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#211329 - 10/05/13 06:52 PM 12V DC pump motor
Hammer1 Offline
New Member

Registered: 10/05/13
Posts: 2
Loc: MN
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 07:20 PM Re: 12V DC pump motor [Re: Hammer1]
JoeTestingEngr Offline
Member

Registered: 11/04/05
Posts: 786
Loc: 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.
Joe

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#211331 - 10/05/13 07:28 PM Re: 12V DC pump motor [Re: Hammer1]
Hammer1 Offline
New Member

Registered: 10/05/13
Posts: 2
Loc: MN
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.

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#211333 - 10/05/13 07:48 PM Re: 12V DC pump motor [Re: Hammer1]
JoeTestingEngr Offline
Member

Registered: 11/04/05
Posts: 786
Loc: 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.


Edited by JoeTestingEngr (10/05/13 07:50 PM)

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#211334 - 10/05/13 09:08 PM Re: 12V DC pump motor [Re: Hammer1]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9012
Loc: Estero,Fl,usa
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".
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#211335 - 10/05/13 09:19 PM Re: 12V DC pump motor [Re: gfretwell]
sparkyinak Offline
Member

Registered: 07/08/07
Posts: 1286
Loc: Alaska
Simple. Call an electrician. Welcome to the board BTW
?=^)
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#211346 - 10/07/13 07:25 AM Re: 12V DC pump motor [Re: Hammer1]
jdevlin Offline
Member

Registered: 08/07/02
Posts: 402
Loc: welland ontario canada
Eliminate the battery and just use a 10 amp charger.

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#211522 - 10/23/13 08:20 PM Re: 12V DC pump motor [Re: jdevlin]
mxslick Offline
Member

Registered: 10/24/04
Posts: 785
Loc: 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.
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#211524 - 10/24/13 07:35 AM Re: 12V DC pump motor [Re: Hammer1]
ghost307 Offline
Member

Registered: 05/09/05
Posts: 877
Loc: 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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