http://www.americanzephyr.com/img/am_printable_version.pdf

Intelligent Power Management System
The intelligent power management system incorporated in the
Airdolphin Pro is the outcome of our continuous R & D work in the
maximization of power generation efficiencies. The power management
system, controlling fixed-pitch blades, incorporates unprecedented
technology in the wind power world, offering power output
comparable to or even surpassing variable-pitch blade systems. By
realizing constant blade rotation speed, operation of the wind turbines
has been made much more silent and secure. This newly developed
system uses our original and patented technologies of maintaining
uniform rotor spinning speeds while encountering turbulent gusts
found in cities or raging winds at remote locations. Even in hurricanes,
the Airdolphin Pro can still deliver stable output power after its peak
output of 2.3 kW at 20 m/s (44.7 mph) wind speed has been reached.
These attributes, specifically for small wind turbines, are very crucial
because, unlike large wind turbines, they are often installed in cities
where turbulence is caused by tall buildings.
When the wind speed increases beyond 20 m/s (44.7 mph), the
Airdolphin Pro continues delivering output power at a reduced rpm
eliminating the need for cut-out entirely. The intelligent power
management system inside the turbine achieves its outstanding performance
by software driven microprocessors including control firmware, an internal
battery charge controller monitoring voltage and charging rates in a
variety of climatic conditions, a web interface and
data logging functions. The Airdolphin Pro also
has various safety features enabling it to sense
adverse conditions like over-heating, excessive
blade rpm, and blade strikes, and automatically
shut itself down. Airdolphin Pro with its excellent
dynamic wind energy capturability is ready to
set new industrial small wind turbine standards.