Effects of irradiance and other factors on PV temperature coefficients
- 9 December 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 608-613
- https://doi.org/10.1109/pvsc.1991.169283
Abstract
Analysis of data from several Photovoltaics for Utility Scale Applications (PVUSA) systems suggested diminishing sensitivity of array power to temperature with decreasing irradiance. At low irradiance a reversal of sign of the temperature coefficient, beta , was noted indicating increasing array power with temperature. Evaluation of a simple PV system power model suggested a strong relationship between incidence angle and the model's increasing error at low irradiance. Indoor tests confirmed that beta is insensitive to irradiance and indicated a decrease in module performance beyond normal cosine losses at high incidence angles (>60 degrees ).Keywords
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