The guy in my primary club charges his LiPo batteries on two 12v deep cycle marine batteries. If you can get you hands on a 24v ps, you will be in fine shape. Steve tells me (and it is so) the Hyperion chargers work with voltages from 12 to 28v. I wish I had a power supply like that. Fwiw, take look at hyperion's web page (and how-to manuals) to see their voltage requierments.
Hoping the above is helpful,
Gary