Indoor Soil Deposition Chamber: Evaluating Effectiveness of Antisoiling Coatings

Praveen Ravi, Mathew Muller, Lin J. Simpson, Darshan Choudhary, Shanmukha Mantha, Sai Subramanian, Shalaim Virkar, Telia Curtis, Govindasamy Tamizhmani

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


An indoor soil deposition method has been developed to simulate natural soil deposition on glass coupons or one-cell and multicell photovoltaic (PV) modules. This method uses variable ambient humidity, coupon/module temperature, and dust composition within a single custom-made chamber to create a natural and uniform soil deposition layer. Antisoiling (AS) coatings from two different manufacturers were applied on two one-cell monocrystalline silicon modules. Three layers of Arizona road dust have been deposited on the one-cell modules with AS coatings and an uncoated one-cell reference module at varied humidity levels. The soiled modules were exposed to an open-circuit subsonic wind tunnel at varying speeds and the effectiveness of AS coatings have been quantified using the transmittance gain. Transmittance loss resulting from the AS coating has been measured and compared with the transmittance of the uncoated reference module using a reflectance spectrophotometer. Reflectance measurements have also been taken to compare the transmittance loss of Arizona road dust and soil collected from PV modules' superstrates. The soiled one-cell modules were then exposed to rain from a rain simulator. The transmittance gain due to rain exposure is quantified using a rain gain and rain coefficient. These tests cumulatively may be used to help develop a test standard for evaluating the effectiveness of AS coatings.

Original languageEnglish (US)
Article number8520901
Pages (from-to)227-232
Number of pages6
JournalIEEE Journal of Photovoltaics
Issue number1
StatePublished - Jan 2019


  • Antisoiling (AS) coating
  • rain coefficient
  • rain gain
  • soiling loss
  • transmittance
  • wind coefficient
  • wind gain

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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