Dual-glass photovoltaic (PV) modules offer distinct advantages in power generation. The light-transmitting properties and excellent UV resistance of glass make it ideally suited for the characteristics of bifacial solar cells. Within the industry, glass backsheets are widely considered superior to conventional backsheet materials. In 2018, Joshua S. Stein of Sandia National Laboratories and Dirk C. Jordan of the National Renewable Energy Laboratory (NREL) published the first comprehensive review of dual-glass PV modules, providing an in-depth analysis of the technology.

Traditional solar panels typically consist of a stack comprising PV glass, an EVA encapsulant layer, solar cells, a second EVA layer (often white), and a PV backsheet. In contrast, dual-glass modules replace the traditional backsheet with a second layer of glass, resulting in a structure composed of front and rear glass panes sandwiching the solar cells. This design significantly boosts power generation performance, mitigates the risk of localized micro-cracking, and extends the module's service life.

Aesthetically Pleasing, Light-Transmitting Design

The innovative structure of dual-glass solar modules offers outstanding advantages in various applications. Their transparency makes them uniquely suitable for integrated projects such as agrivoltaics (combining agriculture and solar), aquavoltaics (fisheries and solar), and forestry-solar integration. In the field of PV glass greenhouses, these modules not only generate electricity but also meet the light requirements for crops, while simultaneously enhancing the structure's visual appeal.

Resistance to Physical Deformation and Chemical Reactions

Dual-glass modules feature a symmetrical structure with glass on both sides, offering greater mechanical strength than modules with traditional backsheets. The absence of a conventional backsheet reduces the risk of localized micro-cracking during installation and minimizes solar cell deformation, thereby lowering the likelihood of micro-cracks forming under heavy snow loads. Furthermore, the use of glass as a primary component provides excellent resistance to chemical reactions, significantly enhancing the overall structure's corrosion resistance.

Enhanced and Stable Power Generation Efficiency

Dual-glass modules exhibit superior heat dissipation during operation, which helps improve power generation efficiency. Their reliable cell efficiency, resistance to Potential Induced Degradation (PID), enhanced low-light response, and ability to withstand harsh outdoor environments enable higher power output across a wide range of lighting conditions. Extensive comparative test data from industry players demonstrate that, following rigorous testing—including thermal cycling (TC), damp heat (DH), humidity-freeze (HF), and mechanical load tests—double-glass PV modules exhibit significantly lower degradation rates compared to single-glass modules utilizing polymer backsheets. Their resistance to damp-heat aging is particularly outstanding; while single-glass modules often struggle to pass the DH3000 test, double-glass modules easily clear this hurdle thanks to the superior water-vapor barrier properties of glass. Driven by this exceptional performance in stringent reliability tests, manufacturers have extended the power output warranty for double-glass modules to 30 years and committed to lower annual degradation rates.

Wide Range of Applications

Double-glass modules are an ideal choice for a wide variety of applications, thanks to their exceptional weatherability and durability. They are suitable for PV power plants operating in diverse environmental conditions, including coastal and waterside locations, high-humidity regions, areas prone to acid rain and salt spray, and regions subject to strong winds and sandstorms—such as the Xinjiang Uygur Autonomous Region and areas surrounding the Sahara Desert in Africa.

In summary, double-glass solar modules are leading the industry trend through their unique construction and superior performance. By replacing traditional backsheets with glass, these modules deliver outstanding results across various operating environments, offering a more reliable solution for the advancement of clean energy. Choosing CSG PV's double-glass modules combines multiple advantages to create a high-performance solar energy solution.