Photovoltaic panels or solar cells, as they are often called, give you the option to extract electricity from the sun, a never-ending supply, for free. However, we all know that there is the initial cost of the equipment and the installation, that is, unless you do it yourself. Even then, there is the possibility of damage to the cells and components.
...Source: http://electrical.about.com/b/2013/08/23/2718.htm
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