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Are you sure that the batteries are hooked up correctly? 6 VDC batteries or 12 VDC batteries.?
Is the shore cord 30 amp or 50 amps? Any adapter being used on the cord?
Are you sure that the problem isn't at the power source? Take a voltage reading there on each leg to the neutral and see what you have.
That might make the A/C work too hard. You usually need 115 VAC as a minimum. What else do you have on?
Just checking back in to see if you still needed some help with this problem?
I think maybe it is too low for running both of those on a very hot day. Perhaps a hard start kit would help and having no other AC uses on. And you are quite weclome!