Is a 500W solar module in sight?

LONGi Solar this week said that it has invented a new “seamless soldering” technique that could help it produce a more efficient solar module. As a reminder, the more solar cells you can pack into a module, the more efficient it is. And the more efficient your modules, the fewer you need to achieve the wattage you seek in an array. By using less modules, you reduce the overall installed cost of solar. 

LONGi said its “seamless soldering” completely eliminates the gap between cells and could increase the efficiency of PV modules. According to a test conducted by TÜV SÜD this week, the technology, when combined with innovative module design, has the potential to push LONGi Solar’s high efficiency PERC module power record to 500Wp, said LONGi Solar in a press release. The technology is planned for mass production in 2H-2019.

“Seamless soldering” technology uses a solder ribbon to achieve “tiled” interconnection of the cell, eliminating the typical 2mm wide cell gap, thus increasing efficiency while reducing the BOM cost of the module, according to the company. LONGi said the technology is compatible with existing module encapsulation processes and equipment and is easily scalable. 

LONGi said it has applied for a number of patents related to the new technology. 

Related: SunPower releases most efficient residential solar panel on the market

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Jennifer Runyon has been studying and reporting about the world's transition to clean energy since 2007. As editor of the world's largest renewable energy publication, Renewable Energy World, she observed, interviewed experts about, and reported on major clean energy milestones including Germany's explosive growth of solar PV, the formation and development of the U.S. onshore wind industry, the U.K. offshore wind boom, China's solar manufacturing dominance, the rise of energy storage, the changing landscape for utilities and grid operators and much, much, more. Today, in addition to managing content on Renewable Energy World and POWERGRID International, she also serves as the conference advisory committee chair for DISTRIBUTECH, a globally recognized conference for the transmission and distribution industry. You can reach her at

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