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Payback time is the time it takes for the PV system to recoup the investment costs. Payback times for different systems vary tremendously and depend mainly on the price of the system and feed-in tariff. Simulation tools such as PV*SOL gridcon also calculate payback time as part of the economic efficiency calculation.
Figure 1: Capital flow over time of a PV system

Source: valentin 2009

Last page update: 07.03.2011