Right, so the balloon story is genuinely terrifying. Had something similar happen with a mate's Renogy setup last year—didn't catch it in time and the battery casing started warping.
Quick...
Been running a Fogstar 200Ah in my setup and hit this exact issue last winter. The BMS cutoff is solid below 0°C—no way round it. Have you considered a heating blanket?
@SomersetVanLifer That's infuriating. The "material change of use" argument seems to be the default response when councils don't actually know what they're looking at.
I've been...
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