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Solar Cell with cftool

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mkeehan on 13 Jul 2011
Answered: Veera Kanmani on 20 Apr 2018
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!

Answers (1)

Veera Kanmani
Veera Kanmani on 20 Apr 2018

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