Originally Posted by JustinThyme

Server Power supply is the way to go.
I bought a Hitech 400 watt x2 charger that requires 60A power supply. There are only a handful of commercially available power supplies, all of which are in the $200 range.

So for $16.95 including shipping from ebay I converted a HP PROLIANT DL580/ML570G3 RPS Redundant Power Supply into a 12V 73A charger power supply, could get 100A with 240V but Ill stick with the 120V.

If you can solder it takes all of 15 minutes to convert with no opening of the power supply. Instructions found HERE

Best $16.95 I ever spent!
This power supply exceeds the specs on the commercially avialable power supplies for RC charging by a long shot and it saved me $183.05, paying for my Hitech 2 channel 800 watt charger.

This particualr supply is fairly small compared to the RC supplies of this output and far smaller than most other server power supplies.