Ultimate Bifacial Showdown: 75kW Field Results

Silvana Pelaez, Chris Deline, Bill Marion, Bill Sekulic, Byron McDanold, Joshua Parker, Mark Monarch, Joshua Stein

Research output: NRELPresentation


This work presents one year results for a side-by-side comparison of 5 different bifacial technologies, deployed in a 75-kW single-axis tracked field at Golden, CO. Four PERC (multi and mono) and 1 Silicon Heterojunction manufacturers are represented. Reference strings of equivalent monofacial PV modules are also installed for a direct technology comparison and calculation of bifacial gain. Analysis indicates performance within expectation, with a cumulative model mean error within +/- 2% for both bifacial and monofacial models and cumulative bifacial energy gain between 6-9%. High accuracy string-level DC monitoring and module-level measurements are also presented, showing effects of snow and edge effects in the order of +/- 3% for non-uniform irradiance across the row. Data from a custom-module to measure shading loss from the torque-tube is installed, showing up to 6% irradiance non-uniformity for the month of January.
Original languageAmerican English
Number of pages35
StatePublished - 2020

Publication series

NamePresented at the Bifacial PV Workshop 2020, 27-28 July 2020

NREL Publication Number

  • NREL/PR-5K00-77486


  • bifacial field validation
  • bifacial PV
  • due diligence software
  • open source PV modeling
  • ray tracing
  • view factor models


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