Setting a ME3000SP in Passive mode

[zulufoxtrot]

Hello!

I would like to control my ME3000SP in passive mode, specifically the values listed below:
Desired Grid Power
Maximum Allowable Battery Power
Minimum Allowable Battery Power

(source: https://homeassistant-solax-modbus.readthedocs.io/en/latest/sofar-energy-storage-modes/)

It is my understanding that this integration does not offer native support for these controls. Instead, modbus commands must be sent by the user (or an automation) using the "write modbus registers" action while the inverter is in Passive mode.

I tried that:

But after about 5 seconds, I get this error:

The server has accepted the request and is processing it, but a long duration of time will be required to do so.

Note: I do NOT know the register addresses for the ME3000SP, but I tried a few common adresses and always get this message.
If I try random addresses, i sometimes get the "not addressable" error.

I tried searching here but couldn't find a definite answer (ex: #504 (comment)).

If someone could help me with this I'd appreciate it! Cheers

Useful data:

• Inverter version: 3.40
• Stick logger version: LSW3_15_270A_1.72
• Solarman integration version: 25.08.12

Stick logger settings:

Integration settings:

[peterdedecker83]

I also have an ME3000SP, inverter model SE1ES430, hardware version V100, software version V336, Logger module version ME_0D_2701_5.09. For some reason, I can only set working modes to Auto, Passive and Time of Use. (see also #831)

When set in Passive mode, I also tried to write a charge power to modbus register 4628 and a heartbeat (21845) to the address 4625, both using the write_single_register (FC6) method of the integration, but failed with "Error: The data address received in the request is not an allowable address for the server. "

So it seems at my side it was registered by the server, but immediately rejected by the stick as not allowed. Also with the register you want to read out, I get the same message: not an allowable address. So no timeout but actively rejected.