Multiple Power Supplies

ratn9ne · 05-10-2005, 08:39 PM

anyone ever tried running 3 atx psu's 5 volt rails in series ? i want to get about 45 amps at 15 volts. i know i need to tie the power on wires to ground, but i dont know where or if i need a dummy load for the psu to funtion. People have told me if im using only the 12 rail i need a load on the 5.... so if i only use the 5..... does the 12 need a load also?

jaydee · 05-10-2005, 09:27 PM

If you run 3 5V supplies in series your voltage will be 15V but your amperage will not increase. IF you run them in parallel your amperage will increase but your voltage will still be 5V.

ratn9ne · 05-10-2005, 10:00 PM

yeah.... ima use psu's that are rated 45 amps at 5 volts. if it works, i will run 3 in parallel with another 3 later. i think 90 amps should be over what i need. im just wondering if computer power supplies will like this. switching power supplies are VERY complicated and might not like working together for some strange reason.

MadHacker · 05-10-2005, 10:45 PM

Quote:

Originally Posted by ratn9ne

yeah.... ima use psu's that are rated 45 amps at 5 volts. if it works, i will run 3 in parallel with another 3 later. i think 90 amps should be over what i need. im just wondering if computer power supplies will like this. switching power supplies are VERY complicated and might not like working together for some strange reason.

take 2 cheep power supplies and put them to gether in parallel and put on a load.
Smthing that you can afford to blow up

If it doesn't go to smoke and sparks arn't a flying it may be ok..

05-10-2005, 08:39 PM	#1
ratn9ne Cooling Neophyte Join Date: May 2005 Location: ca Posts: 2	Multiple Power Supplies anyone ever tried running 3 atx psu's 5 volt rails in series ? i want to get about 45 amps at 15 volts. i know i need to tie the power on wires to ground, but i dont know where or if i need a dummy load for the psu to funtion. People have told me if im using only the 12 rail i need a load on the 5.... so if i only use the 5..... does the 12 need a load also?

05-10-2005, 10:00 PM	#3
ratn9ne Cooling Neophyte Join Date: May 2005 Location: ca Posts: 2	hmm yeah.... ima use psu's that are rated 45 amps at 5 volts. if it works, i will run 3 in parallel with another 3 later. i think 90 amps should be over what i need. im just wondering if computer power supplies will like this. switching power supplies are VERY complicated and might not like working together for some strange reason.

05-10-2005, 09:27 PM	#2
jaydee Put up or Shut Up Join Date: Dec 2001 Location: Spokane WA Posts: 6,506	If you run 3 5V supplies in series your voltage will be 15V but your amperage will not increase. IF you run them in parallel your amperage will increase but your voltage will still be 5V.

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