Frequently Asked Questions

Here’s a list of questions that could help you on your renewable energy journey!


Please use command+F or control+F to search our FAQ page.


What is off-grid and what is on-grid?

On grid means that you attach your system to the utility. Off grid means that you live independent of the utility and provide all your own power.

An on-grid system doesn’t need a battery because you use electricity and sell your extra to the grid and use grid electricity when your wind system doesn’t produce enough. In effect, the grid is your safety backup.

If you disconnect from the grid, it means that you need extra capacity to make sure you can charge your batteries, and that your batteries have enough capacity to carry you through periods of no wind and no sun, if you own solar. Having wind and solar together gives you a greater chance of being able to recharge your batteries.

You have to determine the capacity of your batteries by looking at your electric usage and by knowing how long, in the worst case, you might have no wind (or no solar) energy feeding the battery. To go off-grid, you should plan on having extra energy capacity and extra battery capacity for worst case scenarios.

In an off-grid system, your wind turbine’s output passes through a charge controller into a battery and from there into an off-grid inverter, which synchronizes to the voltage (120 or 240) of your house or building without synchronizing to the grid.

What size turbine should you pick?

You can adjust your available space and the power available from the different turbines. The bigger and larger the turbines, the more cost effective, in general. One has to take installation costs into account. Our wind turbines perform more efficiently in a cluster effect.

Here is a table about the way to locate the different sizes, in general:


Size Location
Large (6 meters high) Land or very strong roof
Medium (3 meters high) Land or strong roof
Mini (1 meters high) Land or regular roof
When do you get your wind turbine?

The estimated shipping date from the ordering date is 6 – 15 weeks. We are happy to provide you with an estimated delivery date. Please contact us.

How do you choose the right product?

We would be happy to help you to choose the right wind turbines to reach your sustainable development goals. Please contact us by email.

Can I order more than one product at a time?
You should because then you benefit from the cluster effect of the turbines making their neighbors perform more efficiently.
What makes Flower Turbines special?

We try to solve all the issues of small wind turbines that could prevent them from being used in a tight environment, near people, and near and on buildings. As a starter, they must be quiet and pleasing to the eye. Our game changer is that our wind turbines perform better when close together.

We also provide solar and charging solutions for e-bikes so you can also encourage clean transportation.

How much power do the turbines generate?

We have several models. The amount of power they make depends on the turbine and the wind speed. A power curve is a plot of the power produced for a particular wind speed. The practical answer to your question is that you want to first find out what your average wind speed is, then determine where you can put turbines of what size and how many, and then figure out how much power they produce.

How many wind turbines will power a house?

How many turbines will power my house or business? We can answer that if we know your electricity consumption, the wind speed, the size of your property—on the ground or on the roof– and the size of wind turbine you can fit.

Are these turbines certified?

Our products are not UL or CE certified, yet. We are in the process of getting these certifications. You will have to speak with your local city ordinance to obtain permits and permissions.

Can this power my house/gym/lights?

It depends on the turbine and your wind speed and the power consumed by your house/gym/lights.

When will it be available in Australia/Peru/India/Argentina/Costa Rica/etc?

It will take longer for us to sell competitively in distant or low-cost countries, but we will get there. We can sell to all these countries from the US if you want to pay shipping costs.

Do you have a price list?

For countries outside of Europe, the prices are on our US store. Our EU staff sells projects so each project is priced differently and there is no price list.

What is the duration and coverage of the warranty?

Two years on parts we produce. Parts that we purchase assume the warranty that the supplier offers. We do build the turbines with the aim that they should last 20 years.

Do you have a list of locations where you have installed turbines?

We would not give the private locations so as not to disturb private citizens, but you can see where they are installed in several municipalities in Europe, such as Rotterdam, Nisseward, and others. You can also see them by going to a Coldplay concert and viewing the turbines on top of their lighting towers.

What is the lifetime of the turbines?

We build them to last 20-40 years.

Do the turbines come with batteries?

As a default, no. We could provide them.

How many turbines have we sold?

Over 50

What are the transportation costs?

Some on our web store in the US are automatic. Internationally, it is a custom quotation.

Estimated delivery time?

1-6 months depending on the model. This is once the order is fullfilled and shipped from our warehouse. 

Do you deliver the turbines in one piece?


Can I put my logo on a turbine?

Yes. Contact our support staff for a consultation.

Is the output AC or DC and what is the voltage?

This is a complicated question. The electronics for a wind turbine is put together in several steps.The voltage can be different at each step and vary according to wind speed. The shaft is connected to a generator that produces unusable AC. That electricity passes through a rectifier as part of a charge controller that produces DC. At that point, the DC electricity can be used to (1) power DC appliances, (2) charge a battery that then powers an inverter, (3) power an inverter directly. 

