The Small Wind Certification Council (SWCC) has recently certified two wind turbines suitable for residential-scale systems: the Evance R9000 and Kestrel e400nb.
Evance Wind Turbines’ (evancewind.com) R9000 is a three-blade, upwind, passive yaw, horizontal-axis wind turbine with an 18-foot diameter and a 23.8 m2 swept area. This pitch-controlled machine continues to generate while governing, capturing up to the full 5 kW power rating in high winds.
It has a 200 rpm nominal speed, with a permanent-magnet alternator. A 5 kW inverter provides 240 VAC, single-phase. Two 2.5 kW inverters are also available for three-phase output.
The estimated annual energy at 11 mph average wind speed is about 9,000 kWh. With 8.9 mph average, estimated energy is 5,000 kWh per year. The turbine carries a five-year warranty.