Growatt inverter (Modbus RTU Protocol II)

Register map(s) for this device, with a note of how far each has been checked. Addresses are 0-based, as on the wire. Scale and byte order are confirmed only at the hardware-verified rung.

coherence-checked

Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.

point	address (0-based)	type	scale	unit
OnOff	0	U16	1
Inverter Status	0	U16	1
SaftyFuncEn	1	U16	1
Ppv H	1	U16	0.1	W
PF CMD memory state	2	U16	1
Ppv L	2	U16	0.1	W
Active P Rate	3	U16	1	%
Vpv1	3	U16	0.1	V
Reactive P Rate	4	I16	1	%
PV1Curr	4	U16	0.1	A
Power factor	5	U16	1
Ppv1 H	5	U16	0.1	W
Pmax H	6	U16	0.1	VA
Ppv1 L	6	U16	0.1	W
Pmax L	7	U16	0.1	VA
Vpv2	7	U16	0.1	V
Vnormal	8	U16	0.1	V
PV2Curr	8	U16	0.1	A
Fw version H	9	U16	1
Ppv2 H	9	U16	0.1	W
Fw version M	10	U16	1
Ppv2 L	10	U16	0.1	W
Fw version L	11	U16	1
Vpv3	11	U16	0.1	V
Fw version2 H	12	U16	1
PV3Curr	12	U16	0.1	A
Fw version2 M	13	U16	1
Ppv3 H	13	U16	0.1	W
Fw version2 L	14	U16	1
Ppv3 L	14	U16	0.1	W
LCD language	15	U16	1
Vpv4	15	U16	0.1	V
CountrySelected	16	U16	1
PV4Curr	16	U16	0.1	A
Vpv start	17	U16	0.1	V
Ppv4 H	17	U16	0.1	W
Time start	18	U16	1	s
Ppv4 L	18	U16	0.1	W
RestartDelayTime	19	U16	1	s
Vpv5	19	U16	0.1	V
wPowerStartSlope	20	U16	0.1	%
PV5Curr	20	U16	0.1	A
wPowerRestartSlopeEE	21	U16	0.1	%
Ppv5H	21	U16	0.1	W
wSelectBaudrate	22	U16	1
Ppv5 L	22	U16	0.1	W
Serial NO 1-2	23	U16	1
Vpv6	23	U16	0.1	V
Serial NO 3-4	24	U16	1
PV6Curr	24	U16	0.1	A
Serial NO 5-6	25	U16	1
Ppv6 H	25	U16	0.1	W
Serial NO 7-8	26	U16	1
Ppv6 L	26	U16	0.1	W
Serial NO 9-10	27	U16	1
Vpv7	27	U16	0.1	V
Module H	28	U16	1
PV7Curr	28	U16	0.1	A
Module L	29	U16	1
Ppv7 H	29	U16	0.1	W
Com Address	30	U16	1
Ppv7 L	30	U16	0.1	W
FlashStart	31	U16	1
Vpv8	31	U16	0.1	V
Reset User Info	32	U16	1
PV8Curr	32	U16	0.1	A
Reset to factory	33	U16	1
Ppv8 H	33	U16	0.1	W
Manufacturer Info 8	34	U16	1
Ppv8 L	34	U16	0.1	W
Manufacturer Info 7	35	U16	1
Pac H	35	U16	0.1	W
Manufacturer Info 6	36	U16	1
Pac L	36	U16	0.1	W
Manufacturer Info 5	37	U16	1
Fac	37	U16	0.01	Hz
Manufacturer Info 4	38	U16	1
Vac1	38	U16	0.1	V
Manufacturer Info 3	39	U16	1
Iac1	39	U16	0.1	A
Manufacturer Info 2	40	U16	1
Pac1 H	40	U16	0.1	VA
Manufacturer Info 1	41	U16	1
Pac1 L	41	U16	0.1	VA
bfailsafeEn	42	U16	1
Vac2	42	U16	0.1	V
DTC	43	U16	1
Iac2	43	U16	0.1	A
TP	44	U16	1
Pac2 H	44	U16	0.1	VA
Sys Year	45	U16	1
Pac2 L	45	U16	0.1	VA
Sys Month	46	U16	1
Vac3	46	U16	0.1	V
Sys Day	47	U16	1
Iac3	47	U16	0.1	A
Sys Hour	48	U16	1
Pac3 H	48	U16	0.1	VA
