Engineering planning checklist

Backup Power Load & Battery Runtime Screening

Establish critical three-phase load, screen transformer capacity, and calculate battery runtime and required amp-hour capacity for a declared backup duration.

Use as a checklist, not an automated design workflow. Complete and verify each calculation independently. Only explicit carry-forward links move a compatible value; all other inputs remain your responsibility.

What this workflow covers

Establish critical three-phase load, screen transformer capacity, and calculate battery runtime and required amp-hour capacity for a declared backup duration.

This 3-step checklist is intended for systems engineer. Confirm each linked calculator's units, formula, assumptions and operating limits before using the result in a project decision.

Checklist progress0 of 3 steps checked
Sequence Execution
1

Three-Phase Electrical Power

Calculate real power (kW), apparent power (kVA), reactive power (kVAR), and full-load line current for 3-phase AC systems.

WORKFLOW INSTRUCTION:Establish the measured three-phase real and apparent load for the critical plant bus.
2

Transformer kVA Rating & Load Sizing (IEC 60076)

Scope-limited calculation

Calculate minimum required transformer kVA capacity rating and secondary full-load current based on active load (kW) and power factor.

WORKFLOW INSTRUCTION:Calculate planning-level transformer capacity from active load, power factor, and declared margin; complete protection and harmonics studies separately.
3

Battery Runtime & Backup Capacity

Scope-limited calculation

Estimate battery runtime and required amp-hour capacity from load power, battery voltage, depth of discharge, efficiency, and backup duration.

WORKFLOW INSTRUCTION:Enter the critical AC load and battery-bank assumptions to estimate existing runtime and amp-hour capacity required for the target backup duration.

Target Persona

Systems Engineer
Typical End User