Sungrow SG250HX User manual

SG250HXPV Grid-Connected InverterUser ManualSG250HX–UEN-Ver26-202306
User Manual
PV Grid-Connected Inverter
SG250HX
SG250HX–UEN-Ver26-202306

All Rights Reserved
All Rights Reserved
No part of this document can be reproduced in any form or by any means without the prior
written permission of Sungrow Power Supply Co., Ltd (hereinafter "SUNGROW").
Trademarks
and other Sungrow trademarks used in this manual are owned by SUN
GROW.
All other trademarks or registered trademarks mentioned in this manual are owned by their
respective owners.
Software Licenses
• It is prohibited to use data contained in firmware or software developed by SUNGROW, in
part or in full, for commercial purposes by any means.
• It is prohibited to perform reverse engineering, cracking, or any other operations that com
promise the original program design of the software developed by SUNGROW.
I

About This Manual
The manual mainly contains the product information, as well as guidelines for installation, op
eration, and maintenance. The manual does not include complete information about the pho
tovoltaic (PV) system. Readers can get additional information at www.sungrowpower.com
or on the webpage of the respective component manufacturer.
Validity
This manual is valid for the following model of low-power grid-connected PV string inverters:
• SG250HX
It will be referred to as "inverter" hereinafter unless otherwise specified.
Target Group
This manual is intended for professional technicians who are responsible for installation, op
eration, and maintenance of inverters, and users who need to check inverter parameters.
The inverter must only be installed by professional technicians. The professional technician is
required to meet the following requirements:
• Know electronic, electrical wiring and mechanical expertise, and be familiar with electrical
and mechanical schematics.
• Have received professional training related to the installation and commissioning of elec
trical equipment.
• Be able to quickly respond to hazards or emergencies that occur during installation and
commissioning.
• Be familiar with local standards and relevant safety regulations of electrical systems.
• Read this manual thoroughly and understand the safety instructions related to operations.
How to Use This Manual
Please read this manual carefully before using the product and keep it properly at a place for
easy access.
All contents, pictures, marks, and symbols in this manual are owned by SUNGROW. No part
of this document may be reprinted by the non-internal staff of SUNGROW without written au
thorization.
Contents of this manual may be periodically updated or revised, and the actual product pur
chased shall prevail. Users can obtain the latest manual from support.sungrowpower.com
or sales channels.
Symbols
This manual contains important safety instructions, which are highlighted with the following
symbols, to ensure personal and property safety during usage, or to help optimize the product
performance in an efficient way.
II

Please carefully understand the meaning of these warning symbols to better use the manual.
DANGER
Indicates high-risk potential hazards that, if not avoided, may lead to death or serious
injury.
WARNING
Indicates moderate-risk potential hazards that, if not avoided, may lead to death or
serious injury.
CAUTION
Indicateslow-risk potential hazards that, if not avoided, may lead to minor or moderate
injury.
NOTICE
Indicatespotential risks that, if not avoided, may lead to device malfunctions or finan
cial losses.
“NOTE” indicates additional information, emphasized contents or tips that may be
helpful, e.g., to help you solve problems or save time.
III

Contents
All Rights Reserved............................................................................................................ I
About This Manual............................................................................................................. II
1 Safety Instructions................................................................................................ 1
1.1 Unpacking and Inspection.................................................................................... 2
1.2 Installation Safety................................................................................................. 2
1.3 Electrical Connection Safety.................................................................................3
1.4 Operation Safety...................................................................................................4
1.5 Maintenance Safety.............................................................................................. 5
1.6 Disposal Safety.....................................................................................................6
2 Product Description.............................................................................................. 7
2.1 System Introduction.............................................................................................. 7
2.2 Product Introduction..............................................................................................8
2.3 Symbols on Product........................................................................................... 10
2.4 LED Indicator...................................................................................................... 10
2.5 DC Switch........................................................................................................... 11
2.6 Circuit Diagram................................................................................................... 12
2.7 Function Description........................................................................................... 13
3 Unpacking and Storage.....................................................................................16
3.1 Unpacking and Inspection.................................................................................. 16
3.2 Lieferumfang....................................................................................................... 17
3.3 Inverter Storage.................................................................................................. 17
4 Mechanical Mounting......................................................................................... 19
4.1 Safety During Mounting......................................................................................19
4.2 Location Requirements.......................................................................................20
4.2.1 Environment Requirements...................................................................... 20
4.2.2 Carrier Requirements............................................................................... 21
4.2.3 Angle Requirements................................................................................. 22
4.2.4 Clearance Requirements..........................................................................22
IV