Note that the voltage from the inverter is 110 in the US and other countries and 220 in Europe and other countries.

How much do I pay for custom colors?

It depends on the turbine size.

Do the turbines present problems with harmonic vibration?

In short, yes.

We measured that for our medium size turbine in the wind tunnel at the University of Delft. It bumped a little higher at wind of 13-14 meters per second (which is rare) and it was well within safe ranges and very low at all wind speeds.

Where can I find the sound test reports?

You can view it here.

Do you sell batteries to store energy produced by the turbines?

We can.

Do I get a discount when I buy a lot of turbines?

If it is a large project, yes. The larger quantities shown on the website have the discount built in to the price.

What is the starting speed of the turbines?

Our turbines start spinning at less than 1 meter per second (2 miles per hour). It produces little, but we start making some useful energy at around 2 m/s. Remember that other turbines usually start spinning at 3 m/s and start producing useful energy at 4 m/s.

Can we get 3D representations/renderings of the turbines?

If there is a good reason for it.

How many small turbines would I need to power up one house?

You can do that in several ways:

1. Get a hand held anemometer and measure it at different times of the day.

2. Get a standing anemometer (cost usually $100-300) that enables export as a spreadsheet and you can get the average, highest, etc.

3. Use online resources. Weather Underground has a lot of people in many locations who measure the weather. There are other sites like Meteoblue and IRENA. The US Department of Energy has wind maps for each state This will tell you generally ifyou are in a good region. The problem with all these sites is that you usually don’t know at what height the measurements were taken, whether there was a building blocking the person taking the measurements, etc. Therefore, the best way to do this and spend no money is to check the general wind speed for your region using an online resource and see if this matches your personal experience. But there is no substitute for taking measurements.

What’s the difference between this and any other horizontal wind turbine - a similar shape for a fraction of the price?

They indeed are more expensive than horizontal axis turbines. There is more to turbines than initial price. The fan-type ones are noisier, not so pretty, and more dangerous for people and wildlife, so harder to use near buildings and people. Those locations are our market. It’s not really competition for that reason. In addition, our turbines start producing electricity at lower wind speeds. Also, you  have to look at total cost of ownership. Horizontal axis turbines require more maintenance and break down faster because they are not symmetrical.

Can I save on my electric bill?

The savings will depend on your wind speed and the price you pay the utility. In general, the largest size is currently the most cost-effective one, and they are meant to be bought in a cluster. Just like buying many solar panels at one time is more cost-effective than buying and installing one at a time

Do they freeze up when not running?

We can’t guarantee it, but we have had our turbines opporating in the snow.

A Government subsidized industry?

We wish it were. We are trying to make this work without the need for government funding.

What's the weight of each turbine?

See the brochures on the web site for the latest figures, as each version changes slightly. For approximate use: Small: 50 kg. Medium: 200 kg. Large: 1000 kg.

How many turbines do I need to be cost effective?

The more the better and the larger the better. That means a lower cost of installation per turbine and more cluster effect. The cost-effectiveness also depends on your wind speed and cost of electricity.

Can I buy 2 different sizes? Do they all have to be the same size?

You can buy different sizes at the same time. You will have a better cluster effect if you put several of the same size next to each other.

How much power do you get out of a Flower Turbine in a year?

It depends on the size of the turbine and the wind speed. 

What is the durability and expected life of the blades?

We build them to last at least 20 years. We tested them at 20 meters per second in a wind tunnel for an extended time and there were no problems.

Are they vertical axis magnetic levitation wind turbines?

Vertical axis but not levitation.

Are the blades recyclable?

This is an important issue. The way it is being solved in Europe is by using them to make concrete. The blades are ABS plastic for the smallest size and fiberglass for the larger sizes. In some cases we are using aluminum, which is easy to recycle.

Do you make your own electronics?

As of summer 2022 we use off the shelf electronics for the generators and inverters but have started to produce our own charge controllers in the US..

Are your turbines made of anti-corrosive material?

Fiberglass is not corroded. For sales near the sea, we would include such protection and you should contact us before buying for special treatment and costs. We are making certain parts to be corrosion resistant by default.

Can they stand up to corrosion caused by being practically on the beach?

Yes, if properly coated.


How do you connect and install your product?

You will need a local installer. Our current default is to ship our wind, charging, and solar products ready to install.

After physical installation, an electrician should make the electrical installation.

We are happy to help you with the installation. We work with qualified partners who can help you with the installation in some locations.

Where should you put your turbine?

