Chris, Yes the power you are getting from a 10 foot turbine is great.. I understand that you will have some losses in a geared turbine ,but when you can use ferrite magnets to get that kind of output,,,well I would say that is really something.I do have the shop and tools to put one together,though I am not a ma chinest by trade,I can usually get things figured out with the tools I have..I have a large lathe over 30 inchs of swing, and also a smaller one.A bridgeport.large drillpress, shear,.break, and lots of welding equipment,as I am a welder fabricator,ect..I was thinking about a machine with a 20 1/2 inch magnet rotors,using C8 ceramics 1 1/2 inchs wide by 4 inch's long.16 magnets on each rotor,and 12 coils..Also was thinking about making my stator thinner,around 3/8 of an inch thick,which will give me more flux pull because the distance between magnet rotors would be less than most machines I have read about.. Also with a machine that size it would allow me to make fairly large coils ,by making them thinner but also making them wider.Each leg on a coil could be around 1 3/16 or so wide.. With this type of machine I should have good flux,and a good output from the coils as well..The machine would be 3 phase like most of the ones I have read about.. I don"t know anything about the Mppt controler you talk about..But was wondering if you just charged batteries and than run through an inverter ,,how much more efficient would your mppt set up be over a battery charging system,,all things except the controller being equill.. Thanks Duff Bio Diesel Man