The generator worked great out of the box. Powered string trimmer wonderfully. I tested it on my RV and it ran the microwave and brewed coffee at the same time. The first camping trip out was at elevation of 9200 feet. Coffee maker and water pump sent unit into overload. I hope a second parallel unit will be sufficient. I am not sure if it would run a/c even at home (5800 feet). Plan on buying a second unit if going to use at higher altitudes. Thankfully, the cost is reasonable. Quiet enough, but still noticable.