I did mine a little differently than most, the only thing in the trailer working off 110 AC is the battery charger (6 amp). I also have an AC outlet in the galley just in case I ever need it.
I put a large boat battery in, and this last weekend as a test, ran all weekend without charging the battery and it did fine. Judging from how long the charger took to bring it back up to full charge, I'd estimate we used less than half of the battery capacity. We were using lights of course, a small TV for an hour or so each night, and a small fan in the cabin for a few hours each night.
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