BESS prove particularly useful in conjunction with renewable energy systems, such as photovoltaic or wind power, which have peak generation times that are not necessarily synchronized with the users' needs. With these devices, it is therefore possible to store surplus electricity and then allow it to be used or fed into the grid when needed. They can be used in small-scale, residential, so-called "behind the meter" solutions, for example in conjunction with domestic renewable systems, or in large-scale solutions that are directly connected to the distribution or transmission grid.