Sungrow SG3KTL-EC User manual

SG3_4_5_6KTL-EC-UEN-Ver15-201508 Version：1.5
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User Manual
SG3KTL-EC / SG4KTL-EC/
SG5KTL-EC / SG6KTL-EC
PV Grid-Connected Inverter

I
About This Manual
This manual is for the inverters SG3KTL-EC, SG4KTL-EC, SG5KTL-EC, and SG6KTL-EC
(hereinafter referred to as inverter unless specified otherwise). They are
grid-connected, transformer-less, robust inverters with high conversion efficiency.
The devices will bring you profit for PV power system.
Aim
The manual contains information about the inverter, which will provide you
guidelines to connect the inverter into the PV power system and to operate the
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 targeted to technical personnel who is responsible for inverter
installation and commissioning in the PV power system and inverter owner who will
perform daily LCD operation.
How to Use This Manual
Read the 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 product
development. It is probably that there are changes of manual in subsequent inverter
edition. The latest manual can be acquired via www.sungrowpower.com.

II
Symbols Explanation
Important instructions contained in this manual should be followed during
installation, operation and maintenance of the inverter. And they will be highlighted
by the following symbols.
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.

III
Symbols on the Inverter Body
Disconnect the inverter from mains and PV generator before
service!
Do not touch any inner live parts until 10 minutes after
disconnection from the utility grid and the PV input.
Hot surface! In order to reduce the risk of burns, do not touch the
hot surface when the device is running.
Look over the user manual before any operation on the inverter!
The installation and service of the inverter unit can be performed
only by qualified personnel.

IV
Contents
About This Manual ..........................................................................I
1Safety Instructions...................................................................1
2Product Introduction ...............................................................6
2.1Intended Usage......................................................................................................6
2.2Product Description..............................................................................................7
2.2.1 Inverter Appearance.................................................................................................7
2.2.2 Inverter Dimensions.................................................................................................8
2.2.3 LCD Display Panel......................................................................................................8
2.3Technical Description...........................................................................................9
2.3.1 Circuit Description ....................................................................................................9
2.3.2 Functions Description ..........................................................................................10
3Unpacking and Storing..........................................................12
3.1Unpacking and Inspecting.............................................................................. 12
3.2Moving the Inverter........................................................................................... 12
3.3Identifying the Inverter .................................................................................... 13
3.4Delivery Contents............................................................................................... 14
3.5Storing the Inverter ........................................................................................... 15
4Securing Inverter to the Wall.................................................16
4.1Selecting Installation Location...................................................................... 16
4.2Moving Inverter to Installation Site ............................................................. 19
4.3Installing the Inverter........................................................................................ 20
5Electrical Connection.............................................................24
5.1Overview of Electrical Connection............................................................... 24
5.2Terminals Description ....................................................................................... 26
5.3Meter Connection (optional).......................................................................... 26
5.4Connecting Inverter to Grid............................................................................ 27
5.4.1 AC Side Requirements .......................................................................................... 27

V
5.4.2 Assembling AC Cables to Connector .............................................................. 29
5.5Connecting Inverter to PV Arrays..................................................................30
5.5.1 PV Inputs Configuration ...................................................................................... 31
5.5.2 Assembling DC Cable to Connector................................................................ 33
5.5.3 DC Wiring Procedure............................................................................................. 35
5.6Grounding the Inverter.....................................................................................37
5.6.1 Grounding System Overview............................................................................. 37
5.6.2 Second Protective Earth Terminal.................................................................... 38
5.7Communication Connection .......................................................................... 39
5.7.1 Interfaces Overview .............................................................................................. 39
5.7.2 RS485 Communication Connection................................................................ 40
5.7.3 Ethernet Communication Connection........................................................... 42
5.7.4 Power Control Configuration............................................................................. 45
6Visiting and Configuring the Webserver ..............................49
6.1User and Authority .............................................................................................49
6.2Login Interface..................................................................................................... 49
6.3Main Interface ...................................................................................................... 50
6.3.1 Summary Information.......................................................................................... 50
6.3.2 Detailed Information ............................................................................................ 51
6.4Parameter Settings............................................................................................. 52
6.4.1 System Parameters ................................................................................................ 52
6.4.2 Operating Parameters .......................................................................................... 52
6.4.3 Protection Parameters.......................................................................................... 53
6.4.4 Communication Parameters .............................................................................. 55
6.5History Record......................................................................................................55
6.5.1 Running Record ...................................................................................................... 55
6.5.2 Fault Record.............................................................................................................. 56
6.5.3 Event Record............................................................................................................ 56
6.6Power Control Configuration.......................................................................... 56
6.7System Information............................................................................................ 57
7Commissioning ......................................................................58

