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200 AA Batteries to make a portable power supply

Discussion in 'Power Electronics' started by LionHearted, Dec 30, 2014.

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  1. LionHearted

    LionHearted

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    Dec 30, 2014
    Got some music equipment I wanna busk with but theres no battery slot... So I was just curious, can't I just get 200 1.2v batteries then get a wall socket to plug it in?

    Might be a bit simple minded but I'm curious.
     
  2. davenn

    davenn Moderator

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    Sep 5, 2009
    hi
    welcome

    wall power outlets are AC
    Batteries are DC

    see the difference ;) :)

    Dave
     
  3. BobK

    BobK

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    Jan 5, 2010
    Yes, but only if play only songs by AC/DC. :D

    What you need is a 12V battery (like a car battery) and an inverter.

    Bob
     
    davenn, Arouse1973 and Gryd3 like this.
  4. davenn

    davenn Moderator

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    haha :)
     
  5. LionHearted

    LionHearted

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    Dec 30, 2014
    Of course, My bad ><

    Thanks guys.
     
  6. LionHearted

    LionHearted

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    Dec 30, 2014
    Probably another bad question, is there a formula I can use to determine how long the batteries will last if I know the wattage, voltage and amps that are going to be drawn?
     
  7. davenn

    davenn Moderator

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    Sep 5, 2009
    for rechargeable batteries, that's reasonably straightforward as they have their amphour rating on them

    so say its a 2000mAHr battery that means at best you can draw 2 amps for 1 hour
    in practice/reality it will be a bit less than that because of battery voltage drop and other factors
     
  8. BobK

    BobK

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    Jan 5, 2010
    Look into deep cycle sealed lead acid batteries. These will have an amp hour rating. Since they are 12V, you multiply by 12 to get a Watt Hour rating. For example, a 35AH battery is 420 Watt Hours. If you music system uses 50W this would last about 8 hours ideally. But an inverter is going to be no more than 90% efficient, so maybe 7 hours. And furthermore, the ratings of this type of battery are for discharge over 20 hours. Faster discharge rates will reduce the available energy, so maybe 4 hours. If the music system required 100W it would be more like 2 hours.

    Bob
     
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