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Usable capacity after depth-of-discharge
Find the usable capacity of a battery after applying the safe depth of discharge for its chemistry. Lead-acid is typically 50%, LiFePO4 around 80%.
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Looking for a definition or a quick answer? See the solar & battery glossary for terms used on this page, or the FAQ for common sizing questions.
Sources & standards
- IEEE 1013 — Recommended Practice for Sizing Lead-Acid Batteries for Stand-Alone Photovoltaic Systems — Widely used engineering practice for days-of-autonomy and depth-of-discharge sizing methods, referenced here for the general sizing approach.
- IEC 62619 — Safety Requirements for Secondary Lithium Cells and Batteries for Industrial Applications — International safety-testing standard for LiFePO4 and Li-ion (NMC) cells used in stationary storage.
- IEC 60896 — Stationary Lead-Acid Batteries (test & performance requirements) — International test standard covering VRLA (AGM/gel) and flooded stationary lead-acid batteries.
Estimates for planning only. Verify with a meter and follow NEC / local code; have a licensed installer confirm any system before purchase or wiring. See the methodology for formulas and sources.