I agree with tat,small AC inverter is easiest solution. I drove truck all over the country for month at a time. Usad to run my laptop and keep batteries charged for other things all the time. Doesn't cost as much for a small inverter as it would for special adapters and you can use it for about anything that doesn't require a high wattage to run. You have 120v AC right there. You can get inverters at Radio Shack,Walmart,Sears ad lots of places.