Unless you are trying to drive your boat with electricity, then there isn't anything you can't do in 120 VAC and 12VDC with a small AC genset, a reasonable size battery bank- say 400 AH and a 2,000 watt inverter/100 amp charger.
Your DC wiring will be bigger than a 24V system, but there are really only two big amp consumers: the starter and the inverter. All else is 6 gauge or smaller.
And this system is the cheapest and easiest to make work. No DC/DC converters or changing out DC motors to work with 24V. Even solar panels can easily be used with 12V. Yes it takes a bigger amp controller and a size or two bigger wire, but the cost is small compared to all of the things you have to do to work with a 24/12V DC system.
And you have AC to drive your A/C.
Dreaming is fun, but practically and cost effectively it doesn't make sense to have a DC only system with 24/12 V.
David
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