Are Home Batteries Worth It?

A home battery costs $9,000 to $16,000 installed, and there is no federal tax credit for one in 2026. So the question is blunt: does it ever pay for itself? Without net metering, the answer is sometimes, and the math depends entirely on your utility rate structure.

The three ways a battery earns

Forget payback calculators for a minute and think about what the battery physically does. It buys low and sells high, using your own solar as the inventory. The three revenue streams:

1. Time-of-use (TOU) arbitrage. Many utilities now charge far more for evening electricity (4-9 PM) than for midday power. The battery charges from your panels at midday (when power is cheap) and discharges in the evening (when it is expensive). Every kWh shifted saves the rate difference.

2. Self-consumption under poor export rates. Where net metering is gone or gutted, exporting surplus solar earns pennies. Storing it and using it yourself avoids buying grid power at full retail. The worse your export rate, the more each stored kWh is worth.

3. Backup during outages. Not a revenue stream, but real economic value: spoiled food avoided, hotel nights skipped, work-from-home days saved, medical devices kept running. We will price this separately because it is personal.

Note what is missing: with full retail net metering (every exported kWh credited at the full retail rate), the grid is already a perfect free battery, and a home battery earns almost nothing. That is why the question specifies “without net metering.” The battery’s economics live or die on rate design.

Time-of-use arbitrage, worked example

Let us run honest numbers. Take a California-style TOU rate: $0.25/kWh off-peak (midday), $0.55/kWh peak (4-9 PM). A 13.5 kWh battery cycles 10 usable kWh daily through the evening peak (leaving reserve and accounting for efficiency).

Daily savings: 10 kWh x ($0.55 – $0.25) = $3.00 per day. Annual: $3.00 x 365 = $1,095 per year. Against a $13,000 installed battery, that is roughly a 12-year simple payback, before counting any export-credit improvement or backup value.

Now a milder TOU rate, common in Texas and the Southeast: $0.12 off-peak, $0.22 peak. Same 10 kWh shifted: 10 x $0.10 = $1.00/day, or $365/year. Payback stretches past 30 years on arbitrage alone. The rate spread is everything. Before buying, pull your utility’s actual TOU schedule (not the marketing summary) and do this exact multiplication. If your utility does not offer TOU rates at all, arbitrage earns zero.

One more lever: some utilities pay battery owners directly through virtual power plant or bring-your-own-battery programs, dispatching your battery during grid emergencies for $100 to $400+ per year. These programs are patchy but growing; check DSIRE for your state.

Self-consumption under bad export rates

The second revenue stream matters most where exports are nearly worthless. Under NEM 3.0-style rules, exported solar might earn $0.04 to $0.08/kWh while imported evening power costs $0.40 to $0.55. Every kWh you store and self-consume instead of exporting is worth the spread: roughly $0.35 to $0.50.

A household that shifts 10 kWh daily from export to self-consumption at a $0.40 spread saves $4.00/day, or about $1,460/year. Combined with TOU arbitrage (these often overlap in practice; do not double-count), the battery starts looking like a 9 to 12 year payback in the best territories.

Compare that to a state with traditional net metering still intact: exports credited at retail, no TOU spread. The battery’s daily value collapses to near zero, and payback is effectively infinite on economics alone. This is not a battery problem; it is a rate-design outcome. Our AC vs DC coupling guide and battery comparison cover the hardware side once the math says yes.

California NEM 3.0: the special case

California deserves its own section because it is the largest US solar market and the clearest case where batteries approach necessity. Under NEM 3.0 (in effect since April 2023), exported solar earns roughly 75 percent less than under NEM 2.0, while evening import rates stayed high. The Department of Energy and California’s own analyses show solar-only paybacks stretching toward 9+ years under NEM 3.0, while solar-plus-battery systems that maximize self-consumption land notably better.

The mechanism: a battery lets you avoid exporting at $0.05 and importing at $0.50. That $0.45 spread, applied to 10+ kWh daily, is $1,600+/year in avoided costs. It is the single best battery market in the country on pure economics. Add SGIP rebates where funding remains, and California is the one state where “the battery pays for itself” is a defensible claim rather than a sales pitch.

Payback scenarios by utility type

These are modeled examples, not promises. Your numbers depend on your rate schedule, your evening usage, and how aggressively the battery is programmed. Get the installer’s savings estimate in writing with the rate assumptions shown, then verify the rate schedule yourself on your utility’s website.

Pricing the backup value honestly

Most battery buyers are not doing arbitrage math; they are buying outage protection. Price it like insurance. What does a multi-hour outage cost you? A fridge of spoiled food ($200+), a hotel night ($150), a lost workday ($200+), a sump pump failure (thousands). If you lose power three times a year and each outage costs you $300 in real losses and hassle, that is $900/year in backup value, which transforms the payback table above.

Be honest with yourself, though. If your grid is reliable and outages are a once-every-three-years inconvenience, the backup value is small and you should not use it to justify the purchase. The battery is still a fine luxury; just call it that. Our technical outage explainer and practical blackout guide cover what batteries actually do when the grid fails.

Battery chemistry affects how long the asset lasts, which feeds directly into payback: an LFP battery with a 12-year warranty has more years to earn. See our LFP vs NMC guide for why chemistry matters here.

The verdict

Do home batteries pay for themselves without net metering? In California-style rate territories with big TOU spreads and poor export credits: often yes, in roughly 7 to 12 years, plus backup value. In moderate TOU territories: maybe, on a 12 to 20 year view that needs the backup value to close the gap. On flat rates with no net metering: rarely on economics alone. With full retail net metering intact: no, buy it only for backup.

The decision rule is simple: pull your utility’s rate schedule, multiply the peak/off-peak spread by the kWh you can shift daily, multiply by 365, and divide into the installed cost. If the answer is under 12 years, the economics work. If it is over 20, you are buying peace of mind. Both are valid purchases; only one of them is an investment.