Because the Sun's position in the sky changes throughout the day, a static module or collector is hardly ever optimally placed to receive the Sun's rays at right angles to its surface. The best compromise solution, in the case of a module/collector that will never be moved, is to set up the device facing south (or north in the southern hemisphere) at a tilt angle equal to the latitude. An improvement in power- or heat-generating capacity of anywhere from 10% to 40% is achievable if the module/collector is moved to keep the incoming sunlight more perpendicular for more of the time. In some cases, this may involve manually adjusting the angle of the device several times a year to compensate for the Sun's seasonal north to south migration. In order to follow the Sun's daily east-to-west motion, tracking arrays are available.
Related category• SOLAR ENERGY AND POWER
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