Hi.
I have some little steppers from recycled old stuffs, dump diving.
A lot are 27 volts, 4 wires, but they have different ohms : 8Ω, 16Ω, etc ...
I can't figure myself the influence (or not) of this characteristic, when I'm trying to choose the best motor to use in place of a generator.
This is for a little windmill, with a little surface of wings against the wind.
I will be thankfull for laconics answers :"The less ohms is the best." and, too, I will try to follow explanation if you have. I searched with several search engines, and I saw nothing related to that.
Thank you bdk6 !
And I appreciated the simple explanation you made. Tomorrow, I will choose “The” motor, and I will know why, wich make me feel good 
This link might be of
This link might be of interest to you … he dose a great write up on building a wind generator and he also has a great write up on a charger controller based on a 555 chip …
http://mdpub.com/Wind_Turbine/index.html
Yes, thank you Photolong !
This link is great, even if it concerns effective windmill ; I came across, but loose it some time ago. But I remember that extremely clean build, the serious approach, and I think he his the only one who experimentated/wondered around “aerodynamic or nothing ?” stuff at junction of the wings.
I had read article about your stepper generator with interest, and that’s also something more witch make me decided to do something in this way.
Hi Maxhirez !
Thank you for your reply. My skills havn’t move but you improved my hapiness
Motivation is a master piece when you build bots as a hobby.
