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A bunch of little Gennys


By Norm, Section Homebrewed Electricity
Posted on Fri Sep 23, 2005 at 07:40:48 PM MST
I was just looking at a neighbors yard all those whirlygigs

...they must have about 2 dozen or so....just
doing nothing but spinning....
   Would it be possible (and simple to do)?
....Make a bunch of small alternators accumulate
a 30volt charge or higher
 into a capacitor on each of about a dozen VAWTs and zap the charge over to a centrally located 12volt battery?
                       ( :>) Norm.

 

A bunch of little Gennys | 7 comments (7 topical)

Re: A bunch of little Gennys (3.00 / 0) (#1)
by ghurd on Fri Sep 23, 2005 at 04:58:54 PM MST

Why not?
Like 10 5V stepper motors,
each feeding a capacitor,
with all the caps in series.
That would probably just feed
amps as they are made,
not 'Zap' the battery.

Decent amps from a stepper
is less problem than decent volts.
For what I've done at least.

G-
Ghurd.info



Re: A bunch of little Gennys (3.00 / 0) (#2)
by MountainMan on Fri Sep 23, 2005 at 07:44:03 PM MST

Hmmmn, before we get too excited about making a real alternative energy source from our field of whirligigs, remember that the power from a wind genny is a function of the area - or for a HAWT, a function of the radius squared.

Let's see, if an approx. "1000 watt genny" is approx. 16 foot diameter, then being very loose with the math and using proportions instead of a fancy formula:

1000 = X * 64 (8 foot radius squared), so our "rule of thumb" proportional constant 'X' comes out to 15.625 (1000 divided by 64).

So very roughly, watts equals 15.625 times the radius squared, or radius equals square root of watts over 15.625.

That suggests that 100 ten watt gennies (our "field of dreams") would be made up of 10 watt gennies that are of approximately...r = square root (10/15.625) = about .8 feet of radius or 1.6 feet of diameter for our 100 little gennies.

Let's see, which is harder...
1 sixteen foot genny
       or
100 1.6 foot gennies (not much different in size from a typical box fan)

With these particular numbers, scaling down our size by a factor of 10 scaled up our quantity by a factor of 100!

I think I would pick one big machine...

jp

(Please note: Algebra class was darn near 40 years ago!  No promises, your mileage may vary)
(side note:  If my math works, then a 20KW genny is about 70 feet diameter, 100KW genny would be about 160 feet diameter - 1MW Genny would be about 500 feet diameter!  a Texas sized genny to be sure!)
(side note 2: my numbers seem to mostly work, but just found 1.5MW genny at 230feet, so at these sizes, my rule of thumb gets pretty far off - although who knows what wind speed my 1000 watt 16 foot appox was, and what windspeed was used to approx. the 1.5MW 230 foot genny - alternator weighs 36 tons - http://www.desertskywind.com/  )
MountainMan, Julian California
http://www.real-home-based-business-opportunity.com
My ultimate hobby project is to build a ten foot tall robot.



Re: A bunch of little Gennys (3.00 / 0) (#4)
by Norm on Sun Sep 25, 2005 at 01:58:53 PM MST

   This is just a hobby for me ....Where I live
(about a 1/6 of an acre)the neighbors would be
more tolerant with 100 little Gennys than a 16
ft. machine that could flatten about 4 or 5 trailers...if it ever fell !
                  ( :>) Norm.
( :>) Norm
[ Parent ]


Re: A bunch of little Gennys (3.00 / 0) (#5)
by ghurd on Mon Sep 26, 2005 at 12:14:57 PM MST

A 16' machine here would have the guy wires in the neighbors, neighbors, neighbors yard.  And they would cross at least 2 streets and an alley!
So its small or nothing here.
G-
Ghurd.info
[ Parent ]


Re: A bunch of little Gennys (3.00 / 0) (#3)
by obelix on Sat Sep 24, 2005 at 02:14:41 AM MST

Hello

Just to say, it's a good solution with a slow wind ...
Put a bicycle hub generator on every genny and all gennys in parallel and you have ten Watts/genny generator with as little as 2mph wind speed ....
Then just a tunecharger (www.tunecharger.com) and you have a very nice, low winspeed yard  generator ....

Hope this help !!



Re: A bunch of little Gennys (3.00 / 0) (#6)
by ghurd on Thu Sep 29, 2005 at 09:31:55 AM MST

Smashed appart...
I mean "carfully removed"...
Magents from some hard drives last night.
Also had a look at a 5.25" floppy drive.
The drive motors are like mini F+Ps.

The floppy motor lights a green LED easy,
not rectified, just accross 2 of the outputs.
Looks like 3 phase star wired.

Real nice bearings, mounted on a steel plate.
Looks like easy fun.
With 3 paint stirs, 6 LEDs, a little expoxy...
Another goofy thing for my neighbors to laugh at!

The magnets were a bust.
Not a one matched anything I had before.
G-

Ghurd.info



Re: A bunch of little Gennys (3.00 / 0) (#7)
by elvin1949 on Fri Sep 30, 2005 at 01:12:19 AM MST

There is a web page about making a wind genny out of one of those.
I can't seem to find it now though.Came by a box full of those floppy drives-be fun to play with.
later
elvin

[ Parent ]


A bunch of little Gennys | 7 comments (7 topical)
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