Determine the place where you want to put your turbine. An area of higher wind is almost always the best choice.

If it is on a flat area, ground or roof, you should have exact measurements of the location and the direction of where most of the wind comes from. You will ideally place your group of turbines so that they are side by side perpendicular to the direction of the wind.

We can help you to determine the best place for your wind turbines when you send us your weather station data.


Can I put it on a boat?

Yes, there are certain issues, such as that we will have to provide extra coatings to protect against salt damage.

What is the minimum required distance between the turbines?

The turbines cluster best at a distance that is obtained by multiplying the turbine diameter at its widest point by 0.1. That is the distance from the center of one shaft to the next. The effect works well till around the diameter times 0.3. Note that for vertical axis turbines such as hours the diameter is measured in the horizontal plane.

Can the turbines be placed in a coastal area?

Yes, those are often areas of good wind. However, they may need extra anti-corrosion treatment.

Can the turbines be connected to the batteries we already have for our solar panels?

Yes, but the connection will be customized for high voltage batteries. Write us at with specific information about your project and battery.

Can the turbines be connected to the inverter from our PV system?

Ideally they should have a separate inverter, but in some cases they can, particularly when there is a battery that connects to the inverter.

What is the size of the inverter?

It is different for different projects.

Can the large turbine be installed on my roof?

No, unless it is a very strong roof.

Can the turbines be installed on top of a pole?


Do the turbines connect to an application or computer program to follow up on the energy production?

Yes. Usually the inverter company has such a program.

Does Flower Turbines arrange the installation?

In some locations, yes, but generally that is your responsibility; we will be glad to advise the installer.

How often do they need to be maintained ? How much does service/maintenance cost annually?

Simple external inspection once a year. Check and/or replace bearing oil every 2-3 years, depending on how windy it has been. Costs varies upon number of turbines and local material costs.

Do you help us with applying for a permit?

We give you the information you need, but the rest is up to your civil engineer.

Can they be placed at the peak of residential roofs?

Not yet. We are working on a solution for slanted roofs.

Will city ordinances allow me to install these turbines?

Our products are not UL or CE certified, yet. We are in the process of getting these certifications. You will have to speak with your local city ordinance to obtain permits and permissions.

How much square footage needed for installation on the roof or ground floor?

It depends on the size of the turbine. These are approximate. Extra room should always be considered for access and fencing. There is also some flexibility as to the distance between the turbines for the cluster effect. Small: 0.5 meters diameter. Medium: 1.0 meter diameter. Large: 2.5 meters diameter. Then multiply these numbers by 1.1.

Do you need to alter the roof for mounting/placement?

It depends on the strength of the roof. Your civil engineer needs to approve it.

How is it being secured in place?

It should be bolted into concrete on the ground or concrete or steel on the roof.

Does a storage battery come as part of the installation?

That is the job of the installer when it is part of the system. Some systems are grid connected without batteries involved.

About Wind

How do you measure your wind?

The most important thing you can do first is measure your wind with one of many reasonably priced and commercially available kits, often called weather stations.
If the average wind speed is 6 meters per second or above, you almost always have a great return on investment. 5 meters per second usually means a good return on investment. Gusty wind is better than lower but steady wind.

Look at some free online resources to get a feeling as to whether or not you are in a high wind area. There is a caution that comes with all these resources. Wind can be very specific to a specific location and height. Many of these resources don’t tell you exactly where they were measured and at what height. They are useful as a starting approximation.

International information: Weather Underground:

Enter your location, then click on Others, and scroll down to the bottom of the page for the wind graph.

International information: Meteoblue: To take full advantage of this site, click on the left side bar where it says Archive Climate and then under it Weather Archive. It takes you to a page where you can get wind speed measurements or projections over the course of a year.

US Department of Energy:

This site has useful information in general and has links to wind maps of each state. Many countries have their own meteorological services and provide data to the public.
You can take that approximation and generalize by asking yourself questions: Are those websites generally accurate about what I feel the wind is? Is my location open on all sides so the wind can come through easily? Is my location in a geographical wind tunnel that accelerates the wind and makes it higher than the norm in my area?

Ultimately, the best solution is to invest a small amount of money and get data from a weather station. Look for one that produces a spreadsheet so that the data can be analyzed. The more often the weather station can take readings, such as every 10 seconds instead of every minute, the better. We do not make these weather stations. We simply recommend any of the reputable models that are in the price range of $100- 200 each. If you are building a wind farm involving megawatts, then you should approach one of the commercial testing services.

Can you check wind speeds at our address to ensure the wind turbine would be a practical option?

