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Posted by Grant Beuchel on June 26, 2003, 9:27 am
Assuming I have a lot of wind, what is better.....

1)   2 air 403's versus one turbine of another kind

I mean what is best in terms of money spent?

What other turbine would you recommend and where can i get it?

Posted by Dlehmicke on June 26, 2003, 12:58 pm

If you want AC power, you will need a battery and inverter along with your Air
403s.  If you already have a 12-, 24-, or 48-V DC system, you have what you
need to use the Air 403.

Southwest Windpower (the maker of the Air403), and Bergey offer larger
turbines, up to 10 kW.  I'm not at work, and my home PC is too slow to look up
which of those models are designed for battery charging and which produce 240
VAC power for direct connection to your existing utility service at home.  The
Bergey 10-kW machine is the latter.  It comes with a modified Trace Tech (now
Xantrex) inverter which outputs 240 Vac.  Most, if not all, of these larger
turbines come with either their own inverter, or their own charge controller
for use with batteries and someone else's inverter.

Last time I looked those two companies offered turbines in sizes of 1 kW, 1.5
kW, 3 kW, 7.5 kW and 10 kW.  There is also a company called Proven, but I know
nothing about them.

Be advised that all these machines need an annual wind speed average of 12 mph
to provide 25% capacity factor.  They need 27 mph to provide full output.  For
an Air403, your investment isn't that big.  Before you buy a bigger machine,
consider having a dealer in your area conduct a one- to three-month wind study
using an anemometer on your property.  It won't be free.
Not only will it tell you if you have the minimum wind speed to get useful
energy from your turbine, it will tell you if your wind source is so gusty that
the turbine furls (turns off) from time to time.  Most turbines turn off or
turn out of the wind at wind speeds of 40 mph, degrading your investment..  

Here's the energy scoop, assuming you have an average annual wind speed of 12
mph.  (Not many people do).

Take the full rating of the wind turbine in watts, and multiply by 2.  That is
the annual energy you will get out of the turbine in kWh.

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