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Energy payback of solar panels 1 Citation Photovoltaics have great environmental benefits such as no pollution and no production of greenhouse gases. Nevertheless there is the issue of the energy payback of photovoltaics. To save energy through solar power it takes energy for their production. The basic question of energy payback is: how long does a photovoltaic system need to recover the energy which was used for producing it? For rooftop solar power systems the estimated time of the energy payback ranges from 1 to 4 years. This, technorati.com
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