I would suggest the better question is how little solar panel and battery AHs are needed to accomplish unlimited dry camping in very remote locations...
And like anything, if you repeat something endlessly, many people will actually believe it and do it...
We can get 120VAC and 20A (i.e., 2400 Watts maximum capability) for 20 minutes from our 3000 Watt Inverter using only a 100AH Group 27 LiFePO4 battery. Our daily depletion rate never exceeds 50AHs. We can fully replenish this daily battery depletion in under 4 hours using only 200 Watt solar panels. 20 minutes of operating time using 20A enables daily operation of all our short-duration 120VAC appliances which include our coffee maker, microwave oven, 2-slice toaster, toaster oven, toilet heated bidet seat and vacuum cleaner. And since any one of these appliances only uses a maximum of 800 Watts (i.e., only 33% of our maximum 2400 Watt capability), our actual operational time is about 1 hour.
Having an electric only compressor refrigerator in lieu of an electric/propane absorption refrigerator in a RV that doesn't always have a shore power hookup makes little sense to me. And then constructing a battery system to then power a compressor refrigerator or an AC system when shore power is not available makes zero sense to me. George Carlin probably explained this phenomenon best: