Quality Control
Quality Control
Quality is of paramount importance to us. To deliver outstanding quality solar panels while meeting highly customized demands for solar applications is the most import thing to us. From the selection of raw materials, through the process of manufacturing, to packaging and transportation; quality control is strictly implemented.
At China Blue Solar facility, in-process inspection is an overall effort performed at each stage of solar panel manufacturing. We will conduct 100% visual inspection and performance tests of all solar panels before packaging and shipping.
Quality Management of Raw Materials
We not only strictly select raw material suppliers with reliable quality, but also carry out strict inspection on incoming materials.
Tempered Glass:
The role of tempered glass is to protect the solar cells, the selected photovoltaic glass must have high light transmittance (generally more than 91%), and requires ultra-white tempering treatment. The thickness of photovoltaic glass is either 3.2mm or 2.0mm. The most commonly used is the 3.2mm thick glass. If customers want thin and light tempered glass solar panels, we will use glass with a thickness of 2.0mm. Concerning the incoming photovoltaic glass, we check the flatness, dimensional tolerance, thickness, bubbles & impurities etc.. If any of these high standards are not met, then we will reject the glass.
Solar Cell:
Solar cells convert sunlight into electricity via the photovoltaic effect. They are the core parts of solar panels. Generally speaking, the power of a solar panel is proportional to the area of the solar cell. Therefore, we have to choose the solar cells with the highest conversion efficiency. We use IBC solar cells with 23.5% - 24% efficiency, PERC mono solar cells with 22.5%-24% efficiency, and poly solar cells with 20% efficiency. We not only check the efficiency of the solar cells, but also inspect the appearance of the cells to avoid color deviation between different solar cells, and check for cracks.
Backsheet
The function of the backsheet is to seal, insulate and waterproof. Therefore, the selected backsheet materials such as TPT and TPE must be resistant to aging.
The backsheet is available in white and black. The white backsheet is commonly used, but some clients choose to use the black backsheet in order to maintain the color consistency with the application product and to be aesthetically pleasing.
There are fluorine-containing and fluorine-free backsheets. The fluorine-containing backsheet has the characteristics of good adhesion, high density, good bonding and more sealing. The adhesiveness of the fluorine-free backsheet is not good.
Therefore we choose fluorine-containing, anti-UV backsheets, and conduct durability testing.
ETFE Film:
ETFE film is a film used to protect solar cells inside solar panels. Its thickness is usually less than 0.2mm, making it thin and light. In addition, it has the characteristics of resistance to temperature changes, high light transmittance of up to 95%, high self-cleaning, corrosion resistance, and long service life.
EVA:
EVA is an important encapsulant material, which is used to bond tempered glass and solar cells. It is usually cut into a thin sheet that can be inserted at the front and rear of the solar cells. The quality of transparent EVA material directly affects the lifespan of the solar panel. Should EVA be exposed to the air, it will easily age and turn yellow, thus affecting the light transmittance of the solar panel, and power generation quality. If the adhesiveness of EVA is not up to standard, and the bonding strength of EVA to tempered glass and the backsheet is not enough, it will cause EVA to age prematurely and affect the life span of solar panels. Therefore, it is very important to check the adhesiveness of EVA. The thickness of EVA ranges from 3mm to 4.5mm; among them, 4mm and 4.5mm are used the most. We check the adhesiveness, thickness and anti-UV properties etc. for all the EVA used in our panels.
Junction Box:
The junction box is a connecting device between the solar panel and the solar charging control device. Its main function is to connect and protect the solar panel, connect the power generated by the solar cell to the external circuit, and conduct the current generated by the photovoltaic module. We choose junction boxes which have a waterproof rating of IP67 or above.
Wire Harnesses:
We choose wire harnesses that comply with RoHs, UL standards
Quality Control in Production Process
Quality control runs through the entire process of our production. We not only inspect every step of production, but also use professional testing equipment for performance testing.
EL (Electroluminescence) Testing Machine
EL inspection can detect micro cracks and fragments of solar cells that cannot be seen in visual inspection. Cracked solar cells in a solar panel can seriously affect the output power of the solar panel. Therefore, EL testing is done twice to make sure there are no undetected cracked cells, in order to ensure the high output of the solar panel.
Solar Panel Flash Tester
The solar panel flash tester detects the electrical parameters of the solar panel, such as rated power, current, voltage, I-V curve measurements etc.
Quality Control in Packaging and Transportation
After passing visual inspection and performance testing, we clean all solar panel surfaces before packing. According to the size and material of different solar panels, we have different packaging methods, including bubble bags, cartons, cardboard, wooden boxes, etc., to ensure safety during transportation.
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