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I've the following equivalent circuit of an solar cell (I found it on this website, the online calculator):

enter image description here

And I have a few questions about that:

  1. How many of these circuits are there in one solar panel of size $\text{w}\cdot\text{l}$?
  2. How can I find $\text{A}$ out of $\text{mA}/\text{cm}^2$, can I just multiply the size of the panel by $\text{mA}/\text{cm}^2$?
  3. At the calculator they found that when $\text{V}=0$ then $\text{J}=38.0\space\text{mA}/\text{cm}^2$ but when I tried to find that, out of the equations that are listed at the website above (under the part 'about'), $\text{J}=-38.0\space\text{mA}/\text{cm}^2$ so which one is right?
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closed as off-topic by Hritik Narayan, user259412, David Hammen, Jon Custer, Yashas May 30 '17 at 3:46

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