4.3 Installation Tools................................................................................................. 24
4.4 Moving Inverter................................................................................................... 25
4.4.1 Manual Transport..................................................................................... 26
4.4.2 Hoisting Transport.................................................................................... 26
4.5 Installing Mounting-bracket.................................................................................28
4.5.1 PV Bracket-Mounted Installation.............................................................. 28
4.5.2 Wall-Mounted Installation......................................................................... 29
4.6 Installing the Inverter.......................................................................................... 31
5 Electrical Connection......................................................................................... 33
5.1 Safety Instructions.............................................................................................. 33
5.2 Terminal Description...........................................................................................35
5.3 Electrical Connection Overview..........................................................................37
5.4 Crimp OT/DT terminal........................................................................................ 40
5.5 External Protective Grounding Connection........................................................ 41
5.5.1 External Protective Grounding Requirements.......................................... 42
5.5.2 Connection Procedure..............................................................................42
5.6 Opening the Wiring Compartment......................................................................43
5.7 AC Cable Connection.........................................................................................44
5.7.1 AC-Side Requirements.............................................................................44
5.7.2 Requirements for OT/DT Terminal........................................................... 46
5.7.3 Connection Procedure..............................................................................47
5.8 DC Cable Connection.........................................................................................50
5.8.1 PV Input Configuration............................................................................. 51
5.8.2 Y Terminal Connection.............................................................................52
5.8.3 Assembling PV Connectors......................................................................53
5.8.4 Installing PV Connector............................................................................56
5.9 Wiring of Tracking System Power Cable (Optional)...........................................57
5.10 RS485 Connection............................................................................................60
5.10.1 Interface Description...............................................................................60
5.10.2 RS485 Communication System............................................................. 61
5.10.3 Connection Procedure(Terminal Block)..................................................63
5.11 PLC Communication Connection......................................................................65
5.12 Dry Contact Connection................................................................................... 65
5.12.1 Dry Contact Function............................................................................. 65
V

5.12.2 Wiring Procedure....................................................................................67
5.13 Closing the Wiring Compartment..................................................................... 67
6 Commissioning..................................................................................................... 68
6.1 Inspection Before Commissioning...................................................................... 68
6.2 Commissioning Procedure..................................................................................68
7 iSolarCloud App................................................................................................... 70
7.1 Brief Introduction.................................................................................................70
7.2 Installing App...................................................................................................... 70
7.3 Function Overview.............................................................................................. 71
7.4 Login................................................................................................................... 71
7.4.1 Requirements........................................................................................... 71
7.4.2 Login Procedure....................................................................................... 72
7.5 Home.................................................................................................................. 75
7.6 Run Information.................................................................................................. 77
7.7 Records...............................................................................................................78
7.8 More....................................................................................................................81
7.8.1 System Parameters.................................................................................. 81
7.8.2 Operation Parameters.............................................................................. 82
7.8.3 Power Regulation Parameters................................................................. 83
7.8.4 Communication Parameters..................................................................... 87
7.8.5 Firmware Update...................................................................................... 88
7.8.6 Password Changing................................................................................. 89
8 System Decommissioning................................................................................90
8.1 Disconnecting Inverter........................................................................................ 90
8.2 Dismantling the Inverter..................................................................................... 90
8.3 Disposal of Inverter............................................................................................ 91
9 Troubleshooting and Maintenance............................................................... 93
9.1 Troubleshooting.................................................................................................. 93
9.2 Maintenance..................................................................................................... 101
9.2.1 Maintenance Notices.............................................................................. 101
9.2.2 Routine Maintenance..............................................................................102
9.2.3 Cleaning Air Inlet and Outlet.................................................................. 102
9.2.4 Fan Maintenance....................................................................................102
10 Appendix..............................................................................................................105
VI

10.1 Technical Data................................................................................................105
10.2 Wring Distance of DI Dry Contact.................................................................. 106
10.3 Quality Assurance...........................................................................................108
10.4 Contact Information........................................................................................ 108
VII

1 Safety Instructions
When installing, commissioning, operating, and maintaining the product, strictly observe the
labels on the product and the safety requirements in the manual. Incorrect operation or work
may cause:
• Injury or death to the operator or a third party.
• Damage to the product and other properties.
WARNING
• Do not operate the product and cables (including but not limited to moving the
product, installing the product, operating the product and cables, powering up
the product, maintaining the product, and working at heights) in harsh weather
conditions such as flooding, lightning, rain, snow, and level 6 or stronger wind.
• In case of fire, evacuate from the building or product area and call the fire alarm.
Re-entry into the burning area is strictly prohibited under any circumstances.
NOTICE
• Tighten the screws with the specified torque using tools when fastening the prod
uct and terminals. Otherwise, the product may be damaged. And the damage
caused is not covered by the warranty.
• Learn how to use tools correctly before using them to avoid hurting people or
damaging the device.
• Maintain the device with sufficient knowledge of this manual and use proper tools.
• The safety instructions in this manual are only supplements and 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 gen
eral safety operation requirements, general safety standards, or any safety in
struction in this manual.
• When installing, operating, and maintaining the product, comply with local laws
and regulations. The safety precautions in this manual are only supplements to
local laws and regulations.
1

