I need a wind turbine which only produces about 50 Watts effective power in winds of about 20km/h - 25km/h. I know that using a standard car alternator for larger amounts of power output is not recommended because you need to gear the system so that the alternator spins faster ( and you need to excite the coil in a non permanent magnet alternator). But, if any of you experts( and novices ) might want to see if you can help: Will I be able to achieve 50 Watts effective power in 20km/h wind when mounting the blades directly onto the alternator ( no gearing )? I suppose it will depend on the exact alternator, but lets assume some standard car alternator, the one I have came out of a ford 1600 bantam I think.
Thanks for any input/help.