Frequently asked questions

NewGreenTec Int. AG is a leading Swiss company for hybrid wind-solar small power plants and small wind turbines based in Kloten. The company has developed several advanced products for local power supply from renewable resources and has exclusive agreements with various suppliers for the international distribution of different wind turbines, wind turbines, controllers and inverters in the range up to 50 kW or 50 metres in height.

NewGreenTec Int. AG offers the following standard products for decentralised, individual sustainable power supply:

  • PowerPyramid™ hybrid wind-solar small power plant on flat roofs
  • EnergyTower™ combination of vertical PV modules and wind turbines
  • RoofPower™ dual vertical axis wind turbine on pitched roofs
  • PolePower™ wind turbine on mast or tripod support in several sizes up to 50 metres high with VAWT or HAWT combined with vertical solar modules on the mast on request.
  • PowerTree™ or SolarTree™ Vertical PV modules in the shape of a tree, with or without wind turbine
  • TripodPower™ SolarTripod™ WindTripod™ Tripod support with tree trunks and natural stone feet with
    Wind turbine and/or photovoltaics.

In addition to these standard products, NGT also offers other models of wind turbines of different designs, both vertical axis wind turbines VAWT and horizontal axis wind turbines HAWT in the power range up to 100kW nominal power. NewGreenTec AG has agreements with some manufacturers for the market in European regions, but is manufacturer-independent and can offer the customer the optimum solution for the location and customer requirements, depending on the location and wishes.

PowerPyramid™ consists of a console and the statics for mounting the wind turbine with generator, the photovoltaic modules and the control box and includes the microinverters for the PV modules, the wind turbine control system, the monitoring system and the ballast for ensuring storm resistance, or the anchor bolts.
EnergyTower™ consists of a square or rectangular tower clad on all four sides with vertical PV modules. This can be opened and the interior used for energy storage, water treatment, charging stations, devices of all kinds and e-bikes, for example, where their batteries can also be connected. The PowerPyramid™ element is placed on top of the standard tower, which also serves as a roof and where the wind turbine and other PV modules are attached.

This depends very much on the wind strength and therefore the location. The wind speed is higher above the buildings than close to the ground. The angle of the PV modules results in balanced power generation over the course of the day. With the correct positioning, the accelerated wind flow over the roof edges is further accelerated by the PV modules and optimally directed to the wind turbine, which has an exponential effect on the output. The PowerPyramid™ S model has a nominal output of around 2000 Wp and can generate up to a maximum of approx. 2500 kWh per year in good locations, depending on orientation, shading and wind conditions.

This depends very much on the wind strength and frequency, and therefore the location. The flow over the roofs is accelerated by the flow towards the buildings and the differences in air pressure on the leeward and windward sides. The wind speed is therefore higher on the buildings than close to the ground. The ten or more 700-watt PV modules can generate up to 5000 kWh or more per year, depending on the geographical location, orientation and shading.
The vertical PV modules have the advantage that they are hardly covered with snow, dust and dirt and can utilise the flat solar radiation better at the edges of the day and in winter. The small footprint achieves a very high energy yield per square metre of surface area.

Both standard appliances have the same footprint of approx. 2.3 x 2.2 metres, i.e. approx. 5 m2. In most municipalities and cantons, small buildings with a floor area of less than 6 m2 do not require a licence. The larger versions have several times the side length and height.

Both devices can be weighted down with ballast or anchored in a storm-proof manner. This means that no significant installation work is required and the risk of leaking flat roofs is reduced. Alternatively, they can also be secured with anchor bolts or ground screws in the ground.

Both are very ecological and cost-effective solutions with the smallest CO2 footprint and lowest grey energy. Local tree trunks are used as supports. The TripodPower™ uses natural stones as bases, which means that no cement or concrete foundations are required. The vertical or steep PV modules favour balanced electricity production over the course of the day and year. This means that the land can continue to be used for agriculture but also for biodiversity. These products are suitable for energy parks, for example, i.e. both solar and wind power can be generated on the same area.

These rotate around a vertical axis. This makes them independent of wind direction. This means that they rotate continuously regardless of the wind direction without having to constantly realign themselves when the wind direction changes. These wind turbines are also less sensitive to turbulent flow and are therefore well suited to buildings and low heights. Another advantage is the low noise level.

