Sungrow SG250HX-US User manual

SSGG225500HHXX--UUSSPPVV GGrriidd--CCoonnnneecctteedd
IInnvveerrtteerrUUsseerr MMaannuuaallSSGG225500HHXX--
UUSS--UUEENN--VVeerr1122--220022000088
SG250HX-US-UEN-Ver12-202008
SG250HX-US
PPVV GGrriidd--CCoonnnneecctteedd IInnvveerrtteerr
UUsseerr MMaannuuaall

I
All Rights Reserved
AAllll RRiigghhttss RReesseerrvveedd
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").
TTrraaddeemmaarrkkss
and other Sungrow trademarks used in this manual are owned by
Sungrow Power Supply Co., Ltd.
All other trademarks or registered trademarks mentioned in this document are owned
by their respective owners.
SSooffttwwaarree LLiicceennsseess
•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
compromise the original program design of the software developed by SUNGROW.
Sungrow Power Supply Co., Ltd.
Address: NNoo..11669999 XXiiyyoouu RRdd..,, NNeeww && HHiigghh TTeecchh ZZoonnee,, HHeeffeeii,, 223300008888,, CChhiinnaa..
Email: iinnffoo@@ssuunnggrrooww..ccnn
Tel: [phone]
Website: wwwwww..ssuunnggrroowwppoowweerr..ccoomm

II
About This Manual
The manual mainly describes the product information, guidelines for installation,
operation and maintenance. The manual cannot include complete information about the
photovoltaic (PV) system. You can get additional information about other devices at
wwwwww.. ssuunnggrroowwppoowweerr.. ccoomm or on the webpage of the respective component
manufacturer.
VVaalliiddiittyy
This manual is valid for the following inverter types:
•SG250HX-US
They will be referred to as “inverter” hereinafter unless otherwise specified.
TTaarrggeett GGrroouupp
This manual is intended for:
•qualified personnel who are responsible for the installation and commissioning of the
inverter; and
•inverter owners who will have the ability to interact with the inverter.
HHooww ttoo UUssee TThhiiss MMaannuuaall
Read the manual and other related documents before performing any work on the
inverter is carried out. Documents must be stored carefully and be available at all times.
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 the subsequent inverter
edition. The latest manual can be acquired via visiting the website at wwwwww..
ssuunnggrroowwppoowweerr..ccoomm.
SSyymmbboollss
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.
SSyymmbbooll EExxppllaannaattiioonn
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.

III
SSyymmbbooll EExxppllaannaattiioonn
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.

V
CCoonntteennttss
All Rights Reserved.....................................................................................................I
About This Manual.....................................................................................................II
1 Safety .............................................................................................................. 1
1.1 PV Panels..................................................................................................... 1
1.2 Utility Grid .................................................................................................... 1
1.3 Inverter ........................................................................................................ 2
1.4 Skills of Qualified Personnel.......................................................................... 3
2 Product Introduction ................................................................................... 4
2.1 Intended Usage............................................................................................ 4
2.2 Product Introduction..................................................................................... 6
2.2.1 Model Description............................................................................... 6
2.2.2 Appearance........................................................................................ 7
2.2.3 Dimensions ........................................................................................ 7
2.2.4 LED Indicator Panel ............................................................................ 8
2.2.5 DC Switch........................................................................................... 8
2.3 Circuit Diagram ............................................................................................ 9
2.4 Function Description .................................................................................... 9
3 Unpacking and Storage ........................................................................... 12
3.1 Unpacking and Inspection.......................................................................... 12
3.2 Identifying the Inverter................................................................................ 12
3.3 Scope of Delivery....................................................................................... 14
3.4 Inverter Storage ......................................................................................... 14
4 Mechanical Mounting .............................................................................. 16
4.1 Safety during Mounting .............................................................................. 16
4.2 Location Requirements .............................................................................. 16
4.2.1 Installation Environment Requirements ............................................. 16
4.2.2 Carrier Requirements........................................................................ 17
4.2.3 Installation Angle Requirements ........................................................ 17
4.2.4 Installation Clearance Requirements ................................................. 17
4.3 Installation Tools......................................................................................... 19
4.4 Moving the Inverter .................................................................................... 20

