Sungrow SG250HX User manual

  USERMANUAL 
SG250HXPVGrid‐ConnectedInverter 
I 
Draft_SG250HX‐UserManual_V13_202004 

  USERMANUAL 
SG250HXPVGrid‐ConnectedInverter 
II 
Draft_SG250HX‐UserManual_V13_202004 
  TABLEOFCONTENTS 


Introduction 

1. Safety 

2. ProductDescription 

3. UnpackingandStorage 

4. MechanicalInstallation 

5. ElectricalConnection 

6. Commissioning 

7. iSolarCloudApp 

8. SystemDecommissioning 

9. Troubleshooting 

10. Appendix 

TABLEOFCONTENTS 
III  Draft_SG250HX‐UserManual_V13_202004 

Introduction....................................................................................................................................... 
1. Safety...............................................................................................................1 
1.1 PVPanels.................................................................................................................. 1
1.2 UtilityGrid....................................................................................................................... 1
1.3 Inverter................................................................................................................................... 1
1.4 SkillsofQualifiedPersonnel...........................................................................2 
2. ProductOverview............................................................................3 
2.1 IntendedUsage..............................................................................................3 
2.2 ProductIntroduction.....................................................................................4 
2.2.1 TypeDescription..........................................................................................4 
2.2.2 Appearance......................................................................................................5 
2.2.3 DimensionsandWeight..............................................................................5 
2.2.4 LEDIndicatorPanel.....................................................................................6 
2.2.5 DCSwitch....................................................................................................6 
2.3 CircuitDiagram..............................................................................................7 
2.4 FunctionDescription.....................................................................................7 
3 UnpackingandStorage.................................................................9 
3.1 UnpackingandInspection..............................................................................9 
3.2 IdentifyingtheInverter.................................................................................9 
3.3 ScopeofDelivery..............................................................................................10 
3.4 InverterStorage..................................................................................................... 11
4. MechanicalMounting....................................................................12 
4.1 SafetyduringMounting....................................................................................12 
4.2 LocationSelection................................................................................................12 
4.2.1 InstallationEnvironmentRequirements........................................................13 
4.2.2 CarrierRequirements........................................................................................13 
4.2.3 InstallationAngleRequirements...................................................................13 
4.2.4 InstallationClearanceRequirements............................................................14 
4.3 InstallationTools..................................................................................................15 
4.4 MovingtheInverter.............................................................................................16 
4.4.1 ManualTransport...............................................................................................16 
4.4.2 HoistingTransport.............................................................................................17 
4.5 PVBracket‐MountedInstallation.....................................................................18 
4.5.1 PreparationbeforeMounting............................................................................18 

TABLEOFCONTENTS 
IV  Draft_SG250HX‐UserManual_V13_202004 
4.5.2 MountingSteps..............................................................................................18 
4.6 Wall‐MountedInstallation................................................................................20 
4.6.1 PreparationbeforeMounting.........................................................................20 
4.6.2 MountingSteps.........................................................................................20 
5 ElectricalConnection..................................................................23 
5.1 SafetyInstructions.............................................................................................23 
5.2 TerminalDescription...................................................................................23 
5.3 ElectricalConnectionOverview...................................................................24 
5.4 AdditionalGroundingConnection...............................................................25 
5.4.1 AdditionalGroundingRequirements.........................................................25 
5.4.2 ConnectionProcedure....................................................................................25 
5.5 OpeningtheWiringCompartment..............................................................26 
5.6 ACConnection.............................................................................................26 
5.6.1 ACSideRequirements...............................................................................26 
5.6.2 RequirementsforOT/DTTerminal.................................................................27 
5.6.3 AluminiumCableRequirements...............................................................28 
5.6.4 WiringProcedure......................................................................................28 
5.7 PVStringConnection...................................................................................30 
5.7.1 PVInputConfiguration..............................................................................30 
5.7.2 ConnectionProcedure.........................................................................................31 
5.7.3 InstallingthePVConnectors...........................................................................31 
5.8 WiringofTrackingSystemPowerCable(Optional).........................................32 
5.9 RS485Communication................................................................................33 
5.9.1 CommunicationWiringBoard...................................................................33 
5.9.2 RS485CommunicationSystem.................................................................34 
5.9.3 WiringProcedure......................................................................................35 
5.10 DryContactConnection.............................................................................36 
5.10.1 DryContactFunction................................................................................36 
5.10.2 WiringProcedure.....................................................................................38 
5.11 ClosingtheWiringCompartment...............................................................38 
5.12 CommunicationModuleConnection(optional).........................................38 
6 Commissioning.......................................................................40 
6.1 InspectionbeforeCommissioning...............................................................40 
6.2 CommissioningProcedure......................................................................40 