Sys Min	49	U16	1
Pac3 L	49	U16	0.1	VA
Sys Sec	50	U16	1
Vac_RS	50	U16	0.1	V
Sys Weekly	51	U16	1
Vac_ST	51	U16	0.1	V
Vac low	52	U16	0.1	V
Vac_TR	52	U16	0.1	V
Vac high	53	U16	0.1	V
Eactoday H	53	U16	0.1	kWh
Fac low	54	U16	0.01	Hz
Eac today L	54	U16	0.1	kWh
Fac high	55	U16	0.01	Hz
Eac total H	55	U16	0.1	kWh
Vac low 2	56	U16	0.1	V
Eac total L	56	U16	0.1	kWh
Vac high 2	57	U16	0.1	V
Time total H	57	U16	0.5	s
Fac low 2	58	U16	0.01	Hz
Time total L	58	U16	0.5	s
Fac high 2	59	U16	0.01	Hz
Epv1_today H	59	U16	0.1	kWh
Vac low 3	60	U16	0.1	V
Epv1_today L	60	U16	0.1	kWh
Vac high 3	61	U16	0.1	V
Epv1_total H	61	U16	0.1	kWh
Epv2_today	63	U32BE	0.1	kWh
Epv2_total	65	U32BE	0.1	kWh
Epv3_today	67	U32BE	0.1	kWh
Epv3_total	69	U32BE	0.1	kWh
Epv4_today	71	U32BE	0.1	kWh
Epv4_total	73	U32BE	0.1	kWh
Epv5_today	75	U32BE	0.1	kWh
Epv5_total	77	U32BE	0.1	kWh
Epv6_today	79	U32BE	0.1	kWh
Epv6_total	81	U32BE	0.1	kWh
Epv7_today	83	U32BE	0.1	kWh
Epv7_total	85	U32BE	0.1	kWh
Epv8_today	87	U32BE	0.1	kWh
PFModel	89	U16	1
Epv8_total H	89	U16	0.1	kWh
GPRS IP Flag	90	U16	1
Epv8_total L	90	U16	0.1	kWh
FreqDerateStart	91	U16	0.01	Hz
Epv_total H	91	U16	0.1	kWh
FLrate	92	U16	0.1
Epv_total L	92	U16	0.1	kWh
V1S	93	U16	0.1	V
Temp1	93	I16	0.1	C
V2S	94	U16	0.1	V
Temp2	94	I16	0.1	C
V1L	95	U16	0.1	V
Temp3	95	I16	0.1	C
V2L	96	U16	0.1	V
Temp4	96	U16	1
Qlockinpower	97	U16	1	%
uwBatVolt_DSP	97	U16	0.1	V
QlockOutpower	98	U16	1	%
P Bus Voltage	98	U16	0.1	V
LIGridV	99	U16	0.1	V
N Bus Voltage	99	U16	0.1	V
LOGridV	100	U16	0.1	V
IPF	100	U16	1
PFAdj1	101	U16	1
RealOPPercent	101	U16	1	%
PFAdj2	102	U16	1
OPFullwatt H	102	U16	1
PFAdj3	103	U16	1
OPFullwatt L	103	U16	0.1	W
DeratingMode	104	U16	1
Fault Maincode	105	U16	1
Fault Subcode	107	U16	1
ExportLimit_En/dis	122	U16	1
ExportLimitPowerRate	123	U16	0.1	%
TrakerModel	124	U16	1
Float charge current limit	1000	U16	0.1	A
PF CMD memory state	1001	U16	1
VbatStartForDischarge	1002	U16	0.1	V
VbatlowWarnClr	1003	U16	0.1	V
Vbatstopfordischarge	1004	U16	0.01	V
Vbat stop for charge	1005	U16	0.01	V
Vbat start for discharge	1006	U16	0.01	V
Vbat constant charge	1007	U16	0.01	V
EESysInfo.SysSetEn	1008	U16	1
Battemp lower limit d	1009	U16	0.1	℃
Pdischarge1 H	1009	U16	0.1	W
Bat temp upper limit d	1010	U16	0.1	℃
Pdischarge1 L	1010	U16	0.1	W
Bat temp lower limit c	1011	U16	0.1	℃
Pcharge1 H	1011	U16	0.1	W
Bat temp upper limit c	1012	U16	0.1	℃
Pcharge1 L	1012	U16	0.1	W
uwUnderFreDischargeDelyTime	1013	U16	50	ms
