Residential Rooftops Frenkendorf

Site Overview
Location Frenkendorf, Switzerland
Coordinates 47.50° N, 7.71° E
Average global irradiance 1,080 kWh/m2/yr
Average temperature 9.0 °C, 48.2 °F
Average precipitation 795 mm/yr, 31.3 in/yr
Technical Overview
Date onstream September 2012
System capacity 137 kWp
Panel type SF145-L (145 W)
Number of installed panels 946
Tilt angle, orientation 5°, 175° N
Expected output 126,000 kWh/yr
Total CO2reduction 82,000 kg/yr, 180,777 lbs/yr
Inverter Kostal Piko Series
Financing Bank
Private Investment

The Solvatec AG, based in Basel, Switzerland was founded in 1998 and is a leading company for consulting, planning, marketing and implementation of photovoltaic systems. The experienced team of PV specialists pays special attention to the aesthetic and functional integration of solar installations into overall building structure.

After only four months of construction, several residential rooftop installations were installed and connected to the grid in the Swiss town of Frenkendorf in September, 2012. The total installation of 946 Solar Frontier thin-film modules was installed on flat-pitch rooftops with a tilt angle of only five degrees and a northern orientation. Due to legal requirements and the central location of the buildings, this project had to be realized almost without tilting the modules. Despite these challenging conditions, the 35 homeowners involved in this project expect an annual output of about 126,000 kWh, avoids associated CO2 emissions of 82 tons.

The technical challenges of this project were the flat rooftop tilt angle with only five degrees and the northern orientation. Due to their good lowlight behavior, CIS thin-film modules can compensate for such location disadvantages. Initial analysis of the first month’s yields of 13,000 kWh convinced all parties of the project and proved another challenge that could be overcome - further raising the profile of photovoltaic technology in the town.