The id register returns a value other than 211. Why?

SunSpec devices auto-advertise their model ID based on their wiring configuration. A value of 212 means split single-phase (ABN), 213 means wye-connected three-phase, and 214 means delta-connected three-phase. Select the template matching the actual model ID reported by the device rather than changing wiring to force 211.

All float32 registers return garbage or wildly wrong values.

The SunSpec floating-point model uses IEEE 754 big-endian byte order with the high word first. If your gateway or Modbus master swaps word order, every float32 will decode incorrectly. Verify that the ModbusCloud Gateway is set to big-endian word order for this device, which is required by the SunSpec specification.

The meter connects but phvphb and phvphc always read zero.

Model 211 covers single-phase AN or AB connections. Registers for phases B and C are present in the block but are not populated by a single-phase device. Zero or NaN in those fields is expected behaviour, not an error. Use a Model 213 or 214 template for three-phase meters.

The gateway connects but no register values appear in the portal.

Check that the SunSpec discovery address is correct: the device must have the SunSpec magic identifier at Modbus register 40001 or 50001. If the meter uses a non-standard base address, set the SunSpec start address explicitly in the ModbusCloud Gateway configuration. Also confirm the unit ID matches the meter's configured Modbus slave address.

Free Modbus template: SunSpec Model 211 — single phase (AN or AB) meter

Name: SunSpec Model 211 — single phase (AN or AB) meter
Brand: SunSpec
SKU: 16df29ec-52b1-4670-8f57-3cfe79fdcbcc

SunSpec Model 211 is a standardised floating-point AC energy meter definition used across single-phase (AN or AB) grid-connection points in solar PV, battery storage, and building-energy installations. The template reads the complete SunSpec Model 211 register block over Modbus TCP, covering per-phase current, line-to-neutral and line-to-line voltage, frequency, real power, apparent power, reactive power, power factor, four-quadrant cumulative energy (import and export in Wh, VAh, and varh), and the event-flag register. Any device advertising model ID 211 via the SunSpec discovery sequence is compatible. The template also covers the related models: SunSpec Model 212, SunSpec Model 213, and SunSpec Model 214. ModbusCloud Gateway connects over TCP and surfaces all registers in your portal without manual address entry.

Registers (64)

