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Classification of photovoltaic glass
Classification of photovoltaic glass
The packaging glass used in solar photovoltaic modules is generally used for the upper surface of photovoltaic modules, and photovoltaic glass is required on both sides of double glass modules. Photovoltaic glass is generally low iron tempered glass or semi tempered glass, which must have a certain mechanical strength. It is generally required to withstand wind pressure above 2400Pa and snow pressure above 5400Pa to protect the internal battery. At the same time, it requires high transmittance and high reflectivity for infrared light greater than 1200nm to improve the efficiency of the module， Glass product .
Composition of photovoltaic modules
low-iron tempered glass
The mainstream products of crystalline silicon photovoltaic modules all use low iron (i.e. ultra white) tempered and rolled glass. Due to its low iron content and few bubbles, the transmittance can generally exceed 93.8%, and it has a high reflectivity for infrared light greater than 1200nm, which can improve the efficiency of the module. In addition, the thickness requirement is 3.2mm. It can enhance the impact resistance of components and serve as a seal for the components.
Most manufacturers coat the surface of tempered glass with an antireflective film, with the aim of increasing the power generation of components by increasing the transmittance of visible light while maintaining a fixed conversion efficiency. The principle of glass antireflective film is to form a porous silicon oxide film on the surface of the glass, and adjust the effective refractive index of the film to around 1.22 by using the volume ratio of the gaps, thereby achieving the goal of wide spectrum and large angle antireflection. The antireflective film can increase the efficiency of photovoltaic modules by about 2.5%. At the same time, the anti reflective film also plays a certain self-cleaning role.
With major component manufacturers launching dual glass photovoltaic module products, dual glass modules are increasingly receiving attention from industry insiders. The glass used on the front of double glass products is generally low iron tempered rolled glass, and some products also use low iron tempered float glass in pursuit of higher light transmittance.
Classification of photovoltaic glass
Photovoltaic glass can be roughly divided into three categories: ultra white embossed glass, ultra white processed float glass, and transparent conductive oxide coated (TCO) glass.
Crystal silicon photovoltaic modules use ultra white embossed glass or ultra white processed float glass. Due to the low iron content of these two types of glass, the transmittance of crystal silicon photovoltaic cells is higher than that of ordinary glass, especially embossed glass, which can reach a transmittance of over 91.5%, thereby improving the power generation efficiency of the entire photovoltaic module and protecting solar cells.
Thin film photovoltaic modules generally use TCO glass as the packaging board. TCO glass is composed of ultra white processed float glass with TCO coating (as the front electrode for the power generated by TCO batteries). Through coating technology, the transmittance of ordinary solar ultra white glass can be increased by more than 2.5%, and the transmittance of 3.2mm thick ultra white glass can reach more than 94%.
The current trend of component development has shifted from single glass to double glass, where one side of the component used glass and the other side used a backboard. In the future, both sides will use glass. The reason is that the advantages of glass, such as corrosion resistance, wear resistance, non degradability, and flame retardancy, are much superior to those of the back panel, and the safety of photovoltaic modules after installation is improved.
In the early days, due to the use of standard thickness glass in double glass components, the weight was too large and transportation and installation difficulties were too high, which did not result in large-scale promotion. In the future, as the technology of ultra-thin glass matures and prices decrease, the penetration rate of double glass components will continue to increase.
The packaging glass used in solar photovoltaic modules is generally used for the upper surface of photovoltaic modules, and photovoltaic glass is required on both sides of double glass modules. Photovoltaic glass is generally low iron tempered glass or semi tempered glass, which must have a certain mechanical strength. It is generally required to withstand wind pressure above 2400Pa and snow pressure above 5400Pa to protect the internal battery. At the same time, it requires high transmittance and high reflectivity for infrared light greater than 1200nm to improve the efficiency of the module， Glass product .
Composition of photovoltaic modules
low-iron tempered glass
The mainstream products of crystalline silicon photovoltaic modules all use low iron (i.e. ultra white) tempered and rolled glass. Due to its low iron content and few bubbles, the transmittance can generally exceed 93.8%, and it has a high reflectivity for infrared light greater than 1200nm, which can improve the efficiency of the module. In addition, the thickness requirement is 3.2mm. It can enhance the impact resistance of components and serve as a seal for the components.
Most manufacturers coat the surface of tempered glass with an antireflective film, with the aim of increasing the power generation of components by increasing the transmittance of visible light while maintaining a fixed conversion efficiency. The principle of glass antireflective film is to form a porous silicon oxide film on the surface of the glass, and adjust the effective refractive index of the film to around 1.22 by using the volume ratio of the gaps, thereby achieving the goal of wide spectrum and large angle antireflection. The antireflective film can increase the efficiency of photovoltaic modules by about 2.5%. At the same time, the anti reflective film also plays a certain self-cleaning role.
With major component manufacturers launching dual glass photovoltaic module products, dual glass modules are increasingly receiving attention from industry insiders. The glass used on the front of double glass products is generally low iron tempered rolled glass, and some products also use low iron tempered float glass in pursuit of higher light transmittance.
Classification of photovoltaic glass
Photovoltaic glass can be roughly divided into three categories: ultra white embossed glass, ultra white processed float glass, and transparent conductive oxide coated (TCO) glass.
Crystal silicon photovoltaic modules use ultra white embossed glass or ultra white processed float glass. Due to the low iron content of these two types of glass, the transmittance of crystal silicon photovoltaic cells is higher than that of ordinary glass, especially embossed glass, which can reach a transmittance of over 91.5%, thereby improving the power generation efficiency of the entire photovoltaic module and protecting solar cells.
Thin film photovoltaic modules generally use TCO glass as the packaging board. TCO glass is composed of ultra white processed float glass with TCO coating (as the front electrode for the power generated by TCO batteries). Through coating technology, the transmittance of ordinary solar ultra white glass can be increased by more than 2.5%, and the transmittance of 3.2mm thick ultra white glass can reach more than 94%.
The current trend of component development has shifted from single glass to double glass, where one side of the component used glass and the other side used a backboard. In the future, both sides will use glass. The reason is that the advantages of glass, such as corrosion resistance, wear resistance, non degradability, and flame retardancy, are much superior to those of the back panel, and the safety of photovoltaic modules after installation is improved.
In the early days, due to the use of standard thickness glass in double glass components, the weight was too large and transportation and installation difficulties were too high, which did not result in large-scale promotion. In the future, as the technology of ultra-thin glass matures and prices decrease, the penetration rate of double glass components will continue to increase.
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