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Transformer to build 12 volt battery charger

Discussion in 'Power Electronics' started by rovmike, May 20, 2013.

  1. rovmike

    rovmike

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    May 20, 2013
    Looking to build 12 volt battery charger for a project. Having trouble finding a transformer with 120 vac in and 15 vac 10 amp output. Anyone have a place to recommend.
     
  2. davenn

    davenn Moderator

    13,346
    1,774
    Sep 5, 2009
    Hi there
    welcome to the forums :)

    that should be a reasonably common in and out voltage at that current capability

    Any decent electronics parts supplier should be able to supply
    you could try Digi-key in the USA

    Dave
     
  3. rovmike

    rovmike

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    May 20, 2013
    Thanks dave
     
  4. duke37

    duke37

    5,254
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    Jan 9, 2011
    I presume that you will need DC. If so why not get a simple battery charger?
    This will give you mains insulation, fuses, rectifier, ammeter and case.
    Cost will be similar.
     
  5. rovmike

    rovmike

    6
    0
    May 20, 2013
    Well I am trying to build my own to make four bank charger for my boat. I found everything but trying to find the right transformer. I the output to the battery to be 14 to 14.5 volts to supply to the board that will operate the trickle charge on e battery is full. I have purchased the on on board chargers and they rarely last over 2 years. At $400 a pop it is kind of hard to go buy another. Corrosion is the usual problem. These units are air tight sealed to go in a boat but the problem is the condensation. They are desiccant pads in them but they get saturated and spill out all in the unit. My plan is to build a sealed unit and fill it with shell diala. This would not allow the condensation and would help with the cooling. Plus I plan to build this so I can replace parts. The one on the market are sealed and you can not access the internal parts. Just thought I would let you guys know what my plan is. Just need what type and size transformer i need to charge the batteries at 10 amp per battery. Thanks for all the help!
     
  6. davenn

    davenn Moderator

    13,346
    1,774
    Sep 5, 2009
    so I assume you do the battery charging when the boat is tied up at dock ?
    or maybe when its at home ?
    ie ... the 2 places you will have access to 120VAC

    Dave
     
  7. rovmike

    rovmike

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    May 20, 2013
    Yes it will be charged at home. The charger will be mounted in boat with 120 vac cord coming out to plug into wall
     
  8. duke37

    duke37

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    726
    Jan 9, 2011
    I do not think that any filling will stop condesation unlass the box is hermetically sealed. You could change the desiccant regularly.

    You could keep the chargers in your house and connect to the boat with a multiway cable.
     
  9. rovmike

    rovmike

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    May 20, 2013
    Really want keep charger in boat. We oil fill our transformer where we work and we check for water once a year, and change it out every three years. I have yet to see any water condensate in it. How could condensation build when there is no air. It will be completely full of fluid with small compensator to adjust for oil expansion due to heat.
     
  10. rovmike

    rovmike

    6
    0
    May 20, 2013
    Still need info on the transformer size.
     
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