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How long is a piece of string?
 
First, you're welcome here.
If you're mainly interested in running the standard 13.5 btu ac , you could get by with a >2k watt inverter provided the ac has a soft start capacitor. Otherwise you'd need something in the >3k watt neighborhood. That model also comes with an optional high efficiency 11k btu w/softstart rooftop ac ( power pkg. upgrade). So that would be relevant as well.
 
Get one as big as you can handle and carry. If you want to run everything like shore power and you have a 30 amp camper, you need a 4500ish with at least 3600 continuous. Mine is 4500/3750 Westinghouse. But that is a big unit. Some buy 2 smaller ones and use 1 for general power and both to run the AC and larger loads. That would be a couple of 2200's at least.
 
Better too big than too small..put a load on too small, trip breaker..go outside with flashlight and reset..at 2 am
 

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