Sungrow SG10KTL User manual

SG10_12_15_20KTLV41-UEN-Ver30-201412 Version: 3.0
User Manual

SG10KTL/SG12KTL/
SG15KTL/SG20KTL
PV Grid-Connected Inverter

I
About This Manual
This manual is for the inverters SG10KTL, SG12KTL, SG15KTL and SG20KTL. These
inverters are grid-connected, transformer-less, robust and of high conversion
efficiency. The device will bring you profit from 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 how 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
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 with 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 visiting the web page
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
This symbol indicates that you should wait at least 10 minutes after
disconnecting the inverter from the utility grid and from the PV
input before touching any inner live parts.
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 only be
performed by qualified personnel.
Do not disconnect DC connectors from the unit under load!

IV
Contents
1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 LCD Display Panel......................................................................................................8
2.2.4 DC Switch .....................................................................................................................9
2.3Technical Description........................................................................................ 10
2.3.1 Principle Description.............................................................................................10
2.3.2 Functions Description ..........................................................................................11
2.3.3 Derating .....................................................................................................................12
3Installation Flow.....................................................................14
4Unpacking and Storage .........................................................16
4.1Unpacking and Inspection.............................................................................. 16
4.2Identifying Inverter............................................................................................ 17
4.3Delivery Contents............................................................................................... 18
4.4Storage of Inverter ............................................................................................. 19
5Installing Inverter onto Wall..................................................20
5.1Selecting Installation Location ...................................................................... 20
5.2Moving Inverter to Installation Site ............................................................. 23
5.3Mounting the Inverter ...................................................................................... 23
5.3.1 Installing the Inverter on Concrete Wall ........................................................ 24
5.3.2 Installing the Inverter on Metal Frame...........................................................25
6Electrical Connection.............................................................27
6.1Terminals Description ....................................................................................... 27
6.2Simplified Electrical Connection Diagram ................................................ 28

V
6.3Connecting Inverter to AC Grid ..................................................................... 30
6.3.1 AC Side Requirements.......................................................................................... 30
6.3.2 Connecting Inverter to AC Grid ........................................................................ 32
6.4Connecting Inverter to PV Arrays.................................................................. 35
6.4.1 PV Inputs Configuration ...................................................................................... 35
6.4.2 Assembling DC Cable to Connector ............................................................... 38
6.4.3 Wiring Procedures.................................................................................................. 39
6.5Grounding the Inverter.....................................................................................42
6.5.1 Grounding System Overview............................................................................. 42
6.5.2 Second Protective Earth Terminals.................................................................. 43
6.6Communication Connection .......................................................................... 44
6.6.1 Communication Overview.................................................................................. 44
6.6.2 Communication System ...................................................................................... 45
6.6.3 RS485 Communication Connection................................................................ 46
7Commissioning ......................................................................48
7.1Inspection before Commissioning ............................................................... 48
7.2Commissioning Procedure .............................................................................. 48
8Disconnecting, Dismantling and Disposing the Inverter....51
8.1Disconnecting the Inverter .............................................................................51
8.2Dismantling the Inverter.................................................................................. 52
8.3Disposing the Inverter ......................................................................................52
9Troubleshooting and Maintenance ......................................53
9.1Troubleshooting.................................................................................................. 53
9.1.1 Troubleshooting of LED Indicator.................................................................... 53
9.1.2 Troubleshooting of Faults in LCD Screen ...................................................... 54
9.2Maintenance......................................................................................................... 58
9.2.1 Routine Maintenance ........................................................................................... 58
9.2.2 Maintenance Instruction..................................................................................... 58
9.3Contact Sungrow Service................................................................................. 61
10Operation of LCD Display Panel ............................................62
10.1Description of Button Function..................................................................... 62

