MBMap Registry
  1. Devices
  2. Sungrow
  3. SG string inverters (RT / CX)

Sungrow SG string inverters (RT / CX) Modbus register map

Also covers SG100CX / SG100CX-JP, SG10RT, SG10RT-P2, SG110CX, SG110CX-P2, SG125CX-P2, SG12RT, SG12RT-P2, SG15RT, SG15RT-P2, SG17RT, SG17RT-P2, SG20RT, SG20RT-P2, SG22RT, SG23RT, SG23RT-P2, SG25CX-P2, SG25CX-SA, SG25RT, SG25RT-P2, SG3.0RT, SG3.0RT-P2, SG30CX, SG30CX-P2, SG33CX, SG33CX-P2, SG36CX-P2, SG36CX-US, SG4.0RT, SG4.0RT-P2, SG40CX, SG40CX-P2, SG49.5CX-JP, SG5.0RT, SG5.0RT-P2, SG50CX, SG50CX-P2, SG6.0RT, SG6.0RT-P2, SG60CX-US, SG7.0RT, SG7.0RT-P2, SG75CX, SG75CX-P2, SG8.0RT, SG8.0RT-P2

Three-phase and single-phase PV string inverters, SG RT and SG CX series (and P2 variants)

  • Official
  • 98 registers
  • Modbus TCP and RTU
  • Revision 1 · 2026-11-10
  • Identity: model, firmware, serial number

Official: Written from the manufacturer's documentation, but not tested on a device yet. Check the map against the manufacturer's documentation before you write to a live device. Tested it? Report a test.

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Communication

Protocol
Modbus TCP and RTU
Unit ID
1
TCP port
502
Serial
9600 8N1 · 9600 baud, 8 data bits, none parity, 1 stop bit
Byte / word order
CDAB · bytes big-endian, words low first (word swap)
Addresses
1-based · wire address = address − 1

Connection values are defaults: the device may be configured differently.

Map

Registers
16 holding registers, 82 input registers
Groups
8
Revision
1 · 2026-11-10
Added
()
File
maps/sungrow/sg-string.mbmap.json · 24 KB · history
SHA-256
9ffa85c002c9c43dea1ca833c142a2311cde45e80bf4b1def1bfd201799b2081
Manufacturer
sungrowpower.com

Device identity

What a tool can read to check that this map fits the connected device (SPEC.md section 4.7). Registers with a role are read like any other register.

Registers
RoleRegisterAddressTypeValues
Firmware ARM software version input 4954 string[15]
Serial number Serial number input 4990 string[10]
Model Device type code input 5000 uint16 0x2430 = SG5.0RT, 0x2431 = SG6.0RT, 0x2432 = SG8.0RT, +44 more

Sources and notes

Source: Sungrow, Communication Protocol of PV Grid-Connected String Inverters V1.1.53 (TI_20230117)

