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  1. #1

    Arrow Using a 12V fan with a 9V battery...

    What would happen if I hooked up one of my computer fans (which runs on 12V DC) to a 9V battery? Would it just run slower because of less voltage? I want to know because I've got an idea but I don't want to take apart one of my fans only to find out that it won't work

  2. #2
    Member Lt. Max's Avatar
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    that will work, it will run at 9v, but the battery might not last long depending how many watts the fan pulls

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  3. #3
    Member Busty St. Clair's Avatar
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    yeah 9 volt batterys don't last long maybe like 10min-15min if you are lucky which even 10min is pushing it

  4. #4
    Member Mr.Radar's Avatar
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    I remeber I ran a 12v fan (used 1.8 watts), after about 3 seconds of running it, the voltage from the battery had dropped about .25 This was a "Super Heavy Duty" better (non-alkaline) but I couldn't find an alkaline battery that would let this thing spin-up.

  5. #5
    Would it last longer if I used 6 AA (1.5V) batteries? The fan is rated at 4.2 watts.

  6. #6
    Either way, you dont wanna change your bats every hour. That's why batterys wont work
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  7. #7
    Member Barn_Angel's Avatar
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    he is talking about a small test.
    4.2 watts has gotta be a beast fan, maybe connect a few 9V fans in a series as a paraless circuit (as to increase amperage, not voltage) to do it.

  8. #8
    Member pwnt by pat's Avatar
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    9v batteries are only 7.25 volts max ordinarily =P
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  9. #9
    Member SavageBasher's Avatar
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    Originally posted by Barn_Angel
    he is talking about a small test.
    4.2 watts has gotta be a beast fan, maybe connect a few 9V fans in a series as a paraless circuit (as to increase amperage, not voltage) to do it.
    Series = Increase Volts.
    Parallel = Increase Amps.

  10. #10
    Disabled greenman100's Avatar
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    Originally posted by pwnt by pat
    9v batteries are only 7.25 volts max ordinarily =P
    wtf are you saying?

    They don't rate them at 9v for nothing.

    7.25 if discharged or under heavy load, maybe.

  11. #11
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    How long it will last?

    I just hooked my 12v security camera to a 9v battery for power and i got a hour and 4mins of use.This was a Sunbeam dollar store battery.Just imagine a Duracell or energizer.

  12. #12
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    Conumdrum's Avatar
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    Willp, the amount of current draw for the camera is a LOT less than the fan will pull.

    4.2 watts is .26 amps, yep not a weak fan.
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