Vbat	1013	U16	0.1	V
BatMdlSerialNum	1014	U16	1
SOC	1014	U16	1	%
BatMdlParallNum	1015	U16	1
Pactouser R H	1015	U16	0.1	W
DRMS_EN	1016	U16	1
Pactouser R L	1016	U16	0.1	W
Bat First Start Time 4	1017	U16	1
Pactouser S H	1017	U16	0.1	W
Bat First Stop Time 4	1018	U16	1
Pactouser S L	1018	U16	0.1	W
BatFirst on/off Switch 4	1019	U16	1
Pactouser T H	1019	U16	0.1	W
Bat First Start Time 5	1020	U16	1
Pactouser T L	1020	U16	0.1	W
Bat First Stop Time 5	1021	U16	1
PactouserTotal H	1021	U16	0.1	W
BatFirst on/off Switch 5	1022	U16	1
PactouserTotal L	1022	U16	0.1	W
Bat First Start Time 6	1023	U16	1
Pac to grid R H	1023	U16	0.1	W
Bat First Stop Time 6	1024	U16	1
Pac to grid R L	1024	U16	0.1	W
BatFirst on/off Switch 6	1025	U16	1
Pactogrid S H	1025	U16	0.1	W
Grid First Start Time 4	1026	U16	1
Pactogrid S L	1026	U16	0.1	W
Grid First Stop Time 4	1027	U16	1
Pactogrid T H	1027	U16	0.1	W
Grid First Stop Switch 4	1028	U16	1
Pactogrid T L	1028	U16	0.1	W
Grid First Start Time 5	1029	U16	1
Pactogrid total H	1029	U16	0.1	W
Grid First Stop Time 5	1030	U16	1
Pactogrid total L	1030	U16	0.1	W
Grid First Stop Switch 5	1031	U16	1
PLocalLoad R H	1031	U16	0.1	W
Grid First Start Time 6	1032	U16	1
PLocalLoad R L	1032	U16	0.1	W
Grid First Stop Time 6	1033	U16	1
PLocalLoad S H	1033	U16	0.1	W
Grid First Stop Switch 6	1034	U16	1
PLocalLoad S L	1034	U16	0.1	W
Bat First Start Time 4	1035	U16	1
PLocalLoadT H	1035	U16	0.1	W
/	1036	U16	1
PLocalLoadT L	1036	U16	0.1	W
bCTMode	1037	U16	1
PLocalLoad total H	1037	U16	0.1	W
CTAdjust	1038	U16	1
PLocalLoad total L	1038	U16	0.1	W
/	1039	U16	1
IPM Temperature	1039	I16	0.1	℃
/	1040	U16	1
Battery Temperature	1040	I16	0.1	℃
/	1041	U16	1
SP DSP Status	1041	U16	1
/	1042	U16	1
SP Bus Volt	1042	U16	0.1	V
/	1043	U16	1
Priority	1044	U16	1
Etouser_today H	1044	U16	0.1	kWh
Etouser_total	1046	U32BE	0.1	kWh
Etogrid_today	1048	U32BE	0.1	kWh
Etogrid_total	1050	U32BE	0.1	kWh
Edischarge1_today	1052	U32BE	0.1	kWh
Edischarge1_total	1054	U32BE	0.1	kWh
Echarge1_today	1056	U32BE	0.1	kWh
Echarge1_total	1058	U32BE	0.1	kWh
Inverter Status	3000	U16	1
Ppv	3001	U32BE	0.1	W
Vpv1	3003	U16	0.1	V
Ipv1	3004	U16	0.1	A
Ppv1	3005	U32BE	0.1	W
Pac	3023	U32BE	0.1	W
Fac	3025	U16	0.01	Hz
Vac1	3026	U16	0.1	V
Iac1	3027	U16	0.1	A
Pac1	3028	U32BE	0.1	VA
Ptouser total	3041	U32BE	0.1	W
Ptogrid total	3043	U32BE	0.1	W
Ptoload total	3045	U32BE	0.1	W
Time total	3047	U32BE	0.5	s
Eac today	3049	U32BE	0.1	kWh
Eac total	3051	U32BE	0.1	kWh

