SRNE ASP48120SH3 Modbus Register Map (validated)

Validated Modbus register map for the SRNE ASP48120SH3 three-phase hybrid inverter, confirmedverified register-by-register against the live Nansana unit on (2026-07-21.27).

Bus: RS485, 9600 8N1, function code 03 (read holding registers), slave address 1. Source of truth (code): src/inverter/registers.py in nfe-modbus-energy-loggerlogger. Legend: VERIFIED = decoded value matched physical reality live. INFERRED = best-effort from live values. UNCONFIRMED = needs a different operating state (declarative,off-grid grouped/ byheavy OpenEMScharge) nature).to Thisprove.

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Valid isregister theranges human-readable(probed copy.

live)

• P00 product info: 0x0000 to 0x0049
• P01 battery / DC: 0x0100 to 0x0111
• P02 inverter telemetry: 0x0200 to 0x023F (0x0240 and beyond return "Illegal data address")
• P03 control commands: 0xDF00 to 0xDF09 (write-only, read back 0)
• Settings E (writable params): 0xE001 to 0xE02D
• Settings F: 0xF000 to 0xF01F

Live telemetrytelemetry, registersfull per-phase (P02) - VERIFIED

x0.1 x0.1 x0.01x0.1 W.var.VA.

Addressquantity	Fieldphase A	OpenEMSphase nature / channelB	Scalephase C	Signed	Unitnotes
0x0210grid voltage	state_code0x0213	System / STATE0x022A	enum0x022B	no	code
0x0212	bus_v	System / DC_BUS_VOLTAGE	0.1	no	V
0x0228grid current	pbus_v0x0214	System / DC_BUS_P_VOLTAGE(none)	0.1(none)	nox0.1 A. GRID CURRENT IS PHASE A ONLY in the documented map
grid frequency	0x0215	-	-	x0.01 Hz
inverter voltage	0x0216	0x022C	0x022D	x0.1 V
0x0229inverter current	nbus_v0x0217	System / DC_BUS_N_VOLTAGE0x022E	0.10x022F	no	V
0x0213	grid_v_l1	ElectricityMeter(grid) / VOLTAGE_L1	0.1	no	V
0x022A	grid_v_l2	ElectricityMeter(grid) / VOLTAGE_L2	0.1	no	V
0x022B	grid_v_l3	ElectricityMeter(grid) / VOLTAGE_L3	0.1	no	V
0x0214	grid_i_l1	ElectricityMeter(grid) / CURRENT_L1	0.1	no	A
0x0215inverter frequency	grid_freq0x0218	ElectricityMeter(grid) / FREQUENCY-	0.01-	no	Hz
0x0216load current	backup_v_l10x0219	ElectricityMeter(backup) / VOLTAGE_L10x0230	0.10x0231	no	V
0x022C	backup_v_l2	ElectricityMeter(backup) / VOLTAGE_L2	0.1	no	V
0x022D	backup_v_l3	ElectricityMeter(backup) / VOLTAGE_L3	0.1	no	V
0x0217	backup_i_l1	ElectricityMeter(backup) / CURRENT_L1	0.1	no	A
0x022Eload active power	backup_i_l20x021B	ElectricityMeter(backup) / CURRENT_L20x0232	0.10x0233	no	ANO total register: sum the three phases
0x022Fload reactive power	backup_i_l3(none)	ElectricityMeter(backup) / CURRENT_L30x0234	0.10x0235	no	AREACTIVE IS B/C ONLY (phase A: derive)
0x0218load apparent power	backup_freq0x021C	ElectricityMeter(backup) / FREQUENCY(none)	0.01(none)	no	HzAPPARENT IS PHASE A ONLY (B/C: derive S = sqrt(P^2 + Q^2))
0x0219load ratio	load_i_l1	Load / CURRENT_L1	0.1	no	A
0x021B	load_active_w	Load / ACTIVE_POWER	1	no	W
0x021C	load_apparent_va	Load / APPARENT_POWER	1	no	VA
0x021F	load_ratio_pct0x0236	Load / LOAD_RATIO	1	no0x0237	%
0x0100load PF	battery_soc0x021A	SymmetricEss-	-	reads 0 (unpopulated) - derive PF = P / SOC	1	no	%
0x0101	battery_v	SymmetricEss / VOLTAGE	0.1	no	V
0x0102	battery_i	SymmetricEss / CURRENT	0.1	yes	A
0x0220	temp_heatsink_a	Temp / TEMPERATURE_A	0.1	yes	C
0x0221	temp_heatsink_b	Temp / TEMPERATURE_B	0.1	yes	C
0x0222	temp_heatsink_c	Temp / TEMPERATURE_C	0.1	yes	CS

Derived

Other values

• Power factor = active power (0x021B) / apparent power (0x021C).
• Battery flow direction from the sign of battery current (0x0102): positive is charging, negative is discharging.
• MachineP02: state label from the code at 0x0210 (seeenum), gotchaspassword below).
status

0x0211, bus V 0x0212 (x0.1) = PBus 0x0228 + NBus 0x0229, inverter DC component 0x021D (mV), mains charge current 0x021E (x0.1 A), heat-sink temps 0x0220/0x0221/0x0222 (x0.1 C, 0x0223 bogus), PV charge current 0x0224 (0, no PV), inverter fault 0x0226, charge status 0x0227.

