kWh is a unit of energy measurement kW is a unit of power measurement Capacitors are capable of delivering high levels of power but have relatively small energ

kWh is a unit of energy measurement kW is a unit of power measurement Capacitors are capable of delivering high levels of power but have relatively small energy storage capacity compared to batteries. Grid scale batteries need to be sized in terms of both charge/discharge rates (kW/MW) and energy storage (kWh/MWh)