Good question to stress-test before you fill the thing. Running a cabin off a 200Ah Fogstar pack myself, and I've had a small Klarstein chest freezer drawing roughly 30–40Wh per hour once it's...
Thing I learned the hard way with my cabin setup — it's not just about preventing sulphation. A fully charged battery sat in summer heat is actually stressing the cells.
Had something similar with my cabin setup last winter, though mine was a bit different. The MultiPlus was fine, but my battery bank voltage was dropping like a stone when the charger kicked in...
The usage pattern thing @RustySpanner mentions is spot on. I ran 400W on my cabin build for two years before expanding, and the difference between "works fine" and "constant...
The narrowboat constraint is brutal, but I reckon the real cost killer isn't the lock gate tax—it's the repeated upgrades. Started my cabin build thinking a modest 10kWh lithium bank would do me.
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