Improving output power and efficiency of PV modules have been under heated discussions during recent years in the solar industry sector. Here, we outline the topics which have become trends, especially expected in 2020. These include Multi-Bus bar, Round Ribbons, Large Wafer Size and Half/Third cut.
One of the most simple and accessible ways to reduce resistance losses in solar cells which are embedded in a PV module is to add more busbars. Adding more busbars reduces the gap between them, which also shortens the finger length. Thus, the current load carried by the section of fingers between the busbars lessens with a higher number of busbars.
Round Interconnection Ribbons
Round ribbons or bus bar wirings are responsible for conducting the direct current that the cells collected from solar photons to the solar inverter. Round ribbons first of all lead partially to reduce in the shading losses compared to flat ribbons. In addition to that, they also increase the reflectance of incident lights into the interface of the glass and the front encapsulant layer of a PV module. Therefore, the use of this technique can result in both increasing the output power and also the efficiency of the PV module.
Large Wafer Size
In 2016 some of the producers started to increase the wafers size and expand it to 156mm x 156mm. Now, this has become one of the market trends with the marketing phrase, “Bigger is Better”. The thought behind this choice is reaching higher output power at the module level.
Cutting a solar cell into two or three pieces is another trend of the year. Cutting a solar cell so exactly that it is divided into two same halves has been proven to be an effective way to “lower resistive power loss”. Each of the sliced cells generates half of the current of a full cell. Respectively, due to the direct relationship of electrical losses with the square of the generated electric current in a cell, this results in reducing resistive losses in the interconnection of solar modules. The formula of electrical losses is equal to the square of the electrical current multiplied by the resistance.
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