The exact amount differs depending on type and size of the photovoltaic panel, of course. The number to look for is the energy payback time. Back in 2000, it took 8-11 years for the panel to generate as much electricity as was spent making it, but this number is much smaller now, at about 1.5-3.5 years for crystalline silicon technology, and 1-1.5 years for thin-film ones. The exact number will depend on the placement, specifics of the panels (such as material) and supporting equipment.
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