The average camper air conditioner requires about 3,000 watts to start up, which equals about 23 amps. It takes an average of 2,000 watts, or approximately 16 amps, to keep the air conditioner running smoothly. The power levels for air conditioners are usually expressed as watts, not amps.
Air conditioners for campers typically receive their power from a portable generator. Some generators plug directly into the RV to provide power to the internal appliances. These generators come in 30- and 50-amp sizes. One 30-amp generator is sufficient for powering a single air conditioner, according to Camping World, though RVers should use a 50-amp generator to power multiple air conditioners or other large appliances.