Quick Answer
Hail-resistant solar panels use materials such as tempered glass, polycarbonate, and acrylic to withstand hail impacts. These materials are designed to absorb or distribute the force of hailstones, reducing the risk of damage to the solar panel's electrical components.
Materials Used in Hail-Resistant Solar Panels
Tempered glass is a popular choice for hail-resistant solar panels due to its high impact resistance and durability. It is made by heat-treating regular glass to increase its strength and resistance to thermal stress. Tempered glass can withstand hailstones of up to 1 inch (2.5 cm) in diameter and 100 mph (160 km/h) winds.
Polycarbonate and acrylic are also used in hail-resistant solar panels, particularly in high-hail-risk areas. These materials are lightweight, flexible, and impact-resistant, making them ideal for solar panels that need to withstand strong winds and hail. Polycarbonate, for example, can withstand hailstones of up to 1.5 inches (3.8 cm) in diameter, while acrylic can withstand hailstones of up to 2 inches (5 cm) in diameter.
Testing and Certification
To ensure that solar panels meet hail-resistance standards, manufacturers must undergo rigorous testing and certification processes. In the United States, for example, solar panels must meet the requirements of the UL 1703 (Underwriters Laboratories) standard, which tests the panel’s ability to withstand hail impacts, wind loads, and other environmental stresses. Manufacturers must also comply with international standards such as IEC 61730 and IEC 61701, which cover hail resistance and other environmental stresses.
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