VI
7.1Inspection before Commissioning............................................................... 58
7.2Commissioning Procedure.............................................................................. 58
8Disconnecting, Dismantling and Disposing of the Inverter 61
8.1Disconnecting the Inverter............................................................................. 61
8.2Dismantling the Inverter.................................................................................. 62
8.3Disposing of the Inverter................................................................................. 62
9Troubleshooting and Maintenance ......................................63
9.1Troubleshooting ................................................................................................. 63
9.1.1 Troubleshooting of LED Indicators..................................................................63
9.1.2 Troubleshooting of Faults on LCD Screen..................................................... 63
9.2Maintenance ........................................................................................................ 68
9.2.1 Routine Maintenance ...........................................................................................68
9.2.2 Maintenance Instruction ..................................................................................... 69
10Operating the LCD Menu .......................................................70
10.1Description of Button Function..................................................................... 70
10.2Inverter Menu Structure................................................................................... 71
10.3Main Screen.......................................................................................................... 72
10.4Adjusting Contrast ............................................................................................. 74
10.5Viewing Detailed Running Information ..................................................... 74
10.6Starting and Stopping the Inverter.............................................................. 76
10.7Inputting Password............................................................................................ 76
10.8Button Operation for Parameters Setting.................................................. 77
10.9Setting Parameters............................................................................................. 77
10.9.1 Setting the Time...................................................................................................77
10.9.2 Selecting the Country Code ............................................................................78
10.9.3 Feed Setting...........................................................................................................80
10.9.4 PF Setting................................................................................................................80
10.9.5 Setting Communication Parameters............................................................80
10.9.6 Load Default ..........................................................................................................81
11Viewing PV Plant Information...............................................83
11.1SolarInfo Bank Connection ............................................................................. 83

VII
11.1.1 For Common User................................................................................................ 83
11.1.2 For Professional User .......................................................................................... 84
11.2Registration and Adding PV Plant................................................................. 87
11.3Viewing Information via the APP................................................................... 91
11.3.1 Acquisition and Installation of the APP ....................................................... 91
11.3.2 SolarInfo Home APP Online Registration.................................................... 94
11.3.3 Visit in “[Direct visit]”mode............................................................................... 95
11.3.4 Visit in “Remote [Login]”mode ........................................................................ 97
12Appendix ................................................................................98
12.1Technical Data......................................................................................................98
12.2Exclusion of Liability ........................................................................................100
12.3About Us ..............................................................................................................101

1
1 Safety Instructions
IMPORTANT SAFETY INSTRUCTIONS
The inverters have been designed and tested strictly according to the international
safety regulations. As electrical and electronic equipments, safety instructions
related to them must be complied with during installation, commissioning,
operation and maintenance. Incorrect operation or work may result in damage to
the life and well-being of the operator or a third party, or
the inverter and other properties that belong to the operator or a third party.
Therefore, the following general safety instructions must be read and always kept in
mind prior to any work. All detailed work-related safety warnings and notes will be
specified at the critical points in corresponding chapter.
All installation and electrical work must be performed only by qualified
personnel. They have
been trained specially;
already read through and understood the manual and other related
documents;
been familiar with safety requirements for electrical system.
Technical personnel mentioned above may perform the following work:
Install the inverter onto the wall.
Connect the inverter into the PV power system.
Connect other devices into the PV power system.
Commission the inverter.
Maintain and service the inverter.

