on my 1980 35' globestar i have an ac unit thats supposed to work perfectly.i havent used it.how much power do they use?right now i have it in a friends side yard plugged into one of the bedrooms.will it pop circuit breakers or will i be ok?its starting to get hot and crappy outside so id like to use it if i could.and how much power do they use so i can give some money toward his electric bill or do they run off the 12v system?