Suggested Modifications for Bifacial Capacity Testing

Martin Waters, Chris Deline, Johan Kemnitz, Jeffrey Webber

Research output: Contribution to conferencePaperpeer-review

8 Scopus Citations


Capacity tests such as those described in ASTM 2848 and IEC 61724-2 are widely used during the contracting and acceptance testing of photovoltaic systems. With the increasing deployment of bifacial photovoltaic modules, there is a need to develop a standardized approach to capacity test these systems. Although variability and bias error were inherently higher for the measured capacity of bifacial systems, they could be reduced to a level consistent with the monofacial reference system by appropriate incorporation of rear irradiance-either measured or modeled. Three field installations provided bifacial system capacity that was measured with a mean bias error and standard deviation within 1 over the 2-10-month observation period. Capacity test accuracy could be improved furtherby using the measured back-of-module temperature and the IEC 61724-2 test method for well curated systems.

Original languageAmerican English
Number of pages6
StatePublished - Jun 2019
Event46th IEEE Photovoltaic Specialists Conference, PVSC 2019 - Chicago, United States
Duration: 16 Jun 201921 Jun 2019


Conference46th IEEE Photovoltaic Specialists Conference, PVSC 2019
Country/TerritoryUnited States

Bibliographical note

See NREL/CP-5K00-73982 for preprint

NREL Publication Number

  • NREL/CP-5K00-78481


  • ASTM 2848
  • bifacial photovoltaics
  • capacity test
  • IEC 61724-2


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