RegistersBattery deliberately/ NOT usedDC (validatedP01) wrong- VERIFIED

SOC 0x0100 (%), battery V 0x0101 (x0.1 V), battery I 0x0102 (x0.1 A, signed, + charge / - discharge), device temp 0x0103 (reads 0, dead), DC load 0x0104-0x0106 (0), PV1 0x0107-0x0109 (0, no PV), charge state 0x010B (enum, mislabelled on this model), charge power 0x010E (W), PV2 0x010F-0x0111 (0).

Extended block 0x0238 to 0x023F - MODEL-SPECIFIC, NOT in the SRNE V1.7 doc

Discovered by probing (the V1.7 doc stops at 0x0237). Read live in mains/bypass:

I

Addressaddr	Reasonlive value	INFERRED meaning	status
0x021A0x0238	~12 (1.2 A)	per-phase current B (likely GRID current B)	UNCONFIRMED (= load PF	ReadsB 0in (unpopulated). Derive PF from active/apparent instead.bypass)
0x0103 device temp0x0239	Reads~13 (1.3 A)	per-phase current C (likely GRID current C)	UNCONFIRMED
0x023A	~1816	active power phase A	INFERRED (matches load P_A)
0x023B	~267	active power phase B	INFERRED (matches load P_B)
0x023C	~201	active power phase C	INFERRED (matches load P_C)
0x023D	~2150	total or apparent (phase A ~2187 VA)	UNCONFIRMED
0x023E	~297	unknown	UNCONFIRMED
0x023F	~309	unknown	UNCONFIRMED

IMPORTANT: in mains/bypass mode grid current = load current = (near) inverter current, so grid-side vs load-side registers are indistinguishable from this state. To confirm 0x0238/0x0239 as GRID current B/C (and the 0x023A-F meanings), re-read during an off-grid or heavy-charge state where grid, load and inverter differ. Community SRNE docs found online map 0x0230+ differently (e.g. "R-phase voltage") because they are for other SRNE models; they do NOT apply to this three-phase ASP unit.

Corrections vs the generic SRNE V1.7 doc (do NOT trust the generic enums)

• Machine state 0x0210 = 2 means RUNNING (mains/bypass), NOT the generic "initialization". Only code 2 is verified.
• Power factor 0x021A reads 0. Derive PF = active (0x021B) / apparent (0x021C).
• Device temperature 0x0103 reads 0. Use the heat-sink temps 0x0220 to 0x0222.
• Charge-state enum 0x0223 heatsink D Reads 120.0 (bogus/unused). 0x0107 to 0x0111 PV This backup unit has no PV,0x010B reads 0."1 = quick charge"

  Machineeven stateat (0x0210)

  94%

  OnlySOC codewith 20 isW verified.charge Thepower, so the generic SRNE V1.7 charge-state tableenum does NOT match this model (genericeither.

says

2 is "initialization";

For the liveOpenEMS unitdriver at 2 is fully running). Verify the rest by observing transitions.

(important)

• 2There =is runningNO (mains/bypass)grid-power [VERIFIED]register, NO inverter-output-power register, NO ESS/battery AC-power register, and NO total-power register on this unit. The only power registers are LOAD power per phase.
• otherTherefore codes:the treatESS asSymmetricEss.ACTIVE_POWER unverifiedmust untilbe observed.DERIVED from battery DC power (0x0101 x 0x0102), the same V x I used for DcDischargePower. Do NOT map load power 0x021B to ACTIVE_POWER: 0x021B is what the loads consume (verified 1803 W while the battery was idle/charging ~16 W), and it is phase A only.
• Consumption/backup meter active + reactive power per phase are available from the load registers (0x021B/0x0232/0x0233 active, 0x0234/0x0235 reactive) and can populate the ElectricityMeter power channels.

Writes

Config/controlBoth FC06 and FC16 are supported. Read-only registers reject FC06with ("Illegalexception function").code Use7. FC16Settings (write0xE0xx multipleare registers), e.g. pymodbus write_registers.writable. Control 0xDF00 area starts(power/reset/restore) atis 0xDF00dangerous (power on/off) pluson the settinglive parameters.unit: documented, not fired.