Energetica India Magazine -October 2020

In addition, the power losses under different partial shading conditions are carried out, the shading area is use 166 half-cell as the baseline (137.08 cm2). By taking the Vertex 550W module as an example, due to the advantage of G12 large-size silicon wafers and innovative layout design in the PV module, the power loss under shading is smaller. When partial shading occurs, the Vertex 550W series modules demonstrated an outstanding power retention rate. A schematic diagram of the shading condition is shown in Figure 4.: Table 1 The Power losses of the Modules under Different Shading Condition (Based on two-diode Model) Figure 4 Shading Conditions of Modules 2. Take the Initiative to Apply Non-Destructive Cutting Technolo- gy to Ensure the Optimal Mechani- cal Performance of Each Minimum Unit Cell in the Module and Elimi- nate the Risk of Cracking Trina Solar’s 600W/550W series mod- ules took the initiative within the in- dustry to apply non-destructive cut - ting technology. Its essence lies in the term “non-destructive”, which is to say the solar cells are not dam- aged at all during the cutting pro - cess. After cutting, every minimum unit cell in the module is guaranteed to be in optimal performance. In tra - ditional laser cutting, a laser is first used to melt the silicon wafer at a high temperature exceeding 1500°C, and then cut to a certain depth be - fore breaking it. This will inevitably cause micro-cracks on the cutting surface and affect the mechanical strength of the cell. The non-destruc- tive cutting adopts low-temperature laser technology, with the principle of thermal expansion and contraction to separate wafers by thermal stress. The section is to cut with a smooth surface without any micro-cracks. The mechanical strength of the cut cell will be close to that of the whole cell, which minimizes the risks of frag - mentation and cracking during the process of utilization to a maximum extend. Provided with the same in- stallation conditions, to compare the modules undergone cell encapsula - tion, on-destructively cutting process and the modules of conventional la- ser cutting process, the absolute val - ue of power attenuation of the former can be reduced by 1%-1.5% under 5400Pa load conditions, therefore to provide the customer with a reliable value. 30 energetica INDIA- October_2020