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Another method is to backprint on clear or matte lexan film and then spray paint a background color. The image is thus protected and really professional. Corel Draw allows mirror imaging so the image comes out correct when printed on the back of the film. I use this regularly with a laser printer.
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Not to nit pick but this seems way off. The rule of thumb on total insolation is 100 watt per square foot so 100 square feet would give 10KW maximum. You claim up to 6.7 KW, but the most efficient solar cells in home power systems is less than 30% and most of the energy lost is in the form of heat, not reflection. The numbers simply don't add up.