Cars actually have huge A/C systems. You could run a big 13,500 btu RV A/C on 1800 watts if you could get past the 2800 watt starting current. That is less than 3 hp. My 1800 running watt Westinghouse generator will run full load for probably 8 hours continuous on 1 gallon of gas. So 1/8 gal per hour. I would hope a built in accessory drive on a cay would do better than that.
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