UPS Battery Calculator

Estimate required battery Ah using target runtime, load, and battery voltage.

Quick UPS Battery Calculator

Quick mode estimates battery Ah from default practical assumptions and gives a fast target for preliminary sizing.

Advanced UPS Battery Calculator

Load (kW)

Target Runtime (minutes)

Battery Voltage (V)

Result Explanation

Battery Ah requirement depends on load, target runtime, and DC voltage assumptions. Apply engineering margin for aging, temperature, and discharge limits.

Next Step: Validate UPS Runtime Use UPS Capacity Calculator

Example

Example: 2 kW target load for 30 minutes at 48 V often requires battery Ah above nominal arithmetic values after applying efficiency and reserve margins.

Related Tools

UPS Hub

See complete planning workflow in UPS Calculators Hub.

FAQ

How is required battery Ah estimated?

It is estimated from load power, target runtime, and battery voltage, with practical engineering assumptions.

Why does higher voltage reduce required Ah?

Higher battery voltage provides more watt-hours per Ah, so the Ah requirement drops for the same load and runtime.

Should I include aging margin?

Yes. Add margin for battery aging, temperature effects, and desired discharge limits to avoid runtime shortfall.