@LazyNomad one thing nobody's mentioned yet — thermal cycling on a boat is genuinely brutal. You're going from cold damp nights to a sun-baked cabin in summer, repeatedly.
Great points from @Sam1965 and @TimKnight already. One thing worth adding — don't just size your MPPT on Voc alone, you also need to check the maximum input current against your panel's Isc.
Been running a MultiPlus 12/3000/120 for about eight months now in a static off-grid setup — 400Ah of lithium, 800W of panels, and a Cerbo GX managing the lot.
MarshHermit | 847 posts
@RetiredNurse43 completely normal for this time of year, don't panic! Two things working against you simultaneously — AGMs lose a significant chunk of their usable capacity...
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