Owner’s Manual
BWC EXCEL 10 Turbine
Page 8
The tail assembly keeps the rotor aligned into the wind at wind speeds below
approximately 35 miles per hour (16 m/s). At about 35 mph the AutoFurl® action turns
the rotor away from the wind to limit the rotor speed in high winds. The tail appears to
fold, but in reality the tail stays stationary as the rotor turns sideways to the wind. The
rotor furls to a maximum angle of 75 degrees (limited by rubber tail stops), so that the
unit continues to produce power in high winds. When the high winds subside, the
AutoFurl® system automatically restores the turbine into the normal straight position.
The rotor continues to spin even in very high winds and this actually makes the blades
stiffer. The AutoFurl® system works whether or not the Powersync II inverter is on or
not. Unlike many other turbines designs, the Bergey EXCEL 10 can operate safely
without an electrical load connected to the turbine.
F.
SPINNER AND NACELLE
The spinner (nose cone) and nacelle provide additional weather protection for the
bearings and the slip-ring assembly. The nacelle also improves lightning protection.
G.
Powersync II Inverter
The ETL-approved Powersync II inverter converts
the “variable AC” from the Bergey
EXCEL 10 turbine into utility grade electricity so that it can be connected to the wiring in
your home. This conversion requires sophisticated electronics and is designed to
operate automatically. The Powersync II has a digital display that provides information
on the status of the system, its current output power, and its cumulative energy
production.