VI
4.4.1 Manual Transport ............................................................................. 20
4.4.2 Hoisting Transport ............................................................................ 20
4.5 Dimensions of mounting-bracket................................................................ 21
4.6 PV Bracket-Mounted Installation................................................................. 22
4.6.1 Preparation before Mounting ............................................................ 22
4.6.2 Mounting Steps ................................................................................ 22
4.7 Wall-Mounted Installation........................................................................... 24
4.7.1 Preparation before Mounting ............................................................ 24
4.7.2 Mounting Steps ................................................................................ 24
5 Electrical Connection ............................................................................... 27
5.1 Safety Instructions...................................................................................... 27
5.2 Terminal Description................................................................................... 27
5.3 Electrical Connection Overview .................................................................. 29
5.4 Additional Grounding Connection ............................................................... 31
5.4.1 Additional Grounding Requirements.................................................. 31
5.4.2 Connection Procedure...................................................................... 31
5.5 Opening the Wiring Compartment .............................................................. 32
5.6 AC Cable Connection ................................................................................. 33
5.6.1 AC Side Requirements...................................................................... 33
5.6.2 Requirements for OT/DT Terminal ..................................................... 35
5.6.3 Aluminium Cable Requirements ........................................................ 36
5.6.4 Connection Procedure...................................................................... 36
5.7 DC Cable Connection................................................................................. 39
5.7.1 PV Input Configuration...................................................................... 39
5.7.2 Connection Procedure...................................................................... 40
5.7.3 Installing the PV Connectors ............................................................. 42
5.8 Energy Storage Cable Connection.............................................................. 43
5.8.1 Overview .......................................................................................... 43
5.8.2 Wiring Procedure.............................................................................. 43
5.9 Wiring of Tracking System Power Cable (Optional) ..................................... 45
5.10 RS485 Communication ............................................................................ 48
5.10.1 Interface Description ...................................................................... 48
5.10.2 RS485 Communication System ...................................................... 49
5.10.3 Connection Procedure(Terminal Block) ........................................... 51
5.11 CAN Commuication.................................................................................. 52
5.11.1 Interface Instruction........................................................................ 52
5.11.2 Wiring Procedure............................................................................ 53

VII
5.12 PLC Communication Connection.............................................................. 53
5.13 Dry Contact Connection ........................................................................... 53
5.13.1 Dry Contact Function...................................................................... 54
5.13.2 Wiring Procedure............................................................................ 56
5.14 Closing the Wiring Compartment .............................................................. 56
6 Commissioning ........................................................................................... 58
6.1 Inspection before Commissioning............................................................... 58
6.2 Commissioning Procedure ......................................................................... 58
7 iSolarCloud App .......................................................................................... 59
7.1 Brief Introduction........................................................................................ 59
7.2 Download and Install .................................................................................. 59
7.3 Function Overview ..................................................................................... 60
7.4 Login.......................................................................................................... 60
7.4.1 Requirements................................................................................... 60
7.4.2 Login Steps ...................................................................................... 60
7.5 Home page................................................................................................ 62
7.6 Running Information................................................................................... 64
7.7 History Record ........................................................................................... 66
7.7.1 Fault Alarm Records ......................................................................... 67
7.7.2 Power Yields Records....................................................................... 68
7.7.3 Event Records.................................................................................. 69
7.8 More.......................................................................................................... 69
7.8.1 Parameter Setting............................................................................. 70
7.8.2 Firmware Update.............................................................................. 77
7.8.3 Password Changing ......................................................................... 77
8 System Decommissioning ...................................................................... 79
8.1 Disconnecting the Inverter.......................................................................... 79
8.2 Dismantling the Inverter.............................................................................. 79
8.3 Disposal of the Inverter............................................................................... 80
9 Troubleshooting and Maintenance ...................................................... 81
9.1 Troubleshooting ......................................................................................... 81
9.2 Maintenance.............................................................................................. 91
9.2.1 Routine Maintenance........................................................................ 92
9.2.2 Maintenance Instruction ................................................................... 92
10 Appendix .................................................................................................... 95
10.1 Technical Data ......................................................................................... 95

