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This is all great. One very imporatnt information which is missing is domain of the model and its accuracy. E.g. I'm thinking now about using single-module optimizers and would like to model single/multiple cell shading. This puts takes the model from the first quadrant. Is the model valid also in other quadrants?
It's an excellent model provided you realize that the photocurrent is proportional to incident light. If it's shaded, the cell will dissipate power like a diode or resistor if it's shunted.
based on the explanation in previous video, I believe by virtue of the pn junction required to create a physical solar cell, it can be modelled as a power source in parallel with the diode. Not sure if this answers your question. Varun
