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Help with battery installation

Discussion in 'Electronic Basics' started by Meanie, Jun 23, 2013.

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  1. Meanie

    Meanie Guest

    My wife has an electric yarn spinner which operates from 120v outlet and
    converts to a 12v 1.2 amp(max)DC power. Per the manufacturer, amps are
    typically running at .5.

    I want to provide a power source without the required need for a power
    cord. Therefore, the obvious solution is battery power. The confusion
    lies with the amps. I know all AAA, AA, C and D size battery outputs are
    1.5 v (1.2 running) and each one puts out different amps. As I
    understand it, amp output for AAA is roughly 1, AA is 2, C is 4 and D is
    8. Therefore, I assume the AA, C and D are not needed due to the higher
    amps since I will need at least 8 batteries to achieve 12 volts, unless
    I go with a 9 volt plus two AAAs, which seems more logical since a 9v
    puts out .5 amps. Anyway, this is the confusing part as what I need and
    whether to connect in serial or parallel.

    Can anyone provide some enlightenment for my lack of battery knowledge?

    Thank you
     
  2. Jasen Betts

    Jasen Betts Guest

    it depends how poerable you want it to be and, how much you want to
    spend on batteries, and how often you want to change them.

    I'd reccomend AA as a starting point and they last much longer than
    AAA but cost about the same price.

    On the other hand a 12V rechargable tool battery pack might be a
    better option, especially if you can borrow one to try out.
     
  3. Bob Masta

    Bob Masta Guest

    A big issue here is how long the device needs to run between
    battery charges (or changes). Batteries are rated in
    amp-hours. You note that the device normally draws 0.5 A,
    so you can find the *approximate* running time for each
    battery type by looking up its A-H rating (sometimes
    printed on the battery itself, especially for
    rechargeables). If it's a 1.5V cell, you'll of course need
    8 in series, as you note, but the same A-H rating applies.
    Just divide the A-H rating by 0.5 to get hours.

    If it needs long running time but doesn't need to be
    particularly lightweight, you might consider a 12V sealed
    lead-acid battery and charger.

    Best regards,


    Bob Masta

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  4. Meanie

    Meanie Guest

    Thank you all for the suggestions. I like the idea of a tool battery.
    I'm in the hunt for a 2nd charger for one of my 12v power tools. I plan
    to gut the charger and leave the prongs for battery connection. Wire
    from the prongs connecting to the required size adapter plug for the
    spinner. Therefore, the battery will have a holder and I can recharge it
    with my other charger. Sounds good in my head, I hope it works out that way.
     
  5. Meanie

    Meanie Guest

    It's already variable speed. I just need the portable power source.
     
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