Effect of Torque-Tube Parameters on Rear-Irradiance and Rear-Shading Loss for Bifacial PV Performance on Single-Axis Tracking Systems

Silvana Ayala Pelaez, Chris Deline, Joshua Stein, Bill Marion, Kevin Anderson, Matthew Muller

Research output: Contribution to conferencePaperpeer-review

9 Scopus Citations

Abstract

The emergence of cost-competitive bifacial PV modules has raised the question of the additional value of bifacial 1-axis tracking arrays, in particular when considering rear-irradiance losses from the tracker system itself. In this work, the effect of different geometries and materials of torque tubes is evaluated through ray-trace simulations and found to cause rear irradiance shading factors between 2 to 8 for systems without gap between the modules in 2-UP configuration. Inclusion of a gap between the modules can offset the shading factor. Electrical mismatch is also evaluated for the various configurations, and a methodology to apply shading factor and electrical mismatch loss to rear irradiance from the calculated loss in DC power, which averages 1% for the systems explored here, is proposed.

Original languageAmerican English
Pages3525-3530
Number of pages6
DOIs
StatePublished - Jun 2019
Event46th IEEE Photovoltaic Specialists Conference, PVSC 2019 - Chicago, United States
Duration: 16 Jun 201921 Jun 2019

Conference

Conference46th IEEE Photovoltaic Specialists Conference, PVSC 2019
Country/TerritoryUnited States
CityChicago
Period16/06/1921/06/19

Bibliographical note

See NREL/CP-5K00-73203 for preprint

NREL Publication Number

  • NREL/CP-5K00-78468

Keywords

  • bifacial PV module
  • irradiance
  • model
  • performance
  • ray-tracing
  • single-axis tracking
  • torque tube

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