TABLEOFCONTENTS 
V  Draft_SG250HX‐UserManual_V13_202004 
7 iSolarCloudAPP..............................................................................41 
7.1 BriefIntroduction..................................................................................................41 
7.2 DownloadandInstall........................................................................................41 
7.3 Menu.................................................................................................................42 
7.4 Login.......................................................................................................42 
7.4.1 Requirements............................................................................................42 
7.4.2 LoginSteps................................................................................................42 
7.5 Homepage.............................................................................................44 
7.6 RunningInformation...................................................................................45 
7.7 HistoryRecord.............................................................................................46 
7.7.1 FaultAlarmRecords...................................................................................47 
7.7.2 PowerYieldsRecords................................................................................48 
7.7.3 EventRecords...........................................................................................49 
7.8 More.................................................................................................................49 
7.8.1 ParameterSetting.....................................................................................50 
7.8.2 PasswordChanging...................................................................................50 
8 SystemDecommissioning...............................................................51 
8.1 DisconnectingtheInverter................................................................................51 
8.2 DismantlingtheInverter...................................................................................51 
8.3 DisposaloftheInverter........................................................................................51 
9 Troubleshooting.............................................................................53 
9.1 Troubleshooting................................................................................................53 
9.2 Maintenance.....................................................................................................53 
9.2.1 RoutineMaintenance.....................................................................................59 
10 Appendix.......................................................................................62 
10.1 TechnicalData............................................................................................62 
10.2 QualityAssurance......................................................................................63 
10.3 ContactInformation...................................................................................64 

VI


The user manual describes product information, guidelines for installation, operation and maintenance of the SG250HX inverter.
Installers, operators and maintenance personnel must read this document in its entirety before working on or with this photovoltaic
inverter and its system. The user manual also includes information essential for site designers. The user manual cannot include
complete information about the photovoltaic (PV) system. You can get additional information about other devices at
www.sungrowpower.com or on the webpage of the respective component manufacturer.
Applicability
This user manual is applicable to the following inverter models:
SG250HX
They will be referred to as “inverter” hereinafter unless otherwise specified.
Target Group
Plant owner
Project Engineer
Installation engineer
Maintenance engineer
How to Use This Manual
Read the user manual and other related documents before any work on the inverter is carried out. Documents shall always be stored
and be available.
The contents of the user 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 the website at
www.sungrowpower.com.
Symbols
Important instructions contained in this user manual should be followed during installation, operation and maintenance of the inverter.
They will be highlighted by the following symbols.
Symbol Explanation
Indicates a hazard with a high level of risk that, if not avoided, will
result in death or serious injury.
Indicates a hazard with a medium level of risk that, if not avoided,
could result in death or serious injury.
Indicates a hazard with a low level of risk that, if not avoided,
could result in minor or moderate injury.
Indicates a situation that, if not avoided, could result in equipment
or property damage.
Indicates additional information, emphasized contents or tips that
may be helpful, e.g. to help you solve problems or save time.
Introduction

