Friday, September 24, 2004

Africa: Alternative Energy Kenya: Wind Micropower


Approtec's Xtrabike project in Kenya in Collaboration with XAccess

AllAfrica.com reports that Kenyan duo Philip Osula and Mwacharo Guyo have installed wind-powered electricity generators in various homes in Nairobi, Mandera, Olengurueni and Taita in the last three years.

A beneficiary of the technology, Jeff Odera, a research scientist living in Nairobi, says he has found the technology reliable and cheaper than using a diesel generator. "It is silent, has less maintenance cost, is reliable, and no fuel is used," says Odera.

Converted to the technology two years ago, Odera says it has served his household well. "I use it for lighting and other household appliances like fridge, computer, television, and radio among others."

Using a simple dynamo-like appliance, the technicians coil a coated wire around a revolving magnet, which induces an alternating current into the wires once it starts rotating. "We make the turbines using waste material which includes wood and fibreglass, which makes them light for easy rotation by wind," explains Osula.

"To maintain continuous current flow, the cables are connected to a bank of batteries which stores any extra power in form of direct current. It is then connected to an inverter which steps it up and transforms it back to alternating current to be used in times of low or no wind, explains Osula.

"The power needed in the rural homesteads is little, thus one generator could serve 10 households according to our research," he says.



With an average annual income of under US $400 it is estimated that 75 percent of citizens of this East African nation have no access to grid electricity due to high connectivity cost, the subsequent bills and maintenance costs.

An average generator dubbed 'wind cruiser' ranges in weight from 15 to 25 kilos (around 33lbs-55lbs), is 10 inches in diameter and has a tail which gets the optimum direction of the wind. It is able to produce three kilowatts of electric energy.

All Africa article on the use of Micro Wind Power in Kenya

4 Comments:

Blogger Steve Spence said...

A 10" diameter wind generator cannot produce 3kw. A 3' diameter machine is hard pressed to generate 400 watts. Somebody has their facts messed up.

7:50 am, September 28, 2004  
Anonymous Anonymous said...

Given that this modern unit, the Air 403 From Southwest WindPower has a rotor of about 4 feet in diameter, and produces 400 watts with a 28 mph wind, these lower-tech Kenyan rotors, if they are producing 400 watts, are likely at least 6 to 8 feet in diameter. I'd be curious to know their diameter.

http://www.solarenergy-alt.com/windgenerators.htm

Mark Aalfs

10:41 pm, September 28, 2004  
Blogger Barak said...

This article has pictures and more info.

http://www.islamonline.net/english/science/2004/07/article06.shtml

The largest wingspan is up to 10' and they produce 1800W.

This is the company that manufactures the things.

http://www.craftskills.biz

12:11 am, October 07, 2004  
Anonymous sabouha said...

my first day in this blog and I love it already! for the sake of getting informed and updated on renewable energy technologies (RET)globally. Keep it up Alternative Energy bloggers!

4:10 am, July 29, 2006  

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