The design lifetime of photovoltaic modules is approximately 20 to 30 years. The thermal performance test in reliability is a design verification of photovoltaic modules used in the simulation of the ground, allowing the module to operate for more than 20 years under normal climate conditions. The specification requires that the module be heated. Cycling test, wet freezing test, and damp heat test to confirm that the component can withstand the negative temperature effect after high temperature and high humidity, as well as fatigue and thermal failure caused by repeated changes in temperature, and to determine that the PV module is exposed to high humidity. The thermal stress and ability to resist the long-term penetration of moisture. 1. The sensitivity of different materials of photovoltaic components to light is different. For durable materials such as most paints and plastics, the short wavelength band of ultraviolet light is responsible for the aging of most polymers. However, for materials that are not so durable, such as some pigments and dyes, the long wavelength and even visible light of UV light can also cause serious aging. 2. When the temperature of the aging chamber of photovoltaic modules rises, the damage of light will increase. Although temperature does not affect the main photoreactions, it does affect secondary chemical reactions. Laboratory burn-in tests must provide precise temperature control, and the process of aging is usually accelerated by increasing the temperature. 3. Dew, rain, and high humidity in the aging box of PV modules are the main causes of moisture damage. Studies have shown that items placed outdoors are on a daily basis for a long period of time (an average of 8-12 hours per day in wet conditions. Studies have found that dew formed by moisture is a major factor in outdoor dampness. Dew is more harmful than rain because it is attached. The longer the material, the more serious the absorption of moisture, of course, the rain is also a great hazard to the material, rain will cause thermal shocks.For example, a car in a hot summer day, the temperature of the car suddenly due to showers Rapid cooling will cause shocks, and mechanical erosion caused by rain erosion will also accelerate the aging of materials, such as the coating of wood removed by the rain to remove the surface aging layer, exposing the unaged inner layer to sunlight, and further Ageing. Bottle Washing Machine,Bottle Cleaning Machine,Bottle Washers,Glass Bottle Washer Jiangsu Hanmo Tecchnology Ltd,.Co , https://www.hanmotecho.com