An interview with farmer Hanspeter Knüsel from Hünenberg.

The barn is located in a protected visual environment. Thanks to meticulous integration of the solar roof into the roof surface, the Swiss historic preservation authorities gave the green light for the renovation.

Solar roof with an area of 600 m2, a capacity of 90 kWp and an annual output of about 90,000 kWh.

SUNSTYLE AG: Mr Knüsel, how did you come to learn about our solar roof?
MR KNÜSEL: At a trade fair. I knew right away that this was the roof for me. I always look at things with a practical eye. With this roof, I was persuaded by how the solar tiles overlap, that it doesn’t require an aluminium construction and that it consists of 6 mm safety glass. So I thought to myself, if a craftsman can stand on it, then it can also withstand the weather. It was also clear to me from the outset that only a roof-integrated installation would do for the barn.

SUNSTYLE AG: Does it produce as much energy as was projected?
MR KNÜSEL: The projected mean values have been exceeded.

SUNSTYLE AG: Would you renovate your roof today with SUNSTYLE®?
MR KNÜSEL: Yes, I have only praise for the beautiful roof. I often talk with pedestrians or bikers about it because they aren’t sure if it’s actually a solar roof as it fits so well into the surroundings. And of course the costs and benefits have to be in balance.

SUNSTYLE AG: Thank you for the interview and the good collaboration.

the world’s largest building-integrated solar power plant  Saint Charles Solair Perpignan (France)


«The continuous development of solar energy supply is what drives us.»
The large-scale launch of the SUNSTYLE® solar roof took place as part of the Saint Charles Solair power plant project in Perpignan (France). The existing solar systems were not attractive from either a design or technical perspective. To ensure the technical and economic feasibility of the Saint Charles Solair project in Perpignan, SOLAIRE SUISSE developed the SUNSTYLE® solar roof as a reliable and easy-to-use roof system. As a fully integrated solution, SUNSTYLE® replaced the existing roof membrane, thus ensuring lasting weather protection. The SUNSTYLE® solar roof was so persuasive that the entire 68,000 m² of warehouse roof surfaces in Perpignan were renovated. With an output of nine megawatts, the world’s largest building-integrated solar power plant gives an impressive demonstration of the potential of energy-producing building materials.

The continuous development of the solar roof and the integration of technical innovations has made available a patented solar roof that sets new standards.

Manufacture and quality

The SUNSTYLE® solar tile was developed as an energy-efficient, long-lasting construction element. The crystalline solar cells integrated into the tile are embedded in a flexible, stabilising layer of ethylene vinyl acetate (EVA). They are protected on the front by hardened solar glass, and on the back by either a layer of resistant plastic (Tedlar) or hardened safety glass (ESG). All these factors combined with many years of expertise make SUNSTYLE® an extremely long-lasting construction element.

The coloured solar tiles are pigmented on the inside of the front glass using a specially developed technology. Thanks to the use of UV-stable pigments, this enables long-lasting, colour-fast modules to be manufactured. The internal pigment layer also ensures that the self-cleaning function of the glass surface is maintained. The solar tiles are produced in both glass-film and glass-glass designs and are based on proven standard components.

Quality and Certification IEC 61215, IEC 61730 (protection class II)
External product validation CSTB (Centre Scientique et Technique du Bâtiment)
Snow load testing (SUPSI) Snow load: >15,4 kN/m2 at slope 0 – 30°
Coloured glas-glas tiles IEC 61215, IEC 61730, UL 1703, IEC 61701, IEC 62716


«With its fish-scale pattern, the SUNSTYLE® solar roof is reminiscent of the centuries-old slate roof.»
With its fish-scale pattern, the SUNSTYLE® solar roof is reminiscent of the centuries-old slate roof.
Our aim is to ensure that appearance of the roofscape is maintained. The traditional slate and shingle roofs in the Alpine region inspired the design of the diamond-shaped pattern. This installation principle guarantees optimal water-tightness and stability of the roof. The installation pattern and the seamless adaptation to the individual roof shape create a harmonious structure. In addition, the new solar tiles in brick red and slate grey are an excellent match for roofs clad with brown-red clay tiles and grey fibre cement tiles. The SUNSTYLE® solar roof has an extremely low construction height and can be integrated stylishly into any building.


Expectations of the energy performance of buildings will continue to increase. At the same time, we want to move away from fossil fuels and nuclear energy, and towards renewable energy sources. A fully integrated solar roof that converts clean and unlimited solar energy into electrical energy stays takes this trend into account. The SUNSTYLE® solar roof connects the two objectives in a harmonious manner: first, as a high quality construction element, it offers sustainable weather protection; and, second, it enables efficient electricity production over the entire roof surface.
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