Deep cycle battery for AC?

A 12A A/C will draw about 130A from a 12V battery. 2 6v deep cycle batteries at 220Ah can supply 130A for 50 minutes to the 50% level. That works out to about 20 6V batteries for 8 hours and about 1,400 lbs.

Run the gen all night.

Or you can set up a 48V lithium battery set which will be less weight and can discharge to 20%. Then run the gen all day to recharge. And the cost will be $$$$$$$, if not more.

What @rjsurfer said.

I came across a youtube video of a guy who set up to do that, but he was running a 5,000 btu, energy star AC, not the 13,500 btu unit on your camper. He did it with 600 watts of solar JUST FOR THE AC, 1100 watts to run everything else he wanted to run, and several Lithium Iron Phosphate batteries. Unless you downsize your AC, you are going to need a minimum of 2,000 watts of solar, and a dozen or so of those lithium batteries. Merely buying another flooded cell lead-acid deep cycle battery isn't going to do anything useful for you.

You're talking about a $6,000 plus investment in Lithium batteries, solar panels, inverter, solar charge controllers and a complicated mess of wiring to run an AC for just one night of cooling. And if the sun isn't shining the next day you better have a $2,000 generator to recharge your batteries.

Ron W.

You wouldn't be able to carry enough batteries to handle the load.