Backsheet

The backsheet is a crucial component in photovoltaics and is located on the rear side of a solar panel. This protective layer, typically made from a polymer or a combination of various polymers, serves several important functions:

  • Protection from environmental influences: The backsheet protects the sensitive solar cells from moisture, UV radiation, dirt, and other environmental factors that could affect the module's performance and lifespan.
  • Mechanical stability: It contributes to the mechanical stability of the module and protects it from damage caused by hail, wind, or other external forces.
  • Electrical insulation: The backsheet acts as an electrical insulation layer, preventing short circuits.
  • Moisture barrier: It functions as a moisture barrier, preventing moisture from penetrating the interior of the module, which could lead to corrosion and performance loss.

Materials:

Various materials are used in the production of backsheets, including:

  • Tedlar: A fluoropolymer known for its high resistance to UV radiation, moisture, and chemicals.
  • EVA: Ethylene-vinyl acetate, a thermoplastic material used as an adhesive and sealant.
  • PET: Polyethylene terephthalate, a polyester known for its strength and transparency.

Key Properties:

  • Durability: A high-quality backsheet must have a long lifespan to ensure the longevity of the entire solar module.
  • Resistance to aging: The material should be resistant to aging processes to maintain its protective function over many years.
  • Flexibility: The backsheet must be flexible enough to withstand the thermal expansions and contractions of the module.

Impact on Module Performance:

The quality of the backsheet has a direct impact on the performance and lifespan of a solar module. A defective or low-quality backsheet can lead to performance losses, accelerated degradation, and premature module failure.

Conclusion:

The backsheet is an inconspicuous yet essential component of a solar module. Its properties and quality significantly influence the performance and longevity of the entire photovoltaic system.

Additional keywords: solar panel, photovoltaics, polymer, UV radiation, degradation