Right, I've been through this exact nightmare on my converted horsebox. The moisture issue is real enough, but on a narrowboat you've got it worse than most of us.
Here's what actually worked for...
Brilliant timing jumping in at the garden office stage. I did the same with my van conversion a few years back—started simple, learned loads, then knew exactly what I actually needed rather than...
Had something similar in my van conversion last year — proper frustrating. Since @ForestJenny's already mentioned cell balance and @Wez1961 covered the shunt, I'd add one more thing that caught me...
The inrush thing absolutely caught me out in my van conversion. I'd calculated everything meticulously — kettle draws 2.8kW, microwave 1.2kW, never running together — so I thought a 3kVA would be...
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