new Goodwe modbus protocol map 2025

[mgx0]

20250328 GoodWe ARM 745 Modbus protocol Map.pdf

Hi, here is new modbus protocol map for versions 1230+. It would be worth updating the repo with new registers. You can close the issue if this is already planned and maintainers do have the map already.

[mletenay]

Thanks.
Will take a look and adjust mappings if necessary.

[mgx0]

the register values are already obsolete for FW versions 1123 and up (maybe older, but that's where i started to use GW-10KN-ET)

for example these are not reserved anymore, adjacent registers were extended to larger ints (16 > 32bit). there are more, this is just an example

    # 35124 reserved
    # 35129 reserved
    # 35134 reserved
    # 35137 reserved
    # 35139 reserved

i'm curious why nobody reported that yet, i've solved it for my local copy of this repo, but it is worth fixing it. The problem I see with updating it is, that it will stop working for older firmwares where this repo works fine.

[Sjeiz]

I can confirm register 35365 (ISO Value) works and is accurate on a GW-10KN-ET Plus (ET platform).
Read it via the raw modbus fallback in the current library (modbus035365), and the value matched the SEMS+ app's Insulation Resistance reading almost exactly at the same moment (raw 31683 → 3168.3 kΩ vs. app showing 3.168,00 kΩ).
Confirms the scale factor of 10 from the new map: raw value / 10 = kΩ.
Would be a useful addition to __all_sensors_mppt in et.py, e.g.:
Python
Happy to test a PR if someone puts one up — this register was missing from the previous (2022) protocol map that the library seems to be based on, so it makes sense it wasn't included yet.