| Summary: | 碩士 === 國立臺南大學 === 綠色能源學科技學系碩士在職專班 === 105 === Dust accumulation on the surface of the solar panel decreases the power generation efficiency, which may result in financial losses. The dust on the surface of the solar panel can be washed down by rain. However, more rainfall threshold is needed as more dust is accumulated on the solar panels. The purpose of this study was to understand how precipitation may influence the power generation efficiency of the solar panel. Thirteen-month data (from December 2013 to December 2014) from the Rende station located in Tainan City were used and retrieved from the Central Weather Bureau and the photovoltaic module remotely monitored by Solar Bank, respectively. The daily accumulated precipitation amount and daily average solar photovoltaic array ratio (RA) were used as study variables analyzed by descriptive statistics and regression analysis. The findings were presented based on the dry season and wet season. During the dry season, the power efficiency was decreased by 4.2% of RA per month and the dust accumulation on the surface of the solar panel can be washed down by a single precipitation with 0.5 mm. During the wet season, the solar power efficiency was decreased due to the wet deposition. Overall, the solar power efficiency remains below 100% during either dry or wet season which could be contributed to that the precipitation was not able to complete wash out the dust on the solar panels. In 2014, the optimal RA observed from the Rende station was 98.08%.
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