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What is the glass used in the production of photovoltaic modules?
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What is the glass used in the production of photovoltaic modules?

Views: 0     Author: Site Editor     Publish Time: 2021-07-07      Origin: Site


We know that photovoltaic modules play a great role in our production and life. There are main materials for the production of photovoltaic modules. One of the materials for the production of photovoltaic modules is glass. So what is the glass used in the production of photovoltaic modules? Let's take a look together next.

Here is the content list:

  • Low iron embossed tempered glass

  • Experiment

Low iron embossed tempered glass

At present, the glass used in the production of crystalline silicon solar photovoltaic modules is usually produced by the calendering method. The typical thickness is 3.2mm±0.3mm, which is converted to a 3mm standard thickness of sunlight in the wavelength range of the photovoltaic module's spectral response (350~1100nm). The transmittance should be greater than 91%, and the infrared light greater than 1200nm has higher reflectivity. Reducing the iron content of the glass can effectively increase the transmittance of the glass. The iron content (Fe203) of the photovoltaic module glass should not be higher than 0.015%. In the glass production process, the two sides are made into suede of different sizes to increase the amount of sunlight. The purpose of tempering is to increase the strength of the glass and protect the photovoltaic modules for a long time.

Tempered glass for photovoltaic modules used as encapsulating materials for crystalline silicon solar photovoltaic modules usually requires good mechanical impact resistance, small bending, and no scratches in appearance. The bow curvature of the photovoltaic module glass should not exceed 0.2%. Any 300mm range of wave curvature should not exceed 0.3mm.

To prevent the tempered glass from chipping before and after packaging, it is usually required that the length of the tempered glass of the photovoltaic module should not exceed 10mm per meter, the depth from the edge of the glass to the surface of the glass plate should not exceed 2mm, and the extension from the plate to the glass should not exceed the glass Burst edges with a thickness of one-third. No concentrated bubbles with a length less than 1mm are allowed inside the tempered glass of the photovoltaic module. For bubbles with a length greater than 1mm but not greater than 6mm, no more than 6 bubbles per square meter, no stones, cracks, or missing corners are allowed. The number of fragments must exceed 40 in an area of 50mm×50mm, and a small amount is allowed. Long strips, the length of which does not exceed 100mm. Unqualified tempering can easily cause photovoltaic modules to break during use.

To reduce the optical reflection of the glass of the crystalline silicon solar photovoltaic module and increase the power output of the module, more and more coated glass is now used. The original film of the photovoltaic module-coated glass adopts 3.2mm ultra-white tempered glass, and special nano-coating is used as the main raw material to obtain photovoltaic coated glass after high-temperature treatment. The light transmittance of the coated glass of photovoltaic modules is required to increase by more than 2% on the original basis. The optical film of the coated glass of photovoltaic modules has good adhesion to the glass substrate, good weather resistance and corrosion resistance, good self-cleaning performance, and long service life.

Experiment

When selecting coated photovoltaic module glass, the following experiments should be carried out: Water-resistance test: After immersing in water for 96h, the coating layer of the photovoltaic module has no obvious change, and the light transmittance change value before and after the test should not exceed 0.5%. Acid resistance test: After immersing in 5% H2S04 solution for 48 hours, the coating layer of the photovoltaic module has no obvious change, and the light transmittance change value before and after the test should not exceed 0.5%. Alkali resistance test: immersed in saturated Ca(OHV) solution for 48h, the coating layer of the photovoltaic module has no obvious change, and the light transmittance change value before and after the test should not exceed 0.5%.

In addition, it is necessary to carry out the salt spray resistance test of photovoltaic modules, the artificial weathering resistance test of photovoltaic modules, the temperature change resistance test of photovoltaic module coatings, the stain resistance test of photovoltaic modules, etc., to ensure that photovoltaic modules using coated glass can reach more than 25 years. Service life.

To produce better photovoltaic modules, the manufacturer of Anhui JF Solar Technology Co., Ltd. (JF Solar) requires high quality in the material glass of photovoltaic modules. If you are interested in photovoltaic modules, please contact us. Our website is https://www.jf-solartech.com/.


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