Rear-Side Irradiance Simulation of Field PV Modules

Zelin Li, Raymond Wieser, Xuanji Yu, Stephanie Moffitt, Ruben Zabalza, Silvana Ayala, Matthew Brown, Xiaohong Gu, Liang Ji, Colleen O'Brien, Michael Kempe, Laura Bruckman, Kenneth Boyce

Research output: Contribution to conferencePaper


Assessing the durability of photovoltaic (PV) module backsheet is critical to increasing module lifetime. Historically, laboratory-based accelerated testing has insufficient in predicting large-scale failures of commercial polymeric materials. Additionally, there is growing concern that standard condition tests do not reflect non-uniformities in field exposure, and that certain modules experience more severe degradation due to their location. Anisotropy in field exposures is installation-dependent and reflects different levels of exposure to irradiance due to mounting geometry, ground surface albedo, and climatic zone. "Bificial_Radiance" [1], simulates the amount of reflected irradiance on the Polyethylene Naphthalate (PEN) backsheet of a PV array located in Maryland. In our work, site specific weather data are gathered for the entire length of exposure for the modules. The total full-spectrum dose for the incident irradiance on the backsheet was then determined. The simulation results are integrated with historical field survey data to better understand real orld outdoor degradation.
Original languageAmerican English
Number of pages4
StatePublished - 2023
Event50th IEEE Photovoltaic Specialists Conference - San Juan, Puerto Rico
Duration: 11 Jun 202316 Jun 2023


Conference50th IEEE Photovoltaic Specialists Conference
CitySan Juan, Puerto Rico

Bibliographical note

See NREL/CP-5K00-85094 for preprint

NREL Publication Number

  • NREL/CP-5K00-88873


  • backsheet
  • degradation
  • field survey
  • simulation


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