How to run my 24v Spal Fan?

RodneyMullen

RodneyMullen

RodneyMullen

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Hello guys.

I live in the UK, and want to run my Spal fan from a UK socket.

Most of these fans however are used in automotive vehicles, so there is not much info online.

I have posted the fan stats below.

What PSU do I need to run the fan at a set speed?
Im guessing a 24v PSU with atleast 6A will work, but thats 150Watts - I dont need it running full speed.

Also, If I wanted to change the speed of the fan, I guess I would have to change the voltage or amperage? What PSU could I use for that?

The fan does have the capability to be run safely at a lower speed.

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1100 CFM !

That's 10 times the Noctua Industrial fans.

Unless you are building a plane, what are you using it for ?
 
Hello Brizzles, your right the CFM is huge, however I dont want to run it at top speed, just good to have the overage there.
Im hoping to run it around 1/4 or 1/2 of that speed.

I got the fan for cheap, want to use it for my watercooled rad.

Do you know if I got a 24v power supply at 2-3A, would that run the fan? Im concerned it might not start up...
 
Those current levels seem insane for a fan - it would take a bit of wiring but you can get 12v/24v (or variable) boost convertors that can handle that wattage on ebay/amazon but if you connected it to your PC's molex connectors you'd need to know that PSU rail could support that power draw (also the generic "Chinese" ones that are rated for like "150" watt in reality will only handle about 100-110 so you'd have to buy one with a bit of overhead).

Alternative could look at like replacement laptop or similiar power supplies as some of those will run in the voltage and current levels you are looking at.
 
Any of those look like they'd do the job - just make sure you get a good connection, etc. as with that current draw you can easily get arcing or even melting wires heh from a loose connection or not good enough gauge.
 
Run it at 12v. It'll still draw a few amps and provide more airflow than several PCs would ever need.

Probably better to sort your cooling by using better heat transfer rather than trying to overcompensate by blowing more air though.

A molex should provide sufficient current handling at 12v. If you find it's too slow then consider a 24v mains adaptor or a laptop charger at 18v and a dozen Amps.

Alter voltage to drop speed. You could potentially drop the current but to do so you'd need to add a high current resistor and deal with the heat.
 
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why do you need that?

you know fans for cars are not made to run quiet i would think at its starting amp's it will be around 50%, you can just say i will run it at 1/4 power, the fan will only start at a set power/amp
 
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Car fans are designed to over come heat soak and also act as a secondary cooling as the air whips past the engine etc to draw away even more heat.
cars, due to design have tiny radiators (In relation to the heat being generated.)The fan is a safety net if the car isnt moving much, bigger rads = more area for damage and also limit bay design make it impossible to reach anything inside the engine bay.
All things that dont really apply in a pc case (Well least i hope not!)

Saying that i wish you good luck, it will certainly be diffrent.!

I would love to see some video footage thou if you ever get it set up :)
 
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