I have recently purchased a computer server power supply to convert to power all of my chargers.I was looking to buy a nice power supply that could handle 2-3 chargers at once.When I saw the prices ,I knew I had to find another way.
I knew I wanted at least 40 amps,possibly 60 amps.
I started reading many forum topics and decided to convert a 1200 watt server computer power supply.
I have done a few pc power supplies ,but wasn't happy with the performance.
I purchased 2 1200 watt server power supplies(PSU is what they call them)
These supplies are super reliable and are designed to run all the time.
These supplies are rated at a max of 75 amps@12 volts with a 100-120V ac input.
I got them on ebay for $34.99 shipped for the pair.
These were out of a HP PROLIANT DL580 G5 server.
model number dps 1200 fba
I only had to solder a 560 ohm resister jumping pins 33 and 36
Then soldered 10ga power and ground to the long contact pads,then connected a banana plug terminal and 12v led light.
I then encased the whole thing in lexan to keep out dirt and such.

output was 12.36V with no load
12.28 with 10 amp load
I charged a 4s turnigy lipo with my Icharger set to 15.5 amps.
power supply performed perfectly.
I will test this power supply fully on 3 chargers at once this week.
I'll report on my progress in the near future.
Here are the pics.