Specifications(300W) Type: 3 Blade Upwind Rotor Diameter: 2.5 m Start-up Wind Speed: 2.5 m/s (5.6 mph) Cut-in Wind Speed: 3 m/s (6.7 mph) Rated Wind Speed: 7 m/s (15.6mph) Rated Power: 300 Watts Maximum Power: ~ 400Watts Over-speed Protection: Auto Furl Temperature Range: -40 to +60 Deg. C (-40 to +140 Deg. F) Generator: Permanent Magnet Alternator Output Form: 24 VDC Nominal