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Forum Index : Windmills : How do I get higher amps.

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joyt12k

Regular Member

Joined: 12/05/2009
Location: Australia
Posts: 49

Posted: 09:49am 30 Aug 2010

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Hi everyone, I have finally got my F&P up and going and feeding into the grid.
The setup consists of a bridge rectifier a 24v regulator/charge controller, a low voltage device 2x12v batteries and a powerjack 600watt.
The powerjack draws 18amps at 24volts from the battery bank, and puts out 240v at 1.5amps about 360watts. The LVD switches off when the batteries drop below 24.4v for 10 sec's and switches back in when the voltage goes up to 26v for 10sec's.This saves my batteries from going flat.
I do have a problem with the F&P stator, I have a 2x7C which gives 24v very easily
at 60RPM however only 1amp, this was mesured while turning the mill by hand (the wind was'nt blowing this weekend)The other stator is wired for 12v however, turning by hand again I'm getting 12v but it's not enough to charge the batteries.
So does anyone know why I'm getting very low amps? Is it lack of RPM's? Or am I
measuring it in the wrong place? I'm measuring the positive between the bridge rectifier and the charge controller. Any advice would be appreciated.

jasmine

Downwind

Guru

Joined: 09/09/2009
Location: Australia
Posts: 2333

Posted: 10:36am 30 Aug 2010

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At 60 rpm i am suprised you get that much power.

You need to be around 200 rpm or above to produce reasonable power.

See what happens when the wind has a decent blow.

Pete.

Sometimes it just works

imsmooth

Senior Member

Joined: 07/02/2008
Location: United States
Posts: 214

Posted: 12:26pm 30 Aug 2010

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If you look at the bottom of this page you can see the result I had with my F&P

power chart

You can double the stator/rotors; you can do what I did and replace the magnets with neos. This will increase your potential power. As mentioned above, in order to get this power you need higher RPMs, which means more wind.

Edited by imsmooth 2010-08-31

joyt12k

Regular Member

Joined: 12/05/2009
Location: Australia
Posts: 49

Posted: 12:28pm 31 Aug 2010

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I have just been reading about your project (power chart)and it's very interesting
you must have spent hours on this project. You don't show how you changed the magnets. I would like to know where you bought them? how many? and what size?
I did originally start this project to make use of the strong easterlies we get from November to March, but would be nice to be able to get some power from everyday winds.

jasmine

imsmooth

Senior Member

Joined: 07/02/2008
Location: United States
Posts: 214

Posted: 06:56pm 31 Aug 2010

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I do show how I changed the magnets. Go to the beginning at

wind turbine project tutorial

joyt12k

Regular Member

Joined: 12/05/2009
Location: Australia
Posts: 49

Posted: 10:21am 01 Sep 2010

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Thanks I have just had a look, don't know how I missed it.
I've twisted my poles so the magnets can be straight, just going to have a look for some on ebay, $75 for postage sounds a bit pricy.

jasmine

joyt12k

Regular Member

Joined: 12/05/2009
Location: Australia
Posts: 49

Posted: 12:08pm 01 Sep 2010

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I've just found some N42 on a U/K site on ebay, 25X10X3 $42.00 for 60 plus postage,waiting to find out how much. Because my poles are twisted and rounded I have virtually no cogging, do you think the stronger magnets will bring back the cogging?

jasmine

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