THE SCIENCE OF BACKSHEET

THE SCIENCE OF BACKSHEET

The Role of Backsheets in PV Manufacturing

The primary function of the PV backsheet material is to offer protection to the solar module’s various components throughout its lifetime. This in turn ensures loss-free energy generation for the solar panel. The active electrical elements found within the modules must also be insulated to ensure the safety of surroundings. Some of their key functions include:

  • Physical protection
  • Moisture protection
  • Durability
  • Electrical insulation
  • Efficiency to help modules generate more power

Solar panel module manufacturers have a wide choice of backsheets from all over the world. They all use different components and layer constructions for their modules. Selecting the right backsheet for a specific module design is often complex, time-consuming and expensive. But, making the right choice will ultimately impact the module’s ability to perform under extreme conditions. We, at Shingi Urja, completely understand the impact of a backsheet on a module’s performance and are trying to make a sincere attempt to spread awareness about the backsheet’s importance and its effects on the solar modules:

National Centre for Photovol (NCPRE), IIT Bombay & Solar Energy Centre, Gurgaon titled “India Survey of Photovoltaic Module Degradation: 2013” research work regarding how moisture in Indian sub continent can have adverse effects on the solar modules:

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Correlation study of damp heat testing and pressure cooker testing on backsheets. This research work helps us understand why pressure cooker tests can be used as an accelerated test method for a quick analysis for backsheet quality:

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No matter what the solar backsheet is made up of, it’s moisture vapour transmission rate needs to be given a serious thought:

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This research work indicates that if the backsheet contains PET as core layer; no matter what the outer and inner layers are, it’s hydrolysis will eventually take place, resulting in cracking of backsheet leading to efficiency drop of the solar module and sometimes module degradation as well

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