64 read / 0 write

Name	Address	Function	Type	Unit	Access
id SunSpec model identifier, value 211 for single-phase meter.	0	FC03	uint16		R
l Length of this model block in 16-bit registers.	1	FC03	uint16		R
a Total AC current, sum of all active phases.	2	FC03	float32	A	R
apha Phase A AC current in amperes.	4	FC03	float32	A	R
aphb Phase B AC current in amperes.	6	FC03	float32	A	R
aphc Phase C AC current in amperes.	8	FC03	float32	A	R
phv Average line-to-neutral voltage across active phases.	10	FC03	float32	V	R
phvpha Phase A line-to-neutral voltage in volts.	12	FC03	float32	V	R
phvphb Phase B line-to-neutral voltage in volts.	14	FC03	float32	V	R
phvphc Phase C line-to-neutral voltage in volts.	16	FC03	float32	V	R
ppv Average line-to-line voltage across active phase pairs.	18	FC03	float32	V	R
ppvphab Line-to-line voltage between phases A and B.	20	FC03	float32	V	R
ppvphbc Line-to-line voltage between phases B and C.	22	FC03	float32	V	R
ppvphca Line-to-line voltage between phases C and A.	24	FC03	float32	V	R
hz AC grid frequency in hertz.	26	FC03	float32	Hz	R
w Total real (active) power in watts.	28	FC03	float32	W	R
wpha Phase A real power in watts.	30	FC03	float32	W	R
wphb Phase B real power in watts.	32	FC03	float32	W	R
wphc Phase C real power in watts.	34	FC03	float32	W	R
va Total apparent power in volt-amperes.	36	FC03	float32	VA	R
vapha Phase A apparent power in volt-amperes.	38	FC03	float32	VA	R
vaphb Phase B apparent power in volt-amperes.	40	FC03	float32	VA	R
vaphc Phase C apparent power in volt-amperes.	42	FC03	float32	VA	R
var Total reactive power in var.	44	FC03	float32	var	R
varpha Phase A reactive power in var.	46	FC03	float32	var	R
varphb Phase B reactive power in var.	48	FC03	float32	var	R
varphc Phase C reactive power in var.	50	FC03	float32	var	R
pf Total power factor, dimensionless.	52	FC03	float32	PF	R
pfpha Phase A power factor.	54	FC03	float32	PF	R
pfphb Phase B power factor.	56	FC03	float32	PF	R
pfphc Phase C power factor.	58	FC03	float32	PF	R
totwhexp Cumulative total active energy exported in watt-hours.	60	FC03	float32	Wh	R
totwhexppha Phase A cumulative active energy exported in watt-hours.	62	FC03	float32	Wh	R
totwhexpphb Phase B cumulative active energy exported in watt-hours.	64	FC03	float32	Wh	R
totwhexpphc Phase C cumulative active energy exported in watt-hours.	66	FC03	float32	Wh	R
totwhimp Cumulative total active energy imported in watt-hours.	68	FC03	float32	Wh	R
totwhimppha Phase A cumulative active energy imported in watt-hours.	70	FC03	float32	Wh	R
totwhimpphb Phase B cumulative active energy imported in watt-hours.	72	FC03	float32	Wh	R
totwhimpphc Phase C cumulative active energy imported in watt-hours.	74	FC03	float32	Wh	R
totvahexp Cumulative total apparent energy exported in volt-ampere-hours.	76	FC03	float32	VAh	R
totvahexppha Phase A cumulative apparent energy exported in volt-ampere-hours.	78	FC03	float32	VAh	R
totvahexpphb Phase B cumulative apparent energy exported in volt-ampere-hours.	80	FC03	float32	VAh	R
totvahexpphc Phase C cumulative apparent energy exported in volt-ampere-hours.	82	FC03	float32	VAh	R
totvahimp Cumulative total apparent energy imported in volt-ampere-hours.	84	FC03	float32	VAh	R
totvahimppha Phase A cumulative apparent energy imported in volt-ampere-hours.	86	FC03	float32	VAh	R
totvahimpphb Phase B cumulative apparent energy imported in volt-ampere-hours.	88	FC03	float32	VAh	R
totvahimpphc Phase C cumulative apparent energy imported in volt-ampere-hours.	90	FC03	float32	VAh	R
totvarhimpq1 Total reactive energy imported, quadrant 1, in var-hours.	92	FC03	float32	varh	R
totvarhimpq1pha Phase A reactive energy imported, quadrant 1, in var-hours.	94	FC03	float32	varh	R
totvarhimpq1phb Phase B reactive energy imported, quadrant 1, in var-hours.	96	FC03	float32	varh	R
totvarhimpq1phc Phase C reactive energy imported, quadrant 1, in var-hours.	98	FC03	float32	varh	R
totvarhimpq2 Total reactive energy imported, quadrant 2, in var-hours.	100	FC03	float32	varh	R
totvarhimpq2pha Phase A reactive energy imported, quadrant 2, in var-hours.	102	FC03	float32	varh	R
totvarhimpq2phb Phase B reactive energy imported, quadrant 2, in var-hours.	104	FC03	float32	varh	R
totvarhimpq2phc Phase C reactive energy imported, quadrant 2, in var-hours.	106	FC03	float32	varh	R
totvarhexpq3 Total reactive energy exported, quadrant 3, in var-hours.	108	FC03	float32	varh	R
totvarhexpq3pha Phase A reactive energy exported, quadrant 3, in var-hours.	110	FC03	float32	varh	R
totvarhexpq3phb Phase B reactive energy exported, quadrant 3, in var-hours.	112	FC03	float32	varh	R
totvarhexpq3phc Phase C reactive energy exported, quadrant 3, in var-hours.	114	FC03	float32	varh	R
totvarhexpq4 Total reactive energy exported, quadrant 4, in var-hours.	116	FC03	float32	varh	R
totvarhexpq4pha Phase A reactive energy exported, quadrant 4, in var-hours.	118	FC03	float32	varh	R
totvarhexpq4phb Phase B reactive energy exported, quadrant 4, in var-hours.	120	FC03	float32	varh	R
totvarhexpq4phc Phase C reactive energy exported, quadrant 4, in var-hours.	122	FC03	float32	varh	R
evt Meter event bitfield, flags active faults or warnings.	124	FC03	uint32		R

SunSpec Model 211 — single phase (AN or AB) meter

Overview

Use cases

Installation

Things to watch for

Registers (64)

Working with Modbus in your projects?

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