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Theres a lot more to solar cells than meets the eye.
In addition to the efficiency you got different classes of cells. Then you have panels of different voltages. Some panels are made for 12 volt batteries, others are made for grid tie inverters and are a higher voltage.
You really need to make a chart of what you want to accomplish, then work it out. Find the most limiting factor rathers its size of the solar array, say your roof or part of a yard or budget. Then work backwards.
Lets say you are going off grid or want to knock 50 bucks off your power bill or add power to a garage or basement.
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