SMALL WIND TURBINES

generate mainly green energy at the cold season to supply our households with electricity and heat.

operate almost without maintenance.

can easily combine with heating pumps for an efficient local energy supply.

are available in different designs with corresponding advantages and disadvantages: Basically, the lower the number of rotor blades is chosen, the higher the high-speed number or the rotor speed. A high generator speed is advantageous for the efficient and cost-effective generation of green electricity. On the other hand, aerodynamic noise emissions increase with increasing rotor speeds. A possibly required gearbox reduces the efficiency of a small wind turbine at low wind speeds. Again, a generator that is as lightweight and efficient as possible at low speeds has a relatively large diameter.

Technical data of our wind-turbine in Obergrafendorf in Lower Austria

Rotor diameter: 8,4m

Mast height: 13m

Tip speed ratio: 8

Maximum coefficient of power: 0,39

PM-ringgenerator: 120-pole

Start of feed-in: 1,5m/s

Electronic limitation of rotor speed: at 6m/s

Glas-fiber wood lightweight construction

Weight of nacelle+rotor: 160kg

Noise level in a distance of 10m: <44dB

Annual energy output (at an average wind speed of 3,7m/s): around 4.800kWh

Construction costs: 34.000€

Operational control: optically and acoustically

Maintenance effort: annual inspection of components

The electrical power of a wind turbine can be calculated with rotor area, wind speed and the total efficiency factor. A well dimensioned small wind turbine for the local wind condition can reach about 1000 equivalent full load hours per year. So the annual working capacity is given by the maximum electrical power and the equivalent full load hours.

We will support you with consulting and planning and during project realisation.