Bought my '94 Tige SLM 454 efi that came with a smallish 600cca Battery. Boat also has a 1,000 amp watt stereo with single 10" Sub and 4 mids/high speakers. She has always started but rarely with much authority. I'm thinking the 454 needs more juice to turn over quickly. Nothing like getting to the water and loosing confidence from your crew when the boat sounds like it might not start. I would also like confidence to run the stereo occasionally at loudish, but not lake deafening volumes for maybe a 15 minute period. Between the Big Block, Stereo, Blower, Perfect Pass, and frequent starts-stops and short run times seems a boat battery does not have a easy life.
I have read that it may be better to get a single strong battery like the Optima Bluetop D31M AGM as this is friendlier to the alternator than a duel batter set-up? I also like the idea of keeping things simple with fewer wires, fewer connections as well as maximizing storage space. The battery is located behind the observer seat, an additional battery directly interferes with closed bow storage.
I would appreciate info on your favorite battery setups and why?