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Finding maximum current?

Discussion in 'Electronic Basics' started by D.V., Jul 5, 2003.

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  1. D.V.

    D.V. Guest

    Hi..
    can anyone help mi with design for following device:
    - I have solar panel
    - I have DC motor for rotating the panel
    - Want to rotate it to find maximal output current for charging the
    batteries
    - Device should be capable to find maximum outut voltage from panel and to
    positioning panel at that position.
    Does anyone have some shematic or useful link for that?
    Thank you in advance and sorry for my bad English.
     
  2. Maximum tracking is done with a control loop that has noise inserted.
    But instead of keeping the motors busy, there are better ways
    to set the position.
    But before tracking the position, do you have a switcher to
    optimize the impedance ?

    Rene
     
  3. Add some wobble to the motion and use a PLL to decode it. If there's
    more power on the high swing of the wobble, move it up. If there's more
    power on the low swing of the wobble, move it down. The sun doesn't
    move very quickly so this wobble can be very slow to reduce mechanical
    stress.
     
  4. Optimize the impedance of what? Trying to figure out what you're
    trying to do.

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  5. mike

    mike Guest

    Use a processor. Plot the curve of optimum direction vs time of day in
    mid-season. Offset that curve according to time of year. Position
    the panel according to the clock and the curve. You could do a
    2-dimensional search for a peak near the proposed position, but I'll
    bet you use more power turning the array in the search than you'd gain
    in increased output.
    Obviously, you could be much more sophisticated in computing the
    prediction curves. Optimization is pointless for things that can be
    easily predicted.

    If you only have one motor, you might want to do something more
    complex than a rotation.
    mike

    --
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  6. John Smith

    John Smith Guest


    I agree with this. You would have to have the panel aimed more than 25
    degrees away from the sun to see a 10% loss in available energy. That's a 50
    degree window, or about 1/3 of the sky.

    You appear to live in Croatia, about 45 degrees north latitude. Your biggest
    problem will come in the winter months when the sun gets no more than 22
    degrees above the horizon and the daylight hours are short. You will
    probably do just as well tilting the panel to face the sun at noon on
    December 25 and fix it there.

    In the summer, the sun will be as high as 68 degrees above the horizon at
    your location. With the panel pointed at 22 degrees above the horizon, you
    get a little less than 70% of the available energy. But, the daylight hours
    are much longer. Actually, you could gain some summer energy by adjusting
    the panel to about 30 degrees above the horizon and it would mean only about
    a 1% less energy than the 22 degrees setting, but would increase the summer
    input to 78%.

    Does this make sense?

    Good luck.

    John
     
  7. I found a schematic of one that uses sensors. Do a Google search on
    the title, and when it pops up, click on translate. Or else, run it
    thru Babelfish yourself.

    ROTORE INSEGUITORE DEL SOLE PER PANNELLI FOTOVOLTAICI
    http://www.geocities.com/SiliconValley/Haven/1079/rotopan.ht



    --
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    ###Got a Question about ELECTRONICS? Check HERE First:###
    http://users.pandora.be/educypedia/electronics/databank.htm
    My email address is whitelisted. *All* email sent to it
    goes directly to the trash unless you add NOSPAM in the
    Subject: line with other stuff. alondra101 <at> hotmail.com
    Don't be ripped off by the big book dealers. Go to the URL
    that will give you a choice and save you money(up to half).
    http://www.everybookstore.com You'll be glad you did!
    Just when you thought you had all this figured out, the gov't
    changed it: http://physics.nist.gov/cuu/Units/binary.html
    @@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@
     
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