Very nice!! The username is the same: https://github.com/poldim. It's the same on reddit, discord if you want to chat...I have a custom integration for HA on github now. It has good functionality at this point when using TCP/IP. Should not be too hard to make it work with RTU, which is what I could use some help with. If you are interested in working on it let me know and I will give you access. Just send me your github username.
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How are you converting from RTU to TCP? The little black MAX485 adapter on a Pi to just act as the TCP/IP gateway?
IIRC, your NR flows were pushing the data to MQTT?
BTW, I took some time and cleaned up the SunSynk register map file. Use as needed: https://docs.google.com/spreadsheets/d/1JKPSJ3RWAkGTsEz0LB08PZZ-XCBtGfTnJy5yqc7GmP4/edit?usp=sharing