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

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Old 03-13-04, 09:45 PM Thread Starter   #1
Venesectrix
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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
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Old 03-13-04, 09:47 PM   #2
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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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Old 03-13-04, 10:20 PM   #3
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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
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Old 03-13-04, 10:33 PM   #4
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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.
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Old 03-14-04, 10:40 AM Thread Starter   #5
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Would it last longer if I used 6 AA (1.5V) batteries? The fan is rated at 4.2 watts.
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Old 03-14-04, 04:35 PM   #6
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Either way, you dont wanna change your bats every hour. That's why batterys wont work

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Old 03-15-04, 09:09 AM   #7
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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.
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Old 04-13-04, 02:16 PM   #8
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9v batteries are only 7.25 volts max ordinarily =P

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Old 04-13-04, 02:31 PM   #9
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Quote:
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.
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Old 04-13-04, 03:10 PM   #10
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Quote:
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.
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Old 06-10-10, 02:04 PM   #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.
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Old 06-10-10, 04:10 PM   #12
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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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