I run them all of the time. I have a 1200 watt one in the back of the truck which runs a tv and a playstation. I keep an 800 watt one in the front of the truck which runs a computer and charges cell phones and the camera battery. I haven't just tried it a few times, I use them so often that one I bought in 2001 finally died on me. Never had any dash fires/wire problems either. Both invertors typically run at the same time from different cigarette lighters in the truck; I've never had a bit of trouble. Now I will say make sure to get one with two plugs. I made the mistake once of buying a few inverters I never use that have only one plug.