Abstract
The effect of dust settlement on the efficiency of photovoltaic modules was measured. To gain a deeper insight into the problem the physical properties of the collected dust were examined using a scanning electron microscope (SEM). A potential solution for the phenomenon, namely the usage of special coatings on the cover glass, was investigated. The results show a constant power loss between 3% and 4% for the optimal tilt angle and regular rainfall. Rain seems to have little cleaning effect on smaller dust particles (<10 µm), but on bigger particles (like pollen, ∼60 µm) the effect was clearly visible.
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