zvizdic,
Don't worry about the transformer, were not going to need it for the lower voltage circuit, I only used it to drop my incoming voltage to something more reasonable, I didn't pull any noticeable current from it anyhow, its only there to give a zero crossing signal to the frequency-to-voltage converter chip. The chip has a max input voltage of like 28 volts, I think. In your case we will just use a simple zener clipper to keep the signal to a respectable level, since we need almost no current I think this will be a good place to use a zener clipper.
Most likely winter heat, more, more, more, and I have a couple other things up my sleeve as well, never buy a grid tie inverter though, it would just cost way too much for those kind of power levels. Yes it will be a huge undertaking. The old tower (experimental tower and trubine) was made using 2" angle 1/8" thick for the legs and 1/2" round bar cross braces, 40 feet tall at the platform, 50 feet at the center of the blade hub. The new tower, legs will be 4" square tubing 3/16" thick and cross braces will either be angle iron or 1" square tubing. also 40 feet tall at the platform, 55-58 feet at the center of the blade hub, depending on blade diameter.
Probably go with wood blades again, mine have held up great and at scary fast speeds (too fast actually), a jacobs type hub will be used to keep the rpm's down on the bigger one I make.
I will start a new post once I get something going and take pictures to post.
Matt