Hybrid Wind Generators

“The Wind Energy” innovation for your home and company


The project began in January 2011, by the desire to develop a space-saving resource of clean and renewable energy.

The idea of designing a generator, suitable to the demands that emerge from the international market was born. At that moment the first 3,5 KW engines appeared.

At the Politecnico University of Milan we continue to perform a series of tests in the wind tunnel for simulations and performance optimisation. The tests gave excellent results.

This is how the Ecolibri 3,5 and 9,9 Kw vertical hybrid micro wind generators were born.


  • Dimensions and materials
  • Sail diameter
  • 5.000 mm
  • Sail height
  • 5.000 mm
  • Swept area sm
  • 25.000
  • Blade material
  • Aluminium
  • Arms material
  • Aluminium
  • Number of sails
  • 3
  • Sail and generator weight
  • 150 kg
  • Warranty
  • Standard warranty
  • 2 years
  • Extended warranty
  • 2 years
  • Technical data
  • Power / Wind speed
  • 11 kW a 10 m/s
  • Start up wind speed (cut in)
  • 3 m/s
  • Start production speed
  • 4 m/s
  • Shut down speed (cut off)
  • 16 m/s
  • Generator rated power
  • 11 kW/ 150 rpm
  • Generator max power
  • 13 kw
  • Generator rotation speed
  • 150 rpm
  • CE Certification
  • Yes
  • Transmission type
  • Direct
  • Electromachanical brake
  • Yes
  • Assisted starter
  • Yes
  • Controller brakin
  • Yes



The key feature of the micro wind turbine ECOLIBRI’ is to have an environmental impact which is completely irrelevant, even in the context of a mini wind turbine camp consisting of more turbines.

The shape, unique in its kind, makes the turbines minimally invasive both for their small size and for the chance to be painted with colours that reflect the surrounding environment.


The noise of the wind blades ECOLIBRI is undetectable (<20Db) even in the presence of strong winds, as the blades cannot rotate at a higher speed than the wind itself and consequently do not cause any kind of hiss and noise.

Stand Alone Energy Storage Solution

Let us know more about your needs so we can study and offer the best custom stand-alone energy solutions.

The hybrid micro wind turbines with vertical axis Ecolibri 3,5 and 9,9 kW are studied for a “stand alone” use where the power grid is not available. The obtained energy will be stored in batteries and will at your disposal 24 hours a day.

Here’s just a schematic example of a complex solution.


  • The following components will be supplied:
  • Ecolibri hybrid mini wind generator, the details are available in the technical data sheet.
  • Electrical interface, complete with inverter and the equipment needed to operate the plant based on wind generators.
  • Battery dimensioned according to the requirement of the user consumption (optional).

Turbine Development and Installation


  • On grid: the turbine is connected to the grid through a counter
  • Off grid: stand alone installation supported by a battery pack. The system can be implemented by other renewable
  • Average wind speed above 5 m/s with Weibull K distribution factor ≤ 2;
  • Site exposed to predominant winds with no obstacles higher than 10 m;
  • No specific site restrictions (landscape, geological, environmental)
  • Easy access for heavy vehicles;
  • Connection at less than 200

It goes as follows:

  • site zoning mapping;
  • verification that no restrictions are present;
  • once all the data are collected, the site can be It is advisable to bring an anemometer and a GPS navigator to detect the exact position.

On site you can immediately notice:

  • clues that indicate wind presence throughout the year;
  • wind pattern according to the sites orography;
  • access point for heavy vehicles and authorizations to enter if requested;
  • maneuvering space needed for assembling the turbine;
  • the location of the closest connection to the

All these factors must be carefully evaluated as they affect the final cost of the installation and its pay-back time.

In order to understand if a site can host a wind installation, the wind data have to be retrieved from:

  • airports;
  • harbours;
  • weather stations;
  • windsurfing

If that is not possible, Ecolibrì offers the software based screening.

Choosing the right station is essential. It must have:

  • certified anemometer;
  • second anemometer for analyzing wind direction and rugosity;
  • data logger with protected data;
  • memory stick resistant to low temperatures such as -15°C;
  • enough autonomy for remote sites in case there is no grid or the photovoltaic panel is not able to generate energy for the battery;
  • correct pole height close to the hub The structure has to be stable and stiff in order to avoid oscillation that could compromise data collection.

The anemometric station must be positioned where the turbine will be installed. At this point, it is essential to check the site in order to avoid possible wind turbulences caused by the morphology of the terrain.

Once the wind data are collected, it is possible to determine the expected turbine production with specific software. Attention: wind intensity and distribution may vary from year to year.

Rooftop installations are more complex than ground ones. During the project evaluation you need to consider the following factors:

  • m2 roof payload;
  • main wind direction;
  • building resonance frequency;
  • building maximum lateral

Resonance frequency happens when an object excites the frequency of its own structure (pole, building). Every structure has its frequency. If frequencies overlap, they can increase  their energy by 100 times, and in some cases that can break the structure.

In case of a rooftop installation it is advisable to use a structure that distributes the forces  evenly (lateral pression, torsion, and weight) because most of the times the building frequency is unknown.

The structure should be stiff in order to push the resonance point beyond its breaking point. The resonance can be avoided by slowing the rotation down. Ecolibrì provides every installation with a triaxis sensor configured on certain tolerance thresholds that slow down the turbine rotation when the limit is exceeded. Ecolibrì’s priority is to guarantee the installation  safety.

The calculations must be done in accordance with:

  • the rules and standards set by each country in respect with the guidelines set by the European Union in terms of infrastructure safety;
  • geological report of the

The turbine manufacturer has to provide the civil engineer with all the turbine data (area, weight, rotation speed, pole structural calculation). Alongside with these data, a valid geological report has to be attached. Ecolibrì standard plinths are calculated  according to  the IEC 61400-2 “Wind Turbines – Part 2: Design requirements for small wind turbines” international norm.

Turbine positioning is very important in order to guarantee maximum efficiency in energy production. If the turbines face the wind the distance between them must be at least three times the turbine diameter (measured from wing to wing not pole to pole). If turbines are installed one behind each other, the minimum distance required is ca. 10 times the turbine height (rotor). If the turbine position does not follow a straight line, the distance can  be reduced (5 times the height).