@ARTICLE{Rodziewicz_T._Numerical_2019, author={Rodziewicz, T. and Rajfur, M.}, volume={vol. 27}, number={No 2}, pages={149-160}, journal={Opto-Electronics Review}, howpublished={online}, year={2019}, publisher={Polish Academy of Sciences (under the auspices of the Committee on Electronics and Telecommunication) and Association of Polish Electrical Engineers in cooperation with Military University of Technology}, abstract={The article regards aspects of PV modules tested with the use of natural sunlight. The analysis of spectral structure of solar energy resources in southern Poland, carried out on the basis of meteorological data originating from SolarLab PW Wrocław and AGH Kraków, Poland [1] was used in the article. It is a continuation of the article: Analysis of solar energy resources in southern Poland for photovoltaic applications [1], describing the method to determine spectral parameters of average photon energy (APE) and useful fraction (UF) with the use of a solar radiation spectrum simulator. This article, however, includes an experimental presentation of their impact on PV conversion of modules with different absorbers. Theory and practice of the measurements were described with the use of spectral parameters such as: UF, APE. Their influence on the efficiency of modules’ photovoltaic conversion with various spectral characteristics of absorbers was presented. The most recent methods described, which characterise the structure of solar energy resources such as annual distributions of APE and UF, have not been commonly used yet in Poland and other countries, even though they most precisely define adjustment of the spectral factor to the selected PV module. Practical application of UF, in detection of absorber type used in the tested PV module/cell is demonstrated in the final part of the article.}, type={Article}, title={Numerical procedures and their practical application in PV modules’ analyses. Part II: Useful fractions and APE}, URL={http://www.journals.pan.pl/Content/115249/PDF/opelre_2019_27_2_149-160.pdf}, keywords={Sunlight irradiance spectrum, Sunlight irradiance intensity, Irradiance, APE, UF, Solar power, Solar power industry, Photovoltaics}, }