Title :
Effects of irradiance and other factors on PV temperature coefficients
Author :
Whitaker, C.M. ; Townsend, T.U. ; Wenger, H.J. ; Iliceto, A. ; Chimento, G. ; Paletta, F.
Author_Institution :
Endecon, San Ramon, CA, USA
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, β, 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 β is insensitive to irradiance and indicated a decrease in module performance beyond normal cosine losses at high incidence angles (>60°)
Keywords :
solar cell arrays; PV temperature coefficients; array power sensitivity; irradiance effects; temperature coefficient; Amorphous materials; Circuit testing; Data analysis; Photovoltaic cells; Power system modeling; Short circuit currents; Silicon; Temperature sensors; Test facilities; Voltage;
Conference_Titel :
Photovoltaic Specialists Conference, 1991., Conference Record of the Twenty Second IEEE
Conference_Location :
Las Vegas, NV
Print_ISBN :
0-87942-636-5
DOI :
10.1109/PVSC.1991.169283
