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The energy requirements for the production of photovoltaic (PV) panel and balance of system components are analyzed in order to evaluate the energy payback time and CO 2 emissions of a 1.2 PV roof top system in Brazil.The single crystalline panel technology is investigated by using life cycle assessment methodology.It considers mass and energy flows over the whole production process, starting from metallurgical silicon production to the electric generation.Assuming seven different national geographic conditions, cumulative energy demand (CED), energy yield, energy payback time (EPBT) and CO 2 emissions rates are calculated.As result it is found that the EPBT is 2.47 -3.13 years and CO 2 emissions rate is 14.54 -18.68 g de CO 2 eq/kWh for present day roof-top mounted installations.
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Fukurozaki et al. (2013) studied this question.
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