Partial-Shading Assessment of Photovoltaic Installations via Module-Level Monitoring: Preprint

Christopher Deline, Alex Hanson, Jason Stauth, Charles Sullivan

Research output: Contribution to conferencePaper


Distributed Maximum Power Point Tracking (DMPPT) is a topic of much interest in improving photovoltaic (PV) system performance. This study uses measured performance data at the module level for 542 PV systems to estimate lost system performance due to partial shade. Because each of the monitored systems is equipped with module-level DC power optimizers, an estimate is made of the overall systemshading loss and the performance improvement that the system has received from this use of DMPPT. The estimate of shade extent and performance improvement predicted by this approach is verified experimentally against a system that has site survey images, and measured production with and without module-level electronics.
Original languageAmerican English
Number of pages9
StatePublished - 2015
Event40th Photovoltaic Specialist Conference (PVSC) - Denver, Colorado
Duration: 8 Jun 201413 Jun 2014


Conference40th Photovoltaic Specialist Conference (PVSC)
CityDenver, Colorado

NREL Publication Number

  • NREL/CP-5J00-63765


  • DC power optimizers
  • distributed power electronics
  • partial shading
  • PV system performance


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