connecting 12v fans for cooling

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elstev0

Member - Posts: 5

Joined: August 20, 2004

Location: Australia

Posted: September 14, 2007 at 4:21 AM / IP Logged

Hope i have the right forum for this question, i have a pc installed in my car with a touchscreen for all my ICE requirements, i wish to install additional 12 volt computer fans for extra cooling, what is the best way to connect them as my PSU is limited in the amount of power it can provide i wish to do this from the battery.

connecting 12v fans for cooling -- posted image.

would this setup work.

thanks for any advice.

KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: September 14, 2007 at 7:19 AM / IP Logged

Yes, that would work. Just make sure pin 87 is hooked to a source that is capable of delivering enough current to run the fans. Also make sure to include the fuses!

Kevin Pierson

elstev0

Member - Posts: 5

Joined: August 20, 2004

Location: Australia

Posted: September 14, 2007 at 6:19 PM / IP Logged

Thanks for the reply.

For multiple fans is one relay ok or should i use 1 per fan i think they only use about 5 watts so i was assuming 1 relay.

I have the +12v wire going to pin 87 fused should i also fuse the wire to the fans pin 30.

thanks again.

stevdart

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Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: September 14, 2007 at 7:14 PM / IP Logged

Look at the diagram. Each accessory (fan) is fused directly before that accessory (S-curve symbol). Which means that every fan has a fuse. Half amp or 1 amp fuses should be fine but read the specs re power consumption. With every accessory individually fused, the wire leading from pin 30 does not get fused.

One Bosch 30 amp relay will handle a lot of fans.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

elstev0

Member - Posts: 5

Joined: August 20, 2004

Location: Australia

Posted: September 16, 2007 at 3:44 AM / IP Logged

thanks for the help i cant believed i missed that have to look closer at the diagrams in future.

ive set it all up and it worke great but when the car runs the voltage raises to nearly 14 volts, is this a problem and what would be a good way to regulate the power at 12 volts

thanks

KPierson

Platinum - Posts: 3,527

Joined: April 14, 2005

Location: Ohio, United States

Posted: September 16, 2007 at 8:12 AM / IP Logged

I think it would be ok at 14 volts.

You could pick a some 7812 from Radioshack and use that to regulate the voltage down to 12vdc if you are concerned about it.

Kevin Pierson

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connecting 12v fans for cooling

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