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Forum Index : Windmills : How to calculate the annual (kWh) output
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| Wes Lemarr Newbie  Joined: 07/09/2008 Location: United StatesPosts: 35 |
Hi Guys I found this chart on the internet, do you think that this is a reasonably accrete indicator of the output of a wind generator? Thanks Wes LeMarr 
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Tinker Guru  Joined: 07/11/2007 Location: AustraliaPosts: 1904 |
Maybe, if the wind blows very consistently 24/365. It rarely does  Klaus |
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| Wes Lemarr Newbie Joined: 07/09/2008 Location: United StatesPosts: 35 |
Klaus, Hear is another http://www.reuk.co.uk/Calculate-kWh-Generated-by-Wind-Turbin e.htm This Calculator takes the "Weibull Shape Parameter" in to consideration, maybe it is more accurate? Wes |
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| Wes Lemarr Newbie Joined: 07/09/2008 Location: United StatesPosts: 35 |
Sorry bad link. http://www.reuk.co.uk/Calculate-kWh-Generated-by-Wind-Turbin  e.htm
Thear should not be a space between "Turbin" & the "e" in the link above. |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
http://www.reuk.co.uk/Calculate-kWh-Generated-by-Wind-Turbin e.htm The top table is not much use. We dont know the turbine efficiency or alternator efficiency. Is the wind speed a average? I would ignore it. The link is better, but unless you know the values to enter, its also not much use either. What is the turbine/alternator efficiency? The only way to get a figure is through testing in real conditions. Measure the power output at different wind speeds, and make your own table of data with the values. Then record windspeed for a few days/weeks to build up a table of average windspeed data. Unfortunately many small commercial wind turbines are overrated by the manufacturer, based on a couple of simple tests performed on the bench. Too often we hear of someone who bought a turbine rated at say, 300 watts, but after spending their money and investing time putting the turbine up on a mast, they find they average 50 watts, and only see 300 watts during a storm, just before it failed! This has lead to a general misstrust of the small wind turbine industry. There are good turbines out there, but only because the manufacturer has invested a lot of time into their reliability and provide realistic figures. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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