SPLTRAK Abstract Submission
Reference Cell Performance and Modeling on a One-Axis Tracking Surface
Frank Vignola1, Josh Peterson1, Rich Kessler1, Sean Snider2, Peter Gotseff3, Manajit Sengupta3, Aron Habte3, Afshin Andres3, Fotis Mavromatakis4
1University of Oregon, Eugene, OR, United States
/2St Mary's High School, Medford, OR, United States
/3National Renewable Energy Laboratory, Golden, CO, United States
/4Hellenic Mediterranean University, Heraklion, Greece

Performance of five silicon-based reference cells is examined on a single-axis tracking surface.  The reference cells’ output are modeled using one-minute sampled spectral irradiance and reference cell temperature measurements. The model also incorporates spectral responsivity data for the reference cell. The transmission of light through the glazing multiplies the sum over all appropriate wavelengths of temperature adjusted reference cell responsivity times the measured spectral irradiance. Modeled reference cell output is compared with measured reference cell output under clear sky and totally cloudy sky conditions.  For each reference cell the ratio of modeled to measured output varies by less than 2% over the year.