Home Battery Cost & Payback Calculator — 2026

Prefilled with the low end of the research-reported range only. Source below.

Prefilled with the high end of the research-reported range only. Your installer quote — not this range — is the price that matters for your home.

Prefilled with the research example only: ~$797/year at the research calculator's defaults for one unit on bill-shifting alone (source below). This is NOT your home's saving. Replace it with your own bill / rate / usage maths, or leave the field as an example and say so.

TODO — do not fill this from a blog. Enter a programme payment ONLY if the official programme page for your exact state and utility states it, and record the programme name, rate, and check date in the box below before publishing. Research example for context only (not a filled rate): in MA/RI/CT, ConnectedSolutions demand-response was reported at about $1,125–$1,375/year — see the worked example. That example does not mean your utility pays that amount.

If checked, this calculator does NOT calculate a lease saving. Lease / PPA saving under the business §48E credit depends on how that specific contract is priced — ask the provider for the full written lease price and terms. Research note for context only: one reported §48E lease case cut effective cost to ~$9,100 (source below). That is a single reported example, not a general lease price, and it is not applied automatically here.

Total installed cost (low) = Units × Cost per unit (low)

Total installed cost (high) = Units × Cost per unit (high)

Net cost = Total installed cost − Federal credit ($0 in this calculator for homeowner-owned 2026 installs)

Annual benefit = Annual bill savings + Annual programme payment (if confirmed)

Simple payback (years) = Net cost ÷ Annual benefit

Simple payback ignores: electricity price changes, degradation, maintenance, replacement, financing interest, and the value of backup during an outage (which has no single dollar price). If annual benefit is $0, payback cannot be calculated — the calculator says so instead of showing an infinite number.

Bill-shifting alone, 1 unit: Cost $12,000–$16,000 ÷ $797/year = 15.1–20.1 years on the ends of the range. The research's own summary at its calculator defaults is ~17 years — inside that range, at its defaults, not at every price in the range. Do not quote 17 years as your home's payback.

Bill-shifting + programme example, 1 unit, using the ends of both reported ranges: Annual benefit $797 + $1,125 = $1,922 (low programme end) to $797 + $1,375 = $2,172 (high programme end). Payback: $12,000 ÷ $2,172 = 5.5 years (cheapest cost + highest programme payment) to $16,000 ÷ $1,922 = 8.3 years (most expensive cost + lowest programme payment). The research's own summary for the MA/RI/CT ConnectedSolutions case at its defaults is ~6–8 years — again, at its defaults, not a promise for your utility.

The honest line from the research, in full: on bill savings alone a battery rarely pays back quickly (the Start Pack records 12–17+ years in the research sources for bill-savings-only cases); the buyer is buying backup + rate arbitrage + programme payments, not an investment return.

Last checked for this prototype: Research reports dated 4 November 2026. This prototype has NOT been re-checked against live utility / commission / installer pages. Do not publish until the TODOs below are filled.

• Installed cost per 13.5 kWh unit: roughly $12,000–$16,000 installed in 2026 — research report, citing https://greenenergycalc.com/calculators/battery-storage/ and https://nuwattenergy.com/en/battery-storage-cost-2026
• Bill-shifting example: ~$797/year for one unit at calculator defaults — research report, citing https://nuwattenergy.com/en/solar-battery-worth-it-2026
• ConnectedSolutions example: about $1,125–$1,375/year in MA/RI/CT — same NuWatt source via the research report. This is an example, NOT a filled rate for any reader's utility.
• Lease example: ~$9,100 effective cost in one reported §48E lease case — same NuWatt source via the research report. Single example only; lease saving depends on contract pricing.
• State programme payment for YOUR state/utility: TODO — leave at $0 in the calculator until you have: programme name, official programme page URL, rate, eligibility rule (utility, address, system size), and check date. Re-check quarterly — programme rates are set by commissions/utilities and move without a national announcement.
• State pages to check first (from the Start Pack): MA, RI, CT, CA, TX, FL — each state needs its own programme table. Never copy one state's rate onto another state's page.
• Federal credit: $0 for homeowner-owned 2026 installs — see the top box. §25C (heat pumps, panel upgrades, audits) also ended on the same date, per the research report.

Why is the federal credit $0 in this calculator?

Because the 30% §25D credit does not apply to homeowner expenditures made after 31 December 2025. A lease / PPA under §48E is different and depends on the contract price — this calculator does not calculate a lease saving.

Why is payback so long on bill savings alone?

At the research example of ~$797/year for one unit, $12,000–$16,000 ÷ $797 gives 15.1–20.1 years. Programme payments, peak-rate arbitrage, and backup value change that picture — but only where a programme rate is officially confirmed for your utility.