What are the common quality issues with PV modules steel l section?
1. Unreasonable lamination or secondary lamination. The lamination temperature is too high, or the lamination time is too long, and the component is repaired and re-laminated. After the high temperature of the PV module, the EVA yellowing aging coefficient increases, and the outdoor use for a long time will occur in the auxiliary materials such as EVA and back sheet. The yellowing eventually leads to a significant drop in the power generation of the module.
2. There are defects or pollution inside the battery when it is selected. The defect of the battery will be exposed in the long time of use, and the power of the component is greatly reduced. The selection of cell manufacturers is crucial, and component manufacturers should also be equipped with relevant testing instruments, such as EL sorters, EL testers, etc., to reduce the problem of cell flow into the production process.
3. Cracked battery pieces. There is a hidden cell in the module, and its power is slightly lower than that of the normal specification. In the long-term use process, the hidden cracks are intensified, causing more area to be reduced from the component circuit and causing hot spot effect. Photovoltaic components are hot spots and even burned.
4. The component is exposed to silica gel, and the EVA residue is not cleaned in place, causing the adhesion of outdoor dust, which may cause hot spots to damage the components; there are obvious bubbles in the bubble assembly, and the bubble area increases or even creates continuity after long-term use. The bubble channel will cause the component power to drop and eventually cause the component to be unusable.
5. The flux is not used properly. The abuse of flux. There is more flux residue on the surface of the battery. It is not treated before packaging. Corrosion after encapsulation is easy to cause greening of the solder ribbon, increase component resistance and reduce component power. In addition, when the residual flux has a small PH value, it may react with the EVA to cause yellowing, resulting in a decrease in the power of the module. When the battery is soldered, the flux is improperly used, causing the EVA to react with the flux, forming a large amount of white spots on the surface of the battery, and the power of the module is greatly reduced.
6. Virtual welding. The welding area of the circuit inside the component is too small. Under the harsh climatic conditions, the connection failure occurs due to the influence of high and low temperature alternating, which ultimately causes a large drop in the power of the module; the battery is binned. The power and current binning of the battery in the component are inconsistent, and the actual output power of the component is too different from the theoretical power of the component. Inconsistent binning will cause abnormalities in the electrical performance test curve of the component, causing a hot plate effect, which will greatly reduce the component power for a long time.