1 Safety Instructions User Manual
1.1 Unpacking and Inspection
WARNING
• Check all safety signs, warning labels and nameplates on devices.
• The safety signs, warning labels and nameplates must be clearly visible and can
not be removed or covered before the device is decommissioned.
NOTICE
After receiving the product, check whether the appearance and structural parts of
the device are damaged, and check whether the packing list is consistent with the
actual ordered product. If there are problems with the above inspection items, do not
install the device and contact your distributor first. If the problem persists, contact
SUNGROW in time.
1.2 Installation Safety
DANGER
• Make sure there is no electrical connection before installation.
• Before drilling, avoid the water and electricity wiring in the wall.
CAUTION
Improper installation may cause personal injury!
• If the product supports hoisting transport and is hoisted by hoisting tools, no one
is allowed to stay under the product.
• When moving the product, be aware of the product weight and keep the balance
to prevent it from tilting or falling.
NOTICE
Before operating the product, must check and ensure that tools to be used have been
maintained regularly.
2

User Manual 1 Safety Instructions
1.3 Electrical Connection Safety
DANGER
• Before electrical connections, please make sure that the inverter is not damaged,
otherwise it may cause danger!
• Before electrical connections, please make sure that the inverter switch and all
switches connected to the inverter are set to "OFF", otherwise electric shock may
occur!
DANGER
The PV string will generate lethal high voltage when exposed to sunlight.
• Operators must wear proper personal protective equipment during electrical con
nections.
• Must ensure that cables are voltage-free with a measuring instrument before
touching DC cables.
• Respect all safety instructions listed in relevant documents about PV strings.
• The inverter must not be connected to a PV string that requires positive or negative
grounding.
DANGER
Danger to life due to a high voltage inside the inverter!
• Be sure to use special insulation tools during cable connections.
• Note and observe the warning labels on the product, and perform operations strict
ly following the safety instructions.
• Respect all safety instructions listed in this manual and other pertinent docu
ments.
WARNING
Damage to the product caused by incorrect wiring is not covered by the warranty.
• Electrical connection must be performed by professionals.
• All cables used in the PV generation system must be firmly attached, properly
insulated, and adequately dimensioned.
3

1 Safety Instructions User Manual
WARNING
• Check the positive and negative polarity of the PV strings, and connect the PV
connectors to corresponding terminals only after ensuring polarity correctness.
• During the installation and operation of the inverter, please ensure that the positive
or negative poles of PV strings do not short-circuit to the ground. Otherwise, an
AC or DC short-circuit may occur, resulting in equipment damage. The damage
caused by this is not covered by the warranty.
NOTICE
Comply with the safety instructions related to PV strings and the regulations related
to the local grid.
1.4 Operation Safety
DANGER
When routing cables, ensure a distance of at least 30 mm between the cables and
heat-generating components or areas to protect the insulation layer of cables from
aging and damage.
DANGER
When the product is working:
• Do not touch the product enclosure.
• It is strictly forbidden to plug and unplug any connector on the inverter.
• Do not touch any wiring terminal of the inverter. Otherwise, electric shock may
occur.
• Do not disassemble any parts of the inverter. Otherwise, electric shock may occur.
• It is strictly forbidden to touch any hot parts of the inverter (such as the heat sink).
Otherwise, it may cause burns.
• Do not connect or remove any PV string or any PV module in a string. Otherwise,
electric shock may occur.
4

User Manual 1 Safety Instructions
1.5 Maintenance Safety
DANGER
Risk of inverter damage or personal injury due to incorrect service!
• Before maintenance, disconnect the AC circuit breaker on the grid side and then
the DC switch. If a fault that may cause personal injury or device damage is found
before maintenance, disconnect the AC circuit breaker and wait until the night be
fore operating the DC switch. Otherwise, a fire inside the product or an explosion
may occur, causing personal injuries.
• After the inverter is powered off for 5 minutes, measure the voltage and current
with professional instrument. Only when there is no voltage nor current can oper
ators who wear protective equipment operate and maintain the inverter.
• Even if the inverter is shut down, it may still be hot and cause burns. Wear protec
tive gloves before operating the inverter after it cools down.
DANGER
Touching the power grid or the contact points and terminals on the inverter connected
to the power grid may lead to electric shock!
• The power grid side may generate voltage. Always use a standard voltmeter to
ensure that there is no voltage before touching.
CAUTION
To prevent misuse or accidents caused by unrelated personnel, post prominent warn
ing signs or demarcate safety warning areas around the product.
NOTICE
To avoid the risk of electric shock, do not perform any other maintenance operations
beyond this manual. If necessary, contact SUNGROW for maintenance. Otherwise, the
losses caused is not covered by the warranty.
5

