Dark and illuminated characteristics of photovoltaic solar modules. Part I: Influence of dark electrical stress

Abstract

The purpose of this paper is to discuss the effect of electric reverse stress currents on the performance of photovoltaic solar modules. The effect of the reverse stress current induced into the solar cell structure on the IV characteristics and parameters in the dark and illuminated conditions at room temperature for several common periods of time. A digital double exponential model was used to analyze the experimental measurements.The changes in characteristics which are caused from the effect of a reverse current introduced for different stress levels simulated the effect of accumulated extreme reverse currents that can occur in the solar cells and modules as result of shading and other different reasons. The paper contributes to the research on the adverse effects of reverse currents on the normal functioning of cells and solar modules.