The amount of electricity stored typically ranges from 5 to 20 kWh for residential systems, and larger commercial systems can hold significantly more, up to several megawatt-hours. . Energy storage cabinets are devices that can store electricity for later use, with varying capacities depending on the technology and design used. Do you need a system to cover peak demand times, provide full backup during. . The secret often lies in energy storage power cabinets – the unsung heroes of modern electricity management. Let's crack open these technological marvels. In addition to power requirements, think about how long you need the energy to last.