Selecting Premium Materials: Solidifying The Foundation Of Solar Carport Performance

As a composite facility integrating photovoltaic power generation and parking functions, the long-term reliability and overall benefits of a solar carport largely depend on the scientific selection of its main materials. Materials not only determine the structure's load-bearing capacity and durability but also affect the photovoltaic system's power generation efficiency, safety performance, and maintenance costs. The industry has developed a material selection system oriented towards high performance, environmental resistance, and lightweight design, encompassing the main structure, photovoltaic modules, and supporting components.

The main structure bears the load and provides protection for the carport. Commonly used materials include high-strength steel, aluminum alloys, and fiber-reinforced composite materials. High-strength steel possesses excellent yield strength and toughness, making it suitable for large-span, heavy-load applications. After hot-dip galvanizing or epoxy coating, it effectively resists atmospheric corrosion and acid rain erosion. Aluminum alloys are lightweight and corrosion-resistant, facilitating transportation and on-site assembly, making them suitable for urban locations where weight is a concern or where aesthetic harmony is crucial. Fiber-reinforced composite materials combine lightweight, high strength, and designability, enabling customized applications in complex shapes and special environments; however, their fire resistance and UV resistance require formulation optimization to ensure optimal performance.

Photovoltaic modules are the core of energy conversion, and their substrate and encapsulation materials directly affect power generation stability and lifespan. Mainstream photovoltaic glass uses ultra-white, low-iron tempered glass, which boasts high light transmittance and excellent mechanical strength, capable of withstanding significant hail impacts. EVA or POE encapsulation films are responsible for bonding the cells to the cover plate, requiring good light transmittance retention, resistance to damp heat aging, and resistance to potential-induced degradation. Common backsheet materials include fluorinated films and tempered glass; the former is lightweight and moisture-proof, while the latter offers advantages in weather resistance and fire resistance. The solar cells themselves are mainly made of monocrystalline silicon, polycrystalline silicon, and thin-film. Monocrystalline silicon offers high efficiency and good performance in low light, polycrystalline silicon provides excellent cost-effectiveness, and thin-film cells offer good flexibility and are suitable for curved surface installation.

Supporting components include brackets, fasteners, and electrical protective devices. The brackets are often made of the same material as the main structure to ensure electrochemical compatibility and corrosion resistance. Fasteners should be made of stainless steel or hot-dip galvanized steel to prevent loosening caused by electrochemical corrosion. Electrical protective shells are often made of weather-resistant engineering plastics or anodized aluminum, balancing insulation, UV resistance, and heat dissipation requirements.

In the material selection process, a comprehensive evaluation of mechanical properties, environmental resistance, economy, and recyclability is necessary, and a targeted match should be made based on the climate characteristics, load requirements, and operation and maintenance conditions of the project site. Only by achieving a balance between structural safety, high power generation efficiency, and long-term durability can solar carports deliver stable and reliable green value in various application scenarios.