i would be willing to bet, the custom delco is not going to produce anywhere near advertized, it just isn't going to happen.
i don't care what kind of magnets they put into it either, the machine is just too small to get the required rim speed needed to make any real power at low wind speeds.
these guys that are selling these things and making such claims are damaging to everything good about windpower.
he can claim custom designed stator too, it is too small, to tight to pack wire into and just a mess in my opinion.
i have been custom rewinding stators for alternators for the better part of 32 years now, and as far as i am concerned these guys are starting with a delco because it is cheap, widely available and thought of as being a great little alternator (which it is for what it was designed for, automotive).
i might get onboard with them, had they started with a large frame alternator, but then again they would have to start with a core that is about 150 bucks before rewind and magnets, then the finished cost would be about a grand and the output would still be well under 500 watts in reasonable wind.
i know everyone wants an off the shelf wind power solution, however if one wants more than 50 watts in reasonable winds (read that ~12mph) he ought to just buck up and build an axial like everyone else that is serious, or spend the very real bucks for a proven design by someone that has been in the industry for longer than maybe 10 years, and that has some solid third party testing results.
these delco's are a joke!
in closing, one must also consider cooling requirements of a small delco alternator, at 150-300rpm there is no where near enough airflow to cool the stator "if" the machine makes more than about 100watts on a continuous basis... furthermore if the machine were to make the kind of power these guys claim (when i speak of these guys, i mean everyone that makes and sells these things) at the low wind speeds advertised they would go thermonuclear in less than a couple minutes.
now having said all that, it's not all doom and gloom, it is possible via a gear train to get the delco spinning fast enough to make some power, but even then my bet is one is going to hard pressed to get more than a a few hundred watts at anything under a 20mph wind.
but then again, if you are going to go to the trouble of a gear train you ought to look into something more able to take advantage of the work involved.
bob g