Soiling losses for solar photovoltaic systems in California

摘要: Soiling Losses for Solar Photovoltaic Systems in California Felipe A Mejia, Jan Kleissl Keywords: Soiling, PV Performance Center Renewable Resources and Integration, Department of Mechanical Aerospace Engineering, University California, San Diego 9500 Gilman Dr., La Jolla, CA 92093, USA Abstract is the accumulation dust on solar panels that causes a decrease photovoltaic (PV) system’s efficiency. The changes conversion efficiency 186 residential commercial sites were quantified during dry periods over course 2010 with respect to rain events observed at nearby weather stations using satellite resource data. losses averaged 0.051% per day overall 26% had greater than 0.1% day. Sites small tilt angles (<5 o ) larger soiling while differences by location not statistically significant. 1. Introduction With rapid increase use power which has 47% installed capacity US, optimal management analysis expected performance becomes increasingly important. can have large effect long droughts[1], mainly occur summer season coincident largest resource. Dust from air pollution particles, sea salt, pollen, agricultural activity, construction other anthropogenic natural sources accumulates until it removed either or washing. Research primarily been conducted middle-east [2] due aerosol loading abundance plans concentrating plants are much more affected soiling. For desalination plant Abu Dhabi, UAE was found be strongest sandstorms [3]. transmittance glass after 30 days exposure India decreased 90% 30% horizontal 88% vertical [4]. Another recent study examined effects 250 monitored PowerLight (now SunPower) [1]. Since several these areas frequent their focused southwestern United States where droughts common. They also excluded an R 2 value between energy time less 0.7 left total 46 sites. Between events, aggregate linearly average daily loss 0.2%. While this paper provides methodological foundation analyzing losses, site selection criteria may led overestimate losses.