Sungrow SG36KTL-M User manual

SG36KTL-M-UEN-Ver16-201901 Version: 1.6
User Manual
SG36KTL-M
PV Grid-Connected
Inverter

I
About This Manual
This manual is for the inverter SG36KTL-M. The inverter is 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, providing you guidelines to
connect the inverter into the PV power system and 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.
All rights reserved including the pictures, markings and symbols used. Any
reproduction or disclosure, even partially, of the contents of this manual is strictly
prohibited without prior written authorization of Sungrow.
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
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. 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.
Symbols on the Inverter Body
10 min
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.

III
Contents
About This Manual .......................................................................... I
1Safety Instructions...................................................................1
2Product Introduction ...............................................................6
2.1 Intended Usage...................................................................................................6
2.2 Product Description...........................................................................................7
2.2.1 Model Description.................................................................................................7
2.2.2 Product Appearance............................................................................................. 7
2.2.3 Dimensions of Inverter ........................................................................................8
2.2.4 LCD Display Panel..................................................................................................8
2.2.5 DC Switch.................................................................................................................9
2.3 Technical Description........................................................................................9
2.3.1 Principle Description............................................................................................ 9
2.3.2 Functions Description........................................................................................10
2.3.3 Derating..................................................................................................................11
3Installation Flow.....................................................................13
4Unpacking and Storage.........................................................15
4.1 Unpacking and Inspection ........................................................................... 15
4.2 Identifying Inverter ......................................................................................... 16
4.3 Delivery Contents............................................................................................ 17
4.4 Storage of Inverter .......................................................................................... 17
5Installing Inverter onto Wall..................................................19
5.1 Installation Site Selection.............................................................................. 19
5.2 Moving Inverter to Installation Site............................................................ 22
5.3 Installation Tools .............................................................................................. 22
5.4 Installing the Inverter ..................................................................................... 23
5.4.1 Installing on Metal Frame .................................................................................24
5.4.2 Installing on Concrete Wall...............................................................................26

IV
6Electrical Connection .............................................................28
6.1 Terminals Description..................................................................................... 28
6.2 Connecting Inverter to AC Grid...................................................................30
6.2.1 AC Side Requirements .......................................................................................30
6.2.2 Grid Connection ..................................................................................................32
6.3 Connecting Inverter to PV Arrays................................................................ 36
6.3.1 PV Inputs Configuration....................................................................................36
6.3.2 PV Connection Procedures...............................................................................38
6.4 Grounding the Inverter..................................................................................41
6.4.1 Grounding System Overview ..........................................................................41
6.4.2 Second Protective Earth Terminal..................................................................42
6.5 Communication Connection........................................................................43
6.5.1 Communication Overview ...............................................................................43
6.5.2 Communication System....................................................................................44
6.5.3 RS485 Communication Connection..............................................................45
7Commissioning ......................................................................47
7.1 Inspection before Commissioning .............................................................47
7.2Commissioning Procedure............................................................................47
8Disconnecting, Dismantling and Disposing the Inverter ....51
8.1 Disconnecting the Inverter...........................................................................51
8.2 Dismantling the Inverter................................................................................51
8.3 Disposing the Inverter.................................................................................... 52
9Troubleshooting and Maintenance ......................................53
9.1 Troubleshooting...............................................................................................53
9.1.1 Troubleshooting of LED Indicator..................................................................53
9.1.2 Troubleshooting of Faults in LCD Screen.....................................................53
9.2 Maintenance...................................................................................................... 58
9.2.1 Routine Maintenance.........................................................................................58
9.2.2 Maintenance Instruction...................................................................................58
10 Operation of LCD Display ......................................................61
10.1 Description of Button Function...................................................................61

V
10.2 Inverter Menu Structure................................................................................ 62
10.3 Main Screen....................................................................................................... 63
10.4 Adjust Contrast................................................................................................. 64
10.5 Checking Running Information................................................................... 64
10.6 Checking History Information ..................................................................... 66
10.6.1 Checking Fault Records...................................................................................66
10.6.2 Checking History Event Records ..................................................................66
10.6.3 Checking Running Records............................................................................66
10.6.4 Checking Energy Records...............................................................................67
10.7 Starting/Stopping............................................................................................ 68
10.8 Password Entry................................................................................................. 68
10.9 System Parameter Setting............................................................................. 69
10.9.1 Language Setting..............................................................................................69
10.9.2 Time Setting........................................................................................................70
10.9.3 Total Energy Deviation Adjustment ............................................................70
10.9.4 Load Default .......................................................................................................71
10.9.5 Checking Firmware Version ...........................................................................71
10.10 Running Parameter Setting.......................................................................... 71
10.10.1 Main Screen of Run-param..........................................................................71
10.10.2 Active/Reactive Power Parameters ...........................................................73
10.10.3 Reactive Power Regulation..........................................................................74
10.10.4 Reactive Power Setting for Italy/Thailand...............................................77
10.10.5 Save P/Q-set .....................................................................................................79
10.10.6 Time Parameters..............................................................................................79
10.10.7 LVRT Parameter ...............................................................................................80
10.10.8 HVRT Parameter ..............................................................................................80
10.10.9 Derating Parameters......................................................................................80
10.10.10 ISO Parameters..............................................................................................81
10.11 Protection Parameter Setting ...................................................................... 81
10.11.1 Country(region) Setting................................................................................82
10.11.2 Single-stage Protection Parameter Setting............................................83
10.11.3 Multi-stage Protection Parameter Setting..............................................84

