Thanks for the reply. Unfortunately I will return this to Costco as soon as I return from my trip. The generator starts up easily and runs smoothly until it gets a load, any load, including one that is only 400 W at which point the breaker trips. The generator still runs but it doesn't supply any power. I borrowed a gen to make sure it wasn't something in the camper tripping the breaker and it is not. I bought the gen to charge batteries when needed but also to run a 900 W microwave which it can't do.