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02/08/2010, 10:47 PM
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#1 |
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Registered Member
Join Date: Nov 2006
Location: Idaho
Posts: 177
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Wiring case fans for aquarium cooling
I have a question about case fans. I have two case fans wired to one 12v adapter. Everytime i disconnet one fan the other one speeds up alot, when i connect it back it slows down. what is happening? Am I cutting the amperage in half everytime i connect both?
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02/09/2010, 12:42 AM
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#2 |
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Blue Thumb
 
Join Date: Oct 2009
Location: Mobile, AL
Posts: 138
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More power = more RPM in all case fans
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Conservation through propagation |
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02/10/2010, 05:50 PM
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#3 |
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Registered Member
Join Date: May 2001
Location: Folsom, CA
Posts: 359
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How did you wire them?
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02/10/2010, 06:27 PM
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#4 |
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Registered Member
Join Date: Mar 2004
Location: So. Cal
Posts: 234
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sounds like the 12v adapter maybe on the the lower mA side. Whats the power output listed on the power supply? You should have a spec sheet with the fan you bought...or a sticker on the fan motor listing its power consumption and speed. Start adding the mA and get the right sized power supply. 12v fans will run on almost anything down to 5v they just slow down when under driven
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02/10/2010, 06:31 PM
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#5 |
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Registered Member
Join Date: Oct 2006
Location: San Diego
Posts: 284
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Yes, this would be the case. You wired "in parallel" with an identical potential difference to both fans. When you connect a second parallel path only half as many electrons will take that path because both ways are the same.
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Dana Current Tank Info: 210g reef, 20g surge |
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02/10/2010, 07:01 PM
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#6 |
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Registered Member
Join Date: May 2001
Location: Folsom, CA
Posts: 359
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The correct way to wire multiple fans is to wire them in parallel.
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