VI
10.11.4 Protection Recovery Setting .......................................................................85
10.11.5 Protection Parameter Confirmation .........................................................85
10.12 Communication Parameter Setting ...........................................................85
10.13 Advanced Parameters Setting...................................................................... 86
10.13.1 PVS Detect Settings.......................................................................................86
10.13.2 10min Max-V....................................................................................................87
10.13.3 Grid Unbalance ...............................................................................................88
11 Appendix ................................................................................89
11.1 Technical Data Technical Data......................................................................89
11.2 Exclusion of Liability........................................................................................ 90
11.3 Contact Information........................................................................................ 92

1
1 Safety Instructions
IMPORTANT SAFETY INSTRUCTIONS
The SG36KTL-M has 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:
The property safety of the operator or a third party
The inverter and other properties that belong to the operator or a third party
Therefore, the following 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
Been trained specially;
Already completely 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
Before Installation
There is a risk of injury due to improperly handling the device!

1 Safety Instructions User Manual
2

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.
During Installation
Prior to installing the inverter onto the wall, it is crucial to make certain that the
inverter is not electrically connected.
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 in
order to ensure that the equipment interior is well cooled down.
During Electrical Connection
Lethal voltage exists!
PV arrays will generate electrical energy when exposed to sunlight and thus
can create an electrical shock hazard.
Wiring of the PV arrays should only be performed by qualified personnel.
PV modules should be covered by opaque materials during wiring.
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 an unlikely

User Manual 1 Safety Instructions
3
but possible risk of explosion in very specific cases of fault. 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.
Operate the inverter by strictly following the descriptions in this manual to avoid
unnecessary injury to the persons and damage to the device. Arc flash, fire or
explosion may follow if otherwise and Sungrow will hold no liability for the
damages followed.
At least the following improper operations can cause the arc flash, fire and
explosion inside the device. Remember all the time that these accidents can
only be handled by qualified personnel. Improper handling of the accidents
occurred may lead to more serious fault or accident.
Plugging in and unplugging the DC side HV fuse when it is alive;
Touching the end of the cables that have no insulation and may still be
alive;
Touch the connection copper bus bar, terminal or other spare parts inside
the device that may be alive;
The power cable connection is loose;
Spare parts like the bolts are falling inside the inverter;
Incorrect operation of the non-qualified persons that receives no training;
Before any operation to the device, a beforehand assessment of the possible

1 Safety Instructions User Manual
4
arc flash in the operation area is necessary. If there is arc flash,
The operators must receive related safety trainings;
Try the best to assess the areas that may appear the electric shock;
Before any operation in the area that may appear electric shock, wear
personal protective equipment (PPE) that meets the requirement. A PPE
category 2 is recommended.
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.
Disconnect inverter from the utility grid side first and then PV arrays;
Wait at least ten minutes until the inner capacitors discharge completely;
Verify that no voltage or 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 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.
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 the components of the inverter.

User Manual 1 Safety Instructions
5
Otherwise it may void any or all warranty rights from Sungrow.
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.
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.
Others
All safety instructions, warning labels and nameplate on the inverter body:
Must be clearly visible;
Must not be removed, covered and pasted.
These regulations should also be followed:
The regulations related to the electricity fed into grid;
The safety instructions related to PV arrays;
The safety instructions related to other electrical device.
The selected country(region)
settings can be changed by qualified
personnel only!
Unauthorized modification of country(region) settings is prohibited.
Alternation of the country(region) settings may cause a breach to the
type-certificate marking.

6
2 Product Introduction
2.1 Intended Usage
SG36KTL-M (It will be referred to as inverter hereinafter unless otherwise specified)
which is a 3-phase string inverter without transformer, is a crucial unit between the
PV strings and utility grid in the 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 it 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.
AB C D
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 SG36KTL-M
C Metering device meter cupboard with power distribution system
D Utility grid TN-C, TN-C-S, IT

User Manual 2 Product Introduction
7
L2
L1
L3
SG36KTL-M
PE
IT
Transformer
L2
PEN
L1
L3
SG36KTL-M
PE
TN-C
Transformer Transformer
L2
N
L1
L3
SG36KTL-M
PE
TN-C-S
PE
If the PV system exceeds the capacity of one inverter, it is possible to connect several
inverters into the PV system, with each one connected to an appropriate section of
PV inputs and on the AC side they connected in parallel to the grid.
2.2 Product Description
2.2.1 Model Description
The model description is as follows:
SG 36K TL M
-
Multiple inputs of MPPTs
Transformerless
Code of power level
Code of PV grid-connected inverter
Tab. 2-1 Power description
2.2.2 Product Appearance
7
6
8
2
5
3
1
6
4
Fig. 2-2 Product Components Description
Model
Nominal output power
Nominal grid voltage
SG36KTL-M 36000W 3 / PE or 3 / N / PE, 230 / 400 V

