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Understanding Fan Controller Wattage

post #1 of 6
Thread Starter 
I am thinking of buying this fan controller:
"30W per channel"

I'm worried it has only 4 channels.

If I use a 3 pin Y cable, can I connect 2 of these fans to 1 channel
"Current: .70A & Input: 8.4W"

Will the fans work at full power?
Edited by Viesta - 4/14/12 at 3:45pm
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post #2 of 6
Yes.
post #3 of 6
Thread Starter 
How about 4 of those fans to 1 channel ? Using a 3 pin quad cable
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post #4 of 6
4 * 8.4 = 33.6 W and your controller can handle 30 W so that won't work.
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post #5 of 6
Should be easy to figure out, use this.

Watts = Amps x Voltage.
post #6 of 6
Do you know where the fiqure of 8.4 watts came from? (the term input is a bit odd,usage or consumption would make more sense). The formula for power (expressed as watts) is P=IxE. With I being current (in amps) and E being volts. Fan controllers get their power from the Molex connector.Present at the Molex are two voltages 12V and 5V. In this case we use the 12V figure in the formula,so 12Vx.7A=8.4W.The formula for power is easy to remember as it spells "PIE". PIE is not the only formula to use to figure power.

Each of your fans consumes 8.4W and each channel is rated for 30W so with 2 fans you are only at 16.8W,well below 30W.

EDIT: most likely 3.6 watts out of spec will not be an issue.Watch the temps on the components of the controller,(use your finger).The issue you will see with a greater than rated load on the controller is high temps on the components of the controller.Perhaps a larger heatsink or a fan directed at the controller will buy you this extra wattage usage.Running the fans at a slightly reduced speed will certainly buy you this extra wattage.Use a amp meter in series with the 12V feed and see if fan speed is adaquate with .62A being drawn.then you will be right at spec but I think 3.6W over spec is OK,espically with a fan blowing air across the controller.
Edited by PCCstudent - 4/14/12 at 4:11pm
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