PERFORMANCE OF PV MODULES FABRICATED IN DIFFERENT TECHNOLOGIES AT STRONGLY CHANGEABLE INSOLATION CONDITIONS

摘要

The work presents analysis of some data gathered during prolonged outdoor tests performed by two monitoring systems (one located on the roof of University of Opole and the other at Solar Lab in Wroclaw) on several commercially available PV modules. The following types of the modules have been chosen for experiments: medium quality 30 Wp single crystal silicon (c-Si), 22 Wp multicrystalline silicon (mc-Si), 24 Wp thin-film amorphous silicon (a-Si) and 20 Wp thin-film CIS module. In the first step numerical simulation of the expected solar spectrum during long periods in Opole (south-west of Poland) has been done and then behaviour of the tested modules have been predicted assuming for calculations typical spectral curves corresponding to semiconductor material they were manufactured of. Simulation results have been experimentally confirmed showing that straightforward prediction of photocurrent and efficiency values and hence cumulated amount of either charge or energy generated by a PV modules during particular days and months can not be done just using parameters measured under Standard Test Conditions (STC) usually specified by module's manufacturer. The spread of obtained data is particularly high for low irradiance conditions characterized by high value of the Air Mass factor.