2 Product Introduction User Manual
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*Image shown here is for reference only. Actual product you receive may differ.
Item
Name
Description
1 LCD display panel
Inverter operation data viewing and parameters
configuration can be performed via the LCD display
panel.
2 Connection terminals
They are DC input terminals, AC output terminal
and RS485 communication terminal.
3 Second PE Terminals
Second protective earth terminals as specified in EN
50178.
4 Fans
There are four fans to perform controlled forced-air
cooling.
5 Handles
The handles are designed for holding the unit when
transporting, installing or servicing.
6
Air outlet
Exit of hot air during the inverter operation.
7
Mounting ear
It is used for hanging inverter onto the backplate.
8 DC switch
During normal operation it is in “ON” state. It can
shut down the inverter immediately in “OFF”
position.
2.2.3 Dimensions of Inverter
267.7
740
525
690
240
Fig. 2-3 Outline Dimensions of Inverter (unit: mm)
2.2.4 LCD Display Panel
As an HMI, LCD display panel comprises LED indicators, buttons and LCD display
screen on the front panel of the inverter.
LEDs indicate the working status of the inverter
The current running information shown on the LCD display
Fault records shown on the LCD display
Inverter configuration by pressing the buttons

User Manual 2 Product Introduction
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1
1
3
2
2
Fig. 2-4 LCD Display Panel
Tab. 2-2 LCD Display Panel Description
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. 2-3.
2 Buttons
Navigate in the LCD menu, set 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.
Tab. 2-3 Description of LED Indicator Status
LED Status
Description
“RUN”: on;
Inverter is feeding AC power to the utility grid.
“FAULT”: off
“RUN”: off;
A fault happens;
or protection function triggers.
“FAULT”: on
“RUN”: off;
Inverter is not energized;
or there is a communication error between DSP and LCD.
“FAULT”: off
“RUN”: Flicker
Warning information occurs to the inverter.
“FAULT”: OFF
2.2.5 DC Switch
DC switch is designed for safely disconnecting the DC input current if required.
The inverter works automatically when input and output meet the requirements.
Rotating DC switch to the “OFF” position will immediately cut off the flow of DC
current.
Rotate the DC switch to the “ON”position, before restarting the inverter.
2.3 Technical Description
2.3.1 Principle Description
PV strings input voltage is transmitted to DC BUS via Boost circuit.

2 Product Introduction User Manual
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The SG36KTL-M is equipped with MPPTs for 3 DC inputs to ensure that the
maximum power can be utilized even in different PV modules installation
conditions.
Inversion circuit converts DC power into AC power, which will be fed into the utility
grid via AC terminals. Protective circuits are designed to guarantee inverter safe
operation and human safety.
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.
The principle design is illustrated below:
Fig. 2-5 Main Circuit Diagram of SG36KTL-M
2.3.2 Functions Description
Inverter functions can be grouped as the following:
Conversion function
Inverter converts the direct current power into alternating current power, which
conforms to the grid requirement of its installation country(region).
Data storage and display
Inverter stores essential data including running information and fault records,
and displays them on integrated LCD display.
Parameters configuration
Inverter provides various parameters configuration for optimal operation.
Communication interface
Standard RS485 interface for connecting other monitoring devices into the PV
system is included.
Protection functions
−Short circuit protection

User Manual 2 Product Introduction
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−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
2.3.3 Derating
Derating the output power is a way to protect the inverter from overload and
potential faults. Inverter’s derating function can be activated in the following
scenarios:
Grid voltage too low
Temperature too high (Inner temperature and power modules temperature)
Power limit setting on the inverter LCD display or remote dispatch
Grid frequency too high [when the Country(region) selection is “DE” or“IT”]
Power Limit Setting
User may allocate output power value of the inverter via LCD control panel or the
remote dispatch from the grid company.
Over-temperature Derating
Power modules over-temperature may result from high ambient temperature, poor
ventilation or fault of fans. Over-temperature derating may protect the inverter as
well as the power modules against damage.
When the modules temperature exceeds an upper limit, the inverter start to
gradually derating until the temperature decreases to normal range.
When the inner temperature exceeds an upper limit, the inverter start to
gradually derating until the temperature decreases to normal range.

2 Product Introduction User Manual
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Ambient temperature (℃)
45 50 60
40 55
0.6
1.2
1.0
0.8
0.2
0.4
P/Pn
Fig. 2-6 Over-temperature Derating (Pf=1)
Lower limit of the over-temperature derating: 60% of the nominal
power.
If the modules temperature and the inner temperature are both exceed
the limit, the actual derating power value will be the less one.
Grid Under-voltage Derating
Once the grid voltage is in the defined range of Vgrid(Vmin…400V), the inverter will
decrease the power output.
P[Vmin…400V] = Pmax ×(Vgrid / 400V)
Vgrid [V]
0
P max.
400
V
min
V
max
Working area
Fig. 2-7 Grid Under-voltage Derating