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# The Economics of Home Solar Batteries

A home battery storage system typically costs **$10,000–$20,000** installed before incentives. More precisely, a 10 kWh system runs $10,000–$13,000, while a 13.5 kWh system costs $12,000–$16,000—translating to roughly **$800–$1,300 per usable kilowatt-hour**. Most residential batteries fall in the 9.6–13.6 kWh range, though modular systems can be scaled in 5 kWh increments.

## Performance and Lifespan

Modern lithium batteries deliver **95–100% depth of discharge** and last 10–15 years. Round-trip efficiency—energy out versus energy in—reaches 85–92% for AC-coupled systems and 95–97% for DC-coupled systems. Warranties typically run 10 years, guaranteeing roughly 70% capacity retention, with cycle limits of 6,000–10,000 cycles or a defined throughput threshold (for example, 37 MWh lifetime). Ongoing maintenance costs are effectively zero, but budget for an **inverter replacement of $1,500–$2,500** at the 10–15 year mark, and expect battery replacement to run 60–80% of the original installed cost.

## Payback and Savings

Payback period depends heavily on your utility's policies. Under flat-rate pricing with true 1:1 net metering, a battery rarely pays back on its own—the economics are essentially infinite. Switch to **time-of-use (TOU) rates**, and payback shrinks to 8–14+ years. In markets with reduced export compensation—such as California’s NEM 3.0—a combined solar-plus-storage system can pay back in **6–9 years**.

## Incentives and Additional Revenue

The **federal Investment Tax Credit (ITC)** covers 30% of installed costs through 2032 for batteries larger than 3 kWh. State programs add further savings; California’s SGIP rebate, for instance, offers $150–$1,000 per kWh. Enrolling in a **virtual power plant (VPP)** program can generate an additional $100–$1,000+ annually by allowing the grid to draw on your stored energy during peak demand.

## Bottom Line

Whether a battery makes financial sense turns on your net metering policy, electricity rates, TOU structure, solar self-consumption rate, any peak demand charges, and local grid reliability concerns. In high-rate, export-restricted, or grid-stressed markets, the math is increasingly compelling.