7/28/2019 VAWTvHAWT

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2375 Rue Cohen

St. Laurent, QC H4R 2N5

Canada

(514) 39-2700

VAWT v. HAWT COMPARISON(FOR RESIDENTIAL APPLICATIONS)

Vertical Axis Wind Turbines (VAWTs) are emerging as the preferred medium scale turbine type due to their

many advantages in this scale. VAWTs are rugged, quiet, omni-directional, and create less stress on the

support structure. They typically require less wind to generate power, allowing them to be closer to the

ground, simplifying maintenance, making them ideally suited for homeowners and small businesses.

VAWT HAWT VAWT AdvantagesType 5 Blade

Vertical3 BladeUpwind

VAWT's are bird and bat friendly.

Noise @ 56mph wind @ 66ft 30 dB 45 dB VAWT's are quieter.

Overall Height 34 ft 60 ft VAWT catches wind more efficiently, doesnot need to be as tall. Easier to permit in

residential neighborhoods.Rotor Diameter 13.1ft 23 ft VAWT profile smaller, less obtrusive.

Maintenance AnnualLubrication

Gear mechreplacement.

HAWT pointing mechanism wears quickly inlocations with frequently shifting winds.

Number of Blades 5 3 VAWTs low height, blade shape andnumber of blades eliminate shadow flicker

issue.

Min. Startup Wind Speed 7.2 mph 9.5 mph VAWT starts up at lower wind speedswithout the need for pre-start motors.

Overspeed Protection N/A AUTOFURL Simpler design more reliable.

Price $26k $40k Simpler design 35% less expensive.