Hi @HugosDad
Any chance you could provide more images or a wiring diagram? Planning to do exactly this but can’t really make out all the details from your image, looks like you are powering the Pi from the inverters COM-port?
I guess there is some RS485 board under the Pi on the image? Since it looks like the red and yellow wires are going there.
I also see a purple and blue wire, can’t really tell where those are going.