Hi Fernando,
The mast is just under 12 metres tall. Here in Europe there's a limit of 12 metres on the height of the mast. If it's over 12m you need to get planning permission from the local authorities and also permission from the regional authorities because the generator will create "an impact on the environment". If the thing is under 12m you can avoid all this administration.
The generator is 3KW and drives a series of 20 batteries of 200AH. There's a controller that monitors the charge, the wind speed and direction. The wind speed and direction signals are used to control a servomotor in the generator and keep it pointing towards the wind. The circuit will also sense when the windspeed is too high and turn the generator through 90° thus acting as a kind of brake.
There are solar panels to augment the wind turbine output but as yet these haven't been installed (I need to repair the roof on the barn!) The system was purchased from a company called Kingship in China: turbine, mast, blades, batteries, controller, inverter, solar panels, and delivery $10,500
I live in France and I had to pay customs on the import. I have since put the system together myself. A large foundation was dug out for the mast (18 metres cube), a battery box, underground cables, a crane to hoist up the mast, etc. There were several initial problems getting the thing running because the blades weren't properly balanced, and then one had a leak and picked up water causing a further imbalance. Now it seems to work OK and the batteries supply enough power to run the house for four or five days from full charge when there's no wind. The noise is negligible, around 50-55dB.