Hi, I live in a low wind area and the small alternator I built produces 6 volts at about 250 RPMs which works will the VAWT I fabricated. I am trying to stay away for larger units and tall towers; so I am planning to construct 3 small turbines that are roof mounted and connect them to charge a battery bank. The turbines are low cost and easy to fabricate but I need a circuit that will connect the 3 to get charging voltage that I can connect to dump load charging circuit for charging the battery bank. Will this circuit work? Thanks in advance for any feedback received.
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YouTube - VAWT alt Test (http://www.youtube.com/watch?v=Ip-azQDDxpI)

Looks like it should work, You're figuring 18 Volts for total of the 3. It doesn't increase current, but does increase voltage.
You may want to look through here:
http://www.otherpower.com/otherpower_wind_alternators.html