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Running 12v fans off USB ports?


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#1
WhydoIask?

WhydoIask?

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I want to run 2 fans off of a USB port. The fans I have are 12v, 160mA case fans. I tried running them at 5v, and they didn't move much air at all. I read up some on a step-up converter to change the USB's 5v into 12v, but there is a drastic drop in current when using one (something like an %80 drop in amperage from 500mA.) If I were to wire 2 USB ports in parallel (thereby doubling the current to a full amp,) would there be enough current to run both fans? Or just one?

Thanks.
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#2
zep516

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Why not just use and extra 12V plug from your computers power supply? Computers usually have a few extra 12V plugs.
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#3
WhydoIask?

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Yeah... about that...
I'ts a laptop.
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#4
Kemasa

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If the system can actually provide the current to BOTH the usb ports and if you get a device that can make use of both (don't want to just connect the two together) and also convert the voltage, then in theory it might work, but you are going to be draining power from the laptop. The cost to properly do all of this is going to exceed other better means to run the fans.

Instead, I would suggest getting a 12v battery or adapter to run the fan and not try to extract power from the USB port.
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