Abstract
The ratio of self-consumed electricity to total electricity produced by a photovoltaic (PV) system depends on whether consumption and production match in time. A temporal mismatch can be partially overcome by buffering the energy produced by PV, e. g. in a battery. A key impact factor which affects the techno-economic performance of PV-battery systems is the household load profile, which may significantly change over the lifetime of the PV-battery system, but the effects of a changing load profile on e. g. the self-consumption ratio were not yet investigated. This paper shows on three different examples the possible changes over the 21 year lifetime of a typical PV-battery system. It is demonstrated that changes in the behavior patterns and the number of residents can cause the self-consumption to vary by more than a factor of 2 over the lifetime of the system. When dimensioning such a system e. g. for optimal return on investment over the lifetime or for a certain degree of autarky, not only changing energy prices, but also changing household structure and changing behavior of the household members should be taken into account.
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