Go to menards or Lowes or HomeDepot and get a Peak Automotive power invertor. I got a 300W; 600W peak for like $35 on sale, and mine has been abused. I run 15 feet of ropelights and a laptop and sometimes cell phone too and it will do all this when its -20 in the car, all day long. So in my mind, can't really go wrong there. although the fan isn't very quiet anymore after 2 winters of constant use......
