Home battery calculator

Shift cheap electricity to peak hours and estimate payback. Change only the numbers you know. Results update instantly and stay in this browser.

01 · A useful example is ready

A useful example is ready

Currency and regional example

Battery capacityEditable average

kWh

Usable battery capacityEditable average

Full equivalent cycles per yearEditable average

Installed battery priceEditable average

USD

Cheap electricity priceEditable average

USD

Peak electricity priceEditable average

USD

Round-trip efficiencyEditable average

03 · Every result explained

Each row says what the number represents. No hidden total: the editable starting values are listed beside it.

ResultWhat this number meansValue

Energy shifted per yearElectricity the battery can deliver during the selected yearly use.2,700 kWh

Estimated saving per yearDifference between the value of expensive-hour energy and cheap charging cost.$407.70

Simple paybackApproximate time for accumulated benefit to equal the system price.18 years

15-year benefit after battery priceEstimated 15-year battery benefit after subtracting the installed price.-$1,234.50

04 · What the estimate includes

The estimate includes usable battery capacity, yearly use, energy losses, cheap charging price, expensive-hour value and installation cost.

ⓘ Planning estimate — not a quote, tariff or financial recommendation.

Does this include backup value?

No. Resilience during outages can be valuable but is not assigned a cash value here.

Can a battery earn other revenue?

Some markets pay for grid services, but availability and contracts differ by location.

Optional partner services

No pop-ups and no promises of easy money. Life in Numbers's calculators remain free.

Partner links: Life in Numbers may receive a reward if you use them. Your price does not increase.

Crypto can lose value. Check availability and rules in your country. This is advertising, not financial advice.