Finding series and shunt resistance of solar cell

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SUMMARY

The discussion focuses on calculating the series and shunt resistance of a solar cell using its I-V curve. The user applies the formulas Rs = -(dv/dI)V=Voc and Rsh = -(dv/dI)I=Isc, deriving Rs from the slope between Vmax and Voc, and Rsh from Isc to Vmax. However, the user expresses concern over an unusually high series resistance value of 11k ohms and questions the relationship between Vmax and Voc. It is clarified that the slope should be determined by drawing a tangent at Voc for accurate results.

PREREQUISITES
  • Understanding of I-V curve analysis in solar cells
  • Familiarity with the concepts of series and shunt resistance
  • Knowledge of calculus for slope determination
  • Experience with solar cell performance metrics such as Isc and Voc
NEXT STEPS
  • Study the method for accurately determining the slope at Voc using tangent lines
  • Research the impact of series and shunt resistance on solar cell efficiency
  • Explore advanced I-V curve analysis techniques for solar cells
  • Learn about the effects of temperature and illumination on solar cell performance
USEFUL FOR

Electrical engineers, solar energy researchers, and technicians involved in solar cell testing and optimization will benefit from this discussion.

Swati Jain
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Hi,
I am trying to find out series and shunt resistance of solar cell from I-V curve which starts from Isc and going to Voc.

I read some papers and for single illumination mostly said Rs= -(dv/dI)V=Voc
and Rsh= -(dv/dI)I=Isc.
so I am finidng Rs from slope between points from Vmax to Voc, and Rsh from Isc to Vmax.
Am I doing something wrong? My series resistance is coming very high around 11k ohm.
 
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Swati Jain said:
I am finidng Rs from slope between points from Vmax to Voc
Aren't Vmax and Voc going to be the same point??

Seems to me if you need the slope around Voc then you draw a tangent there.
 

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