VI
10.2Inverter Menu Structure................................................................................... 63
10.3Main Screen .......................................................................................................... 64
10.4Adjust Contrast.................................................................................................... 65
10.5Detailed Running Information....................................................................... 66
10.6History Records ................................................................................................... 67
10.6.1 Running Information Records......................................................................... 67
10.6.2 Fault Records ......................................................................................................... 67
10.7Start and Stop Inverter ..................................................................................... 68
10.8Input Parameter Settings Password............................................................. 68
10.9System Parameters Setting............................................................................. 69
10.9.1 Language Setting ................................................................................................ 69
10.9.2 Time Setting...........................................................................................................69
10.9.3 Energy Deviation Adjustment.........................................................................69
10.9.4 Load Default ..........................................................................................................70
10.9.5 Firmware Version..................................................................................................70
10.10Running Parameter Setting ............................................................................ 71
10.10.1 Main Screen of Run-param ............................................................................ 71
10.10.2 Reactive Power Regulation............................................................................72
10.10.3 Save P/Q-set ........................................................................................................ 74
10.11Protective Parameters Setting ....................................................................... 75
10.12Communication Parameters Setting........................................................... 78
10.13PV Configuration Mode Setting.................................................................... 78
10.14Special Settings for Italy................................................................................... 79
10.14.1 Over-frequency Derating Setting for Italy ............................................... 79
10.14.2 Reactive Power Regulation for Italy ...........................................................80
10.14.3 Protective Parameters Setting for Italy ..................................................... 82
11Appendix ................................................................................85
11.1Technical Data ..................................................................................................... 85
11.2Terminals and Cables ........................................................................................ 87
11.3Exclusion of Liability.......................................................................................... 88
11.4About Us ................................................................................................................ 89

1
1 Safety Instructions
IMPORTANT SAFETY INSTRUCTIONS
The SG10KTL, SG12KTL, SG15KTL and SG20KTL have been designed and tested
strictly according to the international safety regulations. As electrical and electronic
equipment, safety instructions related to them must be complied with during
installation, commissioning, operation and maintenance. Incorrect operation or
work may 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
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 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:
yInstall the inverter onto the wall
yConnect the inverter into the PV power system
yConnect other devices into 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 due to improperly handling the device!
yAlways follow the instructions contained in the manual when moving and
positioning the inverter.
yThe weight of the equipment can cause injuries, serious wounds, or bruise
if improperly handled.
The unit 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 if there
is something missing, contact the unit 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 equipment requires good quality ventilation during operation. It is
essential to keep the unit upright and nothing covering the heat sink to
ensure that the equipment 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 exists!
PV arrays will produce electrical energy when exposed to sunlight and thus
can create 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.
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 malfunction. The housing 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 equipment from dual power sources and then verify that
there is no voltage present.
There is a risk of burn!
Prevent from touching 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
There is a risk of inverter damage or personnel 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, you should obey the following procedures.
yDisconnect inverter from the utility grid side first and then PV arrays;
yWait at least ten minutes until the inner capacitors discharge completely;
yVerify that no voltage and current present with appropriate testing
device.
Keep unrelated person away!
A temporary warning sign and barrier must be posted to keep non-related
person away for any period while performing electrical connection and
service work.
yAny malfunction that may impair the inverter safety functions must be
repaired immediately before the inverter is restarted again.
yInverter 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 equipment or more
recent revision of the manual which is clearly and thoroughly
understood.

User Manual 1 Safety Instructions
5
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 other components of the
inverter. Otherwise it will cause loss of any or all warranty rights.
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 by service personnel only!
Unauthorized alternation of the country settings should be prohibited.
Otherwise it may cause a breach of 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 device.

6 
2 Product Introduction
2.1 Intended Usage
SG10KTL, SG12KTL, SG15KTL and SG20KTL (They will be referred to as inverter
hereinafter unless otherwise specified), 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 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. The intended usage of the
inverter is illustrated in Fig. 2-1.
Inverter CANNOT be connected to the PV modules, the positive or negative
terminal of which needs to be grounded.
Fig. 2-1 Application of the inverter of the PV Power System
Item Description Note
A PV strings
monocrystalline silicon; polycrystalline silicon and thin-film
without grounding
B Inverter SG10KTL, SG12KTL ,SG15KTL or SG20KTL involved
C Metering
device meter cupboard with power distribution system
D Utility grid TT, TN-C, TN-S, TN-C-S

User Manual 2 Product Introduction
7
Any other or additional usage is not permitted except the intended usage.
Inverter may only accept PV modules with 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 inverter and AC circuit breaker on the distribution board.
Additionally, the unit is intended for fixed installation. Located on a part
that is not removable without impairing the operation of the unit.
2.2 Product Description
2.2.1 Product Appearance
Fig. 2-2 Product Components Description
Item Name Description
1 LCD display
panel
Inverter operation data viewing and parameters
configuration can be performed via the LCD display panel.
2 Handles The handles are designed for holding the unit when
transporting, installing or servicing.
3 Connection
terminals
They are DC input terminals, AC output terminal and RS485
communication terminal.
4 Air inlet Entrance of cool air.
5 DC switch During normal operation it is in “ON” state. It can shut down
the inverter immediately in “OFF” position.
6 Second PE
terminals Second protective earth terminals as specified in EN 50178.
7 Air outlet Exit of hot air during the inverter operation.
8 Mounting ear It is used for hanging inverter onto the backplate.

