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Although solar panels are used all year round they are only efficient when they receive direct sunshine. They produce very little power in cloudy conditions or in the shade. However, it is the light that produces electricity. Heat actually interferes with electricity production so solar panels used in very hot climates are less efficient than those used in sunny but cold climates. When the panel’s temperature is above 50 degree centigrade its efficiency will decrease. Also, at different times of the day, as the sun angle to the panel varies, the amount of energy produced is different. Usually it is better if the panel is inclined but on cloudy days horizontal mounted panels are more efficient. Most energy is generated when the panel is pointed directly toward the sun. Find out where to buy cheap solar panels by visiting the site.