'Dual' because two physical principles are combined in one wind turbine, the so-called Savonius and Darrieus principles, named after these physicists. This means that they begin to rotate at low wind speeds and are also highly effective at high wind speeds. A special feature is the shape of the outer blades, which give the wind turbine a tulip blossom shape and a very high degree of robustness. This wind turbine is also unique due to the combination of the two physical principles. It also enjoys a high level of aesthetic acceptance.

No, not a single case is known in which a bird or bat has ever been harmed by such a wind turbine.
Most of the noise from wind turbines is generated at the blade tips. In strong winds, these wind turbines generate hardly any more noise than roof edges and trees. The maximum speed and therefore the maximum noise level can be set. The wind turbine can also be braked and switched off at any time at the touch of a button.
Prices vary depending on the equipment. Please contact us for an exact quote.
This varies depending on the country and municipality. In most municipalities and countries, small structures with less than 10 m2 are not subject to authorisation in many with less than 6 m2 of floor space. The small PowerPyramid™ and EnergyTower™ can be placed on buildings or outdoors without foundations or anchoring and can be moved at any time, which means that they do not always have to be declared as fixed installations. In many countries and regions, wind turbines up to a height of 10, 15 or even 20 metres do not require a permit. Up to a height of 30 or 50 metres, they can be approved by the local building authorities. In certain regions, wind turbines up to 2 metres in diameter are generally permitted without explicit approval.

In most European countries, appliances with a feed-in power of up to 600W or 800W can be connected to the grid without the obligation to register; above this, they usually have to be registered and large systems authorised by the electricity provider.

According to the basic laws of physics, electrical energy always follows the path of least resistance. From the connection of the wind turbine or the socket, the next consumer connected to the same phase is supplied with the generated energy. If there is no demand there, the electrical energy flows via the main meter into the extended building grid or the public grid.
However, if there is a reference on one of the other phases at the same time, the current is drawn from the grid again in parallel. Physically, this is not the same current. However, balancing electricity meters do not charge for additional energy. In accounting terms, the consumer on the second or third phase is therefore supplied with energy.

Yes, we offer the option of continuously viewing the performance and energy values on your smartphone or PC.

NGT supplies this in various sizes. The standard size is 2.3 x 2.2 metres and 2.5 metres high. PowerPyramid™ L (Large) with approx. 4.6 x 4.6 metres and a height of approx. 5.5 metres consists of 8 PV modules of 700Wp each and a 3kW wind turbine. We also offer other models with other wind turbines on request.

The standard size is 2.2 x 2.2 metres and 6.5 metres high. However, we also offer these in larger versions, including with integrated storage tanks, water treatment units or charging stations, etc.

PowerPyramid™ weighs around 230kg without ballast and just over 520kg with ballast EnergyTower™ weighs about 500kg without ballast and about 1000kg with ballast

This depends very much on the wind conditions, the orientation, the location and the substitution costs and thus the electricity price inflation. With the combination of solar and wind power, a high self-consumption rate can be achieved with lower storage costs. Our devices can be expected to run for 20 to 30 years and require hardly any maintenance apart from occasional checks and cleaning.

Yes, the appliance can be moved with normal pallet trucks or lifted on cranes or lorry-mounted cranes and transported on car trailers.
Yes, we also supply the appliances disassembled so that you can assemble them yourself using our instructions.
Yes, we also offer the wind turbines separately without or with a mast (PowerPole™) or with a bracket for the ridge on pitched roofs (RoofPower™), or special attachments as required.
Yes, in many cases it is advisable to place them in the technical room or distribution box in the building.
We pay attention to the choice of components and use sustainable materials. For the EnergyTower™ and PowerPyramid™, for example, we have chosen a wooden construction for the substructure, the console, in order to achieve a low CO2 footprint and low grey energy. We largely use untreated and local wood. We primarily use European manufacturers for the PV modules and inverters.

Yes, we also install and rent out wind measurement devices and offer site analyses for wind energy. This involves measuring and analysing the wind strength and frequency over several months or years, which is recommended for large wind farms with high investment sums, for example.

To date, we have primarily sold the products directly with advice from our experienced specialists. However, we are open to sales partners as well as installers and specialised electrical companies who are interested in selling our products.

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