An analysis by the National Renewable Energy Laboratory (NREL) shows that appropriately sized battery-buffered systems can reduce power grid service capacity needs by approximately 50% to 80% compared to a charging station that is powered entirely by the power grid, while offering an. . An analysis by the National Renewable Energy Laboratory (NREL) shows that appropriately sized battery-buffered systems can reduce power grid service capacity needs by approximately 50% to 80% compared to a charging station that is powered entirely by the power grid, while offering an. . Battery energy storage systems can enable EV fast charging build-out in areas with limited power grid capacity, reduce charging and utility costs through peak shaving, and boost energy storage capacity to allow for EV charging in the event of a power grid disruption or outage. Adding battery energy. . To design an effective battery storage system for your EV charging station, you must evaluate several key parameters. These factors determine the capacity (kWh) needed to meet demand while staying cost-efficient. A battery energy storage system (BESS) is an electrochemical device that charges (or collects energy) from the grid or a power plant and then discharges that energy at a later time to. . The worldwide ESS market is predicted to need 585 GW of installed energy storage by 2030. Storing Energy: The BESS charges its batteries using electricity from the grid during off-peak hours or from on-site renewable sources like solar panels.