So people are a little wary. I bought the voltage transformer as an inverter with pure sine wave. I get a trapezoidal inverter. To ensure that no motor, no drill and no refrigerator is running. When I complained I got the phone snippy answer: Then send the part back stop. I keep the inverter in order to heat a water tank of a solar system. This is excellent and the price / performance ratio is good. But the service and the customer orientation must Maxstore a little work.