Free Home Battery Calculator & Cost Estimator
Enter your battery size and state to instantly estimate your backup hours, installed cost, rebates, and bill savings. Free to use, and no email required.
Home Battery Savings Calculator
Instant estimate — no email required
A typical home battery (e.g. a Tesla Powerwall) is ~13.5 kWh.
15-Year Cumulative Bill Savings
Time-of-use arbitrage only — backup/resilience value is on top of this
Best Portable Power Stations (2026)
Top battery-backup units for outages, compared on capacity, output, 240V support, and price.
The free battery estimator built on real local data
Most home battery estimators hide their numbers behind a lead form. This free calculator does the opposite: it runs instantly in your browser using your local electricity rate, time-of-use price spread, and typical installed cost. Want more detail? Browse home battery cost by state or check battery rebates in your state, or see our picks for the best portable power stations for backup.
How Home Batteries Work
🔋 Backup Power
When the grid goes down, a home battery automatically powers your essentials — fridge, lights, internet, medical equipment. A 13.5 kWh battery typically covers essentials for 12–18 hours; add batteries for longer outages.
💰 Time-of-Use Savings
A battery charges when electricity is cheap (overnight) and discharges during expensive peak hours, shaving your bill. Savings are biggest where the peak-to-off-peak price gap is large — like California — and modest elsewhere.
🏛️ Federal Credit (Expired)
The 30% federal credit that covered home batteries (Section 25D) expired December 31, 2025. Batteries installed in 2026 no longer qualify — but state and utility programs (Connecticut, Vermont, Colorado, Maryland, Hawaii and more) remain.
📈 Should You Buy One?
If you face frequent outages or live in a high time-of-use or strong-rebate state, the math is compelling. If your grid is reliable and rates are flat, a battery is more about resilience and peace of mind than payback.
Free Home Battery Calculator FAQ
Is this home battery calculator really free?
Yes. Our home battery calculator and cost estimator are 100% free — no email, phone number, or sign-up required. Enter your battery size and state to get an instant estimate.
Do I have to enter my email or phone number?
No. The estimator runs entirely in your browser and asks for nothing personal. You only share contact details later if you choose to request quotes from installers.
How accurate is the battery estimator?
It uses real, state-by-state data — your local electricity rate, time-of-use price spread, typical installed cost, and available state rebates. It is a strong planning estimate; a licensed installer confirms exact pricing for your home.
What information do I need to use it?
Just your battery size in kWh and your state. The calculator estimates installed cost, state rebates, backup hours, annual bill savings, and payback.
Does the calculator include the federal battery tax credit?
The 30% federal credit that covered home batteries (Section 25D) expired December 31, 2025, so our 2026 estimates do not assume it. The calculator instead reflects the state and utility battery programs available where you live.
How does the calculator estimate my savings?
It models time-of-use arbitrage — charging when power is cheap and discharging during expensive peak hours — using your state’s peak-to-off-peak spread, then factors in installed cost and rebates to show backup hours and payback.