So I have a Sunny Boy 3600TL-21 which was installed in 2017 and uses the basic built in SMA system that sends data to SMA and then you access it via sunnyportal.com - the more modern inverters use SMA Connect which has a Home Assistant intergration - took a while to figure out the difference, but it should work.
In the meantime I may have to use a packet sniffer to extract live data from the feed from my inverter and sunnyportal.com … 