A 10 kWh battery cycling most of its capacity daily displaces roughly 8-9 kWh of evening grid use, worth around $2.30-$2.50 a day, or roughly $850-$900 a year. $10,500 ÷ ~$875 a year ≈ 12 years on the battery alone in a conservative case, or closer to 7-10 years for households with strong evening usage that cycle the battery more fully. Homes using around 10-20 kWh a day are the sweet spot for a 10-13.5 kWh battery. Frequently asked questionsIs a home battery worth it if I already have solar? Is a battery worth it if I use most of my power during the day?