1
The safety instructions in this manual cannot cover all the
precautions that should be followed. Perform operations
considering actual onsite conditions.
Sungrow shall not be held liable for any damage caused by
violation of the safety instructions in this manual.
PV strings will produce electrical power when exposed to sunlight and
can cause a lethal voltage and an electric shock.
 Always keep in mind that the inverter is dual power supplied.
Electrical operators must wear proper personal protective
equipment: helmet, insulated footwear, glove, etc.
 Before touching the DC cables, operator must use a measuring device to
ensure that the cable is voltage-free.
 Must follow all warnings on the PV strings and in its manual。
All electrical connections must be in accordance with local and
national standards.
 Only with the permission of the utility grid, the inverter can be
connected to the utility grid.
Danger to life from electric shocks due to live voltage
Do not open the enclosure at any time. Unauthorized opening will
void guarantee and warranty claims and in most cases terminate the
operating license.
The inverter has been designed and tested strictly according to international safety regulations. Read all safety instructions carefully
prior to any work and observe them at all times when working on or with the inverter.
Incorrect operation or work may cause:
injury or death to the operator or a third party; or
damage to the inverter and other property safety of the operator or a third party.
All detailed work-related safety warnings and notes will be specified at critical points in this manual.
1.1 PV Panels
1.2 Utility Grid
Please follow the regulations related to the utility grid.
1.3 I n v e r t e r
1 Safety

2
Risk of inverter damage or personal injury
Do not pull out the PV connectors when the inverter is running.
Wait 5 minutes for the internal capacitors to discharge. Ensure that
there is no voltage or current before pulling any connector.
All safety instructions, warning labels, and nameplate on the inverter:
Must be clearly visible;
Should not be removed or covered.
Risk of burns due to hot components!
Do not touch any hot parts (such as heat sink) during operation. Only
the DC switch can safely be touched at any time.
Only qualified personnel can perform the country setting.
Unauthorized alteration of the country setting may cause a breach of
the type-certificate marking.
Risk of inverter damage due to electrostatic discharge (ESD).
By touching the electronic components, you may damage the inverter.
For inverter handling, be sure to:
Avoid any unnecessary touching;
Wear a grounding wristband before touching any connectors.
User Manual 1 Safety
Warning Label
Label Description
Danger to life due to high voltages!
Only qualified personnel can open and service the
inverter.
Disconnect the inverter from all the external power
sources before service!
5 min
Do not touch live parts until 5minutes after disconnection
from the power sources.
There is a danger from a hot surface that may exceed
60°C.
Check the user manual before service!
1.4 Skills of Qualified Personnel
All installations should be performed by technical personnel. They should have:
Training in the installation and commissioning of the electrical system, as well as the dealing with hazards;
Knowledge of the manual and other related documents.
Knowledge of the local regulations and directives.

3
The inverter follows is compatible with a floating array
configuration and cannot connect to PV strings that are positively
and negatively grounded.
Do not connect any local load between the inverter and the AC
circuit breaker.
2.1 Intended Usage
The SG250HX is a transformer-less three-phase PV grid-connected inverter and is an integral component in the PV power system.
This inverter is designed to convert the direct current power generated from the PV modules into grid-compatible AC current which is
then fed to the utility grid. The intended usage of the inverter is illustrated in Fig. 2-1.
A B C D
Fig. 2-1 Inverter application in PV power system
Item Description Note
A PV strings Monocrystalline silicon, polycrystalline silicon and thin-film modules that are series-
connected without grounding
B Inverter SG250HX; used to convert DC current to AC grid compatible current
C Transformer Required to boost the low voltage from inverter to grid-compatible medium voltage
D Utility grid See Fig. 2-2 for compatible grid types
2 Product Introduction

4
User Manual 2 Product Introduction
TT
Transforme
r
L1
L2
L3
N
L1 L2 L3 PE
Inverter
IT
Transforme
r
L1
L2
L3
L1 L2 L3 PE
Inverter
Make sure the inverter is applied in the IT system before enabling
the Anti-PID function.
SG 250 HX
Code of Product Series
Code Of power level
PV grid-connected inverter
Fig. 2-2 Grid types
2.2 Product Overview
2.2.1 Type Description
The device type description of nomenclature is as follows:
Tab. 2-1 Power Level Description
The device type can be found on the nameplate attached to the side of the inverter. For details, refer to Fig. 3-1Nameplate.
Type Nominal Output Power Nominal Grid Voltage
SG250HX
250 kVA @ 30℃
220 kVA @ 45℃
200 KVA @50℃
3 / PE, 800V
TN-S
Transformer
L1
L2
L3
N
PE
L1 L2 L3 PE
Inverter
TN-C-S
Transformer
L1
L2
L3
N
PE
L1 L2 L3 PE
Inverter
TN-C
Transformer
L1
L2
L3
PEN
L1 L2 L3 PE
Inverter

