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Given that you’ve already done the work, I wouldn‘t be changing it now. Going 24V will let you run smaller wiring and increase efficiency to some small degree, but it also adds complexity, decreases efficiency every time you’re converting from one voltage to another and will also decrease reliability (because you now rely on those DC-DC converters). Also keep in mind the costs of swapping motors and switch gear on things like winches adds up very quickly.
All of that said, no regrets here converting my sail boat to 24V. I went 24V so that I could run my dive compressor off my inverter and solar (2.6kW load). I’ve also swapped my windlass and winches to 24V. They’re a hell of a lot stronger now, but the cost was obscene. In hind sight I would have just pulled the 12v motors off my winches and gone manual.
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