blw2, you may be interested in seeing some of these small Dometic A/Cs which start at less than 5,000 BTU/hr. Unfortunately they seem to only come in Euro electrical spec, although they offer a 12-Volt kit (I'm assuming that's nothing more than inverter to run them off batteries). The smallest at 3,400 BTU/hr only uses 430 watts (not very good efficiency but small size would be nice to run off large battery bank at night to cool bedroom when generator is not allowed).
https://www.dometic.com/en/se/produc...ioners-for-rvs
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