5
User Manual 2 Product Introduction
Width
Hei
g
ht
Depth
2.2.2 Appearance
6
5
2
3
4
Fig. 2-3 Inverter appearance*
*The image shown here is for reference only. The actual product you receive may differ.
No. Name Description
1 LED indicator Indicates the present working state of the inverter.
2 Label This area contains warning symbols, nameplate, and QR code.
3 Additional grounding terminals Quantity of 2; At least one terminal must be used to ground the inverter.
4 Bottom handle Quantity of 2; Used to physically move the inverter by designated personnel
5 Side handle Quantity of 2; Used to physically move the inverter by designated personnel
6 Mounting ear Quantity of 4: Used to hang the inverter onto the mounting-brackets
7 Wiring area
Designated area for DC switches, AC terminals, DC terminals, and communication terminals.
For details, refer to section 5.1 Terminal Description
2.2.3 Dimensions and Weight
Fig. 2-4 Dimensions of the Inverter
Type Dimensions (Width*Height*Depth) Weight
SG250HX 1051mm * 660mm * 363mm
(41.4”x 26” x 14.3”)
95kg
(209.4lb)
7
1

6
User Manual 2 Product Introduction
2.2.4 LED Indicator Panel
As an HMI, the LED indicator panel on the inverter front panel indicates the present working state of the inverter.
Tab. 2-2 LED indicator description
LED indicator LED state Definition
Steady Blue The device is connected to the grid and
operating normally.
Periodical flashing
blue (Period: 0.2s)
The Bluetooth is connected and there is
data communication. No inverter fault is
present.
Periodical flashing
blue (Period: 2s)
Either the DC or AC side is powered on
and the device is in standby or startup
state (i.e., the inverter is not feeding
power into the gird while DC or AC power
is on).
Steady Red A fault is present and the device
cannot connect to the gird.
Flashing Red
The Bluetooth communication is
connected and there is data
communication. There is a fault that is
present.
OFF Both the AC and DC sides of the inverter
are powered down.
2.2.5 DC Switch
The DC switch is used to disconnect the DC current safely whenever necessary.
Fig. 2-5 Location of DC Switches at Bottom View of the SG250HX

7
User Manual 2 Product Introduction
DC1
L1
L2
DC
12
L3
Current
Monitorin
g
DC switch
DC Bus Inverter Circuit
(
DC/AC
)
PE
AC
Filter
AC SPD
DC SPD
MPPT
(
Boost 12
)
AC EMI
Filter
AC
Relays
MPPT
(
Boost 1
)
DC EMI
Filter
The communication module is a device that collects inverter data
of the PV power plant in real time and realizes remote data
collection and remote O&M functions.
It is recommended to use the communication module produced
by Sungrow, such as Eye, WiFi, or E-Net. A third-party
communication device may cause communication failure or even
unpredictable damage.
2.3 Circuit Diagram
1 2 3
Fig. 2-6 Circuit diagram
1. The MPPT is utilized for DC input to ensure the maximum power from the PV array at different PV input conditions.
2. The internal inverter circuit converts the DC power into AC power.
3. The AC power is fed into the utility grid through the AC terminal. The protection circuit is equipped to ensure the safe operation
of the device and personal safety.
Design principles of the inverters are as follows:
2.4 Function Description
Function Description
Inversion
Function
The inverter converts the DC current into grid-compatible AC current and feeds the AC current into the
grid.
Data Storage The inverter stores historical data such as running information, fault records, etc.
Parameter
Configuration
The inverter provides various parameter settings. These parameters can be set via a smartphone APP to
change the requirements of the device or optimize the performance of the inverter.
Communication
Interface
Standard RS485 port can be connected to monitoring a device and PV system.
Communication accessory port is provided to which communication module can be connected, thereby
achieving the communication function and connecting the monitoring device to the whole PV system.
Protection Function
The protective functions are integrated in the inverter, including anti-island protection, LVRT/ZVRT, DC
reversed polarity protection, AC short circuit protection, leakage current protection, DC
overvoltage/overcurrent protection, etc.

