Endurance wind [RE-wrenches]
Matt Tritt
solarone at charter.net
Thu Feb 21 15:12:09 PST 2008
<x-flowed>
Keep in mind that these machines have asynchronous motors, are
gear-driven and have a fixed-pitch rotor. They also have a lot of small
parts that are required to allow them to operate, including a hydraulic
brake pressure pump, an anemometer and control electronics. Remember
that you need to reach "slip" speed (usually >1800 RPM) on the high
speed shaft before connection to the grid can occur, and that there
isn't enough juice in winds < 10 to 11 MPH to accomplish connection
without a lot of false starts. For a small turbine, this seems like an
excessive number of moving (and non-moving) parts. Because they are
fixed pitch, they also must shut down when (correct me if I'm wrong)
winds hit 40 MPH.
I would also be interested to learn what happens when the weather gets
really cold. Large turbines have to have heaters to keep the oil in the
gearbox warm, but it's hard to imagine how this could be a good idea
with such a small machine.
I much prefer the higher efficiencies possible with gearless
direct-drive alternators and grid tied inverters. Not to mention having
far fewer critical wearing parts.
Matt T
Christopher Freitas --- OutBack Power wrote:
>Here is the website for the Endurance Wind turbine manufacturer.
>
>http://www.endurancewindpower.com/
>
>Seems like they are just finishing beta test and getting ready for
>production.
>
>It's a AC output machine - induction AC generator - no inverter - which
>usually gives poor performance at low wind speeds as the AC generator's
>power factor and performance is usually heavily dependant on being able
>to achieve reasonable RPMs. They do switch the output to 120VAC at low
>power and then to 240VAC at higher power - which is a interesting
>trick...
>
>The do advise using tall towers at least! Also no mention of roof
>mounting either... So the sniff test says they are OK...
>
>These should also be possible to use in AC coupled off-grid
>applications.
>
>Christopher
>
>
>EMAIL CONFIDENTIALITY NOTICE:
>The preceding message (including attachments) is covered by the Electronic Communication
>Privacy Act, 18 U.S.C. sections 2510-2521, is confidential, and may also be protected by
>attorney-client or other privilege. If you believe that it has been sent to you in error,
>please do not read it. If you are not the intended recipient,you are hereby notified
>that any retention, dissemination, distribution, or copying of this communication is
>strictly prohibited. Please reply to the sender that you have received the message in
>error, then delete it. Thank you.
>
>
>
>
>- - - -
>Hosted by Home Power magazine
>
>To send a message: RE-wrenches at topica.com
>
>Archive of previous messages: http://lists.topica.com/lists/RE-wrenches/read
>
>List rules & how to change your email address: www.mrsharkey.com/wrenches/etiquette.php
>
>Check out participant bios: www.mrsharkey.com/wrenches/
>
>Moderator: michael.welch at homepower.com
>
>
>
>
>
- - - -
Hosted by Home Power magazine
To send a message: RE-wrenches at topica.com
Archive of previous messages: http://lists.topica.com/lists/RE-wrenches/read
List rules & how to change your email address: www.mrsharkey.com/wrenches/etiquette.php
Check out participant bios: www.mrsharkey.com/wrenches/
Moderator: michael.welch at homepower.com
--^----------------------------------------------------------------
This email was sent to: michael.welch at re-wrenches.org
EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9.bWljaGFl
Or send an email to: RE-wrenches-unsubscribe at topica.com
For Topica's complete suite of email marketing solutions visit:
http://www.topica.com/?p=TEXFOOTER
--^----------------------------------------------------------------
</x-flowed>
More information about the RE-wrenches
mailing list