I got a big metal box lookin thing from Radio Shack that converts A/C to D/C, I used it for a while to power a couple high current car amps. Power inverter...converter...I always get confused. Either way the one I have is 10 amps and it powered some very large amps just fine. I'll try to look at it when I get home and post the stock number or whatever.
Edit: got bored,
this might be what I have at home but I can't tell because there is no picture.