Calculation of the Cost-effectiveness of a PV Battery System

AbstractA possible way to calculate the cost-effectiveness of a photovoltaic system combined withelectric energy storage for a household is presented in this paper. To evaluatethe electricity costs, of the PV-battery system, the progression of the power demand and electricity production is evaluated and compared with cost and revenue of the resulting energy flow based on the electricity purchase prices and the EEG bonus for the feed in of renewable solar energy. The results show that solar applications with electricity storages can be profitable. But the high purchase price of the storage reduces the financial gain of the photovoltaic system. This paper also reveals that in the examined case redox flow batteries are the most promising technology and lead acid batteries are more lucrative than lithium ion batteries due to their lower initial costs. The calculation can predict the cost- effectiveness of a solar system with energy storage and therefore help to find the bestbattery sizefor a certain household