Adding support for PV3300/EP3300 Inverter/Charger

[Fourthbean]

Dylan, I have a split phase Must inverter and have been toying with your code. It appears what I need to do is build out whatever is needed for it to be an additional type of device. The addresses you have for the PH model don't match up with what I have, but the behavior appears similar. Uses 0a 03 to poll for sensor values and 0a 10 to write settings.

I've been able to capture serial data from the solar application but I'm not a programmer and not sure exactly what I need to do for adding all the files/data needed to make my inverter work with your code. Having Home assistant integration would be amazing!

So, my first question is whether your code is working for the Must device you have. Or are you still working on functionality? If it does work, any chance you could point me at what files I should re-create and other pointers to said files I should adjust to make mine work?

I apologize if these are dumb questions, thank you for any help and of course publishing this project in the first place!