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The beauty of this unit is, it's output is true sine wave, power draw is nil while simply just hooked up. It is basically a DC motor that turns an AC generator. The DC motor automatically kicks in when a load is applied and turns off when the load is removed. I have one currently attached to my PSD. As such, the batteries get a chance to recharge between each successive demand. When the electric goes out, it is great for a fridge or a window AC unit. The truck at idle is more than capable of keeping the batteries charged when used in this fashion.