An energy storage system is a device that is used to store power for future consumption. Energy storage systems for solar power store the surplus energy generated by solar panels when the energy produced is more than the energy used right away for solar electricity. The energy stored may subsequently be utilized at night, when it is cloudy or when there is a high demand for power. Energy storage systems generally include batteries, power conversion equipment, energy management software and monitoring technology. These parts together work efficiently to charge, store and discharge electricity. 

The main purpose of energy storage systems for solar power is to enhance energy availability and to decrease dependency on external power sources. With storage devices, the user may store the unused solar energy for later use, rather of feeding it back to the grid. Modern storage systems have seen remarkable advancement in recent years in terms of efficiency, capacity, longevity, and safety. 

These advances have made it more feasible and less expensive to store energy for solar projects of residential, commercial, industrial and utility size. This means that energy storage devices are an increasingly important aspect of renewable energy infrastructure globally.