Abstract
SYNOPSIS The effect of accumulation of atmospheric dust particles onto the surface of photovoltaic cells has been examined, and the permissible reduction in the power output was determined along with the associated dust deposition density. The annual patterns of dustfall over six different districts in the City of Riyadh which were previously measured by the author have been used to determine dustfall dependence for three groups of months over the year. A method for determining the frequency of cleaning the surface of photovoltaic cells is presented and used to determine the periods between cleaning during each group of months. The determination of such periods is based on the dust deposition density which would result in the maximum allowable power output reduction and the rate of dustfall during each group of months.
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