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Need some advise please

PostPosted: Tue Apr 23, 2013 8:55 am
by Jay
I built a wind turbine a couple of years ago but the voltage produce was only 11 volts so never did anything with it. tried with only 2 blades and got the rpm up but my furling was not good so the blades ripped off, now I'm thinking of using smoothing capacitors to increase voltage and stop any surges from gusts, my question is this.

Has anyone use capacitors in this way and got results, if so please could you post the schematic of the size of capacitors used and how they were wired. Also would like to know if I should turn the turbine in a down wind type, with out the furling tail.

Re: Need some advise please

PostPosted: Wed May 15, 2013 7:00 pm
by windgat
Hi Jay, looks great! You can't use capacitors alone to increase voltage. You can make a circuit using a coil, a FET, and capacitor, which is called a DC boost converter. Or you can try increase the rpm to get more voltage. Once you get 13.5 voltage you are good to charge a 12V battery.

What generator are you using? Your problem is typically of projects which use a car alternator or other high rpm motor as a generator.

To make it turn downwind, try reversing the blades, and removing the tail - that alone might do it.

Re: Need some advise please

PostPosted: Tue May 21, 2013 8:56 pm
by Jay
Hi Windgat, thanks for your reply.

I did try to increase rpm by only using 2 blades instead of three, it worked too well the centrifugal force tore of one of the blades and it end stuck in a tree.

I'm using a treadmill motor I bought from a friend for 800 bucks, it's rated 8000 rpm and 240vdc I was considering trying to have it rewound but figured boosting voltage cheaper.

Thanks again for advise


Re: Need some advise please

PostPosted: Mon Mar 17, 2014 12:11 pm
by windgat
Another option for you is to build (or buy) a DC-DC boost converter. This can, for e.g. double the DC voltage, thereby halving the RPM required before the 12V battery starts to charge.

There will be some conversion loss, but these DC converters can be very efficient, i.e. over 90%.