Implications of Residential Battery Charge and Discharge Rates on Self-consumption and Peak Power Exchange

Coupling batteries with photovoltaic generators in buildings can improve the building's self-consumption and reduce its reliance on the grid. To quantify the effects of different battery charge/discharge rates on self-consumption and peak power exchange, four grid impact indicators have been analyzed - self-sufficiency rate, self-consumption rate, loss-of-load probability and peaks above limit. The analyses were performed for two households, using datasets 1-minute and 1-hour time steps. The results indicate that low charge/discharge rates have a negative effect on self-consumption and little to no effect on peak power exchange. It was also found that the first three indicators can be calculated with a reasonable accuracy when data with 1-hour time steps are used. High resolution data is necessary for the accurate calculation of the last indicator.