Comparative analysis of calculation of solar panel efficiency degradation

Output efficiency of solar panel is degrading day by day due to accumulation of dust and other dirt on PV Panel surface which badly affects the operation of load connected to it. This paper includes a comparative survey of unclean and clean solar PV panels to calculate its output efficiency reduction due to presence of dust and dirt on surface. The main motive behind this survey is to find out minimum acceptable output current referred as ‘threshold current’ by using which multiple applications can be designed in future for solar panel efficiency improvement. In the survey, different sunlight intensities are considered and the effects on panel output were examined practically. On the basis of maximum output power, overall efficiency degradation is calculated mathematically.