Optimization of commercial rooftop PV systems in the continental united states using angle-and-wavelength-resolved solar irradiance data

Abstract

This paper presents a systematic approach for optimizing commercial rooftop PV system installations, estimating energy yields using more realistic angle-and-wavelength-resolved clear sky solar irradiance data and quantifying the economic benefits. In this paper's case study of Berkeley, the proposed semiannually-fixed tilt configuration of solar panels is found to increase the energy yield by 5.8% over the year and up to 15.6% during peak summer days. This study attempts to quantify both the energy yield and economic benefits of improved angular and spectral response of solar cells. We believe that these sets of information would be important for manufacturers to assess the cost-effectiveness of a certain technological improvement, and for developers to choose the more cost-effective products for installations at a given geographic location. 3 cities varying from N30° to N45° in latitude are covered in this study to represent the typical geographic variations in the lower continental United States. The north-south difference in energy yield due to geographic locations is most significant in winter by about 15%.