Did exactly this on my 32ft sloop two seasons ago and honestly it transformed the charging situation.
The stock alternator was doing a half-hearted job — wandering around 13.8V and calling it done...
Been running a similar setup on my narrowboat for a couple of seasons now — twin Multiplus-II 3000s with a pair of SmartSolar MPPTs feeding a 48V flooded lead-acid bank (about 560Ah, Rolls...
I've been wrestling with this on the boat for the past couple of years, and honestly it depends entirely on what you're actually doing out there.
When I first set up, I thought 400W would be...
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