Primus Windpower Air X Marine 48v 1-ARXM-15-48 Features & Attributes Dimensions (LxWxH): 27 15 9 inches Weight: 17 lbs Brushless permanent magnet alternator Adaptable pitch aerolastic all carbon fiber blades Virtually maintenance free with only two moving parts Patented peak power tracking for greatest energy at all wind speeds Highly developed internal charge controller, externally adjustable for any battery use Exclusive Auto brakeâ?¢ slows the blades to a noiseless spin when the batteries are fully charged Marine designed powder coated aluminum body, all stainless steel hardware, marine grade wire, water tight housing 3-year guarantee Full Marine Tower Kit available for easy boat mounting. MPN: 1-ARXM-15-48