The decentralized character of the German Energiewende is most evident in the installation of more than half a million domestic rooftop solar systems. Their success story however has slowed down in the last two years because of frequent regulatory updates, anti-dumping measures, decreasing feed-in tariffs and little experience with the influence of electrical self-consumption. To make it even more complex solar battery systems were introduced to the market increasing the number of layout factors. In this paper we present a detailed techno-economic model to compute the profitability of different PV-battery-setups. All technical parameters as well as current German regulation and appropriate cost functions especially designed to small systems and derived from an extensive market survey are taken into account. Rates for self-consumption are determined by a continuous power flow simulation. All input data is assessed and uncertainties analyzed by means of a Monte Carlo Simulation. A sensitivity analysis finally identifies the parameters of highest influence. Optimizing self-consumption with batteries is close to being a business case for electro-chemical storage and this paper provides a detailed analysis of various setups and technologies.
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