Sizing Your System
"Insolation or sunlight intensity is measured in equivalent full sun hours. One hour of maximum, or 100% sunshine, received by a module equals one equivalent sun hour. Even though the sun may be above the horizon 14 hours a day, any one site may only receive six hours of equavalent full sun. Why? For two reasons. One is reflection due to a high angle of the sun in relationship to your array. The second also due to high angle and the amount of the earth's atmosphere the light is passing through. When the sun is straight overhead the light is passing through the least amount of atmosphere. Early or late in the day, the sunlight is passing through much more of the atmosphere due its position in the sky."
(Submitted by Noel Tue Sep 21, 2004 )
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