Inverter size

[Lbickham]

So I ordered a Dometic 15000btu roof air condition Saturday, and I am trying to find an inverter. According to my research, that unit use 3300 starting watts and 2000 continuos watts. I would like to be able to run that and a mini fridge/freezer full time off of shore power or battery's. Do I need like a 4000 watt inverter?

[Timelord]

Given what you said, 4000watts should be about right, though more doesn't hurt. You will also need one helluva battery bank. You may also wish to go with a pure sine inverter as the cheap modified sine wave inverters will make your equipment run hot/less efficient.