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Home Battery Life Expectancy Calculator

How many years a home battery will last under your duty cycle — cycle wear vs calendar aging.

"How long will it last?" is the only battery question that matters to homeowners with solar + storage. A solar-charged home battery typically completes one full cycle a day; LFP units like Powerwall 3-class hardware are warranted ~70% at 10 years. Pre-set to a typical home battery duty cycle, this tool runs the DoD-corrected cycle math against calendar aging and reports the binding constraint — change cycles/day and DoD to match your operation.

4,383 cycles
Expected cycle life (to 80% capacity)
12.0 years
Service life
cycling
Limited by
Datasheet rating4,000 cycles @ 90% DoD
DoD stress exponent1.6
Calendar-only life13 yr to 80%
Energy throughput3,726 × capacity kWh

Cycle life scales as (rated DoD ÷ your DoD)^1.6 for LFP (LiFePO₄). Whichever of cycling wear or calendar aging hits 80% first sets the real service life — lightly-cycled packs die of old age, hard-cycled packs die of throughput.

Sources: Cell datasheet cycle curves (DoD inverse-power fit); Sandia / NREL battery aging test reports

Engineering estimate from published standards and typical equipment data. Site conditions, equipment datasheets and measured data govern the real result — confirm with a qualified engineer.

Use the free Home Battery Life Expectancy Calculator online — How many years a home battery will last under your duty cycle — cycle wear vs calendar aging. Runs instantly in your browser: no signup, no upload, mobile-friendly.

About Home Battery Life Expectancy Calculator

"How long will it last?" is the only battery question that matters to homeowners with solar + storage. A solar-charged home battery typically completes one full cycle a day; LFP units like Powerwall 3-class hardware are warranted ~70% at 10 years. Pre-set to a typical home battery duty cycle, this tool runs the DoD-corrected cycle math against calendar aging and reports the binding constraint — change cycles/day and DoD to match your operation.

How to use Home Battery Life Expectancy Calculator

  1. 1Pick the chemistry (or keep the application's default).
  2. 2Enter your typical depth of discharge and cycles per day.
  3. 3Read expected cycles, service years, and which aging mechanism retires the battery.

Why use Home Battery Life Expectancy Calculator?

  • ✓DoD inverse-power law — the actual shape of manufacturer cycle-life curves
  • ✓Shows the binding constraint: cycling wear vs calendar aging
  • ✓Energy-throughput output for warranty and TCO comparisons
  • ✓All chemistries, one tool — compare LFP vs lead vs flow in seconds

Frequently asked questions

How does depth of discharge change battery cycle life?+

By a power law: halving DoD roughly triples Li-ion cycle count. An NMC pack rated 2,000 cycles at 85% DoD delivers ~5,500 cycles at 50%. This is why oversizing a battery (cycling it shallower) often costs less per delivered kWh over a decade.

Why might my battery die of old age before cycle wear?+

Calendar aging runs regardless of use — typically 1.5–2.5%/yr for Li-ion, worse when hot or stored full. A lightly-cycled backup battery (0.1 cycles/day) hits 80% from calendar fade in 8–13 years no matter how few cycles it saw. The tool shows which clock runs out first for your duty.

Which battery chemistry lasts longest?+

By cycle count: LTO (15,000+) and vanadium flow (12,000+, DoD-insensitive) lead; LFP (3,000–6,000) is the practical champion for cost; NMC/NCA (1,500–2,500) trade life for energy density; lead-acid (400–1,200) trails but is cheap upfront. Match chemistry to your cycling intensity.

What is energy throughput and why do warranties cap it?+

Throughput = capacity × DoD × cycles — the total energy a battery moves over its life. Warranties increasingly cap MWh throughput because it captures wear better than years or cycle counts alone. Compare price ÷ throughput across chemistries for the honest cost-per-kWh-delivered.

Embed Home Battery Life Expectancy Calculator on your website

Want Home Battery Life Expectancy Calculatoron your own site? Paste this snippet into any HTML page — it's free, with no API key or sign-up. The tool loads in an iframe and keeps working exactly as it does here.

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