I did these calculations because you had said that you would like to build your own. And since the generator that you had failed, I wanted to show that it is possible to build your own, especially with your talent and mechanical skills. I just wanted to give you some options in case that you wanted to go that route.
Here is some additional information:
The cost for the magnets would be about $480 and about $825 for the copper wire. The weight of the magnets is about 185 Lbs. and the copper wire (coils) about 66 Lbs. The steel rotors are about 117 Lbs. each and about 15 Lbs. for the vinyl ester resin. The complete generator with the shaft and bearings would weight about 530 Lbs.
The harder part about building this would be winding the coils. I would not attempt to wind these size coils myself. There are businesses that custom build the coils for you according to your specifications. Here is one that can do the work:
http://www.production-solution.com I am sure there are many other businesses that do that kind of work.
Here is a picture of a low RPM alternator that a Company in Vancouver, (Mermaid Power) is using to generate power from the up and down motion of the waves. As far as I know they are still at the experimental level stage.
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The website is:
https://www.neptunewave.ca That generator has 40 magnets and 30 coils. The rotors are 40 inches in diameter and produces 240 Volts at 47 RPM. At one time he had it for sale on the Hugh Piggott Blog, but then he decided to keep it. He claims that it could produce 6 Kw under ideal conditions. The one I suggested is about 48 inches. I calculated that for 24 RPM, but it could be made smaller if it could rotate at 40 RPM.
Like I said before, I'm not trying to convince you of anything, just giving you some options so you can make an informed decision.
By the way, I saw that video that you posted of the wind storm last December. Did it damage any of your wheel or equipment? I felt that storm here but it wasn't that bad in my area. It only disturbed my sleep and sent some trash cans flying.
If you have any questions just ask. By now you know that there are people here that have built their own generators and know their stuff. Not me, I just have a little bit of head knowledge. Soon I'll be building my own generator, but not a big one like this.
Ed