Preliminary Results of the Fifth International Spectroradiometer Comparison for Improved Solar Spectral Irradiance Measurements

The wider portfolio of today's available photovoltaic (PV) technologies on the market makes the measurement of the spectral content of the incoming sun or artificial light a key parameter for the characterization, calibration, and energy yield estimation of these devices. At present there is a growing request for harmonization of good measurement practices and for knowledge transfer in the field of spectrally resolved solar radiation for solar energy applications (e.g. photovoltaics) in order to make these measurements comparable and directly traceable to SI units. A group of European research institutes active in the PV field for research, characterization and engineering, set up the fifth comparison of spectroradiometers for solar spectrum measurements. In this paper the preliminary results of such exercise are reported.