2 group 24's. Trailer only came with 1 group 27, but I had these 2 old 24's, s I added the new box (white) then made an extension for the vent out of the PVC pipe. We hardly ever plug into power. Have a Honda 3000, and will hook up solar panels when I get a new shed built. Even thinking about a wind turbin also.
No where close to any hook ups.