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As reference, this 20,000 BTU/hr 12 VDC air conditioner claims to only pull about 96 Amps at 95 F outside temperature. I have no idea of cost or how good it is.
That’s about 1,150 Watts, which for 20,000 BTU/hr is an excellent EER of around 17. Compared to standard RV A/Cs plus inverter, a unit that efficient should be able to extend cooling time by about 50%. That’s the kind of system integration these motorhomes need, except that 20,000 BTU/hr A/C is way too large for a well-insulated van (unless A/C can run slower which makes it more efficient still).
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