Understanding Domestic Wind Power

Domestic wind power is another renewable energy technology which is gaining popularity. Different systems run in slightly different ways, but the most common systems run like this.

 

Domestic Wind Turbine

Electricity is generated by the wind turbine. The electricity from it smoothed out by a piece switch gear, and then sent to the main fuse board. The idea behind smaller (and most common) domestic wind turbines is that will displace your “base load” electricity. That is to say the electricity it generates (75-250W) is less than the minimum amount of electricity your house is using. So at all times you will consume all of the electricity it is making, and so none will ever escape out onto the national grid. This is good because the value of the electricity you buy is quite high (probably 16c or so) while the value of electricity supplied to the market is quite low (about 6c).

 

Domestic Wind System

Batteries

Some systems use batteries to store electricity for use at peak times, but batteries are expensive and bulky, and adding them to a system adds to inefficiency by a good bit. The bulk of this inefficiency comes from converting the electricity to DC, for storage, and then back to AC, for use in your house (see the inverter bit below).

Turbine blades

The 3 blade wind turbine we see most commonly has been chosen due to a bit of physics showing that it takes the most energy out of the wind possible. Older turbines which have more blades have since been proven to be less effective over a range of wind speeds. The essence of the thing is that trying to block the wind is the wrong way to go about it, the best solution is to “catch” the wind, and be dragged along by it. Hence 3 blades, and also the particular pitch (angle) they are set at. In very large turbines the blades can be adjusted to be at the optimal pitch, but that would be overkill for smaller turbines.

Gearboxes

Some more expensive turbines use gearboxes to optimise the energy being extracted from the wind, working no different to the gears on your bike. Cheaper and smaller ones often don’t bother with this however as it adds to the cost and provides more things to break.

Generator/Alternator

Generators and alternators produce electricity from the rotation of the turbine motor. A generator produces Direct Current (DC) power while an alternator produces Alternating Current(AC) power.

Invertors

In systems where batteries are included, inverters are added. Inverters are pieces of equipment that turn electricity from D/C (like in batteries) to A/C (like grid electricity).

Yaw

Yaw systems are used to align the turbine to the proper angle of the wind. Most domestic wind systems use a simple tail vane to do this.

 

 

But do they work

Well first, you must accept a fact about the wind… it is not always there. So once we’re got that out of the way… then yes… they do.

Because wind is an intermittent resource, you can’t expect it to supply all your electricity needs. The idea with wind is that it will generate electricity when it is windy, and when it is calm, you’ll need to use another energy source. So if you buy a wind turbine, and see that it is rated to generate 100W, then you can hope to get an average 33W from it. If it is rated to 750W, then you’ll get an average of 250W. Average does mean average though… So it might be generating 0W, or might be generating 600W, or any variation.

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21 Responses to Understanding Domestic Wind Power

  1. Then Ewoil says:

    Nice clear outline of domestic wind generators – wqell done!. Did you produce your own schematic graphic?

    Just to add that there are some nice ideas in Vertical Axis Turbines starting to come on the market. These have a couple of advantages, a. It does not matter which direction the wind blows, b. Much quieter. c Less affected by high winds. As yet though there has not emerged a really reliable design.

    Cheers,
    Tony McGinley

  2. [...] Domestic Wind Power: Wind power is a good option for Ireland. Payback (time when savings pay back the cost) is in the region of 10 years or so, which isn’t really great… considering they don’t last forever… Issues with them are safety of installation. So them actually falling down… And the electrical side… them killing you or an electrician… [...]

  3. Jan Combrinck says:

    cAN WIND ELECTRICITY REPLACE MY COMPLETE HOME USAGE? We have wind in abundance. Very big house. 5 Bedrooms, 3 lounges, 3 bathrooms 2 geazers, 3 stoves and plugs x 2 per room.

  4. [...] together to offer an export tariff to domestic home owners. So the idea is that if you install a Wind turbine, a Solar PV panel, or a Micro-CHP, you will be in a position to sell electricity to back to the [...]

  5. shureaums says:

    Interesting information, i will definitely visit again!!

  6. Did you just decide to go green and begin to generate your own power? Or at least try to? You are like many other people, today people want to help out the environment and save as much of its precious resources as possible.

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  8. teddy upjohn says:

    Thanks for that post and thanks also to go green and clean energy. There are essentially 4 main things you need to know about Wind Power Energy: How to setup your system properly. How to maintain your current system or the one you will build How to cure problems with your system How to keep your system working like NEW over the years ”WindPoweCost.org” covers all of this, and a lot more. And when you read it, you’ll be BLOWN AWAY with how simple it really is to build and maintain.

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  10. WindTurbine says:

    I understand that the generator is the most important part of your wind power system. In fact you can say that the generator can decide the efficiency of the turbine and is the key to success. Can you elaborate more on this?
    Thank you for your interesting post.

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  13. Let’s not forget that you need a lot of wind to get any worthwhile energy out of any wind turbine. if you visit a wind farm it feels very windy even when the blades are turning quite slowly.

    Maybe the answer is microgeneration and diy wind turbines? There are plenty of plans out there however it is always difficult to know how good the plan is that you may buy – price is not always a good indicator…

    The best thing is to get hold of a few plans – maybe free ones – and then start to think about what type of generator you want to build. I also prefer VAWT plans because I can build them and modify them. Maybe a simple Vertical Axis model first and then you can always build a higher efficiency model. In my view build simple first and get some power then develop and build more.. Here is a link to a site with lots of plans available some are free so worth downloading just to see the scope of a project.

    http://www.onetoremember.co.uk/xcart/wind.html

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