Just bought a Champion Inverter Generator 2000 watt for the camper . It is very quiet 52DB's and carb complainant for EPA standards .It is also a stackable unit so two can be run together to double the wattage output . It will only be used as a back up to the system . Its a 4 stroke and will only run at the rpm that it needs to produce the amount of electricity that is demanded at the time .