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Date: Wed, 12 Jun 2013 09:38:17 +0100
From: g3zjo <g3zjo@psk31.plus.com>
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To: rsgb_lf_group@blacksheep.org
References: <9A6FD89658AF451890E8709A003D5B7A@malHP>	<51B73B97.7010100@iup.uni-heidelberg.de> <CAMFjj72L5T7C4hW=NVyOuuDFM9JB34g7v+Ps+kQD1s58RxQmjA@mail.gmail.com> <51B77A4B.9020008@iup.uni-heidelberg.de> <86AD6A9E30DC4F3CA71C2117945A21BA@White>
In-Reply-To: <86AD6A9E30DC4F3CA71C2117945A21BA@White>
Subject: Re: LF: DIY WIND GENERATOR
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On 11/06/2013 23:02, Markus Vester wrote:
> The plan is to have the ebike pull myself and the equipment onto some 
> hilltop. Then mount wind blades onto the front wheel, and get the kite 
> up for a three-hour VLF dash while topping up the battery on the side. 
> Then roll downhill and come home with the fully charged battery ready 
> for tomorrow ;-) 

Marcus / LF

A beautiful concept. Hardly marketable though. "With our ACME system you 
can can out (only on windy days) preferably up a hill, and return using 
free energy".:-)

The wind is a fickle beast. We did 6 Months touring France using only 
wind energy for electricity (some lowlife stole the solar panel early 
on) we were becalmed in the Vercors mountains when we had to stay put, 
so no charging from the engine. The sun was relentless and started 
forest fires. In the last week of the tour there were gales, screaming 
generator, fully charged batteries and 20 Amps to dump day in day out.

> Wondering about Eddies remark on the rpm mismatch between propeller 
> and alternator - what would be the optimum frequency range for either 
> side? I

Yes, Christian also noted the apparent lack of gearing. With the use of 
a car alternator which was not designed for the job it is very difficult 
to get efficiency. All alternators have a 'cut in speed', horrible term, 
in RPM, which in wind generators is stated in wind sped (knots).
My 20Amp Wind Generator has a cut in speed of 8 knots, its rated at 
20Amps but you have got to have a 60 knot wind to reach that.

It is definitely not as easy as putting a fan on the shaft of a car 
alternator to produce a "HOME BREW WIND GENERATOR 12V/100A"

73 Eddie G3ZJO



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    On 11/06/2013 23:02, Markus Vester wrote:
    <blockquote cite="mid:86AD6A9E30DC4F3CA71C2117945A21BA@White"
      type="cite"><font face="Arial" size="2">The plan is&nbsp;to have the
        ebike pull&nbsp;myself and the equipment onto&nbsp;some hilltop. Then
        mount wind blades onto the front wheel,&nbsp;and get the kite up for
        a&nbsp;three-hour VLF dash while&nbsp;topping up&nbsp;the battery on the side.
        Then roll downhill and come home with the&nbsp;fully charged&nbsp;battery
        ready for tomorrow ;-) </font></blockquote>
    <br>
    Marcus / LF<br>
    <br>
    A beautiful concept. Hardly marketable though. "With our ACME system
    you can can out (only on windy days) preferably up a hill, and
    return using free energy".<span class="moz-smiley-s1"><span> :-) </span></span><br>
    <br>
    The wind is a fickle beast. We did 6 Months touring France using
    only wind energy for electricity (some lowlife stole the solar panel
    early on) we were becalmed in the Vercors mountains when we had to
    stay put, so no charging from the engine. The sun was relentless and
    started forest fires. In the last week of the tour there were gales,
    screaming generator, fully charged batteries and 20 Amps to dump day
    in day out.<br>
    <br>
    <blockquote type="cite"><font face="Arial" size="2">Wondering about
        Eddies remark on the rpm mismatch between propeller
        and&nbsp;alternator - what would&nbsp;be the optimum frequency range for
        either side? I</font></blockquote>
    <br>
    Yes, Christian also noted the apparent lack of gearing. With the use
    of a car alternator which was not designed for the job it is very
    difficult to get efficiency. All alternators have a 'cut in speed',
    horrible term, in RPM, which in wind generators is stated in wind
    sped (knots).<br>
    My 20Amp Wind Generator has a cut in speed of 8 knots, its rated at
    20Amps but you have got to have a 60 knot wind to reach that.<br>
    <br>
    It is definitely not as easy as putting a fan on the shaft of a car
    alternator to produce a "HOME BREW WIND GENERATOR 12V/100A"<br>
    <br>
    73 Eddie G3ZJO<br>
    <br>
    <br>
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