Soiling

Sand and dust are a PV plant operator’s worst nightmare. Performance losses due to soiling, or “the dust effect,” are a cause for innovation among O&M providers, particularly in dry and dusty regions that are otherwise ideal locations for large-scale solar installations. Yazeed Al-Mousa examines the latest robotic cleaning solutions, as well as the software and sensors that help plant operators with the tricky economic decision of when to actually start cleaning.

The handheld, cordless cleaning tool is a cost-effective and efficient alternative to automated cleaning robots that are usually limited in operation by panel inclination. 

Anil Kottantharayil currently leads the Centre for Research in Nanotechnology and Science, as well as the Sophisticated Analytical Instrument Facility, at the Indian Institute of Technology (IIT) Bombay. He works on high-efficiency crystalline silicon solar cells, the impact of dust on solar panels, and the long-term reliability of photovoltaic modules.

A group of scientists in Bangladesh has developed a model to determine the optimal cleaning schedule for a PV installation at any location in the globe, requiring only the average insolation and soiling rate for a given site to make the calculation. The study also draws new conclusions regarding the influence of sandstorms and rain on soiling, and aims to be among the first studies to paint a global picture of soiling trends by region.

Scientists in the U.K. have developed a system which makes panels vibrate to provide cleaning. The academics have conceded, however, they are yet to calculate the ‘sweet spot’ of mechanical stress to be applied.