1 Topic by hansen644

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Topic: number of fans I can use on one power supply?

HI wondering how many 12v fans I can use on one power supply? I would like to add fans to my stepper motors.
I have this power supply http://www.muchbuy.com/catalogsearch/result/?q=5998

2 Reply by Tin Falcon

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Re: number of fans I can use on one power supply?

Should not be a problem to add a fan to each motor.
Even if each fan pulls 330ma that is only adding about 12 watts load to your system.
IIRC my stock solidoodle only pulls about 120 watts.
Ohms law is your friend.
Tin

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3 Reply by hansen644

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Re: number of fans I can use on one power supply?

Thanks

4 Reply by grob

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Re: number of fans I can use on one power supply?

To expand on Tin's advice, the fans often have their current draw written on the label (e.g. "12V 0.18A")
Power is voltage x current, so in the above example 12 x 0.18 = 2.16W

The 360W supply you've shown is more than capable of running the printer, and a fairly large quantity of fans!

SD3. Mk2b + glass, heated enclosure, GT2 belts, direct drive y shaft, linear bearings, bowden-feed E3D v5 w/ 0.9° stepper
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5 Reply by elmoret

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Re: number of fans I can use on one power supply?

If its actually capable of hitting near its rated capacity, that is.

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6 Reply by grob

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Re: number of fans I can use on one power supply?

elmoret wrote:

If its actually capable of hitting near its rated capacity, that is.

Yeah, true... Aiming for 100% overhead is never a bad idea with ebay power supplies! smile

Heatbed and E3D on full power on my machine and it runs about 20A (12+8A respectively). There's a bit of variation, but I'd still be pretty confident a 30A rated unit would manage that peak and the somewhat lower long-term continuous.

SD3. Mk2b + glass, heated enclosure, GT2 belts, direct drive y shaft, linear bearings, bowden-feed E3D v5 w/ 0.9° stepper
Smoothieboard via Octoprint on RPi