ReDriven 20kW Wind Turbine Hot

ReDriven 20kW Wind Turbine

According to the manufacturer;

The ReDriven 20 kW unit is one of our most popular wind turbine systems. The 20 kW boasts start up wind speeds of 4.4 mph (2.0 meters per second) and produces 20,000 watts per hour at approximately 22 mph (11 m/s). The advanced controller system allows for remote access to monitor power output as well as start and stop the system from anywhere in the world.

Wind turbines

Swept area

The ReDriven 20kW has a blade diameter of 12.00 metres. This means it has a swept area, or capture area of 113.1 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.

ReDriven 20kW power output curve

The graph below shows the power produced (in watts) for the ReDriven 20kW 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 ReDriven 20kW is extracting 2700 Watts of power from the wind, which is an efficiency of 31.05%.

If you want to install a wind turbine, it is very important to measure how much energy you might produce.
Learn more about the Power Predictor


How efficient is the ReDriven 20kW?

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 ReDriven 20kW turbine, working out annual power production is more complex.

Read more about the Power Predictor

Cost
Price quoted from the company website is $42,737.62.
Blade diameter
12.00 metres
Rated output (W)
20000
Warranty
5 year warranty on everything… Blades, controllers, turbine head, etc.
Voltages
240 Volt AC
Manufacturer
ReDriven
Noise levels
Sound at 70 feet: 59 dBA
Country of origin
USA
Generator type
Permanent magnet
Governing wind speed (m/s)
12
Governing system
Dynamic brake
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Comments (5)Add Comment
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written by Bill Vala, August 05, 2012
I am located near Springfield, IL and am just one of many with a Redriven 20kw system that never worked.
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written by Jerry, April 30, 2011
If you want the truth about ReDriven turbines email me.

jtp1@frontiernet.net

We purchased a ReDriven 20KW unit almost 3 years ago. It has yet to function or produce any meaningful power. THIS TURBINE IS AN ABSOLUTE PIECE OF SH*T!!

ReDriven is refusing to repair or replace as mandated by the state of California. They won't even respond to my emails or phone calls.

We have filed a calim with the BBB. BBB closed the case as "unresolved" and gave ReDriven a D+ rating. ReDriven does not seem to care.

There are MANY other customers with my experience or worse.

BUYER BEWARE OF THIS SHADY COMPANY!!!!!
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written by Ellen, April 09, 2011
See my real life experience with a 10kw Redriven wind turbine on my blog http://smallwindy.blogspot.com/
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written by Better Generation, January 08, 2010
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written by scottj@chico.com, January 06, 2010
I have sold 17 of these turbines. They consistantly have major problems and do not work. The manufacturer is one company I would NEVER again buy from. smilies/sad.gif

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