Good quality, cheap and VERY strong PSU
Posted by Skunky
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Good quality, cheap and VERY strong PSU March 09, 2013 02:23PM |
Hello.
I've been one of those who jumpt on the PC PSU bandwagon, and i must say that was utterly crap. not only did i pay around 60$, it was a 500w PSU that should have been able to handle the load easy.
Well it was very bad, if i have to be honest. Bought 3 2in1 12v car bulbs and attached them all to the 5v line to create load (without load it would shut of when turning on the heatbed) and i still just merely got over 12v.
So i thought "what kind of powersupply is made for big loads and running 12v?" well ofcourse Server psu's !
after some search i found this one: [www.pacificgeek.com] - It's a 1200W IBM blade server redundant PSU. Theese babyes have a massive 98A load capacity, and the more load, the more voltage ! - mine goes from 12,4 in idle, to 12,44 when the printer is running.
P.s. the picture on theyr site is only a picture for the picture sake, it is NOT a picture of the actual PSU.
So I've ordered this one, and thought the 2xPSU meant 2 PSU's in one encasing... well it was 2 physical PSU's with BOTH 1200W capacity !
They where extremely cheap (you can easily find them for less then 40-50$), so i thought it was a very good deal !
Now after figuring out which pins to short, for it to turn on, i faced another problem. after 1-2 minutes it would turn of, without even having load.
"Back of the PSU. Yellow wire = turn on wire"
Thought maybe some sort of fail safe in case no load is there, so i tried with load, same error. tried the other PSU, same thing happened. Mate of mine said it might be because of the lack of cooling. At first i was skeptic, since it would only get a bit warm before turning off, but trying out his theory showed he was right. Just a normal 60x60 fan on one site of the PSU, and all problems disappeared. It was suddenly ROCK stable !
In the end i ended up with 2 PSU's both capable of handling nearly 100A, both cheaper then any other PSU i could find with just half the capacity and i got two for the silly price of 40$ (wich would then be just 20$ / piece)
And they can be set in series, to create a 100a 24v PSU. But BEWARE ! they have ground etched to the casing (checked with voltmeter myself), so they MUST be isolated / have ground connection removed from the encasing. touching both, while they are connected in series may electrocute you (at least that is what I've read)
Hope this helps someone. I will certainly keep using these PSU's in my future 3D printer builds !
I've been one of those who jumpt on the PC PSU bandwagon, and i must say that was utterly crap. not only did i pay around 60$, it was a 500w PSU that should have been able to handle the load easy.
Well it was very bad, if i have to be honest. Bought 3 2in1 12v car bulbs and attached them all to the 5v line to create load (without load it would shut of when turning on the heatbed) and i still just merely got over 12v.
So i thought "what kind of powersupply is made for big loads and running 12v?" well ofcourse Server psu's !
after some search i found this one: [www.pacificgeek.com] - It's a 1200W IBM blade server redundant PSU. Theese babyes have a massive 98A load capacity, and the more load, the more voltage ! - mine goes from 12,4 in idle, to 12,44 when the printer is running.
P.s. the picture on theyr site is only a picture for the picture sake, it is NOT a picture of the actual PSU.
So I've ordered this one, and thought the 2xPSU meant 2 PSU's in one encasing... well it was 2 physical PSU's with BOTH 1200W capacity !
They where extremely cheap (you can easily find them for less then 40-50$), so i thought it was a very good deal !
Now after figuring out which pins to short, for it to turn on, i faced another problem. after 1-2 minutes it would turn of, without even having load.
"Back of the PSU. Yellow wire = turn on wire"
Thought maybe some sort of fail safe in case no load is there, so i tried with load, same error. tried the other PSU, same thing happened. Mate of mine said it might be because of the lack of cooling. At first i was skeptic, since it would only get a bit warm before turning off, but trying out his theory showed he was right. Just a normal 60x60 fan on one site of the PSU, and all problems disappeared. It was suddenly ROCK stable !
In the end i ended up with 2 PSU's both capable of handling nearly 100A, both cheaper then any other PSU i could find with just half the capacity and i got two for the silly price of 40$ (wich would then be just 20$ / piece)
And they can be set in series, to create a 100a 24v PSU. But BEWARE ! they have ground etched to the casing (checked with voltmeter myself), so they MUST be isolated / have ground connection removed from the encasing. touching both, while they are connected in series may electrocute you (at least that is what I've read)
Hope this helps someone. I will certainly keep using these PSU's in my future 3D printer builds !
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