Current limiting for Cooling fan?

Hi all, I have four SUNON cooling fans with the rating DC 12V 1.8W. I am going to power all four fans with DC 12V 60W power supply. All four fans and power-supply will be in parallel circuit. Since the source power is higher than fan's power rating, should I have to add any current limiting resistors to the fans? If so, how much be the resistor value?

Thanks in advance.

-Ajay

by digiajay
May 02, 2012

Are those 1.8 Watts, or 1.8 Amps?

Is there going to be any other load on the power supply?

You see if the fans are 1.8 watts, they add up to about 7.2 watts. Some power supplies are unhappy with a load that's only 12% of their rating. So if there is no other load on the power supply, the supply may not run well.

In any case, you don't need any current limiting resistors or anything, the fans are designed to run off 12 volts.

by arduinohacker
May 02, 2012

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