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#211329 - 10/05/13 09:52 PM 12V DC pump motor  
Hammer1  Offline
New Member
Joined: Oct 2013
Posts: 2
I have a 12V DC pump motor that I want to run off 110 recepticle. How can this be done?

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#211330 - 10/05/13 10:20 PM Re: 12V DC pump motor [Re: Hammer1]  
JoeTestingEngr  Offline
Joined: Nov 2005
Posts: 782
Chicago, Il.
Boy, is that an open ended question? Could be as simple as a small wall wart to a large linear or switch mode power supply. Is a control ladder required? We need lots more info.

#211331 - 10/05/13 10:28 PM Re: 12V DC pump motor [Re: Hammer1]  
Hammer1  Offline
New Member
Joined: Oct 2013
Posts: 2
It is a pretty small pump, I believe it draws 10 amps. It is an on demand pump that will draw water out of a tank and send to the toilet cycling everytime the toilet is flushed.I am trying to avoid having to have a battery and charger to run it.

#211333 - 10/05/13 10:48 PM Re: 12V DC pump motor [Re: Hammer1]  
JoeTestingEngr  Offline
Joined: Nov 2005
Posts: 782
Chicago, Il.
Then there are possibly thousands of single output DC power supplies that could meet your needs. Your application isn't one that requires 10A continuously, but probably needs more than 10A for short periods. Things to consider along with environmental and any required listings. Also consider the use of an appropriately sized flyback diode at the pump.

Last edited by JoeTestingEngr; 10/05/13 10:50 PM.

#211334 - 10/06/13 12:08 AM Re: 12V DC pump motor [Re: Hammer1]  
gfretwell  Offline

Joined: Jul 2004
Posts: 9,080
If this is something you are selling to a customer? I would get the supply the manufacturer specifies for the product. If you are just experimenting/inventing at home, Ebay has several supplies for around $40-50 shipped if you look at "12vdc 10 amp power supply".

Greg Fretwell

#211335 - 10/06/13 12:19 AM Re: 12V DC pump motor [Re: gfretwell]  
sparkyinak  Online Content
Joined: Jul 2007
Posts: 1,322
Simple. Call an electrician. Welcome to the board BTW

"Live Awesome!" - Kevin Carosa

#211346 - 10/07/13 10:25 AM Re: 12V DC pump motor [Re: Hammer1]  
jdevlin  Offline
Joined: Aug 2002
Posts: 402
welland ontario canada
Eliminate the battery and just use a 10 amp charger.

#211522 - 10/23/13 11:20 PM Re: 12V DC pump motor [Re: jdevlin]  
mxslick  Offline
Joined: Oct 2004
Posts: 803
Atomic City, ID USA
Originally Posted by jdevlin
Eliminate the battery and just use a 10 amp charger.

Nope, very bad idea. Most chargers will either put out too much voltage (they often have a high voltage start on charging and taper down as the battery charges), have excessive ripple current which can affect the motor's life, and often have very poor current/voltage regulation abilities.

Finally, a 10 amp or greater charger will often cost more than the 10 amp power supplies available from eBay, Mouser, DigiKey, etc.

Stupid should be painful.

#211524 - 10/24/13 10:35 AM Re: 12V DC pump motor [Re: Hammer1]  
ghost307  Offline
Joined: May 2005
Posts: 902
Chicago Illinois USA
If you're dead set on using a charger you'll need to do something to dampen the ripple and stabilize the voltage.
Without opening the charger and doing a bunch of calculations to figure out exactly what to put inside; the easy way is to run the motor off of a battery that is being constantly charged by an off-the-shelf battery charger.

But I agree that you will likely spend more time and effort than just biting the bullet and buying a proper power supply.

BTW, don't forget about the inrush current required start the motor when you're figuring out how many amps you are going to need.


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