You can do that in several ways:

1. Get a hand held anemometer and measure it at different times of the day.

2. Get a standing anemometer (cost usually $100-300) that enables export as a spreadsheet and you can get the average, highest, etc.

3. Use online resources. Weather Underground has a lot of people in many locations who measure the weather. There are other sites like Meteoblue and IRENA. The US Department of Energy has wind maps for each state This will tell you generally ifyou are in a good region. The problem with all these sites is that you usually don’t know at what height the measurements were taken, whether there was a building blocking the person taking the measurements, etc. Therefore, the best way to do this and spend no money is to check the general wind speed for your region using an online resource and see if this matches your personal experience. But there is no substitute for taking measurements.

Are the wind data loggers using wifi connectivity?

If you mean for the weather measurement equipment, you need to ask whoever sells those. The main thing you want to look for is the ability to download a spreadsheet of wind speed.

We did one in a wind tunnel for the middle size and are waiting for the report. In the meantime, the graph with blue dots on gives real data over a long period of time with a version that was around 4.5 meters high in a location with low wind speeds.

What do I do if I live in an area that is not frequently windy?

If you don’t have a wind resource, then you shouldn’t get them, unless you find them beautiful. Another reason to get them is that they balance a solar microgrid by providing power at different times so that solar plus batteries could be more expensive than solar, wind, and batteries because you need a lot of extra expensive batteries to cover those times when there is no solar.

Investors & Resellers

What do we get for our investment? Can you tell me where my money went?

Flower Turbines is not yet on a formal stock exchange. Startengine does have a platform, which we have joined, where we have the option to allow the shares to trade for limited times. You own a percentage of the company. Your money goes into staff, patents, facilities, R&D, etc.

What is the process of becoming a reseller?

Contact with a company profile and personal resume. Then we will contact you.

Do you offer exclusivity?

Rarely, but it is possible if you define an area and commit to buying sufficient numbers that increase each year.

When and how are you able to get your investment back.?

There are several ways that startups get the invested money back to investors: The most common are buy-outs and IPOs.

When will Flower Turbines go public?

We are not allowed to answer questions like this according to SEC regulations. Any forward-looking statement that could give one person emailing us an advantage over another person is prohibited. Obviously, going public is an option for a startup and we will inform all investors equally and publicly if that happens.

Do StartEngine investors get a discount?

Some very early Startengine investors do get discounts and they were informed twice if they were in that category, and we will inform them again as a courtesy.

When will I see my investment?
We don’t know, and if we did know, we have to tell everyone publicly. We can’t give information like this to one person without giving it to all, according to SEC regulations. The usual occasions that you will see your investment pay off from a startup are IPO or acquisition.
–for other investment FAQ, go to and look back at all the investor questions.
How do I sell shares I purchased through
Flower Turbines is a member of the Startengine platform for selling shares to other Startengine investors. However, this is only available when we open it up for exchange. We hope to do so for a month in the coming year, and, if so, will announce it on the platform.
When will us investors start seeing some dividends?
We do not give dividends and it is rare for a startup or high growth stock to give dividends because the money is better spent when reinvested for growth. If in the future we do so, it will be announced for everyone.
How I check the status of my shares?
It is all handled through your Startengine account. If you have any problems, you need to contact StartEngine.
Do I need to report a change of address to you?
You should do that with startengine. If your email is no longer valid and you have a new one, you should report that to both Startengine and Flower Turbines.
What does the 10 to 1 split mean to me?
First, it’s a 1 to 10 split, so that if you had 10 shares before, you have 100 now. Your percentage ownership of the company hasn’t changed. The company has more shares and you have more shares.
Usually a stock split is made when the price of shares starts getting higher and higher, and it makes it easier for people who only have the money for a few shares to get “a piece of the pie” so it increases accessibility of the average person to capital markets. That is also what equity crowdfunding does: it makes it possible for the average person to get in on the early stage of promising companies.
So, to return to what it means for you, it means easier access to shares and more participation in the company, which makes the company to some degree more valuable.
Why don't I have a record of my money invested from Flower Turbines?
You get that from Startengine. They have a dashboard for each investor. You need to log in to your account on Startengine. Some people who have not seen it turned out to have not completed the information Startengine asks from them.
We do get a record of all investors from Startengine and their amounts and that information is on file with our lawyers and accountants. Your payment was to Startengine so they have the proof of purchase.

For More Information

Ansys Cross Section

Grid-tied Small Turbines

Finding the Price of Electricity 

How Many Turbines will Power a House?

Information on Wind and Wind Turbines

How to Measure Your Wind

Planning Wind and Solar Together

Why do you want to buy a turbine?

What makes Flower Turbines special?

Technology Background

Take Action

Join the Movement Against Climate Change


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