Initial fixes and skeleton for Solax PM mode support

[fxstein]

This is work in progress not ready for merge. I opted to open a pull request early - even thought the changes are not final, to get more eyes on the parallel mode problems.

This patch so far does the basics:

Identify when inverter is part of a parallel mode setup with additional inverters present. Modifies various calculations to account for changes in parallel mode behavior.

If you have a parallel mode setup for testing or simply have thoughts, please comment away. I have the ability to test against a 3 way parallel system.

[fxstein]

@wills106 Here is a question I have:

I am trying to
understand the logic and source of the data for the I2 and I3 sensors, I can see the modbus registers but have not found those in the modbus documentation I have. Where can I find more details about these?

Thank you!

[fxstein]

@wills106 Here is a question I have:

I am trying to understand the logic and source of the data for the I2 and I3 sensors, I can see the modbus registers but have not found those in the modbus documentation I have. Where can I find more details about these?

Thank you!

I found a more up to date modbus documentation that has the parallel mode slave devices.

[romankysely]

Fine, could you share this resources? thx

[fxstein]

Fine, could you share this resources? thx

Wont be the latest, but covers the PM devices list: https://gbc-solino.cz/wp-content/uploads/2022/07/Hybrid-X1X3-G4-ModbusTCPRTU-V3.21-English_0622-public-version.pdf

[romankysely]

Thx. There is newer a little bit. v3.29
(Solax)Hybrid X1&X3-G4 ModbusTCP&RTU V3.29-English_231031 .pdf

[fxstein]

Ok made quite a bit of progress the past few days. During extensive testing I finally found a measured power logic bug in the core Solax logic. I will be opening a separate PR for that shortly.

[fxstein]

Opened a separate PR for the meter direction bug: #1082

[Pukkahq]

I have 2 Solax SK-SU5000E Modbus/TCP Interface (Solax-Modbus) inverters and have been running them in a pair via this code for a few years. I am happy to dive in to help and test, will your plug work roughly the same?
I am getting the import/export via the CT clamp on solax1 inverter.

[Pukkahq]

I thought I would install it and give it a go. I am not sure if I have the config correct, but you can see the problem having 2 inverters. 1 is charging while the other is discharging.