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Making a 12 volt motorcycle trickle battery charger

Discussion in 'Misc Electronics' started by [email protected], Dec 14, 2004.

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  1. Guest

    Would it be possible to use one of those universal AC/DC power supplies
    as a 12-volt battery trickle charger?

    The power supply is one of those that you can select the voltage via a
    switch, you can choose between 3 - 4.5 - 6 - 7.5 - 9 or 12 volts.
    The output is DC & the current of the supply is 300mA. (3.6VA max)

    I ask as I have seen Motorcycle trickle battery chargers for sale,
    these only put out 300mA & looking at these they look very similar to
    the power supply I have with the exception that they can only be
    switched between 6 & 12 volts.

    Any advice appreciated.
     
  2. JS

    JS Guest

    Possibly but the voltage of a 12V battery rises to more than 12V when on
    charge.
     
  3. Jim Thompson

    Jim Thompson Guest

    It won't charge at all... takes at least 13.2V

    ...Jim Thompson
     
  4. Jerry G.

    Jerry G. Guest

    For safety and to not damage the battery, you should buy a proper charger
    for it. You do not want to over or under charge a battery, especially one
    that is a lead acid type. Obviously you are not well versed in the
    engineering of chargers, and battery design, or you would not be asking this
    question on a public news group.

    This is a very strong safety recommendation.

    --

    Jerry G.
    ======


    Would it be possible to use one of those universal AC/DC power supplies
    as a 12-volt battery trickle charger?

    The power supply is one of those that you can select the voltage via a
    switch, you can choose between 3 - 4.5 - 6 - 7.5 - 9 or 12 volts.
    The output is DC & the current of the supply is 300mA. (3.6VA max)

    I ask as I have seen Motorcycle trickle battery chargers for sale,
    these only put out 300mA & looking at these they look very similar to
    the power supply I have with the exception that they can only be
    switched between 6 & 12 volts.

    Any advice appreciated.
     
  5. Guest

    I have a couple of these power suppliers & I have tasted their output
    with a digital multimeter.

    Most put out the voltage that is selected (or very near) but one of
    them puts out 13.24 v on the 9 volt setting & 17.90 v on the 12 volt
    setting!

    If I had one of these adapters that say put out 14volts would it be ok
    to use as a charger?

    Thanks.
     
  6. Bill

    Bill Guest

    You are most likely measuring the no load voltage on an unregulated
    power supply and not the loaded voltage. When you draw current from
    it you will see the voltage come down.
    Stick to a charger made for your application.
     
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