Specifications(500W) Type: 3 Blade Upwind Rotor Diameter: 2.5 m Start-up Wind Speed: 2.5 m/s (5.6mph) Cut-in Wind Speed: 3 m/s (6.7 mph) Rated Wind Speed: 8 m/s (17.9 mph) Rated Power: 500 Watts Maximum Power: ~ 700Watts Overspeed Protection: Auto Furl Temperature Range: -40 to +60 Deg. C (-40 to +140 Deg. F) Generator: Permanent Magnet Alternator Output Form:36 VDC/24VDC Nominal