I am getting ready to build my first wind alternator based on The Evolution Site. From looking at DanB winter update that shows rotor size of 15" for what is described as 12' machines. In the plans for the 15' machine it shows 14" rotors and arc shaped magnets. I will be building a 15' machine for what looks to be wind alley in northern Arizona. Wind maps show an average of 12-15 mph and it sure seems to be higher than that. I will get real readings before building blades. My questions are as follows, What size rotor? magnets? and coil? Would like about 1.5kw@24v I also need to know what size diodes for my rectifier bridge, Will 85amp be ok? Any bigger and they get costly. Luckily i can work with wood and metal and have the tools needed. I have looked at a lot!! of postings for answers so any help will be appriciated. Thanks much.