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PSU only giving ~4 amps on 5v rail?

post #1 of 7
Thread Starter 
Messing around with a few peltiers that are rated for 5v and ~13 amps. Problem is, when using some older power supplies that I had laying around, which are rated at 30 amps on the 5v rail, I can only get ~4 amps out of the 5v rail.

Any clue as to what I'm doing wrong? Or just a bad psu?
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Sigma
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post #2 of 7
Cross-loading.

You need to place some load on the +12v rail for the other rails to operate properly.
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Once again...
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post #3 of 7
Thread Starter 
about how much?

Running 3 fans on it doesn't do the trick (13 watts).
Edited by stalker7d7 - 5/14/14 at 8:47pm
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by stalker7d7 View Post

about how much?

Running 3 fans on it doesn't do the trick (13 watts).

Nor does 3 fans and an hdd (26 watts)
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Sigma
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post #5 of 7
Are you also loading the 3.3v?
In some powersupplies the 5v and 3.3v are linked.
post #6 of 7
Thread Starter 
Quote:
Originally Posted by NoL View Post

Are you also loading the 3.3v?
In some powersupplies the 5v and 3.3v are linked.

No, and I don't think I have anything to hook the 3.3 up to.
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Sigma
(14 items)
 
NukeBox
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CPUMotherboardGraphicsRAM
Core 2 Quad Q9550 GIGABYTE EP45T-USB3P HIS Radeon HD 4870 Turbo G.Skill Ripjaws 7-8-7-24 
Hard DriveHard DriveOptical DriveOS
Western Digital Caviar Green Seagate Baracuda Generic DVD Burner Windows 7 Home Premium 
MonitorKeyboardPowerCase
2 x Asus 23" Rosewill Black normal keyboard Antec TP 750 Antec Nine Hundred 
MouseMouse Pad
Razer DeathAdder Wooden Desk 
CPUMotherboardGraphicsRAM
Core 2 Duo e6750 Gigabyte GA-73VM-S2 Sparkle Geforce GT 440 1GB DDR3 OCZ Reapers DDR2 
Hard DriveCoolingOSMonitor
WD Caviar Green  Stock Win 7 Ultimutant 2 x ASUS VS238H 
KeyboardPowerCaseMouse
Rosewill cheapo "gaming keyboard" ULTRA 400W  None atm Razer Deathadder 
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Reply
post #7 of 7
How do you know your power supply sourced only 4A, did you measure it? what is the voltage reading on 5v rail when TEC it hooked up? if it still is 5V then maybe the TEC you are testing is not the 5v Vmax. do you have the spec for your TEC?
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