Angle of incidence effect on five soiled modules from five different PV technologies

Vidyashree Rajasekar, Sravanthi Boppana, Govindasamy Tamizhmani

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Scopus citations


Higher the angle of incidence (AOI), lower will be the photovoltaic (PV) module performance. The AOI investigation for cleaned modules of five different technologies with air/glass interface has already been reported by our research group. However, the modules that are installed in the field would invariably develop a soil layer with varying thickness depending on the site condition, rain fall and tilt angle. The soiled module will have the air/soil/glass interface rather than air/glass interface. This study investigates the AOI variations on soiled modules of five different PV technologies. It is demonstrated that AOI effect is inversely proportional to the soil density - in other words, the power or current loss between clean and soiled modules would be much higher at a higher AOI than at a lower AOI leading to excessive energy production loss of soiled modules on cloudy days, early morning hours and late afternoon hours. Also, in this study, we show that the critical angle shifts from 57° for the clean air/glass interface to 40° for the naturally developed air/soil/glass interface in Mesa, Arizona for the fall season.

Original languageEnglish (US)
Title of host publication2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479979448
StatePublished - Dec 14 2015
Event42nd IEEE Photovoltaic Specialist Conference, PVSC 2015 - New Orleans, United States
Duration: Jun 14 2015Jun 19 2015


Other42nd IEEE Photovoltaic Specialist Conference, PVSC 2015
Country/TerritoryUnited States
CityNew Orleans


  • angle of incidence
  • interface
  • photovoltaic
  • soiling

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials


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