Residential Rooftop Backnang

Site Overview
LocationBacknang, Germany
Coordinates48.95° N, 9.43° E
Average global irradiance1,079 kWh/m2/yr
Average temperature7.9 °C, 46.2 °F
Average precipitation1,044 mm, 41.1 in/yr
Installation Overview
Date onstreamNovember 2010
System capacity9.61 kWp
Panel typeSF85-EX-B (85 W)
Number of installed panels113
Tilt angle, orientation38°, 0° South
Output13,637 kWh (01.01.2011 – 31.12.2011)
Total CO2-reduction 7,678 kg, 16,927 lbs (01.01.2011 – 31.12.2011)
InverterDanfoss TLX10
Financing Bank
Kreissparkasse Backnang

Prinz Energie- und Umwelttechnik GmbH designs and builds rooftop and ground-mounted photovoltaic and solar thermal systems. The company also sells PV modules, inverters and mounting systems.

This residential installation is one of a growing number of grid connected Solar Frontier installations by Prinz that combined produce more than 400 kWp of power. For this particular installation, the client wished to maximize their potential profits from the German feed-in tariff which favors energy that is immediately consumed in the house. The system meets that target with more than 38% of the produced current consumed on site. Over the course of one year, the installed CIS modules will supply the family with over 70% of their electricity needs.

To ensure that such a high proportion of electricity was consumed locally, it was essential that the modules offer not only high efficiency but also strong performance under non-optimal light conditions such as during early morning, late evening and cloudy days. Solar Frontier CIS modules were the first choice for having the best efficiency of all thin-film modules, and for the “Light Soaking Effect”, which enables the modules to provide more power than their rated capacity. Compared to similarly sized crystalline systems installed in the area, the CIS system produces 11.7% more kWh per installed watt of power.