Quote:
Originally Posted by snellemin
I figured I post this up for you guys that want an affordable 12.5V 47A capable power supply to power your chargers.
The model number is power supply in question is 321632-001, DPS-600PB HP 575W Power Supply Proliant DL380 G4. All you need to do for the PSU to "Turn on", is short 3 connectors. Basically two hot wires to ground. No load resistor is needed.
When you look at the back of the PSU, you'll find 4 blade plugs. The two on the left are ground and the other two on the right positive. In between the blade plugs, you'll find a set of 12 pin connectors. You'll see a pin that is shorter than the rest, which I call pin 6.
1 2 3
4 5 6<---short pin
7 8 9
10 11 12
Connect 6 and 10 to 8(ground). I believe pin 5 is ground as well. Note that the PSU fan will turn on when you connect it to the AC line. The fan will speed up, once you short the 3 pins together. I opted for plugs to the pins, but you can use a switch instead. You can use servo leads as well.
Solder your power wires to the blade pins and have fun charging.
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I picked one of these up for $25 shipped and it came in today. And of course I opened it up as soon as I got home. Bad news is that there is no adjustment pot inside; I even looked under the heatsinks. The good news is that I was able to boost the output to 12.95v. Not much, but still some.
All I did was create a voltage divider consisting of a 220 ohm resistor and a diode. Tied the + output to the resistor, the other end of the resistor to the anode of the diode, and the cathode of the diode to the - output. I then tied a wire from the diode/resistor connection to pin 5, which feeds ~0.7v to pin 5. Looks like pin 5 is not a ground, but a feedback line to boost the output if there is voltage drop due to heavy current. This resistor/diode trick just tricks the PS into thinking it needs to output higher voltage.