We just purchased a 2002 Commodore 2765 it doesn't have a generator but we would like to be able to run some of the features when we are out boating ex. micro and tv. Can we install an inverter to run the appliances? What size would we need to get? Can we get a generator that can be installed in the engine compartment that won't cost an arm and a leg? What size do we need? Our boat does have an air conditioner.