Research of material and power of photovoltaic panels of various types of degradation in operating conditionsPeter Tauš, Jana Tomčejová, Marcela Taušová, Ľubomíra Gabániová, Dušan Kudelas, Matúš Jeňo and Daniel ŠlosárMATEC Web Conf., 168 (2018) 06008DOI: https://doi.org/10.1051/matecconf/201816806008