Solar panel voltage regulator.

Discussion in 'The Projects Forum' started by Carlost, Feb 13, 2008.

  1. Carlost

    Thread Starter New Member

    Jul 9, 2007
    8
    0
    So I need to build a voltage regulator that will charge a extra battery that I have with some solar panels it asks for at least 24v and 2.5 amps. I had made a voltage regulator that is regulating the voltage at 24v when I plug it in to a power supply but when u put it on the solar panels out side it only gives me 7 to 9 volts and only 300mA or so and that’s not nearly enough to charge the batter any suggestions?? Or has any one built a circuit that could support the 24V and 2.5 amps that I need, the solar panels give me 27-29 votls but i dont think its giving me the current i need once under load, :confused:Pleas help. Thanks.
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Well, it sounds like your solar cell array is not able to supply sufficient current.

    What is the measured current your solar cell supplies at 24V?

    Take that result, and plug it into this formula:
    2.5Amps/CurrentMeasuredAt24V = NumberOfSolarPanelsNeeded

    You might also try using items like Fresnel lenses and mirrors to concentrate the sunlight on the cells, but beware of overheating them. To keep them cool, you could use a large heat sink.
     
  3. Carlost

    Thread Starter New Member

    Jul 9, 2007
    8
    0
    ok thanks so much il try that.
     
  4. Carlost

    Thread Starter New Member

    Jul 9, 2007
    8
    0
    Also would putting the panels in parallel be better the in series?? i have them in series now.
     
  5. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Connecting them in series increases the voltage, not the current.
    Connecting them in parallel increases the current, not the voltage.

    Solar panels have historically been quite expensive to acquire, particularly in larger sizes.
    To get the most out of them, you'll need to keep them aimed perpendicular to the sun's rays, or use a steer-able reflector/focusing element(s)
     
  6. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Open circuit voltage of a solar panel can be 33% higher than load voltage. Ratings given in the catalogs are for peak output, and are also subject to a "negative tolerance rating."
     
  7. Gadget

    Distinguished Member

    Jan 10, 2006
    613
    0
    If you are trying to charge a 24 volt battery, your regulator will need to output around 27.6 volts
     
  8. Carlost

    Thread Starter New Member

    Jul 9, 2007
    8
    0
    Would putting more capacitors at the input give me more current on the output?? In parallel or series?
     
  9. Carlost

    Thread Starter New Member

    Jul 9, 2007
    8
    0
    and thanks for your help :)
     
  10. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    More caps won't make a difference. The solar cells use incident light to make both the voltage and current.
     
  11. weide83

    New Member

    Jan 28, 2008
    8
    0
    CHeck out something call MPPT --- max power point tracker... can help to deliver max power
     
  12. mohmart

    New Member

    Mar 31, 2008
    1
    0
    can you please draw for me a block digram for this solar power regulator
     
Loading...