What is the role of backsheet in a solar module?

The role of the backsheet in a solar module is primarily to prevent moisture ingress. It serves as a protective layer that safeguards the internal components of the solar panel from environmental factors, including moisture, chemicals, and UV radiation, which can damage the solar cells and reduce the module's performance and lifespan. The backsheet is typically made from durable materials that provide electrical insulation as well, enhancing the overall safety and functionality of the solar module.

The other options do not accurately reflect the primary functions of the backsheet in solar modules. While a backsheet does contribute to the overall durability and integrity of the module, its main job is to act as a barrier to moisture, ensuring that the internal components remain dry and functional over time.