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Battery Charger from Single Solar Cell

Discussion in 'Alternative Energy' started by The Mad Professor, Jul 5, 2006.

  1. The Mad Professor

    The Mad Professor New Member

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    The circuit is a little old but the principle is sound enough.
     

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  2. Paul Obrien

    Paul Obrien Guest

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    Sounds like a very slow way to charge a battery 9V@30mA from 0.4V @1A.
    The small panels ie solar garden lights, produce around 40mA.
     
  3. The Mad Professor

    The Mad Professor New Member

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    I did say it was an older circuit , construction of solar cells has come a long way in the past few years and conversion efficiency has been improved. Yet they still remain an expensive item to purchase.

    £1 (one english pound) gets you a single solar cell with the characteristics..
    [lifted straight from the Maplin website]

    Ouput voltage: 0.45V
    Output current: 100mA (in bright light)
    Dimensions: 47 X 27 X 7mm
    Weight: 10g
     
  4. dave

    Dave New Member

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  5. Paul Obrien

    Paul Obrien Guest

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    And with the circuit that would supply 3mA to a 9v battery, in bright light.
    So in 1 day of bright light, no clouds, that would supply 30mA to the battery and as the battery would save only around 80% of the charging current it really makes for a slow charger. If you were to buy 16 of the solar panels you could charge a 7.2 PP3? in 1 hour
     
  6. Hero999

    Hero999 Banned

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    It doesn't stop it from being a clever little circuit though.
     
  7. oldtimer

    oldtimer New Member

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    Solar panels cost about $5 a Watt. I bought a 110 W about 18 months ago at around $550, hurricane Wilma stole it though.
     
  8. bryan1

    bryan1 Well-Known Member

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    Ouch :eek: I've got 14 kaneka 65 watt thin film panels on the house and 8-65 watt poly crystaline panels along with an 80 watt panel on my shed roof. I'm glad we don't get hurricanes around here or I'd be stuck running gensets just to turn a light on if the winds not blowing.

    Cheers Bryan :D
     

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