A car alternator regulator won't work.
Car alternators use power to make magnetic fields, we use magnets mostly.
The 'power transistor can automatically adjust current vs load' part has me puzzled.
You may be asking about a MPPT regulator?
A overly simple explaination,
but a 'shunt regulator' turns a load on at a set voltage. Just to 'waste' the extra power.
If the battery reaches say 13.9V the shunt regulator turns a load on,
draining the extra power to a 'dump load'.
The extra power is shunted or re directed to another place instead of the battery.
When the battery drops to say 13.7V the dump load is shut off.
Most have a series of on and off set points, allowing the most power to charge the battery. They may be set, for example, at a very large load is turned on for 14 to 13.7V, a smaller load at 13.85 to 13.65V and a small load at 13.8 to 13.6V.
Many people use the shunted power to heat water so it is not just wasted.
A series type controller simply disconnects the power source from the battery.
This is fine for solar panels.
But disconnecting all loads from a windmill will cause an unloaded condition.
Meaning there is nothing holding the blade speed back, or the peak voltage down.
The speed could blow the blades apart.
The high voltage could kill someone or fry all the electronics.
Car regulators adjust voltage by changing the amps to the magnetic areas producing those fields. But we are mostly using magnets with the fields set by the magnet strength. Why make a electro magnetic field with power forever if you can buy one, once.
G-
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