SRNE ASP48120SH3 Modbus Register Map (validated)

Validated Modbus register map for the SRNE ASP48120SH3 three-phase hybrid inverter, confirmed against the live unit on 2026-07-21. 
 Bus : RS485, 9600 8N1, function code 03 (read holding registers), slave address 1.
 Source of truth : src/inverter/registers.py in nfe-modbus-energy-logger (declarative, grouped by OpenEMS nature). This page is the human-readable copy. 
 Live telemetry registers 
 
 
 
 Address 
 Field 
 OpenEMS nature / channel 
 Scale 
 Signed 
 Unit 
 
 
 
 
 0x0210 
 state_code 
 System / STATE 
 enum 
 no 
 code 
 
 
 0x0212 
 bus_v 
 System / DC_BUS_VOLTAGE 
 0.1 
 no 
 V 
 
 
 0x0228 
 pbus_v 
 System / DC_BUS_P_VOLTAGE 
 0.1 
 no 
 V 
 
 
 0x0229 
 nbus_v 
 System / DC_BUS_N_VOLTAGE 
 0.1 
 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 
 
 
 0x0215 
 grid_freq 
 ElectricityMeter(grid) / FREQUENCY 
 0.01 
 no 
 Hz 
 
 
 0x0216 
 backup_v_l1 
 ElectricityMeter(backup) / VOLTAGE_L1 
 0.1 
 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 
 
 
 0x022E 
 backup_i_l2 
 ElectricityMeter(backup) / CURRENT_L2 
 0.1 
 no 
 A 
 
 
 0x022F 
 backup_i_l3 
 ElectricityMeter(backup) / CURRENT_L3 
 0.1 
 no 
 A 
 
 
 0x0218 
 backup_freq 
 ElectricityMeter(backup) / FREQUENCY 
 0.01 
 no 
 Hz 
 
 
 0x0219 
 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_pct 
 Load / LOAD_RATIO 
 1 
 no 
 % 
 
 
 0x0100 
 battery_soc 
 SymmetricEss / 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 
 C 
 
 
 
 Derived 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. 
 Machine state label from the code at 0x0210 (see gotchas below). 
 
 Registers deliberately NOT used (validated wrong on this model) 
 
 
 
 Address 
 Reason 
 
 
 
 
 0x021A load PF 
 Reads 0 (unpopulated). Derive PF from active/apparent instead. 
 
 
 0x0103 device temp 
 Reads 0. Use the heat-sink temps 0x0220 to 0x0222. 
 
 
 0x0223 heatsink D 
 Reads 120.0 (bogus/unused). 
 
 
 0x0107 to 0x0111 PV 
 This backup unit has no PV, reads 0. 
 
 
 
 Machine state (0x0210) 
 Only code 2 is verified. The generic SRNE V1.7 state table does NOT match this model (generic says 2 is "initialization"; the live unit at 2 is fully running). Verify the rest by observing transitions. 
 
 2 = running (mains/bypass) [VERIFIED] 
 other codes: treat as unverified until observed. 
 
 Writes 
 Config/control registers reject FC06 ("Illegal function"). Use FC16 (write multiple registers), e.g. pymodbus write_registers. Control area starts at 0xDF00 (power on/off) plus the setting parameters.