I bought two of these breakers but don't know if I need two as I have two Eg4 inverters and two batteries. Should I install a breaker in each positive 2/0 cable for each inverter? I think this would be correct. also cannot find a suitable plastic din box that's deep enough for these. I tried for many hours today moving the lugs around and drilling holes at different heights and these boxes are just too shallow. I don't see how anyone got 2/0 cable to work in these boxes.