Guide
A home battery is usually worth it in two cases: you want backup power during outages, or you live under time-of-use rates or net billing like California's NEM 3.0, where storing your own solar to use in the evening beats exporting it for pennies. Under full retail net metering, a battery usually lengthens your payback, because the grid already acts as a free bank for your surplus power at full price. Be honest with yourself about which case you are in before adding one.
Home batteries are priced by usable capacity in kilowatt-hours (kWh). Installed prices commonly run around $1,000 to $1,300 per kWh, so a typical 10 to 14 kWh unit lands roughly in the $12,000 to $16,000 range before incentives, and multi-battery setups cost more. That is a large addition on top of the panels. The good news: since 2023, both solar-paired and standalone storage qualify for the 30% federal Residential Clean Energy Credit (26 U.S.C. §25D), which takes a real bite out of the net price. Some states and utilities add storage-specific rebates, tracked in DSIRE.
The financial case is strongest where a kWh you export is worth much less than a kWh you use. Under California's NEM 3.0, exported solar earns a low wholesale-style rate while grid power at night costs full retail, so charging a battery during the day and discharging it at night lets you self-consume power that would otherwise be sold cheap. The same logic applies under steep time-of-use rates with expensive evening peaks. In these markets the battery is not just backup, it is arbitrage against your own rate schedule, and it can meaningfully improve the economics of a new solar system. See our explainer on net metering and NEM 3.0 for why this matters so much.
If you lose power often, or an outage is genuinely costly (medical equipment, a home office, a freezer full of food, a well pump), a battery buys resilience that a grid-tied solar array alone cannot. Standard grid-tied solar shuts off during an outage for safety; only a battery (or a specific backup-capable inverter setup) keeps your lights on. This value is real but hard to put in a payback formula, so treat it as a benefit you are choosing to buy, like a generator, rather than an investment that pays itself back in bill savings.
Under full retail net metering, the grid already credits every exported kWh at the same price you pay, so it functions as a lossless, free battery. Adding a physical battery in that setting mostly adds cost without adding much savings, and round-trip efficiency losses (a battery returns roughly 85 to 90% of what you put in) work against you. In that case a battery lengthens payback and is worth it only for the backup value above.
| Your situation | Battery worth it? | Why |
|---|---|---|
| Full retail net metering, few outages | Usually no | Grid already banks exports at full value; battery adds cost |
| NEM 3.0 / net billing (e.g. California) | Often yes | Self-consumption is worth far more than low export rates |
| Steep time-of-use rates | Sometimes | Shift solar into pricey evening peak hours |
| Frequent or costly outages | Yes, for resilience | Keeps critical loads running; value is backup, not payback |
Key takeaway: in most cases a battery lengthens your solar payback rather than shortening it. It earns its place when you live under NEM 3.0 or time-of-use rates, or when backup power is worth real money to you. If neither is true, put your budget into panels first.
Should I add a battery now or later?
If your state has full net metering today, many homeowners install panels now and add storage only if the rules change or their needs do. Retrofitting a battery is common, though a combined install can be slightly cheaper and simpler. If you are under NEM 3.0, sizing panels plus a battery together from the start usually makes more sense.
A battery changes the numbers, so model it against your own rate. See how the payback period works, whether solar alone is worth it for you, and how the federal tax credit applies to storage. Full detail is in our methodology.
The report models the panel system against your state's net-metering rules, so you can see the base case before deciding whether storage is worth adding. An independent estimate, not a quote.
