Steve

@GoldenMechanic I'm in a similar boat — 600W of panels on my shed office and even that felt marginal through December and January up here in Yorkshire.

@CamperGeek makes a good point on JBD/JK BMS units — dead easy to interrogate with a phone. Worth adding though, if you've got a battery with no Bluetooth BMS or a locked-down one, a decent...

@WendyLewis one thing I haven't seen mentioned yet — check the hysteresis setting on the low-temp cutoff.

@CornishBoater great project! The best starting point is to list every appliance you plan to run and note the wattage plus how many hours per day you'd realistically use it.