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Wiring a 12v fan

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Wiring a 12v fan

Unread postAuthor: flamerz14 » Fri Jun 01, 2007 11:57 pm

I want to wire my computer fan but its a 12v.What sorta batteries can I use and whats the best way to join iwres? I gotb these insulator closure thingys and tape but no soldering iron. Help wanted.
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Unread postAuthor: SpudBlaster15 » Sat Jun 02, 2007 12:23 am

Computer fans will run on nearly any voltage level. In this case, current is much more important than voltage. 8 AA batteries wired in series, or a 9 volt alkaline battery simply do not output enough current to run a fan quickly. What you need is a set of some good, rechargeable NiCd or NiMH cells. 7 of these cells output 8.4 volts when wired in series, and such a configuration will run a computer fan nearly twice as fast as 12 AA batteries will.

I suggest buying a decent soldering iron, and purchasing 7 - 8 decent NiMH or NiCd Sub C cells from here. You will also need a charger. A simple wall charger can be purchased quite inexpensively. The whole setup shouldn't cost more than $30 or so.
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Unread postAuthor: flamerz14 » Sat Jun 02, 2007 4:01 am

I have a rechargable 9.6v NiCd battery pack from a R/C car.Would this work?
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Unread postAuthor: Orpackrat » Sat Jun 02, 2007 5:37 am

It should work just fine, though expect a little less performance for using less than 12 volts. I've put 2 9volt batteries in series on a computer fan with increased performance but I don't know how long the fan will last doing that.
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Unread postAuthor: flamerz14 » Sat Jun 02, 2007 6:35 am

:lol: but the only thing I want from the fan is thatit vents under 10 seconds. by the way, how do I top my fan from moving when ignition occours? my friends just blewbackwards and was damaged.
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Unread postAuthor: hi » Sat Jun 02, 2007 11:19 am

that is what great about electric motors. you can make them run off of as many volts and amps as you want them too, as long as you keep it cool.

so you could run it at 50 volts, or at 1 volt. its up to you. just remember that if it gets too hot, it wont work.
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Unread postAuthor: SpudBlaster15 » Sat Jun 02, 2007 1:00 pm

Orpackrat wrote:It should work just fine, though expect a little less performance for using less than 12 volts.


If his battery is made using decent cells, it will drastically outperform 12 volts worth of alkaline batteries.
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Unread postAuthor: flamerz14 » Sat Jun 02, 2007 9:10 pm

Define decentcells? My battery pack lasts for quite long and is quite powerful.I can use it non-stop for about 1.5 days in the car and the car travels aat ard 15kmph.Fast no?
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Unread postAuthor: Redcoat » Sat Jun 02, 2007 9:20 pm

you can get 12 volt batteries if you want.Just mod those wires coming out of the battery i.e. Cut them before they get to that plug thing and go from there.
(im not really an electronics expert)
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Last edited by Redcoat on Sat Jun 02, 2007 9:21 pm, edited 2 times in total.
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Unread postAuthor: SpudBlaster15 » Sat Jun 02, 2007 9:20 pm

The best way to determine a result is to hook the pack up to your fan and gauge the performance.
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Unread postAuthor: flamerz14 » Sat Jun 02, 2007 9:23 pm

OMG 1kg? I don't want any unnessacary weight. but since hi said that electric motors can run off as many volts, I'm probably sticking to my 9.6 pack. by the way I saw these RC battery packs of 15v but they have 3 wires.How do I wire them?
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Unread postAuthor: Redcoat » Sat Jun 02, 2007 9:53 pm

yeh just do that i was just trying to help.

but 1.56 kg is not alot of weight at all.
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Unread postAuthor: flamerz14 » Sat Jun 02, 2007 10:07 pm

yeah but still..
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Unread postAuthor: mtronic » Tue Jul 17, 2007 11:28 pm

im sure you've already sorted this out, but I run my 12v fan off an ever ready 9v heavy duty battery($3.50 Aud from go-lo) It works fine, vents the 4" x 22" chamber in about 5 seconds and mixes the fuel in about 3 seconds. It just doesn't run the fan flat out, which is no big drama and its light weight.

As for getting the fan inside the chamber, I just packed the corners of the fan with crumpled duct tape to form lumps in the corners, then taped them down. Its an extremely tight fit and you dont have to go drilling extra holes into you're chamber with this method.
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Unread postAuthor: Thrilla » Wed Jul 18, 2007 9:53 pm

Starting voltage for many computer fans is 7v, below that it won't even start. It's best to keep the maximum voltage under 13.5v, else the electronics inside will fry :shock:
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