Solar panel model (2 R, a current source and a diode) question

Discussion in 'Homework Help' started by hrstar24, Jan 26, 2011.

  1. hrstar24

    Thread Starter Active Member

    Apr 7, 2009
    32
    0
    I need to figure out the general parameters for a solar panel. Here is the model that I need to use.

    [​IMG]

    I already have this equation, which I believe is correct in order to solve for Icell:

    [​IMG]

    Now, I need to solve for the following parameters: Io, Ido, Rp, and Rs. Ido is the coefficient in the diode equation for Id. I have taken a bunch of points for Vcell and Icell, enough to generate an iv curve. Otherwise, I have no other information given.

    My first line of thought was to figure out Io, by shorting Vcell, so then Icell = Io. After this, I got stuck. Since I only have 3 unknowns left, I was thinking of maybe plugging in 3 different Vcell/Icell pairs into the equation given, and then using a program like MATLAB to churn out the 3 missing variables, but I don't know if this would work.

    Another idea I had was that in my Icell/Vcell curve, the initial nearly flat slope of the plot is equal to 1/Rp, and then the steep slope at the end of the plot is equal to 1/Rs, like shown below:

    [​IMG]

    Will this work?

    Anyone know if there is an easier way to do this without matlab? How do I go about figuring out Ido, Rp, and Rs?
     
    Last edited: Jan 26, 2011
  2. hrstar24

    Thread Starter Active Member

    Apr 7, 2009
    32
    0
    Please anybody help!!
     
  3. hrstar24

    Thread Starter Active Member

    Apr 7, 2009
    32
    0
    Please help! I cannot figure this out!
     
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