A DC generator, a rotating impeller, a pole to stand the fan on, a length of wire, an inverter to convert the DC power into AC, and a battery to store excess electricity. It won't be very low. You can't guarantee the reliability if you make it yourself. This is related to your craftsmanship. If it's just for fun, you can try it. If it's for use, then buy it ready-made
What does it take to make a home-made wind turbine and how much does it cost?
Introduction What do you need to make a home-made wind turbine? How much does it cost approximately? A DC generator, a rotating impeller, a pole to stand the wind turbine on, and a length of wire.