by APP, if you need a more professional setting,
please contact Sungrow.
yCommunication interface
WiFi module for connecting other monitoring devices to the PV system is
included.
yProtection functions include
−short circuit protection
−grounding insulation resistance surveillance
−inverter output voltage surveillance
−inverter output frequency surveillance
−residual current protection
−DC injection of AC output current surveillance
−anti-islanding phenomena protection
−ambient temperature surveillance

User Manual 2 Product Introduction
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−DC over-voltage protection
−over-current protection
−over-temperature protection
2.3.3 Temperature-related Power Derating
The following graph shows the automatic reduction in output power in relation to
ambient temperature.

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