1 Safety Instructions User Manual
NOTICE
• If the paint on the inverter enclosure falls or rusts, repair it in time. Otherwise, the
inverter performance may be affected.
• Do not use cleaning agents to clean the inverter. Otherwise, the inverter may be
damaged, and the loss caused is not covered by the warranty.
• As the inverter contains no parts that can be maintained, never open the enclosure
of the inverter or replace any internal components without authorization. Other
wise, the loss caused is not covered by the warranty.
1.6 Disposal Safety
WARNING
Please scrap the product in accordance with relevant local regulations and standards
to avoid property losses or casualties.
6

2 Product Description
2.1 System Introduction
The inverter is a transformerless 3-phase PV grid-connected inverter. As an integral compo
nent in the PV power system, the inverter is designed to convert the direct current power gen
erated from the PV modules into grid-compatible AC current and to feed the AC current into
the utility grid.
The intended usage of the inverter is illustrated in the following figure.
figure 2-1 Inverter Application in PV Power System
WARNING
The inverter must not be connected to a PV string that requires positive or negative
grounding.
Do not connect any local load between the inverter and the AC circuit breaker except
for the tracking axis.
NOTICE
When designing the system, ensure that the operating ranges of all devices that are
connected to the inverter meet the requirements of the inverter.
The PV modules in the system must comply with the IEC 61730-1 (2016) class Ⅱ stan
dard.
The inverter is only applicable to the scenarios described in the manual and cannot
be used in other situations.
Item Description Note
A PV strings Monocrystalline silicon, polycrystalline silicon and thin-film with
out grounding.
B Inverter SG250HX
C Transformer Boost the low voltage from the inverter to grid-compatible medi
um voltage.
7

2 Product Description User Manual
Item Description Note
D Utility grid IT
The following figure shows the common grid configurations.
2.2 Product Introduction
Model Description
The model description is as follows :
Appearance
The following figure shows the dimensions of the inverter. The image shown here is for refer
ence only. The actual product received may differ.
8

User Manual 2 Product Description
figure 2-2 Inverter Appearance
No. Name Description
1 LED indicator To indicate the current working state of the inverter.
2 Labels Warning symbols, nameplate, and QR code.
3
External protective
grounding termi
nals
2, use to ground the inverter.
4 Bottom handles 2, used to move the inverter.
5 Side handles 2, used to move the inverter.
6 Mounting lugs 4, used to hang the inverter onto the mounting-bracket.
7 DC Switch To safely disconnect the DC circuit whenever necessary.
8 Wiring area DC terminals, and communication terminals.
For details, refer to “Terminal Description”
Dimensions
The following figure shows the dimensions of the inverter.
figure 2-3 Product Dimensions(in mm)
Model Dimensions (W*H*D) Weight (kg)
SG250HX 1051*660*363 mm 99 kg
*The image shown here is for reference only. The actual product you receive may differ.
9

2 Product Description User Manual
2.3 Symbols on Product
Symbol Explanation
Do not dispose of the inverter together with household waste.
TÜV mark of conformity.
CE mark of conformity.
EU/EEA Importer.
UKCA mark of conformity.
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 main
tenance!
Burn danger due to the hot surface that may exceed 60°C.
Do not touch live parts for 5 minutes after disconnection from the power
sources.
Read the user manual before maintenance!
* The table shown here is for reference only. The actual product received may differ.
2.4 LED Indicator
The LED indicator on the front of the inverter indicates the working state of the inverter.
10

User Manual 2 Product Description
table 2-1 LED Indicator State Description
LED Color State Definition
On The device is connected to the grid and operating nor
mally.
Fast blink
(Period: 0.2s)
The Bluetooth connection is established, and there is
data communication.
No system fault occurs.
Slow blink
(Period: 2s) The device is in standby or startup state (not feeding
power into the grid).
Blue Slow blink
once, fast
blink three
times
The inverter is performing PID recovery.
On A fault occurs and the device cannot connect to the grid.
Red
Blink The Bluetooth connection is established, data commu
nication in process, and a system fault occurs.
Gray
OFF Both the AC and DC sides are powered down.
WARNING
Voltage may still be present in AC side circuits after the indicator is off. Pay attention
to the electricity safety when operating.
2.5 DC Switch
The inverter is equipped with four DC switches which can safely disconnect it from PV strings.
Each switch controls the circuits corresponding to DC terminals in the area where the switch
is located.
11