MPPT uses a table that has volts vs amps. When the wind turbine reaches a specific voltage, it matches the amps in the table. So the table controls amps and volts going out. The volts and amps are then compaired to the battery voltage and amps and the state of charge.
Usually the turbine manufacturer will be able to give you the info you need to program the charge controller. You will probably need a large resistor to burn the excess power when your batteries are full. That will keep the turbine from over speeding.
If you are considering making your own you will need to input your own table. I've done this by testing the alternator. Spin the alternator to 10 rpm, record volts and amps then go to 20, 30,40, etc.
There are ways to control the output by controlling the input amps, but it's generally not done on small wind turbines.
There's much more to setting up a home made wind turbine than using solar.
A few websites specialize in this.
Anothpower.com
Otherpower.com
TheBackshed.com
WINDSUN.com (NAWS)
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