Serial connection for fans.

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arajigar

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Hi. Just to make my rig less noisy, I want to try serial connected fans. My basic knowledge of electronics reach the fact that connecting in series two fans will halve the volts making it run at half the RPM\speed. But, what happen with amps?, I did read that this kind of setup drains double amount of amps, if so, will this be continuous or only at full speed or when the fans start to spin if both amps have PWN control?.
Thanks in anticipation.
 
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CountMike
Serially or in parallel, amperage still ads up. W(ats) = A(mps) x V(oltage).
Yes it might make problems if you overload it. If you have AiO_pump or W_Pump header you can use that for fans too. They usually give more power.
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CountMike

CountMike

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Not advisable to connect fans in series, those are not ordinary DC motors. Those are brushless, polifaze, permanent magnet motors and have a solid state oscillator as power input. PWM fans/motors are even more complicated.
What you were thinking about applies only to resistance circuits like light-bulbs/resistors and yes, in that case Amperage of all parts adds.
Please refer to Ohm's laws. Elementary physics.
 
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arajigar

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Yes, that's my fault!, I forgot all that basic stuff about resistances, etc. What worried me the most is overload the MOBO's fan header. So, for an 1 Amp capacity of a header, adding three 0.5 amp fans serially connected will destroy that header and probably the MOBO, right?
 
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arajigar

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Thanks a lot!, I will follow your advice.

Edit: did my maths!, he,he.

I(amp)=watts/voltage
I=1.44 x 2/12
I=2.88/12
I=0.24

For 2 identical fans that drains 0.12 Amps and 1.44 Watts from the header. Thanks!, Now I feel safer doing this. ;)

Edit: done! They run slower, although I have the impresión that one of them runs a bit slower than the other, but it will be caused by the fan's top sticker which is a bit un centered...
 
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Karadjgne

Karadjgne

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It won't hurt in the slightest to run analog fans in series. By running in series, 2 fans split the voltage, so you'll see a max of 6v for each fan. Depending on the quality of the fan, they may or may not work. Quality fans have a voltage range of @5v-13v DC, lesser fans usually @7v-13v.
Amperage on the cable will remain the same at source, as will resistance.
 
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