PC fan wiring - Amperage question

I have wired a PC fan to a power supply. The fan is 12 volts and my power supply is 12 volts. The fans says it is 0.32 amps but my power supply is 1.25 amps. Is this going to cause a problem or will it just burn the motor out faster. I dont know much about wiring but I was able to hook it up and it runs ok. I am just worried about fire danger.

bump......

not to jack your thread or anything but how do you wire PC fans? Can you plug them into any outlet or do you have to re-wire them for that?

I'm pretty sure you will be fine. Because the amp usage w/ the fan is less than the power supply you wont overload it or anything. I have some basic information about wiring and electricity but someone more experience might want to confirm that.

Charfizcool said:

not to jack your thread or anything but how do you wire PC fans? Can you plug them into any outlet or do you have to re-wire them for that?

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Here ya go
https://www.rollitup.org/grow-room-design-setup/48068-diy-wiring-fans.html

Power supplies are rated at max they will deliver.

Fans (and other items that plug into PSUs are rated at what they need)

The PSU has more power the needed. The fan will take what it needs no more. (Unless the PSU is a constant current type, but it ain't)

Think of it this way. The outlet your lamp is plugged into is a 15amp outlet. That light ain't 15 amps.

Its really simple to wire. Just get an old ac adapter that is 12 volts.

Cut the end of it off.
Splice each of the wires.
Then grab your pc fan. Usually 3 wires on it. Yellow, Black, and Red is what mine have been everytime.
Splice up those so you can wire it.
Take that positive and negative black and red wire and connect them to your spliced ac adapter

And viola plug that baby in and let it do its work.

Hope that helps, I can post some pictures if you need a better explaination

joesalamon said:

Its really simple to wire. Just get an old ac adapter that is 12 volts.

Cut the end of it off.
Splice each of the wires.
Then grab your pc fan. Usually 3 wires on it. Yellow, Black, and Red is what mine have been everytime.
Splice up those so you can wire it.
Take that positive and negative black and red wire and connect them to your spliced ac adapter

And viola plug that baby in and let it do its work.

Hope that helps, I can post some pictures if you need a better explaination

Click to expand...

I think I have the basic idea thx

Awesome, thanks guys!

do you think it would be possible to put 2 fans on one 12v ac adapter? or is it a bit much?

thatd be ok just keep the total amps below the max amps

how about connecting four 12v fans to a 19.5v charger?

bbqchip said:

how about connecting four 12v fans to a 19.5v charger?

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The higher voltage can burn out the insulation on the windings.

The # of fans any adapter/power supply can run is determined by the amps of the adapter/PS.

Think of volts as water pressure and amps the volume of water flowing.

why not use a cheap computer power supply. most pc's that are thrown away still have a usable psu. these give a 12v 5v and 3v output. most psu's have an amp rating on them eg: 12v - 19a, 5v -60a,

a 200w psu once contverted too bypass the motherboard sensor will run easy 5-7 14cm 65.5cfm pc fans and speed controls if required, some controls ( hardcano, thermaltake) have 3x heat sensors and lcd readout for temps and fan speeds and do not require pluging into a mobo too read temps. ideal for smaller closet grows.most psu's also come with there own cooling fan too. you could also if clever wire up LED's too run from the psu as extra light in certain bands

if you want too i can post a quick post on the rewiring of a computer power supply

Tamzi

i got a old Power supply from my old computer and used that with a 12v DC power lead i found, works a treat.

Tamzi said:

if you want too i can post a quick post on the rewiring of a computer power supply

Tamzi

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I like the sound of that! Please post your power supply rewiring