Solplanet ASW S/GEN series inverter (Modbus RTU)

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
rated_power	1027	U32BE	1	W
grid_rated_voltage	1300	U16	0.1	V
grid_rated_frequency	1301	U16	0.01	Hz
e_today_of_inverter	1302	U32BE	0.1	kWh
e_total_of_inverter	1304	U32BE	0.1	kWh
h_total	1306	U32BE	1	H
device_state	1308	U16	1
air_temperature	1310	I16	0.1	°C
bus_voltage	1316	U16	0.1	V
pv1_voltage	1318	U16	0.1	V
pv1_current	1319	U16	0.01	A
pv2_voltage	1320	U16	0.1	V
pv2_current	1321	U16	0.01	A
l1_phase_voltage	1358	U16	0.1
l1_phase_current	1359	U16	0.1
grid_frequency	1367	U16	0.01
apparent_power	1368	U32BE	1
active_power	1370	U32BE	1
reactive_power	1372	U32BE	1
power_factor	1374	I16	0.01
pv_total_power	1600	U32BE	1
pv_e_today	1602	U32BE	0.1
pv_e_total	1604	U32BE	0.1
battery_voltage	1616	U16	0.01
battery_current	1617	I16	0.1
battery_power	1618	U32BE	1
battery_temperature	1620	I16	0.1
battery_soc	1621	U16	0.01
battery_soh	1622	U16	0.01
eps_load_voltage	1633	U16	0.1
eps_load_current	1634	U16	0.1
eps_load_active_power	1636	U32BE	1

link settings as documented (unverified): RTU; unit ID 3; FC 03,04,06,16; MODBUS protocol format: RTU format. Each communication data unit is composed of 1 bit starting bit, 8 bit data bit and 1 bit stopping bit, no parity.

bench facts as documented (unverified)

broadcast	supported
model register	1018
serial register	1002
firmware register	1029
doc revision	MB001_ASW GEN-Modbus-en_V2.1.3

⚠ disputed: pv1_voltage @ 1318 — disputed by Solplanet Modbus Protocol Technical Guide which lists PV1 voltage at 31319 (or 1318 with a 30000 offset depending on client implementation, but the raw register is 1318/31319)

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

Inverters return 0xFFFF (65535) for battery registers (such as Battery SOH at 1622) when the inverter does not have active values or is not connected to a battery, which needs to be filtered out as NaN. [source]
Users attempting to integrate the inverter via Home Assistant Modbus may receive an '0x02 Illegal address' error if they use the 30000-offset address (e.g., 31319) instead of the raw decimal address (e.g., 1318) depending on the Modbus client's automatic offset handling. [source]
confirmed: MB001_ASW GEN-Modbus-en_V2.1.3 — confirmed by Solplanet Modbus Protocol Technical Guide PDF on Scribd
confirmed: default_unit_id: 3 — confirmed by Solplanet Ai-logger Modbus RTU User Manual
confirmed: rated_power @ 1027, grid_rated_voltage @ 1300, grid_rated_frequency @ 1301, e_today_of_inverter @ 1302, e_total_of_inverter @ 1304, h_total @ 1306, device_state @ 1308, air_temperature @ 1310, bus_voltage @ 1316, pv1_voltage @ 1318, pv1_current @ 1319, pv2_voltage @ 1320, pv2_current @ 1321 — confirmed by Solplanet Ai-logger Modbus TCP Protocol Guide

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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