1 Safety Instructions User Manual
2
Before Installation
There is a risk of injury due to improperly handling the device!
Always follow the instructions contained in the manual when moving and
positioning the inverter.
The weight of the equipment can cause injuries, serious wounds, or bruise
if improperly handled.
The device is thoroughly tested and strictly inspected before delivery.
Damage may still occur during shipping.
If there is visible damage to the packaging or the inner contents, or
anything missing, contact the device dealer.
During Installation
Prior to installing the inverter onto the wall, it is crucial to make certain that
the inverter is not electrically connected.
System performance loss due to bad ventilation!
The device requires good ventilation during operation. It is essential to keep
the device upright and nothing covering the heat sink to ensure that the
device interior is well cooled down.
During Electrical Connection
All electrical connections must be in accordance with local and national
standards.
Only with the permission of the local energy sector, the inverter can be
connected into the utility grid.

User Manual 1 Safety Instructions
3
Lethal voltage!
PV arrays will produce electrical energy when exposed to sunlight and thus
can create an electrical shock hazard.
Wiring of the PV arrays should be performed only by qualified personnel.
All cables must be firmly attached, undamaged, properly insulated and
adequately dimensioned.
During Inverter Operation
Do not open the enclosure when the inverter is under voltage. There is a highly
unlikely risk of explosion in very specific cases of fault. The enclosure will protect
persons and property from such an explosion, only if it is correctly sealed.
There is a risk of inverter damage or personal injury!
DO NOT disconnect DC connectors while the inverter is under AC load! First
de-energize the device from dual power sources and then verify that there is
no voltage present.
There is a risk of burn!
DO NOT touch the device hot parts (such as heat sink) during operation.
Only LCD display panel and DC switch can be touched during inverter
operation.

1 Safety Instructions User Manual
4
Maintenance and Service
Always keep in mind that the inverter is power supplied by dual power
sources: PV arrays and utility grid.
There is a risk of inverter damage or personal injury due to incorrect service
work!
Before any service work, you should obey the following procedures.
Disconnect the inverter from the utility grid first and then PV arrays;
Wait at least 10 minutes until the inner capacitors discharge completely;
Verify that no voltage and current is present with appropriate testing
device.
Keep non-related persons away!
A temporary warning sign and barrier must be posted to keep non-related
persons away in any period while performing electrical connection and
service work.
Any fault that may impair the inverter safety functions must be repaired
immediately before the inverter is restarted.
Inverter contains no owner 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 more
recent revision of the manual which is clearly and thoroughly
understood.
There is a risk of inverter damage if it is improperly serviced.
Use only accessories and spare parts approved by the inverter
manufacturer. Never modify the inverter or its components. Otherwise, it
will cause loss of any or all warranty rights.

User Manual 1 Safety Instructions
5
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 with the boards during replacement.
Others
The selected country settings can be changed only by service personnel!
Unauthorized alternation of the country settings is prohibited. Otherwise it
may cause a breach of the type-certificate marking.
All safety instructions, warning labels and nameplate on the inverter body:
Must be clearly visible;
Must not be removed, covered or pasted.
These regulations should also be followed:
The regulations related to the electricity fed into grid;
The safety instructions related to the PV arrays;
The safety instructions related to other electrical devices.

6
2 Product Introduction
2.1 Intended Usage
The inverters, which are 3-phase string inverters without transformer, are crucial
units between the PV strings and utility grid in the small-scaled PV power system.
Inverter is dedicated to converting the DC power generated by the PV modules into
AC power, which conforms to the parameters of local utility grid, and feeds the
alternating current into the utility grid. The intended usage of the inverter is
illustrated in Fig. 2-1.
By setting the upper limit of feed power, the inverter will run with power derating
once the meter detects that the output power is greater than the set value.
Any other or additional usage is not permitted except the intended usage.
Neither the DC positive pole nor the DC negative pole of the PV strings is
permitted to be grounded.
Grid Dispatch Center
Household Load
AB
C
F
E
K
Jumper switch
D
Fig. 2-1 Inverter Application in 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 SG3KTL-EC, SG4KTL-EC, SG5KTL-EC and SG6KTL-EC.
C Metering device Meter cupboard with power distribution system.

