Ok A/C. ON my motor home (Which reminds me A/C maintance (on my car) is something I need to do) when Driving I normaly use only Dash Air. however if it's August... Well. sometimes dash is not enough Then I use "Onan" air for want of a better name (the Roof A/C's powered by my ONAN)
No battery power...generally speaking. Will not even run the A/C in fact it's not set up to power them. and even if it was you would need over 3,000 watts of invwerter and a much bigger alternator than your vehice has to keep up with it (like 400 amps or more of alternator).