Solved Can I power one PC fan using two usb cables

February 4, 2017 at 10:15:29
Specs: Windows 10, 2.13gz/4gb
I have a old PC fan that I made into usb fan, but usb gives only 5v and it spins pretty slow. I was wondering if I could connect this fan to two usb cables. Would that be possible.
I know this question is in the wrong category, but i couldnt find better place to ask.

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February 4, 2017 at 13:30:47
If you can run the current in parallel, maybe. But your fan may burn up if is not rated to use 10v. I don't know that much about electricity. How did you make the USB conversion?

I don't need to be right, but I am never wrong.

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February 4, 2017 at 15:13:16
You are risking damage to your USB ports.

What are you trying to use this fan for? What is the voltage requirements of the fan?

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February 4, 2017 at 17:32:44
✔ Best Answer
USB 1.0 and 2.0 can provide up to .5 amps per port. USB 3.0 can provide up to .9 amps. If you wired 2 USB leads in series you'd get 10 volts but only the rated amperage for one--.5 or .9 amps. If you wired them in parallel you'd double the total current--1 or1.8 amps but the voltage would only be 5. I think most of those fans need between .1 and .12 amps so you would probably get better results by using a series connection but the voltage would still be low.

If this is a 'I just want to try it and see if it's possible' situation then go ahead but make sure you get it wired correctly or, as already mentioned, you may damage the ports.

If you're looking for something permanent it's a better idea to adapt one of the drive power connectors from the PSU that's already at 12 volts.

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