Active solar energy can power 40-80% of your home energy needs. Anything less than 40% is not cost effective. Besides home heating, active solar is awesome for air conditioning, detoxification of contaminated water and thermoelectric power generation.
For maximum ‘green’ power, position your solar collectors true south, tiled at an angle equal to your latitude plus 15°. The best time is 9am to 3pm when the collectors receive the most sun rays. It’s good for energy collection and optimum storage.
it depends on the type and size
http://www.mrsolar.com/
References :
Active solar energy can power 40-80% of your home energy needs. Anything less than 40% is not cost effective. Besides home heating, active solar is awesome for air conditioning, detoxification of contaminated water and thermoelectric power generation.
For maximum ‘green’ power, position your solar collectors true south, tiled at an angle equal to your latitude plus 15°. The best time is 9am to 3pm when the collectors receive the most sun rays. It’s good for energy collection and optimum storage.
References :
http://HomemadePowerPlant.pinurl.com