^^ it'll run forever if the engine is running.... guess that was a typo?
most modern little fridges are about 200watts, which is 16amps at 12v
so a big ish 80amp hour battery will last 5 hours if you drain it flat... but you'll kill the battery by doing that.. and there'll be some inverter losses etc... so call it 2 hours
but that's 2 hours of run time... and the compressor will only run for a few min out of every hour...
in my camper I've got a 240volt under counter fridge freezer I'm going to run via an inverter... plan is to plug it in when I can, and the rest of the time just run it when the engine is on.... set it to min. temperature so it gets nice and cold too
