Suggested Modifications for Bifacial Capacity Testing: Preprint

Christopher Deline, Martin Waters, Johan Kemnitz, Jeffrey Webber

Research output: Contribution to conferencePaper


Capacity tests such as those described in ASTM 2848 and IEC 61724-2 are widely used during the contracting and acceptance testing of PV systems. With the increasing deployment of bifacial PV modules, there is a need to develop a standardized approach to capacity test these systems. Although variability and bias error was inherently higher for the measured capacity of bifacial systems, it 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 further by utilizing measured back-of-module temperature and the IEC 61724-2 test method.
Original languageAmerican English
Number of pages9
StatePublished - 2019
Event46th IEEE Photovoltaic Specialists Conference (PVSC 46) - Chicago, Illinois
Duration: 16 Jun 201921 Jun 2019


Conference46th IEEE Photovoltaic Specialists Conference (PVSC 46)
CityChicago, Illinois

Bibliographical note

See NREL/CP-5K00-78481 for paper as published in proceedings

NREL Publication Number

  • NREL/CP-5K00-73982


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


Dive into the research topics of 'Suggested Modifications for Bifacial Capacity Testing: Preprint'. Together they form a unique fingerprint.

Cite this