A DC generator, a rotating turbine, a pole to put the fan on, a length of wire, an inverter to convert DC to AC, and a battery to store excess electricity. It won't be very weak. You cannot guarantee reliability if you make it yourself. This is linked to your know-how. If it's just for fun, you can try it. If you want to use it, buy it ready-made.
What does it take to make a homemade wind turbine and how much does it cost?
Introduction What do you need to make a homemade wind turbine? Approximately how much it costs: a DC generator, a rotating turbine, a pole to place the wind turbine on, and a length of wire.