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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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1answer
131 views

Are crypto currencies sustainable?

Except generating a different kind of "money value", what is the sustainable value of crypto currencies compared to the energy consumed to generate them? Compared to currencies working with ...
4
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2answers
39 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 ...
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4answers
172 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 ...
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1answer
103 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 ...
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1answer
107 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 ...
3
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1answer
81 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 ...
5
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1answer
117 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
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1answer
96 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 ...
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1answer
55 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 ...
4
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1answer
217 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?
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0answers
19 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
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0answers
44 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 ...
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0answers
81 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 ...
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2answers
74 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 ...
4
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1answer
765 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 ...
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2answers
269 views

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

This is my first post so hello to everyone on here! 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 ...
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0answers
43 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 ...
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2answers
553 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 ...
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1answer
200 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 ...
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1answer
5k 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 ...
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2answers
298 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 ...
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2answers
521 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) ...
6
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1answer
68 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 ...
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1answer
173 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: ...
6
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1answer
498 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-...
8
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2answers
119 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 ...
3
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1answer
121 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 ...
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2answers
646 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 ...
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2answers
345 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 ...
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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 ...
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3answers
196 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 ...