It does NOT mean how large the Inverter is. It is the amount of Receptacles and appliances connected thru the Inverter. Most have 50 amp RV's that have large Inverters. The downstream receptacles and appliances are run thru 15 and 20 amp breakers from the Main 50 amp Breaker panel. If you have an Inverter, the power FROM the 50 amp breaker panel will have a 30 amp breaker going TO the Input of the Inverter. Large Inverters will have 2- 30 amp feed circuits. The limitation of the circuits is the output Breaker/s AT the Inverter. So, if you ran ALL wall plugs and the Microwave AND the Residential refer thru the Inverter and then plugged in a Coffee maker and a Skillet and also ran some ceramic 120 heaters in cold weather, you would easily overload the Breakers at the Inverter and trip them, OR the branch breakers (15/20) back at the Main Breaker panel. So, the OEM's wisely decided to power just certain wall receptacles. IF the Inverter is 2500 or larger, they will have a Bedroom/bath/kitchen receptacles powered by the Inverter and also have receptacles in those areas supplied directly from the Main 50 amp breaker panel, so you can run higher amp appliances without overloading the Inverter and Inverter breakers. The plain fact is--- most RV'ers are just plain Ignorant of power usage and draws on their RV's. So, the OEM's have to do that work for them. They design the limitations to prevent problems in use that could burn or overload circuits. They install EMS systems and branch circuit Inverters and such. It is a shame that OEM's do not label receptacles that are Inverter powered. Some do, but most do not. Doug
