Activhaus B10

200% renewable energy in Stuttgart


In 2014, the "Activhaus B10" became a reality in the heart of the renown Weißenhofsiedlung in Stuttgart. The Weißenhofsiedlung, built in 1927, was viewed as one of the most important architectural housing developments of modern time and had a significant influence on modern architecture.

This progressive project is an innovative and sustainable building that not only covers its own energy needs as well as those of its occupants 100% with renewable energy but should also be linked to the man-made environment and electro-mobility and supply this as well


   2Power solution

Our 2Power PVT collectors, the HM 1000 Mono Black, made up the central energy source and are placed on a 7° roof slope facing east-west, almost hidden behind a small parapet wall.

The thermal portion of the 2Power module is used completely for recycling the thermal ice storage heat with the heat pump and directly for heating water in summer. No additional heating system is necessary. Now, only half of the abundant energy produced by the 2Power PVT collectors is needed for self-supply purposes. The remaining half of the electricity produced is used to charge the electric car and supply the neighboring building.

Technical details
40 units 2Power HM1000 Mono Black
East-west flat roof installation at 7°DN
Electric capacity: 10.4 kWp
Thermal capacity: 28.76 kWp



Quote by Mr. Klaus, AlphEos Smart Home und Haustechnik: "We still had relatively a lot of ice in the storage at the beginning of last autumn, which we wanted to use for the melting and warming heat phases – we then switched on the roof system and within a few days the storage was melted. The heat from the system is used to feed the buffer tanks for water heating (300 L water tank in the house) and is also as an optional source for the heat pump in the winter.  Since about mid-March, the temperatures on the roof have been enough to again directly feed the buffer tanks during the day.

The diagram shows the daily energy yield from the 2Power modules since they were started up on 15 July 2014.


   more on Gizmag

Read the article „Aktivhaus B10 monitors, manages and shares its energy” on