UPS runtime calculator

UPS Runtime Calculator For Battery Autonomy RFQs

Estimate UPS capacity and battery energy from critical load, runtime target, efficiency, reserve, and usable depth of discharge.

UPS SystemDC Power SystemBESSRFQ estimate

Answer First

A UPS runtime calculator turns critical load and autonomy target into a supplier-ready battery energy estimate. Use it to compare UPS capacity, runtime, battery assumptions, and redundancy before requesting quotes.

Interactive estimators

RFQ-ready sizing prechecks

Use these as procurement estimates for early supplier discussions. Final design, protection, code compliance, and manufacturer selection still need qualified engineering review.

Critical load

Runtime target

min

Growth reserve

Inverter efficiency

Usable depth of discharge

Aging reserve

UPS systemBattery autonomy estimate

600 kW

Protected load

600 kW

UPS capacity

0.3 hr

Runtime

217.1 kWh

Battery energy

Use in RFQ

Results are estimates for supplier conversations, not final equipment selection.

Inputs To Have Ready

Critical load in kW

Runtime target in minutes

Growth and aging reserve

Inverter efficiency

Usable battery depth of discharge

Outputs For The RFQ

Protected loadSelected UPS capacityRuntime hoursRequired battery energyRFQ assumptions for supplier review

Calculator FAQ

Visible answers are mirrored into FAQPage schema for search snippets.

What inputs affect UPS runtime most?

Critical load, target minutes, battery depth of discharge, inverter efficiency, aging reserve, and redundancy model usually drive runtime and battery size.

When should a long UPS runtime become a BESS discussion?

Runtime above roughly one hour often deserves a parallel BESS or generator-backed autonomy comparison because battery footprint, safety, cost, and controls change materially.

What should be included in a UPS RFQ?

Include kW/kVA load, runtime target, battery chemistry, redundancy, bypass requirements, monitoring, site voltage, service expectations, and commissioning scope.