CPS 25kW-480 UL inverter

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
total_yield	22	U32BE	1	kWh
daily_yield	24	U16	0.1	kWh
efficiency	25	U16	0.001	%
power_factor	26	I16	0.001
p_max	27	U16	0.1	kW
run_time	28	U16	0.1	Min
active_power	29	U16	0.1	kW
apparent_power	30	U16	0.1	KVA
grid_voltage_uab	31	U16	0.1	V
grid_voltage_ubc	32	U16	0.1	V
grid_voltage_uca	33	U16	0.1	V
grid_current_ia	34	U16	0.1	A
grid_current_ib	35	U16	0.1	A
grid_current_ic	36	U16	0.1	A
pv1_voltage	37	U16	0.1	V
pv1_current	38	I16	0.1	A
pv2_voltage	39	U16	0.1	V
pv2_current	40	I16	0.1	A
pv3_voltage	41	U16	0.1	V
pv3_current	42	I16	0.1	A
grid_frequency	43	U16	0.1	Hz
heatsink_temperature	44	I16	0.1	C
ambient_temperature	45	I16	0.1	C
transformer_temperature	46	I16	0.1	C
work_mode	47	U16	1
reactive_power	59	I16	0.1	KVA
grid_voltage_uab_high_res	32768	U16	0.1	V
grid_voltage_ubc_high_res	32769	U16	0.1	V
grid_voltage_uca_high_res	32770	U16	0.1	V
grid_voltage_ua	32771	U16	0.1	V
grid_voltage_ub	32772	U16	0.1	V
grid_voltage_uc	32773	U16	0.1	V
grid_frequency_a	32774	U16	0.1	Hz
grid_frequency_b	32775	U16	0.1	Hz
grid_frequency_c	32776	U16	0.1	Hz
grid_frequency_sys	32779	U16	0.1	Hz
grid_current_ia_high_res	33024	U16	0.1
grid_current_ib_high_res	33025	U16	0.1
grid_current_ic_high_res	33026	U16	0.1
active_power_total	33030	U16	0.1
reactive_power_total	33034	U16	0.1
power_factor_total	33038	U16	0.01
dc_power_total	33281	U16	0.1
pv1_voltage_high_res	33282	U16	0.1
pv1_current_high_res	33283	U16	0.1
pv2_voltage_high_res	33284	U16	0.1
pv2_current_high_res	33285	U16	0.1
module_temperature_high_res	33538	U16	0.1
internal_temperature_high_res	33539	U16	0.1
insulation_resistance	33540	U16	1
leakage_current	33541	U16	1
remote_on_off	4096	U16	1
remote_active_power_set	4097	U16	0.1
remote_power_factor_set	4098	I16	0.001
remote_reactive_power_set	4099	I16	0.1

link settings as documented (unverified): RTU; FC 03,04,06,16; DataBits: 8, DTR: Disable, RTS: Disable

bench facts as documented (unverified)

sentinel values	Not Implemented: int8=0x80, uint8=0xFF, int16=0x8000, uint16=0xFFFF, int32=0x80000000, uint32=0xFFFFFFFF, string=0x00
model register	0x000a
serial register	0x0006
firmware register	0x0041
doc revision	0.05
firmware applicability	V01.00

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

When the inverter is inactive or not producing power (e.g., after sunset), it reports the sentinel value 0xFFFF (65535) for power/current registers. If the monitoring system or battery management system does not handle this sentinel value, it may scale it to 6553.5 kW, causing false readings and potential system shutdowns. [source]
confirmed: comms framing, function codes, and serial parameters — confirmed by CPS Inverter Model Data Mapping Specification for 403X and CPS 25kW 208V/480V UL Modbus Map Spec
confirmed: identification registers (firmware 0x0041, model 0x000a, serial 0x0006) — confirmed by CPS Inverter Model Data Mapping Specification for 403X
confirmed: quirks sentinel values (int8=0x80, uint8=0xFF, int16=0x8000, uint16=0xFFFF, int32=0x80000000, uint32=0xFFFFFFFF, string=0x00) — confirmed by CPS Inverter Model Data Mapping Specification for 403X
confirmed: register map summary (total_yield @ 22, daily_yield @ 24, grid_voltage_uab @ 31, grid_voltage_uab_high_res @ 32768, active_power_total @ 33030) — confirmed by CPS 25kW 208V/480V UL Modbus Map Spec and AGG Software Chint Power Modbus Map

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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