Home Battery Payback Calculator
Estimate home battery payback and cumulative savings over up to 15 years using your installed cost, daily saving and annual degradation.
A QUICK WALKTHROUGH
How to use this tool
- Enter installed cost and first-year daily saving in the same currency.
- Choose annual degradation and a whole-year horizon up to 15 years.
- Review the payback year and annual cumulative savings.
Calculate simple estimate
Simple undiscounted estimate. Electricity prices and usage stay fixed; savings decline only by your degradation rate. Excludes financing, maintenance, replacement, taxes and incentives.
Cumulative savings
Year n saving = daily saving × 365 × (1 − degradation / 100)^(n − 1). Cumulative saving is the sum of each year.
Daily saving in year 1
Use the same currency for cost and daily saving. Results use that currency; there is no currency conversion.
Inputs and calculations stay in this browser.
Inputs and calculations stay in this browser.
GOOD TO KNOW
Common questions
How is fractional payback calculated?
The fractional payback assumes savings accrue evenly within the first year that recovers the cost. Year 1 has no degradation; a 100% rate leaves no savings after year 1.
Zero daily saving cannot recover a positive installed cost.
No payback within the selected horizon.