The "Activhaus B10" was built in 2014 in the heart of the well-known Weißenhofsiedlung in Stuttgart. The Weißenhofsiedlung itself has existed since 1927 and is seen as one of the most impressive architectural building projects for homes in the present time. The Weißenhofsiedlung has also had a considerable influence on the architecture of our generation.

The "Activhaus B10" is an innovative step-by-step project. The particularly sturdy building used not only generates its own energy needs, but also those for the people who would live in it. The 100% renewable energy is used for all energy needs in the house and even supplies energy to the cars. The 2Power system used here clearly shows what it is capable of.


Technical data

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

The thermal part of the 2Power module is fully used for the recycling of the thermal ice storage heat with the heat pump and directly for heating water in the summer. No additional heating system is required. 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 recharge the electric car and to supply the adjacent building.

Technical details

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


Quote by Mr Klaus, AlphEos Smart Home and Haustechnik: "At the beginning of the autumn we still had a relatively large amount of ice in storage, which we wanted to use for the melting and heating phases - we then switched the roof to the system and within a The heat of the system is used to feed the buffer tanks for water heating (300 L water tank in the house) and is also an optional source for the heat pump in the winter Since about mid-March the temperatures were on the roof sufficient to feed the buffer tanks immediately during the day.

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