SpecCalc Hub · Medium
UPS Runtime Calculator
Estimate UPS runtime from battery configuration, load, efficiency, and usable capacity.
Formula
battery_wh = voltage * Ah * count usable_wh = battery_wh * usable_capacity * efficiency runtime_hours = usable_wh / load_w load_percent = load_w / (VA * PF) * 100
Assumptions
- Inputs are user-provided.
- Results are preliminary estimates.
- Battery is healthy and load is constant.
Limitations
- Manufacturer runtime curves may differ significantly.
Methodology
Uses battery Wh adjusted by usable capacity and efficiency.
This calculator provides an estimate for informational purposes only. It is not a certified engineering design, electrical safety approval, or professional installation recommendation. Always verify final decisions with a qualified professional and applicable local codes.