Questions tagged [wind-power]

The conversion of the kinetic energy from moving air into usable electrical energy. This is almost always through three-blade horizontal-axis wind turbines, though there are variants that include two blades, or a vertical axis.

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15
votes
3answers
213 views

How can I determine whether roof top wind turbines would be beneficial in my area?

Rooftop wind turbines seem great in principle, but in practice, especially in urban areas their usefulness and efficiency is debated, such as in this article. The most general consensus seems to be ...
12
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1answer
6k views

Which types of spare electric motors from common consumer appliances are suitable to repurpose as generators?

I've heard that washing machine motors (in particular, the Fisher & Paykel branded ones which are local to me in New Zealand) are quite suitable for repurposing for generation use. Other types ...
11
votes
1answer
3k views

Trickle-charging batteries for outdoor usage/ wind turbine suggestions

I have a Shimano Hub Dynamo wheel from an old bike, I intend on turning into a small wind-turbine, probably starting off like this but being modded further when I have the time. My modest aim is to ...
9
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2answers
670 views

Wind turbine vs. solar panel or both?

I am looking for a solution to replace a broken electricity generator. I am considering using solar panels or a wind turbine. Or even both. I need it for an animal shed and the targeted consumption ...
9
votes
2answers
139 views

How can electricity grids successfully incorporate high (50%+) penetrations of PV and wind?

Although most of the renewable energy currently consumed by the world can be turned on and off at will pretty easily (hydro and biomass), there are two potentially huge supplies, wind and PV, that are ...
7
votes
2answers
375 views

At what point are home windmills sustainable?

Do home windmills have a 'prove in' curve for sustainability like they do for economics? I presume they are sustainable sooner than the point where they are economical, but couldn't find anything on ...
7
votes
2answers
307 views

How can people afford to be self-sufficient and sustainable?

One thing I constantly battle with is money and affording to be more self-sufficient. Don't get me wrong – I earn good money, I have managed finances and a few debts but this post isn't really about ...
7
votes
1answer
105 views

How to attach more sources of energy to your charge controller

Lets say I have an existing solar power system. If I want to add a wind turbine or I get more solar panels, is it as easy as just attaching the new sources of energy to my charge controller (in ...
7
votes
1answer
63 views

How are readings from the wind sensors mounted on wind turbines influenced by the blades' wakes?

Utility-scale wind turbines have various sensors mounted on the nacelle, to ensure the power generation is optimised. How are readings from the wind sensors mounted on wind turbines influenced by the ...
7
votes
2answers
674 views

What are the physical limits on wind turbine size?

Wind turbines just seem to keep growing. Predictions a few years ago that a 120-metre diameter rotor was going to be the maximum, have turned out to be wrong, and 154-metre rotors are being installed ...
6
votes
1answer
274 views

What is the number 1 country by global installed wind capacity: the United States or China?

In the following graph: We see that China surpassed every single country in wind energy production, except the United States. But these statistics are up to 2009 only. So my question is: what about ...
6
votes
1answer
70 views

How quickly can the offshore-turbine supply chain expand?

To date, there were until recently just a few players in the manufacture of multi-megawatt scale offshore-wind turbines, though with the entrance of new Chinese manufacturers, that's been expanding ...
6
votes
1answer
664 views

How long does it take to construct a new port suitable for offshore wind construction?

How long does it take to construct a new port suitable for offshore wind construction? I'm thinking about the whole period: the design and planning, construction, and commissioning? I'd value real-...
5
votes
1answer
70 views

Is electricity used at night more likely to be renewable?

Discussing charging my electric car with a colleague recently I argued that since (in Ireland) our renewable energy sources are mainly wind and hydro, since I charge my car at night the mixture of ...
5
votes
2answers
653 views

What is investment/outcome ratio for wind energy in terms of energy (EROEI)?

Merchants say that I can have 1 watt of energy per every $1.5 invested. Yet, I have heard from people "from the business" that the installation alone (forget mining the ores and smelting the parts) ...
5
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0answers
24 views

Which part of the process of estimating wind resource has the potential greatest benefit from further research?

Estimations of the potential generation resource of wind power happens at all scales from very coarse global estimates, to detailed estimates at individual sites based on specific locations and ...
4
votes
1answer
1k views

What is the scrap value of wind renewables?

What is the scrap value of the materials in a typical wind turbine - the entire unit? Take a typical 1.5 MW turbine, just the raw material value, no labor or overhead cost. As I understand high ...
4
votes
2answers
88 views

How many square kilometres of offshore wind farms would be required to replace the closing of a 4GW nuclear power station

A large nuclear power plant has a capacity of 4GW and a capacity factor of about 90%. How much installed capacity of wind turbines with a capacity factor of 40% would be required to match that output?...
4
votes
2answers
45 views

Is there a simple on-line tool for estimating wind turbine power output?

