Well I called Batteries plus and this is what they said, the inverter will draw 3000 watts + 10-15% for loss in conversion. So that is a 27.5 amp draw on the battery if used full draw. which I will not be doing as the fridge will cycle on and off. It will draw 1200 watts running and I am not sure on start up.

Sorry about the bad link for the battery. Here are the details: Exide Deep Cycle Battery: Orbital Select; 12 Volt; 750 CCA; 950 CA; 100 Minutes Reserve Capacity

So if I am doing my amp hour conversion right it will provide 37.5 amps an hour over 20 hours. I would probably use 2 batteries in parallel to double the amp hours and only run the generator to recharge the batteries as not to draw attention. :-)

Am I wrong with my math?

Dave