Power line. Why didn’t I think of that. Ordering a puser at alie now. Thank you for all the responses.

In other news:
I made a plugin for the ct003 to get the data over to Domoticz without the need for a puser.

You can find it here: https://github.com/Haaibaai/Domoticz-Marstek

Do I really need the Ethernet version of PUser for this to work, can it also work with the WIFI version? My batteries are in my garage and I don't really want to connect Ethernet to the garage as it would involve drilling a hole in the ground.