VIII
10.2 Wring Distance of DI Dry Contact ............................................................. 97
10.3 Quality Assurance .................................................................................... 98
10.4 Contact Information ................................................................................. 99

1
1Safety
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.
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.
1.1 PV Panels
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.
•Follow all warnings on the PV strings and in its manual.
1.2 Utility Grid
Please follow the regulations related to the utility grid.

2
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.
1.3 Inverter
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.
Risk of inverter damage or personal injury
•Do not pull out the PV connectors when the inverter is running.
•Wait at least 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 legible.
•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.
1 Safety User Manual

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Only qualified personnel can perform the country setting.
•Unauthorized alteration of the country setting may cause a breach of the
type-certificate marking.
By touching the electronic components, you may damage the inverter. For
inverter handling, be sure to:
•avoid any unnecessary touching;and,
•wear a grounding wristband before touching any connectors.
WWaarrnniinngg LLaabbeell
LLaabbeell DDeessccrriippttiioonn
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!
Do not touch live parts until 5 minutes 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 qualified 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
User Manual 1 Safety

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2Product Introduction
2.1 Intended Usage
SG250HX-US, a transformerless three-phase PV grid-connected inverter, is an integral
component in the PV power system.
The inverter is designed to convert the direct current power generated from the PV
modules into grid-compatible AC current and feeds the AC current to the utility grid. The
intended usage of the inverter is illustrated in "Figure 2-2 Inverter application in PV and
energy storage hybrid systems".
FFiigguurree 22--11 Inverter application in PV power system
The inverter is also equipped with an energy storage interface, which can be connected
to an energy storage battery through a DC converter to convert the DC power from the
battery into AC power that meets the grid requirements and feeds it into the grid. The
intended usage of inverters in PV and energy storage hybrid systems is illustrated in "-
Figure 2-2 Inverter application in PV and energy storage hybrid systems"

5
FFiigguurree 22--22 Inverter application in PV and energy storage hybrid systems
Inverter cannot connect the PV strings whose positive and negative terminals
need to be grounded.
Do not connect any local load between the inverter and the AC circuit breaker.
IItteemm DDeessccrriippttiioonn NNoottee
APV strings Monocrystalline silicon, polycrystalline silicon and thin-
film without grounding.
B Inverter SG250HX-US
C Transformer Boost the low voltage from inverter to grid-compatible
medium voltage.
DUtility grid TN-C, TN-S, TN-C-S, TT, IT.
EStorage
batteries
When the power is sufficient, the inverter is supplied with
electric energy and discharged. When the power is
insufficient, the inverter obtains electric energy from the
inverter and charges it.
FDC/DC
converter Stabilize the DC output from the battery.
User Manual 2 Product Introduction

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Make sure the inverter is applied to an IT system before enabling the Anti-PID
function.
2.2 Product Introduction
2.2.1 Model Description
The device model description is as follows:
MMooddeell NNoommiinnaall OOuuttppuutt
PPoowweerr NNoommiinnaall GGrriidd VVoollttaaggee
SG250HX-US
250 kVA @ 30 ℃ /
225 kVA @ 40 ℃ /
200 KVA @ 50 ℃
3 / PE, 800 V
The device model can be found on the nameplate attached to the side of the inverter.
For details, refer to "3.2 Identifying the Inverter".
2 Product Introduction User Manual

