the whisper 100 is great for telecommunications, outbuildings, or home use. it has three-blade 2.1 meter (7 ft.) diameter rotor, is lightweight, and economical. the whisper 100 can withstand the toughest wind conditions. ......the whisper 100 is great for telecommunications, outbuildings, or home use. it has three-blade 2.1 meter (7 ft.) diameter rotor, is lightweight, and economical. the whisper 100 can withstand the toughest wind conditions. its rated power is 900 watts. the stock no. 450470 whisper 100 includes a 12-24-48v multi-voltage controller but can also be sold without it. it is also available for marine applications.