ALEKO 30W 24V Vertical Wind Turbine Wind Generator Mill Diameter: 15", Working Wind Speed: 9-44 Mph Airfoil Length: 15", Nominal Rated Wind Speed: 22Mph Max Wind Speed: 90Mph, Nominal Power Rating: 20Watts Maximum Power: 30Watts, Rated Output: 24V DC, Weight: 13Lbs, 1-Year Warranty