On Saturday, July 02, 2011 09:00:54 AM Jason Pyeron wrote: > You will either need many different batteries for the different voltages (1.2, > 3.3, 5, 12, -12, -5) or a DC ATX power supply (not cheap and not very powerful > until the 48V input variety) A company called PowerStream produces DC input ATX supplies for 12V, 24V, and 48V input, all with up to 500W of power. The 12V input page is at http://www.powerstream.com/DC-PC-12V.htm We have a number of their -48V input supplies in use. No, the 500W version in 12V input is not cheap.