By 2025, back-contact solar panels from Aiko Solar and Longi would account for more than 50% of the Swiss market, driven by strong demand for high-efficiency rooftop PV systems, according to a new report from Eturnity and the Bern University of Applied Sciences.
The market shares of back-contact (BC) solar panel manufacturers in Switzerland have increased significantly between 2023 and 2025, according to a new report from the Bern University of Applied Sciences and Swiss software company Eturnity.
The Photovoltaic barometer 2026 A report shows that Chinese solar panel manufacturers were in B.C. last year Aiko Solar And Long achieved a combined market share of over 50%, while Aiko held a slightly larger share. Close followers included pure TOPCon manufacturers such as JinkoSolar, Trina Solarand based in Switzerland Megasol.
By 2024, Long And Aiko Solar had market shares comparable to that of Trina Solar And JinkoSolarand together these manufacturers accounted for almost 70% of the Swiss market. In 2023, Aiko was not yet on the Swiss market, while Longi still supplied TOPCon products.
“The Swiss market is almost entirely a rooftop market,” said one of the report’s authors, Christof Bucher pv magazine. “As the cost of PV modules today sometimes represents less than 10% of the project cost, module efficiency becomes a very important aspect when choosing module technology. As the influence of module price on the levelized energy cost (LCOE) decreases, the influence of efficiency increases.”
According to Bucher, Switzerland is not necessarily showing an increasing preference for BC technologies as such, but rather for high-efficiency modules. This distinction may seem subtle, as high efficiency currently coincides in practice with back-contact technology, but the broader trend reflects a focus on maximizing performance rather than simply adopting a specific module type, he continued.
AC/DC ratio
The report also shows that the rated power ratio of PV systems in Switzerland has fallen from 95% in 2017 to approximately 90% in 2023. This reduction reduces the impact of peak power on the electricity grid, making new PV systems increasingly network-friendly.
“We were somewhat surprised that the AC/DC ratio has declined only slightly in recent years. However, inverters are relatively cheap, so the direct savings from maintaining a lower AC/DC ratio may not be immediately apparent. This could change as restrictions on access to the grid increase,” Bucher said.
He also noted that as east-west orientations become more common and north-facing roofs become more attractive, lower AC/DC ratios become more relevant. “If I had to guess, it is the less attractive (or less south-facing) roofs, which have become more viable due to low module prices, that are driving the decline in the AC/DC ratio in the first place,” he added.
The report further highlights that the DC power per MPPT is on average between 5 and 7 kW and has increased slightly over the years. Systems with two MPPTs have clearly become the standard, while models with three or four MPPTs are increasingly used in more complex installations.
Huawei has significantly increased its inverter market share in Switzerland to around 50%, while other suppliers such as Kostal have steadily lost market share, with some manufacturers making only short-term gains.
Another clear trend is the increasing integration of battery storage. According to Solar energy statistics 2024 Through Swissthe number of installed storage systems increased from 45,000 in 2023 to 65,000 in 2024. This means that one in three newly installed PV systems is already equipped with a storage system.
Data from Eternity show that since 2021, the share of PV systems offered with storage has almost doubled. By 2025, more than 70% of PV systems were offered with a storage option. However, a significant portion of end customers still opt for PV systems without additional storage.
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