I've been thinking of buying a more powerful inverter than the cheap 400 watt Coleman one I have (got it for free after rebate, usually retailed for $30-40, I think). I doubt it puts out a true sine wave. I'm worried about a future power failure that spans more than just a few hours. I had one a few years ago that lasted >48 hours. I was thinking that if I really needed to, I'd clamp it onto the 12 volt battery of my Prius while Prius is in READY mode. There are a whole bunch of threads like Looking for an Inverter to use with my Prius | PriusChat. I'm concerned about the statements like below: I don't care about electrical noise as long as it's not damaging. Eek... I've run my laptops and 2 others (not mine) off the aforementioned Coleman inverter and they seemed ok. I sure hope I didn't damage the chargers of other people's laptops. I also have a whole bunch of UPSes and none put out true sine waves. All are from APC and I believe they all put out a stepped approximation of a sine wave. So far, nothing's been hurt by their output yet (computers, TiVos, routers, cable modem, external hard drive w/wall wart for TiVo, external DVD recorder, etc.) I do worry a little bit now if I were to run my laptops off of them in a power outage... From scanning the other threads, even though my fridge draws ~100 watts when running, my 400 watt inverter (claims 800 watt peak for short bursts) may be insufficient to start and run my fridge. I also am not sure how many watts it pulls when its in its auto-defrost cycle.