2 Product Introduction User Manual
8
2.2.2 Dimensions and Weight of Inverter
Fig. 2-3 Outline Dimensions of Inverter
Type W(mm) H(mm) D(mm) Net weight(kg)
SG10KTL/SG12KTL/SG15KTL 648 686 246 50
SG20KTL 648 686 246 55
2.2.3 LCD Display Panel
As a human-computer interaction interface, LCD display panel comprises LED
indicators, buttons and LCD display screen on the front panel of the inverter
yLEDs indicate the working status of the inverter
yThe current running information shown on the LCD display
yMalfunction records shown on the LCD display
yInverter configuration by pressing the buttons
Fig. 2-4 LCD Display Panel
No. Name Description
1 LED
indicators
“RUN” and “FAULT”. Inverter current state can be known from
the two indicators. Detailed definition is shown in Tab. 2-1.
2 Buttons
Navigate in the LCD menu, select values and so on. Detailed
function is shown in Tab. 10-1.
3 LCD
screen
LCD screen can display current state of inverter, current running
information, history information and parameters to be set.

User Manual 2 Product Introduction
9
Tab. 2-1 Description of LED Indicator
LED State Description
“RUN”: on Inverter is feeding AC power to the utility grid.
“FAULT”: off
“RUN”: off A malfunction happens;
or protection function triggers.
“FAULT”: on
“RUN”: off Inverter is not energized;
There is a communication error between DSP and LCD.
“FAULT”: off
2.2.4 DC Switch
DC switch is designed for safely disconnecting the DC current if required.
The inverter works automatically when input and output meet the requirements. If
you want to interrupt its running or if a malfunction occurs, rotate DC switch to the
“OFF”position to stop inverter from running.
Rotate the DC switch to the “ON” position, before restarting the inverter.

2 Product Introduction User Manual
10
2.3 Technical Description
2.3.1 Principle Description
The principle design of transformer-less and grid-connected inverter is illustrated in
Fig. 2-5.
Six PV strings input voltage is transmitted to DC BUS via Boost circuit.
SG10/12/15/20KTL inverters are equipped with MPPTs for two DC inputs to ensure
that the maximum power can be utilized even in different PV installation conditions.
Three-level inverter circuit converts the DC power into AC power, which will be fed
into the utility grid via five core terminals. Protective circuits are designed to
guarantee inverter safe operation and human safety.
A DC switch is integrated for safe disconnection of DC current. The inverter provides
standard interface RS485 for communication. Inverters are also provided running
records display and parameters configuration via human-computer interface –LCD
display panel.
Fig. 2-5 Main Circuit Diagram of Inverter

User Manual 2 Product Introduction
11
2.3.2 Functions Description
Inverter functions can be grouped as the following:
yConversion function
Inverter converts the direct current power into alternating current power, which
conforms to the grid requirement of its installation country.
yData storage and display
Inverter stores essential data including running information and fault records,
and displays them on integrated LCD display.
yParameters configuration
Inverter provides various parameters configuration for optimal operation.
yCommunication interface
Standard RS485 interface for connecting other monitoring devices into the PV
system is included.
yProtection functions include
−Short circuit protection
−Insulation resistance to ground surveillance
−Inverter output voltage surveillance
−Inverter output frequency surveillance
−Residual current protection
−DC component of AC output current surveillance
−Anti-islanding phenomena protection
−Ambient temperature surveillance
−DC over-voltage protection
−Over current protection
−Power module over-temperature protection

2 Product Introduction User Manual
12
2.3.3 Derating
Derating the output power is a way to protect the inverter from overload and
potential malfunctions. Inverter’s derating function can be activated in the following
scenarios:
yPV input overload
yToo low grid voltage
yToo high inner temperature
yPower limit setting on the inverter LCD display
yGrid frequency too high (when the Country selection is “DE” or “IT”)
PV Overload Derating
When the PV input power exceeds the defined TotalInputPowerMax, see Tab. 2-2, the
inverter will reduce the power evenly to the maximum limit and keep the output
power at nominal value.
Tab. 2-2 Maximum Input Power
Type SG10KTL SG12KTL SG15KTL SG20KTL
TotalInputPowerMax 11000W 13000W 15800W 21000W
Fig. 2-6 PV Overload Derating