1 Topic by Tomek (edited by Tomek 2013-05-26 19:56:09)

  • Tomek
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Topic: Ultra compact 12V 48A power supply $30 + $5 shipping

Hiya! I bought four IBM 585W server power supplies off of ebay for a project a long time ago. FRU-39Y7169.

Dimensions: roughly 12"x1.6"x3" . Even other server power supplies of a similar rating tend to have a density 35+% less than these. [so they're not as compact.]  These used power supplies easily have $100-200 in parts and labor in their production, but they're dumped on the used market because server centers are constantly upgrading their equipment well before it's dead.  With a bit of information online, heavy soldering, and time, they can be modded as powerful power supplies for your solidoodle, RC battery charger, or whatever else you want 12V for.


I ended up modding all of them to output a stable 12.5V.  Basically this involves taking apart the case, desoldering a few pins, and soldering (with a high wattage iron) my wires on. It also involves another small wire that goes to enable the output.

I lost one of the power supplies (it was either dead from purchase, or by my modding) by trying to be fancy and get the power supply to output 14.5V (that particular modification doesn't seem to work with the ones I have- after the first I settled on 12.5V as the output.)


Long story short, I am selling two of these power supplies to raise money for the E3D-online.com hot end that I bought :-).

Specs:
12.5V, 48A
1 set of super flexible 14awg silicone covered wires 11" long to go to the Sanguinolo screw terminals
1 set of super flexible 10awg silicone covered wires about 20" long for whatever high power application you want
1 16" ribbon cable loop that is brought out in case you want to splice in a switch for a low-current on-off switch (this line if broken will turn off the output of the power supply, but it can be a low power cheap switch because the current doesn't go through it.)

I can add 4mm  bullet connectors on the end or XT60 connectors, female or male, free upon request!


I can upload photos tomorrow! Mine tucks nicely to the side of the SD2

I am asking for $30 OBO each. If there is interest in this I'll also mod my HSP power supply that is a little less power dense, but equally ultra-powered.

2 Reply by Tomek (edited by Tomek 2013-05-25 21:31:35)

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Re: Ultra compact 12V 48A power supply $30 + $5 shipping

I thought: Why wait until tomorrow to post photos?

First file shows the power supply next to my SD2. Fits pretty neatly! (the AC power in sticks out a little though, so it's normally an inch pushed back- but I was using the cord elsewhere today.)

Method 1 and MethodPt2 show the method the wire is secured to the power supply. After I made the first power supply, which I kept for myself, I figured out a better method of attaching the ground and positive wires to the power supply. The negative wires have PCB points on the underside and so there's no place to fit wire between the board and the case (you end up squishing the wires- that's what my first version is that is not for sale BC it's inferior but works for me.)

I ended up breaking the output connector so I can remove the positive pins (they're too close to GND to be safe to keep the wires soldered next to each other), and solder the positive wires directly to the PCB board. I then protect them in kapton tape for extra measure. Then I soldered the black wires to the regular pins, which are now free of potential to short again positive wires.

The shiny copper photo just shows the insides of the one charger that isn't working (of the four I originally started with.) I can throw it in with the sale if someone wants it I can get the cover back on, it'll just add a couple bucks to shipping. In theory i'll end up saving the inductors and heatsinks for future projects, but in actuality am not likely to use it.

http://www.soliforum.com/misc.php?action=pun_attachment&item=2160
http://www.soliforum.com/misc.php?action=pun_attachment&item=2158
http://www.soliforum.com/misc.php?action=pun_attachment&item=2159
http://www.soliforum.com/misc.php?action=pun_attachment&item=2157

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CopperSoShiny.jpg 399.69 kb, 1 downloads since 2013-05-25 

Method1.jpg
Method1.jpg 431.88 kb, file has never been downloaded. 

MethodPt2.jpg 558.32 kb, file has never been downloaded. 

SD2SizeComparison.jpg
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3 Reply by Tomek

  • Tomek
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Re: Ultra compact 12V 48A power supply $30 + $5 shipping

I will limit the cost of shipping in continental U.S to $5. So you can call that $30 + $5 shipping, or $35 + free shipping, whatever.  ^_^