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OK - sorry for the rookie question which I'm sure is beat to death, but I could use some feedback as to whether my math is correct. I want to know that if I use X watt hours in an AC device, then how many Ah are being used from the 12v battery? My killawatt meter measured my 120v fridge...

System is 2x100Ah 12v AGM batteries (bought new 2 years ago, stored unused properly/regularly trickle charged but not constant, only installed in the camp trailer last week), 2000W Renogy inverter. Under a rather heavy load (hairdryer), pulling 1300W, voltage on the batteries drops from 13.6...