converting 110vac to 12vdc

Discussion in 'The Projects Forum' started by g.farmer, Apr 14, 2010.

  1. g.farmer

    Thread Starter New Member

    Apr 14, 2010
    2
    0
    Hello, I am trying to run a car radiator fan motor from a 110vac power supply. What is the cheapest & easiest way this can be done ?
     
  2. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    If you have some old 12 volt car battery charger you could try that.
     
    Last edited: Apr 14, 2010
  3. whatsthatsmell

    Active Member

    Oct 9, 2009
    102
    4
    How many amps does the fan draw?
     
  4. aboamal

    Member

    May 29, 2008
    14
    0
    radiator fan normally draw 15 to 20 Amps
     
  5. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    312
    You are gonna find it much easier to buy a few dollar AC motor then to attempt this.

    BUT If you really want to do this.. (and by the way, my radiator fan draws under 1 amp a 20 amp draw fan would kill your battery if it ran with the engine off for more than a few minutes, so I would double check the specs)

    But the easiest way would be If you have a 120vAC to 12vDC converter that could handle that amperage.

    A car battery charger would be a good way to get that.

    High performance High CFM radiator fans draw around 5A, typically.
     
    Last edited: Apr 14, 2010
  6. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    Oh in that case the battery charger will not be able deliver the current. I did not know they needed so much current. :eek:
     
  7. 777funk

    New Member

    Apr 13, 2010
    6
    0
    Depends on the battery charger.

    But yes if you're looking to run it long term, I'd just go get a window fan for $15-$25

    It'll be the easiest.

    Otherwise I suppose you could build a power supply if you're looking for a project. Basically-transformer-rectifier (type will depend on your transformer or whether you want it in one piece of to fabricate it yourself and how much current required)-filter caps. You shouldn't need super clean DC to run a fan.

    But all that said, I'd just go get a window fan.
     
  8. whatsthatsmell

    Active Member

    Oct 9, 2009
    102
    4
    Some fans draw quite a bit more than that - up to 40 amps (see Lincoln).

    Anyway, if all you need is 15 amps, hack an ATX computer power supply. I used a 450 watt supply that I got on ebay for less than $20. (including shipping) to run a 12v fan on an aux generator. The 12v rating on that power supply is 20 amps. If you need more, get a larger power supply.
     
  9. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    312
    Wow, that is huge draw. Is that for a single fan motor or a multi fan setup? And is the 40A the startup spike or the running draw?

    Heres what I found:
    and the dual fan setup:

    These were found via: http://www.autopartsdeal.com/Parts_List/electric_cooling_fan/lincoln/town_car/

    I found an 18a fan for a Mustang:

    So I guess anything is possible. But I think the amount you would pay to convert the 120vAC to 12vDC at those current levels would more than cover the cost of an AC motor.
     
    Last edited: Apr 15, 2010
  10. g.farmer

    Thread Starter New Member

    Apr 14, 2010
    2
    0
    Thank you all for your help. I was hoping to find a converter simular to a phone charger, only bigger. For now someone loaned me a converter that is used on a rv. It's working fine, but certainly a little overkill.
     
Loading...