Server converted power supplys.

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sureshot
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Re: Server converted power supplys.

Postby sureshot » 11 Sep 2016, 02:05

So its time I put together a variable test load for these monster power supplys. I can't or don't need a load of linear amps for testing, and its to expensive.

I thought lamps, but that's ok for a 100 watts testing etc any higher get daft with lamps. As I first attempt I'm going to use 50 watt aluminum clad resistors. I figure if I use 10 x 4.7R 50 watt resistors I will get a shade over 300 watts at 12 Volts, and each resistor will be disapating a little over 30 watts each. Rather than fixed load I was thinking switched divisions of 50 watts using toggle or rocker switches via high current relays to take the increasing load, up to the maximum.

I did think I might take this up to 500 watts for load testing these units, but can't see much call for that higher current rating. Might be wrong on that though. Now just to look out for a donor heatsink that will handle 300 watts maximum load, and using 120mm fans for cooling.
CB call. Shipwreck.

sec1223
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Re: Server converted power supplys.

Postby sec1223 » 11 Sep 2016, 07:30

Should be a good build
cant stand IGNORANT b******ds

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Re: Server converted power supplys.

Postby sureshot » 11 Sep 2016, 10:46

sec1223 wrote:Should be a good build

Hopefully.. For those units I can get up to 13.8 Volts or close to it, each of the 10 4.7R resistors will be disipating a shade over 40 watts each. But most units voltage will be somewhere in the middle on voltage. Just need a modest scope now to see how clean the outputs are under varying loads.
CB call. Shipwreck.


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