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BATTERY / CONSTANT LOAD RUNTIME

Battery Backup Runtime Calculator

Estimate backup hours and minutes from battery voltage, amp-hours, usable discharge, conversion efficiency, and constant load.

  • 01 Calculated in this tab
  • 02 Values stay in this browser tab
  • 03 Use boundary

Conversion input

Known value

Filter by unit name, symbol, or code. Your current selections remain available.

Operating inputs

Efficiency assumptions

Operating inputs

Preparing the calculator...

Use boundary

Calculation path

Volts times amp-hours creates nominal Wh; usable fractions reduce it before division by constant load watts.

Calculation path

Runtime hours = voltage x amp-hours x depth of discharge x efficiency / load watts.

What you provide

What you provide

  • Battery voltage: Nominal battery or bank voltage.
  • Battery capacity: Rated amp-hour capacity at the relevant discharge conditions.
  • Usable depth of discharge: Planned share of nominal capacity used.
  • Delivery efficiency: Battery and conversion efficiency from stored energy to load.
  • Constant connected load: Average active power drawn during backup.

What you receive

What you receive

  • Estimated runtime hours and minutes
  • Usable stored energy
  • Nominal battery energy

Use boundary

Choose the maximum decimal places shown. This does not increase source accuracy.

Peukert effect, voltage sag, cutoff, temperature, battery age, startup surge, and changing load can shorten runtime.

This is an educational planning result, not a structural, electrical, thermal, solar, battery, generator, or safety design. Confirm specifications, units, codes, and professional requirements before acting.

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