In addition to Jinko and other well- known manufacturers for photovoltaic products, the Chinese manufacturer Longi Solar also achieves a new efficiency for its Topcon solar cell and also places a new product on the market.
In this article, we will take a closer look at Longi’s innovations.
0.12 percent efficiency improvement for tunnel oxide passivation contact technology (Topcon) solar cell sets new record
Longi announced it has achieved a 0.12 percentage point increase in just one month. At the beginning of May, the efficiency was 25.09 percent. Now, however, it stands at a new record of 25.21 percent. Back in May, the Chinese photovoltaic manufacturer mentioned that a solar cell based on such technology had surpassed the 25 percent mark for the first time. However, the technical background necessary to achieve this goal was not mentioned. Li Hua, head of cell research and development, explained that in order to achieve the respective targets, Longi always tries to stay close to the essence of the technology. The best possible technical path is selected to maximize the performance potential of each product. In addition, necessary changes are always initiated immediately in order to be able to achieve the maximum of its own technical change. This approach currently makes Longi the world’s largest solar manufacturer in terms of market value and sales.
Bifacial n-type Topcon solar module with an efficiency of 22.3percent storms the market
In addition to increasing the efficiency of the tunnel oxide topcon solar cell, Longi introduced a newproduct in June this year. This is a bifacial n type topcon solar module with a calculated efficiency of 22.3 percent overall. This 144-half-cell module is to be available in six versions with outputs between 545 and 570 watts and with an efficiency between 21.3 and 22.3 percent.
Within the following table you can find a summary of the most important data:
| HiKu7 CS7N-MS | |
| Dimension | 2256mm x 1133mm x 35mm |
| Weight | 32,3 kg |
| Efficiency | between 21,3 an 22,3 percent |
| Open circuit voltage | between 50,85 and 51,60 volts |
| Short circuit current | ranges from 13,46 to 13,81 amps |
| Maximum system voltage | 1500 volts |
| Mono-crystalline half cell count | 144 |
| Protection class | IP68 |
| Operating temperatures | Use at between -40 and +85 degrees Celsius |
| Operating temperature coefficient | 0.31 percent per degree Celsius |
| Performance guarantee | 30 years |
| Product warranty | 12 years |
| Power loss | after 30 years not less than 87.40 percent of nominal output powe |
| Other specifications | features two-millimeter thick coated tempered glass and anodized aluminum alloyframe |
Longi has hereby produced a module based on the company’s proprietary high-performance computing technology. The Chinese PV manufacturer promises us here to have produced a module which has,
- a better temperature coefficient,
- better performance at low irradiance,
- a lower operating temperature and
- better performance in light-induced degradation (LID) and potential-induced degradation (PID).
Accordingly, we can assume that the energy yield is two to three percent higher than conventional bifacial n-type modules.
Conclusion
The solar industry is growing steadily, and as we have seen, the world’s largest PV manufacturer, Longi Solar, is also playing a major role in this industry. Along with products from other numerous photovoltaic manufacturers, the new module and also the increased efficiency can definitely keep up. We are curious to see what new innovations and improvements in the field of photovoltaics will come our way in the following months.
References
Emiliano Bellini ? PV-Magazin; Longi stellt bifaziales n-type-Topcon-Solarmodul mit 22,3 Prozent Wirkungsgrad vor; 04.06.2021; Longi stellt bifaziales n-type-Topcon-Solarmodul mit 22,3 Prozent Wirkungsgrad vor ? pv magazine Deutschland (pv-magazine.de)
Emiliano Bellini ? PV-Magazin; Longi erreicht 25,21 Prozent Wirkungsgrad für Topcon-Solarzelle; 02.06.2021; Longi erreicht 25,21 Prozent Wirkungsgrad für Topcon-Solarzelle ? pv magazine Deutschland (pv-magazine.de)
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