Partially Shaded Operation of a Grid-Tied PV System

Research output: Contribution to conferencePaperpeer-review

87 Scopus Citations


Partial shading of a PV installation has a disproportionate impact on its power production. This paper presents background and experimental results from a single string grid-tied PV system, operated under a variety of shading conditions. In this configuration a shadow can represent a reduction in power over 30 times its physical size. Results are presented relating size and positions of shading to power reduction of the PV system. A simulation method is also described that provides an accurate description of shade based on a single site survey. This process can provide the basis for an accurate simulation of power reduction in a partially shaded PV system.

Original languageAmerican English
Number of pages6
StatePublished - 2009
Event2009 34th IEEE Photovoltaic Specialists Conference, PVSC 2009 - Philadelphia, PA, United States
Duration: 7 Jun 200912 Jun 2009


Conference2009 34th IEEE Photovoltaic Specialists Conference, PVSC 2009
Country/TerritoryUnited States
CityPhiladelphia, PA

Bibliographical note

For preprint version see NREL/CP-520-46001.

NREL Publication Number

  • NREL/CP-520-44874


  • photovoltaics
  • solar energy


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