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PV Backsheet Performance Test Results - Proven Performance of Tedlar®

DuPont™ Tedlar® polyvinyl fluoride (PVF) film has been the choice of leaders in the solar energy market for its proven performance over time. Tedlar® is the only material with more than 25 years of success in the field and no other material can match that successful track record.

PV backsheets containing Tedlar® films provide long-term durability in all-weather conditions ensuring reliable, high efficiency performance for the expected 25+ year life of photovoltaic modules. This results in lower cost photovoltaic power and improved returns for investments in solar energy projects.

Longer Life Systems 

  A 30 yr life span results in an LCOE of 10.76 ¢/kWh. As per DOE, the
  2008 average U.S. electricity rates are as follows.
  Utility
  Commercial
  Residential
  7.01 
  10.28 
  11.36
  ¢/kWh
  ¢/kWh
  ¢/kWh

As the leading global supplier of materials to the PV industry, DuPont knows how much materials matter towards ensuring long-term system reliability. That’s why we are completing extensive testing to determine how material performance relates to and can ultimately benefit module performance.

To date, DuPont has tested a broad range of commercially available backsheet constructions, including several that contain Tedlar® and many competitive backsheets that do not. Each was evaluated on a range of critical properties, exposure tests, and a visual inspection, using the same structure and same conditions for a true side-by-side comparison.

The results speak for themselves: Under normal, as well as extreme UV and damp heat exposure, Tedlar® PV backsheets resist delamination, yellowing and degradation that compromise other backsheet materials. An overall summary of the results is shown below.

Failure Modes of Competing PET Backsheet Film

PET Backsheet Failure Modes

Backsheet Competitive Benchmarking Perfomance

For a more detailed review of the test results and background, please download the Expert View as well as the detailed findings.

A broad range of properties must be considered when designing a PV module. Testing backsheet materials for the stability of properties under accelerated conditions is important for predicting long-term reliability. The challenge is in understanding the correlation between the performance of the materials and the performance of the module. Research findings from studies like this can help guide materials choices of construction to ensure long-term module performance.

To futher understand the correction between material and module performance, we are currently conducting module testing and accelerated aging testing. We hope to publish those results as well once the study is complete.