Charge controllers work by monitoring the voltage of your batteries.
When the voltage drops below a certain level, the charge controller allows the batteries to take a charge. The best thing to do with it is to have a secondary load, like an extra set of batteries or, for example, a hot water heater.
Without a blocking diode, the power in your batteries would travel out to your turbine motor, spinning it round and round.
As long as you have an acre or so of land, you have room to build and install a large home wind power system.
In fact, the government is encouraging people to do just that.
Today, however, people have gone full circle, having a strong desire to get off the grid. Others are looking for a way curb the costs of rising fossil fuels.
Many are looking for a way to generate electricity that does not pollute and damage the environment. Major power producing entities have yet to jump back on the wind-power train.
Fossil fuels, despite being filthy, are going the way of the dodo bird, and as their supplies dwindle, energy prices are going to rise dramatically.