Register Map

SunSpec Device Register Address Reference

Author

Published

March 17, 2026

This page provides the complete register map for the C-Battery SunSpec device, derived from a live device report. It lists the exact Modbus addresses for all implemented registers across each SunSpec model.

Device Details (at report generation):

Property	Value
Unit ID	101
Report Generated	2026-03-11 13:36
Models Found	1, 701, 702, 704, 713, 714, 715, 802

Overview

Quick reference for the most commonly used registers:

Register	Description	Model
`40074`	Inverter state	701
`40080`	AC Power (W)	701
`40087`–`40088`	AC Frequency (Hz)	701
`40115` / `40138` / `40161`	Phase currents L1/L2/L3	701
`40116` / `40139` / `40162`	Phase voltages L1-L2/L2-L3/L3-L1	701
`40299`	Power setpoint enable	704
`40300`	Power setpoint mode	704
`40301`–`40302`	Power setpoint (W)	704
`40346`	Energy rating (Wh)	713
`40347`	Available energy (Wh)	713
`40348`	State of Charge (%)	713
`40349`	State of Health (%)	713
`40358`	DC Current (A)	714
`40359`	DC Power (W)	714
`40411`	Max charge power (W)	802
`40412`	Max discharge power (W)	802
`40452`	Max charge current (A)	802
`40453`	Max discharge current (A)	802

Model 1 — Common (Base address: `40002`)

5 implemented / 4 not implemented

Address	Name	Type	Value / Notes
`40002`	ID	uint16	1
`40003`	L	uint16	66 (registers in model)
`40004`–`40019`	Mn	string	C-Battery
`40068`	DA	uint16	1 (Modbus device address)
`40069`	Pad	pad	0

Model 701 — AC Inverter (Base address: `40070`)

19 implemented / 53 not implemented

Address	Name	Type	Value / Notes
`40070`	ID	uint16	701
`40071`	L	uint16	153
`40074`	InvSt	enum16	3 (Running)
`40080`	W	int16	AC Power (scaled by W_SF)
`40083`	PF	int16	Power Factor (scaled by PF_SF)
`40087`–`40088`	Hz	uint32	AC Frequency (scaled by Hz_SF)
`40115`	AL1	int16	L1 Current (scaled by A_SF)
`40116`	VL1L2	uint16	L1-L2 Voltage (scaled by V_SF)
`40138`	AL2	int16	L2 Current (scaled by A_SF)
`40139`	VL2L3	uint16	L2-L3 Voltage (scaled by V_SF)
`40161`	AL3	int16	L3 Current (scaled by A_SF)
`40162`	VL3L1	uint16	L3-L1 Voltage (scaled by V_SF)
`40183`	A_SF	sunssf	-1
`40184`	V_SF	sunssf	-1
`40185`	Hz_SF	sunssf	-3
`40186`	W_SF	sunssf	2
`40187`	PF_SF	sunssf	-3
`40188`	VA_SF	sunssf	2
`40189`	Var_SF	sunssf	2

Model 704 — Basic Storage Controls (Base address: `40277`)

6 implemented / 39 not implemented

Address	Name	Type	Value / Notes
`40277`	ID	uint16	704
`40278`	L	uint16	65
`40299`	WSetEna	enum16	Power setpoint enable (0=Disabled, 1=Enabled)
`40300`	WSetMod	enum16	Power setpoint mode (1=Constant power)
`40301`–`40302`	WSet	int32	Power setpoint in Watts (scaled by WSet_SF)
`40332`	WSet_SF	sunssf	2

Note

To set a power target: write 1 to WSetEna (40299), 1 to WSetMod (40300), then write the desired raw value to WSet (40301–40302). A raw value of 70 with WSet_SF=2 means 70 × 10² = 7,000 W.

Model 713 — Storage Monitoring (Base address: `40344`)

8 implemented / 1 not implemented

Address	Name	Type	Value / Notes
`40344`	ID	uint16	713
`40345`	L	uint16	7
`40346`	WHRtg	uint16	Total energy rating (scaled by WH_SF)
`40347`	WHAvail	uint16	Available energy (scaled by WH_SF)
`40348`	SoC	uint16	State of Charge % (scaled by Pct_SF)
`40349`	SoH	uint16	State of Health % (scaled by Pct_SF)
`40351`	WH_SF	sunssf	2
`40352`	Pct_SF	sunssf	-1

Note

SoC example: raw value 850 with Pct_SF=-1 → 850 × 10⁻¹ = 85.0%

Model 714 — DC Measurements (Base address: `40353`)

8 implemented / 5 not implemented

Address	Name	Type	Value / Notes
`40353`	ID	uint16	714
`40354`	L	uint16	43
`40357`	NPrt	uint16	Number of DC ports (1)
`40358`	DCA	int16	DC Current (scaled by DCA_SF)
`40359`	DCW	int16	DC Power (scaled by DCW_SF)
`40368`	DCA_SF	sunssf	-1
`40369`	DCV_SF	sunssf	-1
`40370`	DCW_SF	sunssf	2

Model 802 — Storage Capabilities (Base address: `40407`)

8 implemented / 50 not implemented

Address	Name	Type	Value / Notes
`40407`	ID	uint16	802
`40408`	L	uint16	62
`40411`	WChaRteMax	uint16	Max charge power rate (scaled by WChaDisChaMax_SF)
`40412`	WDisChaRteMax	uint16	Max discharge power rate (scaled by WChaDisChaMax_SF)
`40452`	AChaMax	uint16	Max charge current (scaled by AMax_SF)
`40453`	ADisChaMax	uint16	Max discharge current (scaled by AMax_SF)
`40461`	WChaDisChaMax_SF	sunssf	2
`40469`	AMax_SF	sunssf	-1

Overview

Model 1 — Common (Base address: 40002)

Model 701 — AC Inverter (Base address: 40070)

Model 704 — Basic Storage Controls (Base address: 40277)

Model 713 — Storage Monitoring (Base address: 40344)

Model 714 — DC Measurements (Base address: 40353)

Model 802 — Storage Capabilities (Base address: 40407)

Model 1 — Common (Base address: `40002`)

Model 701 — AC Inverter (Base address: `40070`)

Model 704 — Basic Storage Controls (Base address: `40277`)

Model 713 — Storage Monitoring (Base address: `40344`)

Model 714 — DC Measurements (Base address: `40353`)

Model 802 — Storage Capabilities (Base address: `40407`)