The back-and-forth in the comments on this answer sent me searching for a simple tool that would enable a user to put in a location, wind turbine size, and a few other parameters, in order to estimate ...
4
votes
1answer
121 views

Apply solar energy solutions at our apartment?

I know this will probably get closed, but it seems that I can't find anything that will guide me in the right direction. We live in a South American country, so we have tons on sun. We also have a ...
4
votes
1answer
374 views

What does the P90 of a wind resource mean?

I've heard that investors use the P90 of a wind resource when considering an investment. What kind of measure is it, what does it actually mean, and how is it calculated?
4
votes
2answers
366 views

What was the repowering programme that caused a spike in Danish turbine decommissioning in 2002?

This pdf on Danish Renewable Energy Policy by Preben Maegaard refers on page 11 to A repowering programme that had been launched by the previous government resulted in a short term revitalisation ...
4
votes
1answer
77 views

Is there a recent study that shows how accurate wind turbine wake models are?

Wind-turbine wake models are used in the design of wind farms, to optimise the choice of turbine model, and the layout of the turbines. They're also sometimes used in the operation of wind farms, to ...
4
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0answers
129 views

What are the advantages and disadvantages of using lidars over sodars for wind resource assessment?

The process of wind resource assessment has used a variety of methods over the years; more recently, lidar - radar-style sensing using lasers; and sodar (similar, but using sound) have come to ...
3
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4answers
255 views

Are trees more productive than wind turbines?

Tree farm assumptions: 250,000 square meters (m2) tree farm A 1 ton tree contains 1 MWh of energy Each tree takes 10 m2 of space Total energy for this farm is thus 25 GWh Wind farm assumptions: 5 ...
3
votes
2answers
83 views

How to log wind statistics data

How can I log data from anemometers? Are there any anemometers with ability to log data for long periods of time? I want to collect data for about a year or two. What are the options? Which will be ...
3
votes
1answer
47 views

With current technology, how much CO2 is emitted when making renewable power plants?

In order to make a solar panel or a wind turbine, a few basic inputs are required: labor energy water raw materials Given the current abundance of renewable resources, I assume that the first three ...
3
votes
1answer
100 views

What is a good database containing wind speed and direction?

I am pursuing a science project involving wind power, and am looking for some data on wind speeds, directions, and ideally turbulence and shear. Do you know where I could find this? I would need to ...
3
votes
1answer
123 views

What are the biggest supply-side logistical constraints on the expansion of offshore wind?

Offshore wind is a booming industry, and in particular the UK has an enormous theoretical potential to generate 2TW mean power from offshore wind, as I wrote on my blog. And whereas there's a lot of ...
2
votes
1answer
248 views

What is the wind wake effect and why is important for wind turbines?

I was reading about wake models. However it is unclear to me how they are used to model wind turbines. Could anybody explain me what are wake models and why it is important to predict wakes in wind ...
2
votes
1answer
186 views

How many vessels does it take to build an offshore wind farm?

How many vessel-days does it take to build an offshore wind farm, per turbine or per megawatt? I notice that when an offshore wind farm is being built, there are quite a few vessels milling around: ...
2
votes
1answer
103 views

Solar water-pump working continuously

I want to install a solar water-pump or a windmill water pump to extract water from an aquifer without stop during the day (constant flow). The solar water-pump is less expensive and comes with the ...
2
votes
0answers
48 views

How to make a controlled discharge of batteries connected to the grid? [closed]

I currently have 1600 W wind turbine with grid tie inverters of 12-24 volt 1600 W and I now want to add batteries to my system with a controlled discharge, Adjustable from 10-20 amps without ...
1
vote
1answer
126 views

Is it possible to harvest energy from the storm?

My idea of a device for harvesting energy from wind If used in reality, this device will harvest significant amounts of energy from wind, waves and storms. This not only solved the problem of energy ...
0
votes
1answer
133 views

Is it possible to reverse the air flow of a roof turbine/whirlybird?

I am currently working on a device that requires omnidirectional air currents (e.g. breezes/winds) to be directed downwards through a vertical tube. I think it would be a very similar design to a ...
-1
votes
3answers
136 views

Is wind power practically dead?

U.S. annual installations have been declining since 2012. Essentially everywhere else, besides China's low quality wind, there's only a handful of new farms being built. Is wind pretty much dead?
-2
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1answer
100 views

Why does wind just track the economy

Whenever oil booms, wind booms too. Whenever oil production crashes wind crashes too. The US added about 5GW or 2 million barrels of oil equivalent this year of wind and 300 million barrels of oil in ...