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Best partner of Half-Cut module: White EVA improving efficiency

News

Best partner of Half-Cut module: White EVA improving efficiency

Classification:
Company news
Release time:
2019/12/04

SUNRISE always seeks advanced technologies to improve the conversion efficiency of module.

LCOE has been the subject of photovoltaic industry that cannot be ignored, sothat the technology as the core of the cost-saving and efficiency-improving is constantly moving forward. More and more types of technologies are applied in photovoltaic module manufacturing to improve the efficiency of power generation. Among them, half-cut technology has gradually appeared in the market due to its advantages such as low internal loss, high efficiency and high cost-effective, and has become the standard configuration of high-efficiency modules.

Table 1

In 15th China SoG Silicon and PV Power Conference, Deng Honghong from Shanghai Haiyouwei New Materials Co., Ltd. said: in their research, it was found that when the modules which combine the half-cut and MBB technology used a high reflectance pre-crosslinked white EVA film as back side film in packaging process, the module power could get a large increase.

Half-cut cell technology is that a laser is used to cut standard full-size cell into two half-cut cells of the same size in a direction perpendicular to the busbar of the cell. By reducing power loss and improving packaging efficiency, the increase of power is 5-10W.

Deng Honghong said that compared with other technologies, half-cut technology has a very significant advantage: it has a good compatibility with other packaging technologies. With MBB technology and a high reflectance pre-crosslinked white EVA film as the bottom film of the module, the half-cell module can achieve a significant power increase.

Figure 1 Analysis of improvement of module power with a high reflectance white EVA film

In a comparison, a type of half-cut-MBB-PERC module was tested. Some were the module with a high reflectance pre-crosslinked white EVA film. The other were the module with a normal EVA transparent film as a back film. The test data are shown in the table below.

Table 2

From the table, it can be found that there is a clear gap between the two modules with different EVAs in power generation benefits. It was roughly estimated that the PERC144 half-cut modules increased about 6 watts than the 72 full-size-cell modules due to that half-cut cells improved the module power by reducing the internal loss of the cell. The MBB (9BB as an example) module increases the current collection capacity and reduces the occupation of the busbar on the cell surface, and it increased the module power by 3-5 watts.

According to the market analysis of international organization ITRPV, in the next few years, half-cut modules will expand from about 5% in 2018 to about 40% in 2028.

Figure2 Predicted share ratio of standard modules,half-cut modules and quarter-cut modules 

In response to the above predictions, at the beginning of this year, Canadian Solar announced that it would fully use half-chip modules in 2019; half-cut modules of Jinko and Trina reached 10-15% in 2018; Sunrise also has achieved mass production of half-cut modules since the beginning of 2019.

Table 3 Companies manufacturing Half-Cut modules and Power (Partial)

Figure3

In response to the above predictions, at the beginning of this year, Canadian Solar announced that it would fully use half-chip modules in 2019; half-cut modules of Jinko and Trina reached 10-15% in 2018; Sunrise also has achieved mass production of half-cut modules since the beginning of 2019.