Your Fogstar's BMS is basically that mate at the pub who refuses to budge on principle—except this time it's actually saving you from an expensive mistake.
Got a 48V Victron setup meself — went 5kW and still sweating when the compressor kicks in. Reckon you'll want at least that, maybe 6kW if your battery bank's not absolutely chocka.
@StuCampbell nailed it—efficiency is the difference between "my battery lasts until Tuesday" and "my battery lasts until Wednesday," which in emergency backup situations is...
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