8
User Manual 2 Product Introduction
Inverter
Rise the to-ground electromotive force
at the negative pole of the PV array
Transformer
PV array
Grid
Before enabling the PID recovery function, make sure the to-ground
voltage polarity of the PV panels meets the requirement. If there are
any questions, contact the PV panel manufacturer or refer to its
corresponding user manual.
If the voltage scheme for the PID protection/recovery function does
not meet the requirement of corresponding PV panels, the PID
function will not work as expected or would damage the PV panels.
Make sure the inverter is applied in the IT system before enabling
the anti-PID function.
If the PID recovery function is enabled, it only works at night.
After the PID recovery function is enabled, the voltage of the PV
string to ground is 500Vdc by default, and the default value can
be modified by the APP.
PID function
After the PID function is enabled, the voltage to ground of all PV panels is greater than 0, i.e., the PV panel-to-ground voltage is a
positive value.
−
−Anti-PID function
When the inverter is running, the PID function module rises the potential between the negative pole of the PV array and the ground to a
positive value. When this happens, the PID effect is suppressed.
−PID recovery function
When the inverter is not running, the PID module will apply inverse voltage to PV panels to restore the degraded PV modules.

9
3.1 Unpacking and Inspection
Even though the inverter is thoroughly tested and strictly inspected before delivery, damage may still occur during transit. A thorough
inspection must be conducted after receiving the device, which include the following action items:
Check the packing case for any visible damage.
Check the inner contents for damage after unpacking.
Check the delivery scope for completeness according to the packing list.
Contact SUNGROW or the distributor in case of any damaged or missing components.
It is the best practice to store the inverter in the original packing case, thus, it is strongly recommended that the original packing case is
not disposed.
3.2 Identifying the Inverter
The nameplate can be found on both the inverter and the packing case. It provides information on type of inverter, important
specifications, marks of certification institutions, and serial number which are available and identified by SUNGROW.
1
2
3
4
Fig. 3-1 Nameplate
* The image shown here is for reference only. The actual product you receive may differ.
Item Description
1 SUNGROW logo and product type
2 Technical data of inverter
3 Marks of certification institutions of inverter
3 Unpacking and Storage
型号 Model
序列号 S/N
SG250HX
直流输入DC-Input
最大输入电压 Max. Input Voltage
最小MPP电压 Min. MPP Voltage
最大MPP电压 Max. MPP Voltage
最大输入电流 Max. Input Current
最大短路电流 Isc PV
交流输出AC-Output
额定输出电压 Rated Output Voltage
额定输出频率 Rated Output Frequency
最大输出电流 Max. Output Current
额定输出功率 Rated Output Power
最大视在功率
Max.A
pp
arent Powe
r
DC 1500 V
DC 600 V
DC 1500 V
DC 12*26 A
DC 12*50
A
3/PE AC 800 V
50/60 Hz
AC 180.5 A
225 kW
250 kV
A
功率因数范围 Power Factor Range 0.8 Leading. 0.8 Lagging
安全等级 Safety Class Ⅰ
过压等级 Overvoltage Category ⅠⅡ
[AC],
Ⅱ
[DC]
防护等级 Enclosure
IP66
工作温度范围 Ambient Temperature -30℃ +60℃
阳 光 电 源 股 份 有 限 公 司
SUNGROW POWER SUPPLY CO., LTD.
www.sungrowpower.com 中国制造 Made in China
光伏并网逆变器
GRID-CONNECTED PV INVERTER

