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U.S. Department of Energy awards study of bifacial PV technology, which could prove a 10% increase in energy output

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Tara Doyle Tara Doyle
Head of Section, Business Development & Project Management
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Bifacial PV technology
Research study by DNV GL will be the most comprehensive energy yield analysis for bifacial PV modules to date
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OAKLAND, CA, U.S. – 19 November 2018 - DNV GL, the world’s largest resource of independent energy experts and certification body, announced that it was selected to receive a USD 200,000 award from the U.S. Department of Energy (DoE) Solar Energy Technologies Office (SETO) for a photovoltaic (PV) research project of bifacial PV technology. 

Bifacial PV modules have the potential to increase energy output by 5-10 percent annually in many locations. To achieve commercial viability, the products need to demonstrate their bankability. Common testing models, have begun to incorporate bifacial models. However currently only little validation data for bifacial PV modules exists, which also often lacks third-party evaluation.

The project will validate energy models created for bifacial PV modules by commissioning a large-scale comparative energy yield analysis and creation of energy simulations in PVsyst software, based on the collected field data.

“This study represents the most comprehensive comparative energy yield analysis for bifacial PV modules to date,” said Richard S. Barnes, Executive Vice President, DNV GL – Energy, North America. “Because the solar industry is projected to grow rapidly, it is necessary to understand how new technologies, like bifacial PV modules, will perform.”

“The aim of the study is to accelerate commercial deployment of bifacial PV modules at scale,” said Tara Doyle, head of business development for DNV GL’s PV module testing lab. “If proven viable through extensive performance and reliability testing, bifacial PV modules have the potential to become the preferred technology for ground-mounted PV installations around the world.” 

The project will entail collection of field data over the course of one year at DNV GL’s outdoor solar test facility in Davis, California. It will include bifacial and monofacial 1500 V PV modules provided by LONGi Solar, Astronergy Solar, Hanwha Q CELLS and Trina Solar, tested on single-axis trackers provided by solar tracking company NEXTracker, and two albedo ground types. Data acquisition will be highly granular, using actively calibrated equipment. The collected measurements will be used to generate PAN files and subsequent energy simulations in PVsyst. 

“Bifacial delivers proven performance with increased energy yield in PV systems, especially in purpose-designed single-axis trackers,” said Dan Shugar, NEXTracker CEO. “World class measurement and verification testing is very helpful to validating the technology, and we’re very pleased to be a part of this important project with DNV GL. It is wonderful that this test is happening at the site in Davis, which has the pedigree of one of the largest collaborations of early PV system testing dating back to the mid-eighties.”

The validation study was awarded as part of the U.S. Department of Energy’s allocation of USD 27.7 million for photovoltaics research and development, issued in conjunction with USD 25.1 million to projects that address other aspects of solar development. Along with other awarded projects that address bifacial PV technology, this study aims to accelerate the commercial adoption of reliable, high-performance PV systems by providing comprehensive field data, data analysis, and PVsyst models that will validate the relevant work that has been done to date.

“Energy modelling validation for bifacial PV modules and systems is needed to provide assurance to owners and financiers that PV systems using this technology will yield expected energy gains,” said Frank Faller, vice president, technology at 8Minutenergy, one of the largest utility scale developers in the U.S. “DNV GL Labs’ study is an important step toward addressing the lack of commercially representative, high-quality field data that’s required to validate contemporary energy models and thus accelerate the bankability of this technology.”

DNV GL was selected as a part of the Energy Department’s FY2018 SETO funding program, an effort to invest in new projects that will lower solar electricity costs and support a growing solar workforce. DNV GL is one of several photovoltaics research projects that will focus on improving the performance and reliability of PV cells, modules, and systems and reducing materials and processing costs.

About DNV GL
DNV GL is a global quality assurance and risk management company. Driven by our purpose of safeguarding life, property and the environment, we enable our customers to advance the safety and sustainability of their business. We provide classification, technical assurance, software and independent expert advisory services to the maritime, oil & gas, power and renewables industries. We also provide certification and supply chain services to customers across a wide range of industries. Operating in more than 100 countries, our experts are dedicated to helping customers make the world safer, smarter and greener.

DNV GL in the power and renewables industry
DNV GL delivers world-renowned testing and advisory services to the energy value chain including renewables and energy management. Our expertise spans onshore and offshore wind power, solar, conventional generation, transmission and distribution, smart grids, and sustainable energy use, as well as energy markets and regulations. Our experts support customers around the globe in delivering a safe, reliable, efficient, and sustainable energy supply.

Learn more at dnvgl.com/energy.

About the Solar Energy Technologies Office
The U.S. Department of Energy Solar Energy Technologies Office supports early-stage research and development to improve the affordability, reliability, and performance of solar technologies on the grid. Learn more at energy.gov/solar-office

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