Yes, in the commercial world of wind power a 17 foot machine will be typically rated at 6 kW output @ 12.5 m/s. This allows for a generator efficiency of slightly better than 75% at full rated power.
In the case of the "otherpower 17" if you ever did get it to that output, continuous, you have a disaster on your hands. Assuming you can drive your bank to 60 volts, you got 100 amps output with dual 14 gauge windings in the stator? Even my grandson knows that's not going to work.
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Chris
Edit: I would like to add that in the "real world" you'll probably have about 20 volts drop in the line getting the power from the gen to the battery. Ideally, with this turbine you should have 40 volts drop. So assume it's running at 100 volts at the generator @ 6 kW. It's still putting out 60 amps. That's way too much for dual 14 windings.
At 60 amps and .3 ohm it's dissipating almost 1,100 watts in the winding and you only got 3.6 kW output to your battery. From the input shaft to the battery you're losing a whopping 4,160 watts. This is why I don't consider much over a 12 foot wind turbine to be even remotely practical for battery charging. You're better off with two smaller ones.
On page 268 of the " Homebrew Wind Power " book it does say it's a 3000 or more continuous watt turbine and peaks of double or more are possible from it. I only wish the wind blew hard enough around here for long enough to burn that thing to the ground. Then, I'd have a reason to put up one of yours.
In reality, for what it's used for and where it is placed, it does fine. I did make a few changes to it, bearings for one as well as magnet rotor diameter and 3 in hand 14awg copper. The copper was in fact a recommendation I got from fieldline members.
So, even though those plans were published, I have to respect that the Dans do admit and update as problems arise.
Edit: I said even though those plans were published, what I mean by that is: Because the plans were published, and because the Dans have included at least one acknowledged weakness, I respect the Dans for their updates.
I should also make a point to thank you too as well Chris for helping the rest of us that have not been fortunate enough to experiment and prove different ideas as you have. So, Thank you.