wind turbine battery charger

Discussion in 'The Projects Forum' started by timb00, Jun 21, 2014.

  1. timb00

    Thread Starter New Member

    Jun 21, 2014
    1
    0
    Hello
    Im a newbie for electronics and i need help with a school project.
    I am building a small wind generator to charge batteries. The batteries i want to charge are 2 ni-cad 1800 mah 7.2 v. My wind generator produces usaully about 9 volts and 4 amps and i would like to charge both the batteries at the same time but the voltage isnt high enough. so is there something to use to double the voltage and half the amps?
    Thanks Tim
     
  2. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,386
    496
    Set the batteries in parallel. That will create a current divider. Each battery will have 9 volts across it. And if they are exactly identical (which they are not, but we will ignore it for a minute), each battery will get 2 amperes.
     
  3. wayneh

    Expert

    Sep 9, 2010
    12,101
    3,033
    At the same time, for 36 watts?
    I'm just warning you that voltage is often cited without any load, and current is cited for a short, so no voltage. If that is the case, you'll get far less than 2A into each cell.

    I suppose you'd get less than 2A anyway, since you're driving current into 7.2V.

    Parallel is the way to go, +1. At worst you may need to isolate them a bit.
     
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,779
    1,103
    Have you considered how you will know when to terminate the charge, or how to prevent battery damage from excessive charging current?
     
  5. Lestraveled

    Well-Known Member

    May 19, 2014
    1,957
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    Is putting the batteries in parallel an option for you?
     
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