Answers to the most frequent customer questions about the
ElvWiS® wind turbines and their operation.
The ElvWiS® wind turbine does not seem to work, what can you
Normally you have received a detailed instruction manual for
your turbine, which contains a detailed and solution-oriented manual for
troubleshooting. Please take the time and work through the points mentioned
systematically; often there are only minor things that lead to the solution of
the problem. Use the options given there to measure the turbine function and
the charging capacity. If you cannot carry out these measurements yourself,
consult a professional who can safely do this. If, despite intensive search,
you cannot narrow down the problem or solve it, we will be happy to assist you
in any case.
What do you have to consider before purchasing an ElvWiS®
Estimate the required energy requirement as precisely as
possible and check whether the desired turbine can actually meet these
requirements. When selecting your wind turbine, be sure to use the specified
performance data as a basis and do not allow yourself to let you guide by
exaggerated expectations or other unrealistic reasons.
Determine the wind conditions at the future location of the turbine as
precisely as possible. This is particularly important for smaller wind
turbines, since the wind speeds that are close to the ground often vary
greatly or the wind flow is influenced or even prevented by various obstacles.
The best way to do this is with a local/portable anemometer that allows you to
take readings in varying wind conditions at the installation site.
Check the circumstances of the planned mounting location, this should offer
enough space for the turbine and must be out of the reach of people or moving
objects. For different site conditions we offer models in several sizes with
varying mounting options. If you are not sure whether an ElvWiS® wind turbine
is suitable for your project, please ask us before making a purchase, we will
be happy to assist you. Please also read the following chapters and use our
wind power calculator.
What performance can be expected from the ElvWiS® wind turbines?
First of all, the performance of a wind turbine is generally
dependent on its design, the associated efficiency and then primarily on the
available rotor surface and the wind supply. The mechanical power of the
turbine thus results from the size of the rotor and its efficiency. Our
brushless and cogging-free disc generators are optimally matched to the
respective rotors and achieve efficiencies up to 96% when converting the mechanical
power into electrical energy, which is a very good value.
Since the output voltage of the generators is proportional to the rotational
speed, the start of the power output depends on the voltage of the battery
system used. The power output starts at zero when the charging voltage is
reached and then increases proportionally to the wind speed and power. For an
exact estimation of the expected performance you will find under
„Help/Information" the "Power Calculator for Wind Turbines"; on this page we provide you with the model-typical surface
dimensions and efficiencies, with which you can play through using the linked performance
calculator all imaginable combinations of different parameters. In our article
descriptions, we only specify the rotor power that the rotor can convert into
mechanical energy under optimal conditions, as the actually delivered
electrical power can vary greatly depending on e.g. the load, charge controller
and state of charge of batteries. Also note that the location and environment
of the turbine significantly affect the wind conditions; the highest possible
performance can only be achieved with a free wind access without turbulences. Important: The rotor performances given by us are not to be confused with the
generator power, with which the indicated power values refer to the generator
operating condition under full load with power adjustment.
What is the energy yield that can be gained from the wind?
The maximum achievable power of the wind energy is 59%
according to Betz. Depending on the degree of efficiency, each wind turbine can
convert only a certain proportion into a mechanical and a coupled generator
thereof into electrical energy. To get a feeling for the wind power, it is
important to know that the energy in the wind increases eightfold when the wind
speed is doubled. This means that the turbines can generate relatively little
power at low wind speeds, but at higher wind speeds, power production increases
dramatically. For this reason, it is decisively that the planned location of
the turbine is as accessible to the wind as possible, especially at low average
For which areas of application are the ElvWiS® wind turbines
The wind turbines are suitable for the efficient generation
of electricity in places that are often not connected to the public power grid.
This can be e.g. Campsites, measuring stations, remote buildings (mountain hut,
garden shed) or boats. On the one hand, the turbines can be installed
stationary and, due to their compact dimensions, low weight and efficient
operation, are also suitable for mobile applications. The advantage of these
usage variants results from the self-sufficient power generation, in which
there is no connection to the public power grid or this is simply too expensive
and/or too labor intensive in comparison.
In principle, feeding into the power grid or supporting home supply is
possible, but at the moment it is at least financially not profitable in
relation to the purchase price. However, if in such an application case the
energy supply takes place primarily for environmentally conscious and
future-oriented reasons, then this is exemplary and welcome in view of a
low-emission future. Here applications variants make sense, for example, where
it is important to generate as much energy as possible yourself and from known
environmentally friendly sources or to store the generated energy yourself and
then use it for own use.
What advantages do ElvWiS® wind turbines offer in terms of energy generation?
The user often has to deal with very different wind
conditions at different locations. Our wind turbines were consequently
developed so that they can produce electricity efficiently even at low wind
speeds and remain operational even at high wind speeds. In addition, strongly
changing wind directions are used sustainably for energy production. The
background of this concept is the highest possible energy yield at various
locations throughout the year.
The performance values of our turbines often appear at first glance to be
relatively low due to the comparatively small rotor areas, but when looking at
the medium and long-term energy production, the picture is completely
different. Knowing that pure maximum power values do not allow a good
estimate of the long-term energy yield, we deliberately avoid specializing our
turbines in the low or high wind design. The strengths of our turbines lie
primarily in the universal application for a wide wind force range and
demanding wind conditions as well as in a high as possible system efficiency.
