Yup, you only need one 125ah. I run 4 Solix 12s, Mega 360, 2 Raptors, hydraulic jack plate, 2 Ethernet boxes, livewell, boat general power, and cranking the big Merc 250 V8 and after an 8 hour tournament am at 59% with very little time running the Mercury Outboard for alternator recharge.