Home energy storage battery capacity indicates the total electric energy that can be stored in a battery, which is measured in kilowatt-hours (kWh). Different battery capacities are available for different purposes. Some may only power essential appliances during short outages while others can cover an entire home’s power consumption for long periods. Batteries with higher capacity will store more energy, but may also be larger, more expensive, and take up more space. Homeowners should consider their average daily energy usage, backup needs, and budget to optimize energy capture and utilization.