A typical solar battery stores around 10 kilowatt-hours (kWh) of energy. To ensure grid independence, you might need two to three batteries to meet your energy usage when solar panels aren't producing power. Common residential storage solutions range between 5 kWh and 20 kWh, making them suitable for typical household energy. . This report is available at no cost from NREL at www. Cole, Wesley, Vignesh Ramasamy, and Merve Turan. Types and Capacities: Common types include lithium-ion (10-20 kWh), lead-acid (4-12 kWh), and saltwater batteries, each. .