Running PS with just fans

Do you have a question? Post it now! No Registration Necessary.  Now with pictures!

Threaded View
Would it be safe to run a 500W power supply with the only load being 4
12V fans (and a few LED lights) or would this not be sufficient load to
operate safely?

Re: Running PS with just fans

It would operate just fine.  You can always run a lower load than the PSU
capacity, just not more.


Quoted text here. Click to load it

Re: Running PS with just fans

Even lacking a motherboard and other normal components?

Re: Running PS with just fans

On 21 Apr 2006 16:38:16 -0700,

Quoted text here. Click to load it

It depends on the psu... some have more internal loading
(power resistors) than others.  Some might even shut off
froma rail being oo-spec too much.  If that happened, you
could put a dummy load of some sort on the highest rail (%
over it's spec off the most), typically being the 5V rail
presuming the currently proposed load is fans on the 12V

Other psu, maybe most would run but have oltage off-spec
still.  It's not a problem per se to do it then but why??

If you justwant fans you might consider a regular 12V approx
1A DC  wall-wart.  It will waste less power, a multi-hundred
watt ATX psu is not meant to have such a light load and
efficiency not tuned for it.  It also puts wear on only a $5
psu (or many old consumer electronics could be cannibalized
for one instead, for free).  That'd take a bit of soldering
though, if you wanted a reliable electrical joint.

Re: Running PS with just fans

Some Power Supplies require a minimum load to operate correctly. In
some cases, not meeting the minimum load, and the supply might not
regulate the current correctly. Here is a listing of Power Supply

Site Timeline