View Full Version : Power supplies (running other things off them)

28-05-2004, 09:44 PM
hey guys

this doesnt have much to do with computers but here goes anyway. i was wondering if you can run somthing that was designed for a car off you computer power supply, i am know that you have to get the right voltages, but i dont know about current. i am looking to buy a travel cooler/warmer from DSE and i want to use it in my room (i live in a student village in hamiton) i want to know how much current it will draw, and if there will be too much current (or not enugh) coming out of the computer power supply

thanks for any help

you can see this travel cooler/warmer here:


cheers James

28-05-2004, 10:02 PM
Try this link (http://www.dse.co.nz/cgi-bin/dse.storefront/40b6ff440039ff462740c0a87f9906f2/Product/View/M4500)

Note: DSE links are too long to paste onto the forum, they break up halfway :D

You can get 240V/12V DC adapters that have a cigarette lighter socket on the end to plug these type of things into. If not at DSE, maybe someone like Repco or Supa Cheap Autos.


28-05-2004, 10:18 PM
It draws 3 Amps, which is no problem for a PC power supply. Just gat the 12Volt connection, may not go too well on the 5Volt one :)

29-05-2004, 09:34 AM
3 amps? that too huge for my powersupply...

Billy T
29-05-2004, 11:49 AM
I don't think so Growly, the 12 volt supply on a PC power supply should handle that easily. From the figures below you will see that an ATX psu is able to supply up to 18 amps at +12 volts (depending on the overall power rating).

Note also that there is a minimum current requirement for the 12 volts otherwise the supply will not operate correctly

DC Ouputs:
+5v 35A , +12v 18A (min .8A), +3.3v 28A, -5v .5A , -12v 1.0A, +5v SB 2.0A. These are all maximum ratings apart from the +12 volts.


Billy 8-{)

Graham L
29-05-2004, 03:31 PM
The Peltier element is probably designed to run on a "13.8V" supply rather than 12V exactly. It won't hurt it, but it will have a bit less grunt--- some I've seen figures for work best at 15V.

You might be able to adjust the computer supply to give more volts... the regulated supply is the 5V one, and the others go up and down with that.

29-05-2004, 07:56 PM
thanks guys

i think i will purchase this travel cool/warmer and run it off my old ATX psu. you all have been a huge help, a big thumbs up to all of you :D

thanks again