  • Addresses are the protocol addresses of the manual; the wire address is one less (address_base 1).
  • Read-only data are input registers (FC04); settings are holding registers (FC03/06/16). Input 5000 and holding 5000 are different registers.
  • 32-bit values are sent low word first.
  • A register the model does not have returns 0xFFFF (16-bit) or 0xFFFFFFFF (32-bit).
  • Only the registers common to the RT and CX series are listed. Meter, MPPT 13-16, strings 25-32, fault time, country, curve and dispatch registers are not included.
  • Which MPPT inputs and strings exist, and the setting ranges, depend on the model (appendix 5 of the manual).
AreaAddressNameTypeAccessUnitScaleDescription
IR 4950 uint32 CDAB R
IR 4952 uint32 CDAB R
IR 4954 string[15] R
IR 4969 string[15] R
IR 4990 string[10] R
IR 5000 uint16 R Model code from the protocol's device table
IR 5001 uint16 R kW ×0.1
IR 5002 uint16 R Tells whether registers 5019-5021 hold phase voltages (1) or line voltages (2)
IR 5003 uint16 R kWh ×0.1
IR 5004 uint32 CDAB R kWh Whole kWh; 5144 has 0.1 kWh resolution on newer models
IR 5006 uint32 CDAB R h
IR 5008 int16 R °C ×0.1
IR 5009 uint32 CDAB R VA Only on models that support it; 0xFFFFFFFF otherwise
IR 5011 uint16 R V ×0.1
IR 5012 uint16 R A ×0.1
IR 5013 uint16 R V ×0.1 0xFFFF when the model has no such input
IR 5014 uint16 R A ×0.1
IR 5015 uint16 R V ×0.1 0xFFFF when the model has no such input
IR 5016 uint16 R A ×0.1
IR 5115 uint16 R V ×0.1 0xFFFF when the model has no such input
IR 5116 uint16 R A ×0.1
IR 5117 uint16 R V ×0.1 0xFFFF when the model has no such input
IR 5118 uint16 R A ×0.1
IR 5119 uint16 R V ×0.1 0xFFFF when the model has no such input
IR 5120 uint16 R A ×0.1
IR 5121 uint16 R V ×0.1 0xFFFF when the model has no such input
IR 5122 uint16 R A ×0.1
IR 5123 uint16 R V ×0.1 0xFFFF when the model has no such input
IR 5124 uint16 R A ×0.1
IR 5130 uint16 R V ×0.1 0xFFFF when the model has no such input
IR 5131 uint16 R A ×0.1
IR 5132 uint16 R V ×0.1 0xFFFF when the model has no such input
IR 5133 uint16 R A ×0.1
IR 5134 uint16 R V ×0.1 0xFFFF when the model has no such input
IR 5135 uint16 R A ×0.1
IR 5136 uint16 R V ×0.1 0xFFFF when the model has no such input
IR 5137 uint16 R A ×0.1
IR 5017 uint32 CDAB R W
IR 5019 uint16 R V ×0.1 Phase voltage or line voltage, depending on output type (5002)
IR 5020 uint16 R V ×0.1 Phase voltage or line voltage, depending on output type (5002)
IR 5021 uint16 R V ×0.1 Phase voltage or line voltage, depending on output type (5002)
IR 5022 uint16 R A ×0.1
IR 5023 uint16 R A ×0.1
IR 5024 uint16 R A ×0.1
IR 5031 uint32 CDAB R W
IR 5033 int32 CDAB R var
IR 5035 int16 R ×0.001 Positive leading, negative lagging
IR 5036 uint16 R Hz ×0.1 Older models; RT and newer models use 5148 with finer resolution
IR 5038 uint16 R
IR 5045 uint16 R Valid only while the work state is Fault or Alarm run; code list is in the manufacturer's appendix
IR 5049 uint16 R kvar ×0.1
IR 5071 uint16 R kΩ 0xFFFF means invalid
IR 5113 uint16 R min
IR 5128 uint32 CDAB R kWh ×0.1
IR 5144 uint32 CDAB R kWh ×0.1 RT series and some other models
IR 5146 int16 R V ×0.1
IR 5147 uint16 R V ×0.1
IR 5148 uint16 R Hz ×0.01 RT series and some other models
IR 7013 uint16 R A ×0.01 Available only if the hardware reports string currents; the number of strings depends on the model
IR 7014 uint16 R A ×0.01
IR 7015 uint16 R A ×0.01
IR 7016 uint16 R A ×0.01
IR 7017 uint16 R A ×0.01
IR 7018 uint16 R A ×0.01
IR 7019 uint16 R A ×0.01
IR 7020 uint16 R A ×0.01
IR 7021 uint16 R A ×0.01
IR 7022 uint16 R A ×0.01
IR 7023 uint16 R A ×0.01
IR 7024 uint16 R A ×0.01
IR 7025 uint16 R A ×0.01
IR 7026 uint16 R A ×0.01
IR 7027 uint16 R A ×0.01
IR 7028 uint16 R A ×0.01
IR 7029 uint16 R A ×0.01
IR 7030 uint16 R A ×0.01
IR 7031 uint16 R A ×0.01
IR 7032 uint16 R A ×0.01
IR 7033 uint16 R A ×0.01
IR 7034 uint16 R A ×0.01
IR 7035 uint16 R A ×0.01
IR 7036 uint16 R A ×0.01
HR 5000 uint16 RW
HR 5001 uint16 RW
HR 5002 uint16 RW
HR 5003 uint16 RW
HR 5004 uint16 RW
HR 5005 uint16 RW
HR 5006 uint16 RW
HR 5007 uint16 RW
HR 5008 uint16 RW % ×0.1 Percent of nominal power; used when the limitation switch is enabled; range depends on the model
HR 5016 uint16 RW kW ×0.01
HR 5019 int16 RW ×0.001 Range -1.000 to -0.800 or 0.800 to 1.000; used when reactive mode (5036) is 0xA1
HR 5020 uint16 RW
HR 5036 uint16 RW
HR 5037 int16 RW % ×0.1 -100.0 to 100.0; used when reactive mode is 0xA2
HR 5039 uint16 RW kW ×0.1 Power limit in kW; range depends on the model
HR 5040 int16 RW kvar ×0.1 Reactive power in kvar; range depends on the model

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