User Manual 2 Product Introduction
7
Item Description Remar
k
D Smart energy
meter (optional)
Three-phase electronic energy meter, used to measure
the active power output. Communicate with the
inverter via RS485 port.
E Utility grid TT, TN-C, TN-S, TN-C-S.
F Household load Household appliances.
2.2 Product Description
2.2.1 Inverter Appearance
3
2
4657
1
Fig. 2-2 Inverter Appearance
No. Name Description
1 LCD display panel Human-computer interaction interface for looking
up running information and configuring
parameters.
2 Side grips The side grips are designed for holding the unit
when mounting, moving or servicing the inverter.
3 Second PE terminal As specified in EN 50178.
4 AC connection terminal Inverter feeds power to utility grid via this terminal.
5 Communication
connection terminals
They are RS485 terminal, Wi-Fi terminal, NET
terminal and DI terminal.
6 DC terminals There are two pairs of DC terminals for PV input on
the bottom of the inverter.
7 DC switch During normal operation it is in “ON” state. It can
shut down the inverter in “OFF” position.

2 Product Introduction User Manual
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2.2.2 Inverter Dimensions
Fig. 2-3 Outline Dimensions
Tab. 2-1 Dimension Values
Type W(mm) H(mm) D(mm) Net weight(kg)
SG3KTL-EC 403 518 190 22
SG4KTL-EC 403 518 190 22
SG5KTL-EC 403 518 190 22
SG6KTL-EC 403 518 190 22
2.2.3 LCD Display Panel
As a human-computer interaction interface, LCD display panel is on the front panel
and comprises LED indicators, buttons and LCD screen.
LED indicators indicate the working status of the inverter.
By pressing the buttons user can look up information and configure parameters.
LCD screen shows the current running information.
Fig. 2-4 LCD Display Panel

User Manual 2 Product Introduction
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No. Name Description
1 LED indicators “RUN” and “FAULT”. The current running state can be
known from the two indicators. Detailed definition is
shown in Tab. 2-2.
2 Buttons User can operate the LCD menu via the two buttons.
Detailed function is shown in Tab. 10-1.
3 LCD Screen LCD screen can display the current state, current running
information, historical information, and parameters to be
set.
Tab. 2-2 Description of LED Indicators
Name State Description
“RUN”
On The inverter is feeding power to the utility grid or in derating
operation.
Blinking The inverter is in the process of startup.
Off Other states.
“FAULT”
On Communication error, permanent fault, or upgrade failure.
Blinking Other faults (alarms excluded).
Off No fault occurs.
2.3 Technical Description
2.3.1 Circuit Description
Fig. 2-5 shows the main circuit of the inverter.
The boost circuits raise the input DC voltage. Two string MPP trackers can be utilized
to ensure the maximum power from PV arrays.
The three-level inverter circuit converts the DC power into AC power, which will be
fed into the utility grid via AC terminal.
Meanwhile inverter is equipped with protective circuit to guarantee its safety
operation which can trigger the AC relay if required.
Additionally, a DC switch is integrated for safe disconnection of DC current.
The inverter provides RS485 port, Wi-Fi terminal, and NET port for communication.
Users can look up running information and set parameters through LCD display
panel.

2 Product Introduction User Manual
10
Fig. 2-5 Main Circuit Diagram of inverter
2.3.2 Functions Description
Inverter functions can be grouped as the following:
Conversion function
Inverter converts the DC power into AC power, which conforms to the grid
requirements of its installation country.
Parameters configuration
Inverter provides various parameters configuration for optimal operation.
Communication interfaces
RS485 serial communication with RJ45 port (RS485), Ethernet communication
with RJ45 port (NET), Wi-Fi and DI connection terminals.
Earth fault alarm
With a standard Ethernet interface and a Wi-Fi terminal equipped, the inverter
can be connected to the router via a network cable or the Wi-Fi antenna. Then
both the inverter information and alarm signals will be uploaded to the cloud
server SolarInfo Bank. When the server receives an earth fault signal, it will
automatically send warning e-mail to the registered user.
Zero export (0% feed-in function, optional)
At the grid-connection point, the three-phase SUNGROW Energy Meter is used
for measuring the feed-in power. Enable the feed setting and set the limit value
via the LCD menu. Then the inverter will run with power derating once the meter
detects that the feed-in power is above the set value.
Protection functions include:
−Short circuit protection
−Insulation resistance detection and alarm
−Inverter output voltage monitoring
−Inverter output frequency monitoring