Quantification of a Minimum Detectable Soiling Level to Affect Photovoltaic Devices by Natural and Simulated Soils

摘要: Soil accumulation on photovoltaic (PV) modules presents a challenge to long-term performance prediction and lifetime estimates due the inherent difficulty in quantifying small changes over an extended period. Low mass loadings of soil are common occurrence but remain difficult quantify. In order more accurately describe specific effects sparse films PV systems, we have expanded upon earlier technique measure optical losses artificially applied obscurant film. A synthetic analog was sprayed onto glass coupons at very brief intervals with high-volume, low-pressure pneumatic sprayer. Light transmission through grime film evaluated using quantum efficiency test stand UV/vis spectroscopy. 0.1-g/m $^2$ loading determined be limit measurement sensitivity, which is similar some reports daily accumulation. Predictable, linear decreases were observed for samples between 0.1 0.5 g/m . change soiled from outdoor monitoring station. Collected field analyzed develop compositional indoor studies. Natural soils produced transmission.