What is photovoltaic module backsheet glass, and what role does it play in solar panels?

Definition and Function of Photovoltaic Module Backsheet Glass

Photovoltaic module backsheet glass, as the name suggests, is the glass material used on the back of solar panels. It replaces traditional polymer backsheets (such as TPE/TPU) and serves as the solid "backing" of photovoltaic modules. Its core function is to protect the solar cells and circuitry within from environmental damage while providing structural support for the entire photovoltaic module.

From a technical perspective, the production process of photovoltaic module backsheet glass is crucial. It can be processed using either tempered or semi-tempered technology, and its excellent mechanical strength and impact resistance mean that the backsheet glass can effectively protect the sensitive internal components of the module from severe weather such as wind, snow, and hail, as well as accidental impacts during transportation and installation.

Diverse Options and Performance

To meet the needs of different application scenarios, photovoltaic module backsheet glass offers a variety of options. Two common thicknesses are available: 2.5mm and 2.0mm, each offering a balance between weight and strength. Manufacturers offer either enameled or unenameled finishes. Enameled photovoltaic module backsheet glass boasts a reflectivity of at least 75% within a specific wavelength range (380-1100nm), contributing to overall module efficiency. Additionally, a wide range of surface treatments are available, including patterned/smooth glass and float glass, which not only enhance the appearance but also contribute to the glass's durability.

Why is photovoltaic backsheet glass becoming increasingly important?

As the photovoltaic industry evolves towards higher efficiency and reliability, higher demands are placed on the long-term stability of photovoltaic modules. Compared to traditional backsheet materials, glass backsheets offer superior weather resistance, water resistance, and abrasion resistance, effectively preventing moisture penetration and external wear, significantly extending the lifespan of solar panels. This superior durability makes photovoltaic module backsheet glass the preferred material for double-glass modules (modules with glass on both the front and back), providing a reliable guarantee for the long-term stable operation of photovoltaic power generation systems.

Photovoltaic module backsheet glass is more than just a piece of glass; it is a key guardian of the performance, safety, and lifespan of photovoltaic modules. Its technological advancement and widespread application are driving the continued development of the entire solar industry.