Microwave off Inverter. Volt drop with 3 batts parallel

lawrosa wrote:
Plus I dont know the effects of ampdraw from the RV batts down the wire of 7 pin 20 ft of maybe #8 wire.

Horrible. :M Forget the Bargman cable and use heavy gauge booster cables, the heavier and shorter the better. I'd prefer to use at least 2 gauge but any sold around here are too long and too expensive so recently bought a 16' 4 gauge set but may cut it even shorter to reduce voltage drop even further when I load support my trailer battery with my truck.