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Battery Backup Calculator for UPS Sizing

Use this GEESYS calculator to estimate the recommended UPS capacity and battery requirement for your connected load. Enter the total load in watts, expected backup time, and power factor to get a quick planning value.

This tool is useful for homes, offices, server rooms, retail spaces, and industrial control loads where backup time and UPS sizing need to be estimated before final product selection.

Enter Load Details

Enter the total connected load in watts.
Enter the required battery backup time in hours.
Typical planning range is 0.7 to 0.9 depending on load type.

Estimated Result

Recommended UPS Capacity -
Battery Requirement -

Results will appear here after calculation. Final battery-bank voltage, battery type, discharge limits, and inverter efficiency should be validated before procurement.

Calculation Notes

  • Recommended UPS capacity is estimated using `load / power factor` with a `20%` sizing margin for practical selection.
  • Battery requirement is shown as the approximate energy needed in `Wh` and `kWh` based on `load x backup time`.
  • This is an early-stage planning tool. Final selection should consider load growth, battery efficiency, depth of discharge, inverter losses, and site conditions.
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