Solar Cell with cftool
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Hi! I am currently trying to use the curve-fitting toolbox to find values for solar cell specs such as the dark current saturation, shunt resistance, and so on. My equation is: -iP + iSat*(exp(38.66976*x/n)-1) +x/Rshunt = y , where x is the voltage and y is the current.
For those of you who may not know, the dark current saturation (iSat) is often extremely small, somewhere between 1e-15 and 1e-5. The toolbox seems to not work very well with such small numbers, it gives me numbers all over the place and often when I push the fit around by changing the restrictions on the variables it improves drastically. I was able to estimate the Rshunt, but the iSat and n values are giving me trouble. Is there any way to make the curve fitting toolbox work better with very small numbers?
Thank you!
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Veera Kanmani
le 20 Avr 2018
https://in.mathworks.com/matlabcentral/fileexchange/31305-simple-solar-cell-and-panel-model?focused=5187488&tab=function
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