The seemingly disadvantage of the relatively low maximum power values compared
to other, mostly larger turbines is effectively converted into an advantage in
the medium and long term by the combination of these properties.
How loud are the ElvWiS® wind turbines in operation?
Assuming that the installation of the turbine and the
adjustment in the holder has been carried out correctly, the turbines are
virtually inaudible compared to the surrounding wind noise. The wind noise
heard in many of our videos is generated solely by the wind on the camera's
unprotected microphone. The generator of the turbine can produce a quiet
whirring during operation, which is typical for electric generators in power
production. For real wind energy fans, this sound is also a sure and good sign
that they are currently receiving free energy.
How do the ElvWiS® wind turbine models and series differ?
The design of the wind turbine results largely from the
conditions of use and then from the personal requirements and capabilities of
the user. Particularly suitable for mobile use are the ADVENTURE models, which
can be easily assembled and connected, and there are also various demountable
variants that are very easy to transport. The ALUMINUM models are primarily
designed for permanent installation, although there are also fixed variants of
ADVENTURE turbines. For the ALUMINUM models, you need a little manual skill in
the assembly, the electrical connection and the adjustment, this is largely
eliminated in the ADVENTURE models. If you just want to have as much power as
possible, then you are well supplied with the large ALUMINUM models. The
ALUMINIUM hybrid models are ideal if you need a turbine for permanent
installation that combines all the design advantages of the ALUMINUM and
ADVENTURE series. Here are important features, such as a user-friendly
assembly, highest performance and excellent material quality vividly combined.
About features such as quality, appearance, conspicuousness, etc., you can
decide according to your own wishes based on the specific article descriptions,
where we will try to guide you to the best choice of your wind turbine.
Can you combine the ElvWiS® wind turbines with solar systems
and how does that work?
Yes, that is highly recommended. First of all, solar and
wind power complement each other almost perfectly during the year. When there
is less sun, there is usually more wind and vice versa. Wind power also has the
advantage that it is also available at night, which the solar energy logically
If you e.g. operate an existing solar system with a 12-volt battery system, you
can easily connect the turbine with the help of our wind charge controller in
parallel to the solar charge controller to this/these battery/ies. Each system
then has its own charge control and is independent by itself. From the point of
view of the battery, it does not matter which charge controller it is charged
from, whether several regulators charge at the same time or one regulator
charges slightly higher than the other. It may be necessary to ensure that the
battery system has a sufficiently high capacity, otherwise the battery voltage
can be increased so much by the dominant charger, so that the charge controller
of the weaker charger detects the battery as full and stops its charging
activity. Basically, however, this is also not harmful and enables a good
charge even with smaller capacities when solar and wind power alternate during
the day or supplement. If you use a battery system with a different voltage
than 12 volts, just look at the following response to the battery voltages.
How can the ElvWiS® wind turbines be connected to a power station?
In combination with a power station, it depends on which
battery type with which voltage is installed and whether there is direct
access/contact to the battery. This can be the case, for example, via the
vehicle charging port. If the battery voltage of approx. 12 volts can be
measured here and either a lead or LiFePo4 battery is used, then our standard
wind charge controller could be connected directly here. The second possibility
would be the charging access for a solar panel. Depending on how large the
input voltage range of the solar charge controller is (up to at least 60 volts
DC), our turbine could be connected directly to this input using a 3-phase
rectifier. You have to consider that a solar controller does not have
protective functions for the turbine and that if the controller disconnects the
input when the battery is full, for example, the turbine will go into idle mode
in an uncontrolled manner in case of doubt. This can be prevented by either
only using the turbine when the power station is actually capable of receiving
electricity, or by ensuring that energy is permanently drawn so that the
turbine can work continuously under load.
If none of these options can be implemented, the problem can usually be solved
with a small 12-volt backup battery connected between the wind charge
controller and the vehicle charging input. In mobile homes, for example, the
car battery can also be used for this purpose. This battery can be charged with
the wind charge controller and is recognized by the power station as a vehicle
charging source. This solution can also be used in general to decouple the
turbine from the charge management and control of the power station and, for
example, to use the backup battery as a central collection point for all
12-volt-based charging systems and then transfer the energy via just one input
to the to be able to feed power station
For which battery voltages are the ElvWiS® wind turbines suitable?
In general, the rotor-generator combinations of the vertical
wind turbines are optimized for a system voltage of 12 volts, for which we
offer the right wind charge controller. If you use other system voltages, the
solution depends on whether the system consists of 12-volt components. If yes,
the charge may be on a single 12-volt component when the charge is allocated
to the other battery components via a so-called balance charger/battery
balancer. These balance chargers are recommended for the longevity of the
battery system anyway, as this is always ensured a balanced battery state of
charge. When choosing the balance charger, make sure that it actually
redistributes the charge and not, as is the case with some models, destroys the
If there are no 12-volt components, the output voltage can be increased with
appropriate equipment. These can be voltage cascades or certain step-up/boost
charge controllers that are capable of doing so. You can also use our boost
charge controller for 24-volt systems that do not consist of 12-volt
sub-components. However, you then need higher average wind speeds and/or good
wind conditions in order to comfortably reach the starting voltage of 15 volts
on the charge controller, which is required for 24-volt systems. In this case,
low wind strengths would not be utilized to generate energy.