User Manual 3 Unpacking and Storage
10
Inverter (x1)
Mounting-bracket (x1)aScrew-in handle (x4)
DC connectors and cord
end terminals (x24)
Four-hole sealing block for
communication terminal (x4)
M10 fastening screw sets (x4)
Screws b
A
llen wrench (x1) Documents c
4 Company name, website and country of manufacture
Tab. 3-1 Description of Icons on theNameplate
Icon Description
Do not dispose of the inverter together with household waste
Refer to the corresponding instructions
TÜV mark of conformity
CGC-SOLAR mark of conformity
CE mark of conformity
3.3 Scope of Delivery
Fig. 3-2 Scope of Delivery
a. The mounting-bracket comprises of two (2) mounting-bracket components and one (1) connecting bar.
b. The screws comprise of two (2) M4×10, two (2) M6×65, and two (2) M6×12 hex socket screws.
c. Documentation include instructions for quick guidance, packing list, warranty card, etc.

User Manual 3 Unpacking and Storage
11
4
3.4 Inverter Storage
If the installation of the inverter is not to take place immediately after receipt, the unit must be properly stored under the guidelines and
conditions as follows:
Use the original packing case with the desiccant inside for storing the inverter.
The packing case must be kept upright.
The storage temperature must be always be maintained between -40°C and +70°C, and the storage relative humidity must
be non-condensing and kept between 0% and 95%.
If the inverter has been stored for more than six months, qualified personnel must thoroughly inspect and test the unit
before using.
In case of stacking storage, the number of stacking layers must never exceed the limit marked on the outer side of the
packing case:

12
Make sure there are no live electrical connections before installation.
To avoid electric shock or other injuries, ensure there are no electric
or plumbing installations before drilling holes.
Risk of injury due to improper handling
Use proper lifting techniques, since weight of unit may cause
injuries.
Always follow the recommended instructions when moving and
positioning the inverter.
System performance loss can occur due to poor ventilation!
Keep the heat sinks uncovered to ensure heat dissipation
performance.
IP66
4.1 Safety During Mounting
4.2 Location Selection
Selecting an optimal location for the inverter is critical to safe operation, long service life, and sound performance.
With ingress of protection IP66, the inverter can be installed both indoors and outdoors.
The inverter should be installed in a place convenient for electrical connection, operation, and maintenance.
4 Mechanical Mounting

User Manual 4 Mechanical Mounting
13
Max.：+60°C
+140℉
Min. ： -30°C
-22℉
Max. RH: 100 %
( non-condensing )
Vertical
Backward
≥10°
Forward Upside down
4.2.1 Installation Environment Requirements
The installation environment is free of inflammable materials.
The inverter should be installed in a place inaccessible to the children.
The ambient temperature and relative humidity must meet the below requirements:
It is recommended that the inverter is protected against direct exposure to sunlight, rain, or snow to ensure longer service life.
The inverter must be mounted in an area with proper ventilation to ensure air circulation.
It is not recommended that the inverter is installed in living areas. The inverter will generate noise during operation, and will
thus affect daily life.
4.2.2 Carrier Requirements
The installation carrier should meet the following requirements:
Made of non-inflammable materials
Max. load bearing capacity ≥4
times of inverter weight
4.2.3 Installation Angle Requirements
The inverter can be installed vertically or at a back tilt to not exceed 80°. Forward installation or upside-down installation is prohibited.
KG

User Manual 4 Mechanical Mounting
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≥ 800mm
/31.5"
≥ 800mm
/31.5"
≥ 800mm
/31.5"
≥ 400mm/
15.7"
≥ 500mm/19.7"
4.2.4 Installation Clearance Requirements
Reserve enough clearance around the inverter to ensure sufficient space for heat dissipation. Please note that the fans are
maintained on the left side of the inverter, and a larger clearance space is required:
≥ 600mm/23.6"
≥ 800mm/31.5"
≥ 400mm/15.7"
≥ 1000mm/39.4"
≥ 450mm/17.7"
For multiple adjacent inverters, reserve specific clearance between the inverters as shown below:
For back-to-back installation of the inverters, reserve specific clearance between
the two inverters.
Install the inverter at an appropriate height for ease of viewing LED indicators and operating switches.