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2.2.2 Appearance
*The image shown here is for reference only. The actual product you receive may differ.
NNoo.. NNaammee DDeessccrriippttiioonn
1 LED indicator
panel
HMI interface to indicate the present working state of
the inverter.
2 Labels Warning symbols, nameplate, and QR code.
3 Additional
grounding
terminals
2, use at least one of them to ground the inverter.
4 Bottom handles 2, used to move the inverter.
5Side handles 2, used to move the inverter.
6 Mounting ears 4, used to hang the inverter onto the mounting-bracket.
7Wiring area
DC switches, AC terminals, DC terminals, and
communication terminals.
For details, refer to "5.2 Terminal Description".
2.2.3 Dimensions
FFiigguurree 22--33 Dimensions of the Inverter
*The image shown here is for reference only. The actual product you receive may differ.
User Manual 2 Product Introduction

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TTyyppee DDiimmeennssiioonnss ((WW**HH**DD)) WWeeiigghhtt
SG250HX-
US
1051*660*363mm
( 41.4''*26''*14.3'')
99kg (218.3 lb)
2.2.4 LED Indicator Panel
As an HMI, the LED indicator panel on the front of the inverter can indicate the present
working state of the inverter.
Table 2-1 LED indicator description
LLEEDD
iinnddiiccaattoorr LLEEDD ssttaattee DDeeffiinniittiioonn
Blue
ON The device is connected to the grid and operating
normally.
Fast blink
(Period: 0.2s)
The Bluetooth communication is connected and
there is data communication.
No system fault occurs.
Slow flash
(Period: 2s) The device is in standby or startup state (not
feeding power into the grid).
Red
ON A fault occurs and the device cannot connect to
the grid
Twinkling
The Bluetooth communication is connected and
there is data communication.
System fault occurs.
OFF
OFF Both the AC and DC sides are powered down.
2.2.5 DC Switch
The DC switch is used to disconnect the DC current safely whenever necessary.
The inverter is equipped with four DC switches, each DC switch controls its
corresponding DC terminals.
2 Product Introduction User Manual

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Turn the DC switches to the ON position before restarting the inverter.
2.3 Circuit Diagram
The MPPT is utilized for DC input to ensure the maximum power from the PV array at
different PV input conditions. The inversion circuit converts the DC power into AC power
and feeds the AC power into the utility grid through the AC terminal. The protection
circuit is equipped to ensure the safe operation of the device and personal safety.
The following figure shows the main circuit of the inverter.
FFiigguurree 22--44 Circuit diagram
2.4 Function Description
The inverter is equipped with the following functions:
CCoonnvveerrssiioonn ffuunnccttiioonn
The inverter converts the DC current into grid-compatible AC power and provide it to
local loads or export it into the grid.
DDaattaa ssttoorraaggee
The inverter logs running information, error records, etc.
PPaarraammeetteerr ccoonnffiigguurraattiioonn
The inverter provides various settable parameters. Users can set parameters via the
App to meet the requirements and optimize the performance.
CCoommmmuunniiccaattiioonn iinntteerrffaaccee
The inverter is designed with standard RS485 communication interfaces.
User Manual 2 Product Introduction

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The standard RS485 communication interfaces are used to establish communication
connection with monitoring devices and upload monitoring data by using
communication cables.
After communication connection is established, users can view inverter information or
set inverter parameters in a certain remote online portal.
PPrrootteeccttiioonn FFuunnccttiioonn
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.
PPIIDD ffuunnccttiioonn
After the PID function is enabled, the voltage to ground of all PV modules is greater than
0, that is, the PV module-to-ground voltage is a positive value.
•Before enabling the PID recovery function, make sure the voltage polarity of
the PV modules to ground meets requirement. If there are any questions,
contact the PV module manufacturer or read its corresponding user manual.
•If the voltage scheme for the PID protection/recovery function does not meet
the requirement of corresponding PV modules, the PID function will not work
as expected or even damage the PV modules.
•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, to suppress the PID
effect.
Make sure the inverter is applied to an IT system before enabling the anti-PID
function.
•PID recovery function
When the inverter is not running, the PID module will apply inverse voltage to PV
modules, to restore the degraded modules.
2 Product Introduction User Manual