103 (integer, scale factors) Modbus register map

Generic SunSpec Modbus inverter model with integer values with scale factor registers. Used by many inverters (SolarEdge, Fronius, SMA, Kostal and others); the model and its position are set by each device

Official
69 registers
Modbus TCP and RTU
Revision 2 · 2026-11-10
Identity: 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.

Download .mbmap.json Raw JSON View on GitHub Suggest a correction Report a problem

Communication

Protocol: Modbus TCP and RTU
Unit ID: 1
TCP port: 502
Serial: 9600 8E1 · 9600 baud, 8 data bits, even parity, 1 stop bit defaults
Byte / word order: ABCD · bytes big-endian, words high first
Addresses: 0-based

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

Map

Registers: 69 holding registers
Groups: 9
Translation tables: 1
Revision: 2 · 2026-11-10
Added: 2026-10-14 (2026-10-14)
File: maps/sunspec-alliance/inverter-101-103.mbmap.json · 14 KB · history
SHA-256: e66d4c126183abde42b7e597de0e65be190099555697de1188e78edb5cf22c85
Manufacturer: sunspec.org

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
Role	Register	Address	Type	Values
Firmware	Version	holding 40044	string[8]
Serial number	Serial number	holding 40052	string[16]

Sources and notes

SunSpec Alliance information model definitions
models 1, 101-103

Source: SunSpec Alliance, SunSpec information model definitions (github.com/sunspec/models), models 1, 101-103

SunSpec Inverter 101/102/103 (integer, scale factors).
The SunSpec chain starts at address 40000 ('SunS'), then the common block, then the inverter model.
This map assumes a common block of 65 registers, so the inverter model starts at 40069 (as in SolarEdge inverters). A device with the 66-register common block of the specification starts it at 40070: read the Model ID row, which must show 101-103 or 111-113, to check.

Area	Address	Type	Access	Unit	Scale	Description
HR	40000	string[2]	R			Reads SunS" on a SunSpec device"
HR	40002	uint16	R			SunSpec ID
HR	40003	uint16	R			SunSpec L
HR	40004	string[16]	R			SunSpec Mn
HR	40020	string[16]	R			SunSpec Md
HR	40036	string[8]	R			SunSpec Opt
HR	40044	string[8]	R			SunSpec Vr
HR	40052	string[16]	R			SunSpec SN
HR	40068	uint16	R			SunSpec DA. This point is mandatory for all SunSpec RTU devices and, for those devices, they must support values from 1-247.
HR	40069	uint16	R			SunSpec ID. 101/111 = single phase, 102/112 = split phase, 103/113 = three phase
HR	40070	uint16	R			SunSpec L
HR	40071	uint16	R	A	×10^A_SF	SunSpec A. Sum of active phases
HR	40072	uint16	R	A	×10^A_SF	SunSpec AphA. Connected Phase
HR	40073	uint16	R	A	×10^A_SF	SunSpec AphB. Connected Phase
HR	40074	uint16	R	A	×10^A_SF	SunSpec AphC. Connected Phase
HR	40075	int16	R			SunSpec A_SF
HR	40076	uint16	R	V	×10^V_SF	SunSpec PPVphAB
HR	40077	uint16	R	V	×10^V_SF	SunSpec PPVphBC
HR	40078	uint16	R	V	×10^V_SF	SunSpec PPVphCA
HR	40079	uint16	R	V	×10^V_SF	SunSpec PhVphA
HR	40080	uint16	R	V	×10^V_SF	SunSpec PhVphB
HR	40081	uint16	R	V	×10^V_SF	SunSpec PhVphC
HR	40082	int16	R			SunSpec V_SF
HR	40083	int16	R	W	×10^W_SF	SunSpec W
HR	40084	int16	R			SunSpec W_SF
HR	40085	uint16	R	Hz	×10^Hz_SF	SunSpec Hz
HR	40086	int16	R			SunSpec Hz_SF
HR	40087	int16	R	VA	×10^VA_SF	SunSpec VA
HR	40088	int16	R			SunSpec VA_SF
HR	40089	int16	R	var	×10^VAr_SF	SunSpec VAr
HR	40090	int16	R			SunSpec VAr_SF
HR	40091	int16	R	%	×10^PF_SF	SunSpec PF
HR	40092	int16	R			SunSpec PF_SF
HR	40093	uint32 ABCD	R	Wh	×10^WH_SF	SunSpec WH
HR	40095	int16	R			SunSpec WH_SF
HR	40096	uint16	R	A	×10^DCA_SF	SunSpec DCA
HR	40097	int16	R			SunSpec DCA_SF
HR	40098	uint16	R	V	×10^DCV_SF	SunSpec DCV
HR	40099	int16	R			SunSpec DCV_SF
HR	40100	int16	R	W	×10^DCW_SF	SunSpec DCW
HR	40101	int16	R			SunSpec DCW_SF
HR	40102	int16	R	°C	×10^Tmp_SF	SunSpec TmpCab
HR	40103	int16	R	°C	×10^Tmp_SF	SunSpec TmpSnk
HR	40104	int16	R	°C	×10^Tmp_SF	SunSpec TmpTrns
HR	40105	int16	R	°C	×10^Tmp_SF	SunSpec TmpOt
HR	40106	int16	R			SunSpec Tmp_SF
HR	40107	uint16	R			SunSpec St
HR	40108	uint16	R			SunSpec StVnd
HR	40110	bool bit 0	R			SunSpec Evt1 bit 0
HR	40110	bool bit 1	R			SunSpec Evt1 bit 1
HR	40110	bool bit 2	R			SunSpec Evt1 bit 2
HR	40110	bool bit 3	R			SunSpec Evt1 bit 3
HR	40110	bool bit 4	R			SunSpec Evt1 bit 4
HR	40110	bool bit 5	R			SunSpec Evt1 bit 5
HR	40110	bool bit 6	R			SunSpec Evt1 bit 6
HR	40110	bool bit 7	R			SunSpec Evt1 bit 7
HR	40110	bool bit 8	R			SunSpec Evt1 bit 8
HR	40110	bool bit 9	R			SunSpec Evt1 bit 9
HR	40110	bool bit 10	R			SunSpec Evt1 bit 10
HR	40110	bool bit 11	R			SunSpec Evt1 bit 11
HR	40110	bool bit 12	R			SunSpec Evt1 bit 12
HR	40110	bool bit 13	R			SunSpec Evt1 bit 13
HR	40110	bool bit 14	R			SunSpec Evt1 bit 14
HR	40110	bool bit 15	R			SunSpec Evt1 bit 15
HR	40111	uint32 ABCD	R			SunSpec Evt2
HR	40113	uint32 ABCD	R			SunSpec EvtVnd1
HR	40115	uint32 ABCD	R			SunSpec EvtVnd2
HR	40117	uint32 ABCD	R			SunSpec EvtVnd3
HR	40119	uint32 ABCD	R			SunSpec EvtVnd4

The first 100 registers are shown. The full list is in the map file.

Help improve this map

I tested it on a deviceReport whether it worked, even if you did not write the map.
Suggest a correctionEdit the file on GitHub; it opens a pull request.
Report a problemA wrong address, type, scale or byte order.
Read the formatWhat each key of the file means (SPEC.md).