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23rd Jan 2022 Login  
Bergey Excel 10kW turbine - advice
by Peter at 2007-04-05 20:38:33 (Blog::Peter)
In November 2006 we installed a Bergey Excel 10 kW grid-intertied system for domestic use on a 24m. guyed latticed tower. In the first four months of operation the system has generated 6,900 kWh (we would expect these winter months to be the most productive).
1. We have a good site, just outside the NYM National Park. Before submitting a planning application we sought the views of neighbours and our local Parish Council. National Parks, SSSI, Hambleton DC (Agenda 21) were all involved in the Planning Application. The (planning) process took around 4 months and was all undertaken 'on-line'. Although the site is some distance from any other homes, it is very exposed and is in clear view of the village. Fortunately, our neighbours (without exception) have been very supportive. The total time taken from 1st evaluation to 'switch-on' was a little over 12 months.

2. Our prevailing wind direction is from the south & west. The DTI wind database indicates annual average windspeed around 5.6 m/s @ 10m agl, which was then validated against other local sources.

3. We looked at a number of possible solutions and gave serious consideration to the Proven 6kW & Bergey 10kW turbines, before electing to go with the Bergey. The Bergey Excel is a 6.7 meter (22 ft) diameter three-blade upwind turbine which (we hope) will achieve high reliability through rugged construction. It has only 3 moving parts. Further information on the Bergey turbine we installed can be found here.

4. Our cable run to the inverter is quite long (just over 300m, requiring 3x core 35mm˛ armoured cable (XLPE/PVC/SWA/PVC).

5. So far we have experienced no down-time and the turbine has been usefully generating around 85% of the time. At current prices we would anticipate payback in around 8 years.

For the statistically minded and for what it's worth, we worked with the following estimates (which - so far - seem to have been reasonable).

Spreadsheet inputs:
Weibull K = 2
Site Altitude (m) = 120
Wind Shear Exp. = 0.143
Anem. Height (m) = 10
Tower Height (m) = 24
Turbulence Factor = 10.0%

Spreadsheet results:
Hub Average Wind Speed (m/s) = 6.35
Air Density Factor = -1%
Average Output Power (kW) = 2.26
Daily Energy Output (kWh) = 54.1
Annual Energy Output (kWh) = 19,763
Monthly Energy Output = 1,647
Percent Operating Time = 78.6%

I hope this is useful. I will expand this blog from time with my experience of the Bergey turbine - click here for updates.

___________________________

Peter

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