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 Post subject: power fans using external USB unit.
PostPosted: Thu Mar 15, 2012 7:50 pm 
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Joined: Fri Jan 07, 2005 7:59 pm
Posts: 47
I'm trying to run a DIY external HDD box, and i want a fan to cool them.

1) I can use a regular AC mini fan, but that's a little bit over kill.

2) I decided hey, computer fans will do the trick... but powering them is problematic.

then I remember I have a bunch of those outlet USB thing, can they power fans?

i googled and found that people have been able to power computer fans with USB cables... however...

the fan is 12V @ .15A

the USB outlet unit is 5V @ 500ma = .5A

so my question is that will i burn the house down if i run the fans for a long period of time? i mean wattage wise the unit can handle the fan (5 X .5 = 2.5W which is more than 12 X .15 = 1.8W), however they're at different voltage... any electrician out there?


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 Post subject: Re: power fans using external USB unit.
PostPosted: Thu Mar 15, 2012 8:28 pm 
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Joined: Sat Apr 15, 2006 9:59 pm
Posts: 107
Location: California
I am not electrically inclined but I think I ended up using an old cell phone charger that I accidentally broke the charging tip and just spliced the wires by twisting them and wrapping them in electrical tape. On a whim, I bought something similar to this at my local Fry's Electronics.

Cooler Guys AC to molex adapter


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 Post subject: Re: power fans using external USB unit.
PostPosted: Fri Mar 16, 2012 8:46 am 
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Joined: Thu Feb 04, 2010 6:06 pm
Posts: 3395
Location: US
Thermaltake has both an 80mm and a 120mm fan that work off of a USB connector. They both have adjustable speeds. Will that help?

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