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wind power- any comments on this statement - Page 15

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Posted by Josepi on December 29, 2009, 3:34 am

The other item I noticed is the generator seems very small and inhibits the
many more poles it appears it should have. It would seem to need a gear up
box to generate a decent amount of power / voltage from the low RPM speed. I
didn't really catch the rated output power rating in the information. I get
the impression these units are really limited in top speed. This would be a
good thing but needs to be addressed in the design. The 8-10 poles and low
speed doesn't seem like enough to put out decent power.

These VAWT units really catch my eye as I live in a very gusty area with
wind gusts up to 120 km quite frequently through the winter and spring
months. My horizontal axis turbine is down right now, due to construction in
the way, but I get nervous about putting it back up. It is only 20' in the
air but the gusts make it pretty scary and hard on the units. The verticles
look like a much better selection for me.

The generator's output has to matched to the turbine's input power
(blade size), the blade profile is such that it becomes inefficient in
high winds, so the turbine is designed to only run within a specific
wind speed range, the guy that created that design has pretty sound
math, and I would stick pretty close to his design.

I wouldn't worry about the oxidation of the stator & rotors, that type
construction has been used on DIY horizontals for years now. Don't
know much about their bearings, but I would think they're outlined
somewhere in that first link.

All in all they compare well to small DIY horizontals, the problems
pop-up when scaling them up and protecting them from extreme wind


Posted by Curbie on December 29, 2009, 5:25 am


The thing about turbines is they are designed to run within a
wind-speed range based on their blade design, to me, it doesn't make
sense to try to run a 7457 watt generator design to run on a 10hp
(7457 watt) engine, with a 5hp (3728 watt) engine. I think if you
tried, you'd get less than the 3728 watts you'd expect with the proper
generator. (I think I read that the metric system use watts instead of
hp, hope that made sense.)

I don't know, the Lenz 2 I posted is rated by it's designer for about
25 MPH (40kmh), especially if you have high winds you might be better
off with the horizontal (furling).

Otherpower.com has a wind turbine board they have some heavy hitters
out there Hugh Piggott, Ed from windstuff, Dan Bartmann and Dan Fink.
Not the friendliest or most helpful bunch, but if you catch a break
there are some real knowledgeable people out there. Can't hurt to try,
I just don't know that much about verticals.


Posted by Josepi on December 28, 2009, 10:22 pm

Another thing I noticed.

I wonder where the second bearing point to hold the thing from flopping
over, is.


When I'm looking for something I can't find it, and when I'm not, I
do. Ran into that Lenz 2 built by that metal shop:


Posted by Jim Wilkins on December 28, 2009, 11:36 pm

Thanks. That design looks like it could be built up from relatively
small sheets of scrap aluminum, with the ribs bent  from angle or
tubing. Have you seen one that feathered itself in high winds?


Posted by Curbie on December 28, 2009, 11:57 pm


Nope, that's a  problem, high wind event protection.


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