Thanks this is super helpful, I'm in the same boat as you. So if I just get a generic CAT5 cable with a RJ45 on one end, that'll go into the Sunsynk, but I'm not sure what pin 1, 2 and 3 are. The CAT5 cable I got is wired according to T568A, so what wires go to B/D and GND?
Any idea?
https://kellerza.github.io/sunsynk/guide/wiring#rs485-wiring