BACKUP POWER / UPS

UPS Runtime Calculator

Estimate UPS runtime from battery-bank count, voltage, amp-hours, usable discharge, inverter efficiency, and connected load.

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

Use boundary

Calculation path

Nominal battery Wh is reduced by discharge and inverter fractions, then divided by steady connected watts.

Calculation path

Runtime = battery voltage x Ah x battery count x usable depth x inverter efficiency / load watts.

What you provide

Battery voltage: Nominal voltage of each represented battery contribution.
Battery amp-hours: Rated capacity for each represented battery.
Battery count: Number of equal batteries contributing to modeled bank energy.
Usable depth of discharge: Share of nominal energy allowed before shutdown.
Inverter efficiency: Share of usable DC energy delivered to AC load.
Connected load: Average active load during outage operation.

What you receive

Estimated UPS runtime
Runtime in minutes
Usable and nominal bank energy

Use boundary

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

Battery series/parallel topology, UPS DC bus requirements, load power factor, surge, cutoff, aging, and temperature require verification.

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.

UPS Runtime Calculator

Calculation path

What you provide

What you receive

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

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