Swept area
The Navitron 200W has a blade diameter of 2.00 metres. This means it has a swept area, or capture area of 3.14 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.
Navitron 200W power output curve
The graph below shows the power produced (in watts) for the Navitron 200W 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 Navitron 200W is extracting
125 Watts of power from the wind, which is an efficiency of
51.76%.
How efficient is the Navitron 200W?
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
Navitron 200W turbine, working out annual power production is more complex.
Read more about the
Power Predictor
No output data is available for wind speeds about 13m/s, so we are assuming no output (although this may not be the case)
Price starts at £299 for a package including tower, guylines and anchors, inverter, controller and blades.
Extra requirements include cement for foundations and batteries to complete the installation. Looks like it can be a DIY installation.
Anecdotal evidence of noisy operation, but this may be due to poorly balanced blades.
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