An interview with building owner Peter Rohrer in picturesque Melchtal.
The roof of the new detached house in Melchtal in the canton of Obwalden withstands the weather conditions.
Solar roof with an area of 170 m2, a capacity of 23 kWp and an annual output of about 21,000 kilowatt hours.
SUNSTYLE AG: Mr Rohrer, which key criteria persuaded you to go with the SUNSTYLE® solar roof?
Mr Rohrer: I immediately noticed the shape of the solar tiles on the internet. The criteria for me were the aesthetics and the water-tightness at a low pitch. In terms of appearance, the solar roof should not be too different from conventional roofs – it’s the first photovoltaic installation in our mountain village and it should not stand out in a negative way. I wanted the largest possible roof area and that meant using a pitched roof. Due to the angle of incidence of the sun’s rays, it had to be quite flat, so water-tightness at a low pitch was a criterion.
SUNSTYLE AG: Was the solid and accessible construction also a criterion?
Mr Rohrer: Yes, the photovoltaic installation is a part of our house’s building envelope, so it should last a long time. We are 1,000 metres above sea level and our house is very exposed when it comes to the weather. The shallow pitched roof is put under a heavy strain from snow in winter, strong winds and hail. We experienced a violent storm over Christmas 2014, which swept across Switzerland – our solar roof weathered the storm easily.
SUNSTYLE AG: How have people around you reacted to the solar roof?
Mr Rohrer: They were interested in terms of the roof’s appearance and form. It appears more dynamic than a roof made from conventional materials. But they were sceptical when it comes to the cost-benefit ratio. A solar roof is simply a building envelope and electricity producer in one; therefore it’s a long-term attractive investment and not just a money-making machine. It also contributes to sustainable energy production.
SUNSTYLE AG: Has your property increased in value with the solar roof?
Mr Rohrer: Yes, particularly as we chose a long-lasting and integrated installation. But merely talking about such products doesn’t help future generations: they should be integrated into today’s standards.
SUNSTYLE AG: Thank you for the interview. We wish you and your family many hours of sunshine and happiness under your solar roof.
«The continuous development of solar energy supply is what drives us.»
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.»