Swept area
The Evoco 10 has a blade diameter of 9.60 metres. This means it has a swept area, or capture area of 72.38 square metres. This is all important when comparing wind turbines, since it directly relates to the amount of passing wind energy
the turbine blades can intercept.
Evoco 10 power output curve
The graph below shows the power produced (in watts) for the Evoco 10 at different wind speeds, based on
data supplied by the manufacturer.
The green line shows the actual output that the wind turbine achieves at the given wind speed,
according to the manufacturers.The dashed line in the graph shows the theoretical maximum energy that this turbine could extract from the wind,
according to Betz's Law (59.3%). At a typical wind speed of
5 m/s, the Evoco 10 is extracting
1546 Watts of power from the wind, which is an efficiency of
27.78%.
How efficient is the Evoco 10?
Wind turbines can only convert some of the energy in the wind into electricity. The graph here shows how efficient the
turbine is across the range of wind speeds you might get.
The orange line in the above graph shows the efficiency ranging from 0 to 1. The grey line is the previously mentioned maximum efficiency - The Betz Limit. If this limit is exceeded, the manufacturer's claims are not to be trusted!
While these graphs give an indication of the instantaneous power and efficiencies you might expect from the
Evoco 10 turbine, working out annual power production is more complex.
Read more about the
Power PredictorMCS Certification
The Evoco 10 has achieved MCS (Microgeneration Certification Scheme) accreditation.
This means that this turbine's performance has been independently verified and any new installations of this device will be eligible to benefit from the UK's feed-in-tariff (FiT) scheme.
Manufacturer-supplied data suggests up to 40,000 kwh per annum depending on mean wind and siting. (28,500 at 6m/s in an unobstructed rural location). This is enough for up to 12 average homes.
The turbine itself costs from £29,000 to £31,000 + VAT depending on the tower height. Guideline installation price is £6,000 + VAT.
The manufacturer claims that it produces less than 54dB at 60m and 5m/s.
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I am a believer that when spending this amount of money and especially if its made abroad and more especially if Chinese the im gonna wait a real good long trial period before im going to commit myself. The build quality of my Westwind is amazing and i support their claim of 25 years service life having seen the guts of it working. Although i too have had a few niggly problems with it , they were quickly ironed out by my accredited installer natural generation of St Agnes Cornwall. Evoco have not yet even answered a quirey i had on their turbine Ben Harrison ) so again on that alone i excercise caution before such a massive commitment !
Ian Holding ( Bodmin Cornwall )