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How much power does the small scale wind machine generate?
18 KW
2 KW
12 KW
30 KW
2 KW
Quick Summary: In small-scale wind energy conversion systems (WECS), the power generation capacity is typically categorized into micro, small, and large-scale applications. A small-scale wind turbine for domestic or standalone rural application is standardly rated at approximately 2 kW.
In small-scale wind energy conversion systems (WECS), the power generation capacity is typically categorized into micro, small, and large-scale applications. A small-scale wind turbine for domestic or standalone rural application is standardly rated at approximately 2 kW.
P=21ρAv3Cp — The power extracted from the wind by a turbine, where ρ is air density, A is the swept area, v is wind velocity, and Cp is the power coefficient.
The wind turbine converts the kinetic energy of air into rotational mechanical energy using blades. This mechanical torque drives an electromagnetic generator, which converts the rotation into electrical power according to the principle of electromagnetic induction. The power output is determined by the wind speed, blade swept area, and air density.
Small-scale wind turbines (micro-wind) are generally defined as having a capacity below 5 kW.
Power output is proportional to the cube of the wind speed (v3), making velocity the most critical parameter.
The Betz Limit restricts the maximum theoretical power coefficient (Cp) to 59.3%.
These systems often use permanent magnet synchronous generators (PMSG) for efficiency at low RPM.
Reduces dependency on the main grid for remote locations.
Low environmental impact and carbon footprint.
Modular design allows for scalable energy solutions.
High intermittency due to dependence on wind conditions.
High initial cost per kilowatt compared to large utility-scale wind farms.
Requires battery storage systems for consistent power supply.
Remote rural electrification.
Small home appliances and lighting.
Battery charging for off-grid sensors and telecom equipment.
Small-scale wind machines are primarily designed for decentralized energy generation.
The 2 kW rating is standard for domestic charging and small-load applications in engineering textbooks.
Options like 18 kW, 12 kW, and 30 kW represent medium or industrial-scale wind turbine capacities rather than small-scale micro-wind units.
B is correct — A small-scale wind machine is typically rated at 2 kW for localized or micro-generation applications.
Always remember that wind power scales with the cube of wind speed; thus, even a small increase in wind velocity significantly boosts power output.