link settings as documented (unverified): RTU; default 9600 8N1; unit ID 1; FC 03,04,06,16; Valid slave device addresses are in the range of 0 - 254 decimal. 0 is the broadcast address.

bench facts as documented (unverified)

wiring notes	RS485 interface
max registers/read	125
response timeout	850 ms
inter-frame delay	850 ms
broadcast	supported
protocol notes	Minimum CMD period (RS485 Time out) is 850ms. Suggestion is 1s.
model register	Holding 28-29
serial register	Holding 23-27
firmware register	Holding 9-11
identification notes	New serial number registers are also available at Holding 209-223.
doc revision	V1.24

field reports — community-sourced, unverified (checked 2026-06-11)

Grid Export Power and Grid Import Power values were swapped in previous integration versions, requiring manual correction or disabling of auto-detected 'Invert Grid Power' settings. [source]
VPP battery charge/discharge daily values (registers 31202 and 31206) were swapped on SPH V2.01 profiles (sph_3000_6000_v201 and sph_7000_10000_v201). [source]
Reusing SPH/SPF Modbus assumptions on Growatt WIT series hybrid inverters causes broken AC charging control, missing VPP entities, and conflicts with external controllers due to different register behaviors (e.g., signed values on register 30409). [source]
On some Growatt SPH models, register 1044 is read-only, preventing users from writing to it to enforce priority settings. [source]
confirmed: Baud rates [9600, 38400] with default 9600, parity N, stop bits 1, and slave addresses 0-254 (0 as broadcast) — confirmed by Growatt Inverter Modbus RTU Protocol II V1.24 and community documentation
confirmed: Identification registers (Firmware at Holding 9-11, Model at Holding 28-29, Serial at Holding 23-27, and new serial registers at Holding 209-223) — confirmed by Growatt Inverter Modbus RTU Protocol II V1.24 and GitHub integrations
confirmed: Inter-frame delay and response timeout of 850ms (with 1s suggested) — confirmed by Growatt Inverter Modbus RTU Protocol II V1.24 and ESPHome community threads
confirmed: Register map addresses (inverter_status @ 0, ppv @ 1, vpv1 @ 3, ipv1 @ 4, ppv1 @ 5, vpv2 @ 7, ipv2 @ 8, ppv2 @ 9, pac @ 35, fac @ 37, vac1 @ 38, iac1 @ 39, pac1 @ 40, vac2 @ 42, iac2 @ 43, pac2 @ 44, vac3 @ 46, iac3 @ 47, pac3 @ 48, eac_today @ 53, eac_total @ 55, time_total @ 57, temp_inverter @ 93, temp_ipm @ 94, temp_boost @ 95, p_bus_voltage @ 98, n_bus_voltage @ 99, vbat @ 1013, soc @ 1014, battery_temperature @ 1040) — confirmed by Growatt Inverter Modbus RTU Protocol II V1.24 and evcc/ESPHome configurations

The trust ladder

Each rung states what it proved and what it did not. Gray until proven; green is earned by hardware only.

generated — A prompt produced it. Unproven — anyone can regenerate this.
structure-verified — Decode path is structurally sound (addresses, widths, finite values). Does NOT prove word order or scaling.
coherence-checked — Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.
hardware-verified (software-key) x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.

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