The biggest challenge faced by users of renewable energy sources is its rational use. The characteristic feature of energy supplied from RES is its considerable variability, which can have a destabilising effect on the power grid. For this reason, a crucial role is played by energy storage facilities.
Energy storage systems allow to store the surplus energy generated during peak production times and release it during periods of less favourable production output (increased cloud cover, less wind, etc.), as well as they allow to supply energy to the grid in a stable manner.
Their equally important quality is the fact that they allow to avoid costly investments. When due to the development of an enterprise or of any other area with a demand for electric energy the demand for energy increases, it may be necessary to increase the connection power (increased levels of energy consumption occur in short time intervals). Such a situation may entail increased operating costs due to penalties (exceeding the contracted capacity) or due to the need to rebuild the power connection. It should also be taken into account that such redevelopment is not always possible. In such a situation, an energy storage system seems to be the best solution.