Which charge controllers can be used for the ElvWiS® wind turbines?
The 12-volt wind charge controller we offer has proven
itself for many years and is therefore highly recommended. This wind charge
controller contains a rectifier and regulates the charge of the battery, in
addition it slows controlled down the speed of the wind turbine with full
battery or disconnected battery cables. For other charge controllers, it is
important that the input voltage range is wide enough, even the maximum current
(Ampere) must be able to be processed.
Many solar charge controllers disconnect the circuit when the batteries are
full, etc., which causes the turbines to idle and spin unnecessarily fast. Due
to their design as counter-wind runner, the rotation speed of the turbines
does not increase to the same extend as the wind speed, but such an
uncontrolled operating state is not advantageous with regard to material and
longevity. In the case of MPPT charge controllers, the applicability must also
be checked on a case-by-case basis, since the mode of operation of a wind
turbine is very different from that of a solar panel. For example, the MPPT
controls are often too slow to follow the rapidly changing operating
conditions. On the other hand, other MPPT controls simply choke the turbine in
an attempt to extract the maximum power from the generator.
How do you carry out the electrical connection of the ElvWiS® wind turbines?
In advance: If you are not sure how to do the wiring, be
sure to ask someone who knows it or let this be done by a specialist.
Otherwise: Fix the rotor of the turbine. The generator
produces a 3-phase alternating current, therefore connect the charge
controller/rectifier with all three phases of the generator cable, the order of
the three phases is not relevant for this connection. Then connect the cables
of the charge controller/rectifier to the battery or to the consumer (red + /
In comparison to a charge controller, a rectifier can also be used for battery
charging, but it has no charge state monitoring and does not work as
efficiently. Therefore, periodically check the battery level or use a suitable
charge status indicator when using the rectifier for battery charging. The
rectifier can also be used very well for smaller DC applications.
Use a sufficiently dimensioned (melting) fuse, this fuse must be installed in
the positive lead (red) after the respective power converter. Also note the
specifications of the charge controller/rectifier. After connecting all cables
and inserting the fuse, loosen the rotor to start normal operation.
How can you use ElvWiS® wind turbines to feed into the grid?
On this subject, it is essential that you also note our
explanations in the section "For which areas of application are the
ElvWiS® wind turbines suitable?"
First of all: The generators of the turbines generate a three-phase alternating
current, but this is completely unsuitable for a direct connection to the power
grid, as the alternating current frequency fluctuates with the rotation speed
and is not matched to the grid frequency.
In order to feed into the grid, an alternating voltage that is synchronized
with the grid frequency is required, which can be generated with a grid tie
inverter. In addition, this inverter must be equipped with all common
protection mechanisms that are necessary for the country-specific requirements.
A combination of turbine, wind charge controller, buffer battery and a battery
grid inverter has proven to be practicable for a well-functioning grid feed.
These grid inverters are able to feed the energy directly from a battery into
the power grid. Since such inverters also have a certain self-consumption, we
always recommend our largest turbine models in order to be able to implement
such an application with excess energy. The advantage of the constellation
described here is that you can take the generated electricity from the battery
yourself at any time and connect several turbines, each with an inexpensive
charge controller, to the same buffer battery. You then only need a single,
mostly cost-intensive grid inverter. In addition, you can also connect solar
panels with appropriate battery charge controllers in parallel to this battery.
A direct feed-in via solar micro inverter does not seem to be efficient at the
moment. The input voltage range of these inverters often does not match the
output voltage of the turbines and the regulation is usually too slow and tends
to stall the turbines. As with a solar panel, the inverter tries to regulate in
the direction of maximum power output, which can also be achieved with a
relatively simple control strategy for solar panels, since there are no
additional mechanical components. In the case of wind turbines, however, this
has the effect that the generator is put under maximum load and the turbine is
braked down out of the optimum working speed, which makes operation with these
inverters very inefficient.
May I operate the ElvWiS® wind turbine on a motorized vehicle while driving?
No, this is not allowed! If you do this anyway, you may
endanger yourself and other people. The turbines are designed for operation in
normal wind conditions, including strong gusts and high wind speeds in storms.
During extremely severe storms, our turbines, like all other movable objects,
must be secured. Make yourself aware that at 80 km / h with a vehicle, the
turbines are permanently exposed to wind conditions such as a storm. If there
is a headwind, this is added to the speed of the vehicle. When the wind speed
is doubled, the power in the wind increases eightfold; in the high range, as is
known from storms, this can have dramatic consequences.
In addition: Don't waste fuel, your vehicle is not a perpetual motion machine.
You have to use much more energy in the form of fuel for the wind energy that
you can generate while driving than you can recover from the electricity from
the turbine. In this case, your alternator will generate electricity much more
How can I correctly estimate the wind force without measuring instruments??