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Kraft Solar

Fascination “the Sun”

The sun is the engine for all that happens on our planet; its energy potential is truly inexhaustible. Every hour the sun emits more energy to the Earth as the whole world population needs in a whole year. All sources of energy coming from the earth are thanks to the sun, an inexhaustible source; there is no life without the sun.

The sun’s energy is an important pillar in the energy mix. KRAFT has been running a 300 sq.m. 30 KW photovoltaic plant since 2006 on the roof of its own production hall.

The good experience it has gained with this has inspired Kraft to install a second photovoltaic plant with a capacity of 45 KW in the form of a Kraft 18 m. dia. round hall and a rotatable solar roof. Measurements confirm an increase in the performance of about 33% on the basis of a tracking control.
The production hall at Uwe Kraft GmbH with office
The company site with a new office building as a round hall with rotatable solar roof
A KRAFT round hall with rotatable solar roof
Kraft also draws upon its huge experience here in building round halls in the form of the horse walkers or lunging halls.

Kraft sees this product as an excellent addition to its previous program and as entry into the future market of this century: “Renewable energy”!

Both photovoltaic plants produce about 85,000 KW per year and save 60,000 kg of CO2 being emitted into the environment.

Incidentally: the company Kraft needs about 25,000-30,000 KW per year of electrical power for our operations, so the company’s own power works produce about three time its own power requirements for the current 20 employees!

A KRAFT round hall with rotatable solar roof

A KRAFT round hall with rotatable solar roof
Sun tracking control: View from the East, 8 am. in the morning
Sun tracking control: View from the West, 5 pm. in the evening

Description of the building

18 m. dia. KRAFT round halls with a rotatable solar roof are a two-story steel construction.
The top floor is suitable for use as a storage room; the construction should be designed statically so that also heavy parts can be stored above. The size and design of the rotating door can be adapted according to individual requirements.

The Ground Floor with an area of 250 sq.m., static, is suitable for diverse designated uses:
  • for example for receiving a KRAFT horse walker, installation of horse boxes
  • for example as an office or for storage, workshop or exhibition purposes and much more

The special aspect is obviously the rotatable roof construction with an approximately 400 sq.m. photovoltaic surface, about 45 KW. The roof fulfils dual tasks:
  • protection against the effects of the weather
  • and capturing the sun’s energy

The sun tracking control

KRAFT-Solar ... the knack with the sun
The technology used by KRAFT is both ingenious and, at the same time, simple: The KRAFT sun tracking system operates fully automatically; the special sensor setting always points the monopitch roof and therefore the solar module towards the sun. The sun sensor detects the seasonal variations in the states of the sun and the roof stops tracking if the sun does not shine for while in order to save power. The KRAFT sun tracking system guarantees an increase in energy capture of up to 33% compared to a fixed installed plant.

Always in the direction of the “sun”!
The whole roof photovoltaic plant constantly adjusts its position according to the position of the sun. Larger quantities of energy are received in this way. The pictures below show the rotational movement of the roof from 8 am. in the morning (view from the East) and 5 pm. in the evening (view from the West). The top floor mounted on a slewing ring, including the photovoltaic plant, “stretches” itself throughout the whole day against the sun.
In the evening, after the sun has gone down, the roof turns back into its home position in order, in the morning, to immediately begin with gathering the sun’s energy from the first sun’s rays. This KRAFT technology guarantees the best possible use of solar energy to building owners.

Application options

Application option in the area of keeping horses
  • A round rail-gliding horse walker integrated in the Ground Floor for six horses with the possibility of using the interior as a lunging area.
  • The rotatable top floor with an area of about 240 sq.m. can serve as a storage room.
  • Here as a round stable with 11 boxes and attached paddocks on the Ground Floor and also the possibility of storing goods on the top floor.