Solar AAA battery charger

Discussion in 'The Projects Forum' started by taozeo, Mar 7, 2013.

  1. taozeo

    Thread Starter New Member

    Nov 11, 2010
    Hello all!

    I'm trying to design a circuit in which I can charge a rechargeable AAA 1.5v battery with a small 0.5v solar cell (space is limited so only enough room for one solar cell). Now I realize I'll need at least 1.5v-1.8v to charge a AAA battery--so I was thinking of having the solar cell charge a capacitor up to the required 1.8v's and then discharge this energy into the battery; repeating this process until the battery is fully charged.

    Another requirement is that the device may at times be using power from the battery simultaneous to while it's charging; would there be any issues or possible damage to the device? If so, what kind of protection circuit should I implement?

    Any advice/tips or example circuits you can help me out with would be great!
  2. Mr.Gadget

    New Member

    Nov 25, 2012
    You can't get out more than you put in. Physics says you can't di it with what's available today. Wire up more solar cells to give yourself a chance.