Solar batteries typically cost $10,877 after the federal tax credit—which expires for batteries installed after December 31, 2025—for the 13. 5 kilowatt-hours (kWh) of storage a typical home needs to keep essential devices running during outages (also the size of a Tesla Powerwall. . A solar battery costs $8,000 to $16,000 installed on average before tax credits. Solar battery prices are $6,000 to $13,000+ for the unit alone, depending on the capacity, type, and brand. Jump ahead: Is solar battery worth the cost? Why are solar batteries so expensive? Let's dive right in with the big question: How much do solar batteries cost in 2026? What is the. . The cost of installing a battery storage system varies based on capacity, installation complexity, and equipment needs. You may need multiple batteries to power your whole house with solar batteries.