Impact of Light Source Spectrum in Laboratory Test of Commercially Available Photovoltaic Panels

The output power measured during photovoltaic modules exposure to the artificial electric lighting sources significantly differs from the values that could be obtained by an equivalent exposure to solar light. The difference depends mainly on the type of photovoltaic cell used and light source. During the measurements, it should pay attention to that the spectra of individual light sources may differ from the spectral distribution of solar radiation. In this paper, the effects of the solar spectral on the photovoltaic modules performance have been presented. The results are based on indoor made measurements at different temperature of photovoltaic surface.