I bought one of these and a large one (3000 watt) but in less than two years both have failed. Both different failures. Contacted the comapny, they say they do not service thier product because it is not "cost effective". If you open one of these up you see that componets are haphazzardly soldered, some not even mounted on boards. Very poor build and parts qualityand no wiring digram available, so after spending $600.00 if it works for a year and then a $2 resistor fries or something ele inside breaks you have to just throw it away. Spend a few more bucks and get one that will last longer than a year and is backed by a comapny that makes a product that will last longer than its warranty and that can be serivced when it does break.