48V is the right call for a cabin, yeah. Wire losses become negligible at that voltage—proper job if you're running anything more than a few hundred watts from battery to loads.
Where you'll see...
Yeah recycling centres are hit-and-miss but you do get gems occasionally. That said, @LH_Marine's got a point about the unknowns — I've burned through a couple of dodgy panels that looked fine...
Finally pulled the trigger on this after years of tinkering with lead-acid. Got tired of the weight and nursemaid routine, honestly.
The setup:
600Ah LiFePO4 (Fogstar cells, four 100Ah modules in...
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