The power coming from the wind turbines your likely to see here is known as wild ac.... Its called that for a reason.
It is the wind that will ultimately dictate what happens with any given wind setup. We tend not to try to control the output, just try to use it up as it comes to us.
If we were to somehow "voltage regulate" it , we would run the very real risk of it getting away and destroying itself.... so we don't do that either.
What we do do is to charge the battery with all the mill can muster, until it gets to your 13.8v, and then using a small electronic switching device, we divert or load the system to keep the battery voltage at 13.8v. If we divert or load too much, we lower the battery voltage, if we don't use enough, the battery voltage will continue to rise.
So the diverter can drive a load.. proportional to what we have left over from charging the battery.
The load I refer to is called a "dump load". It is usually an array of power resistors, whose lot in life is to burn up excess power.
A small unit like the one that Ghurd sells http://ghurd.info/ (with appropriate resistors) will do the job of stopping your battery from overcharging, by hiving off the excess power and diverting/dumping it into a resistor array. (I think Ghurd can help with these as well)
In my system, when battery float is reached in my EV batts, they turn the mill off by shorting the stator with 150amp normally closed relays. They do this in any wind... but you need a stiff alternator for this kind of thing. Most use small 2x1x.5" magnets, and they wont handle this too well unattended, so most people here use a dump controller and resistive load.
.............oztules
