Originally Posted by tluehrs
Our Holiday Rambler Vacationer is 30 amp and the generator is an Onan 5500 and when we are on the genrator and turn on the microwave, the AC and Microwave kick off. RV generator will not run the air cond. and microwave at same time. Any ideas?
I assume all works fine on shore power. That should suggest the breaker that is tripping is the one on the generator and not the main panel breaker. A 5500 watt generator is capable of supplying more than 40A of service, so the generator shouldn't be overloaded.
Here's where I'd look, based on my assumptions above.
-- If you have a voltmeter, use it to measure the generator voltage when the fault occurs. Ideally, you have one that will hold highest and lowest readings. If the voltage drops to the 105V range, it could be the generator's voltage regulator.
-- As stated by others, check the circuit breaker. Again, I assume it's the one on the generator that is tripping.
-- If the generator's breaker is a 30A breaker, and it should be 40A, it could just be product aging. Your AC compressor and fan tend to draw more current over time, especially at start up. A 1500 watt microwave, an AC unit, the battery charger, and a couple of lights puts you close to 30A. If you have an electric hot water heater, you are really pushing 30A service. I'm guessing hot waterf is propane.