Quick Notes
Assumptions
This calculator uses simplified engineering estimates for quick planning.
• Watts, amps, and volts follow the basic single-phase relationship P = V × I × PF.
• UPS runtime is estimated from battery energy, UPS efficiency, and usable battery fraction.
• Battery discharge curves here are planning curves, not manufacturer-certified curves.
• Real-world runtimes and terminal voltages vary with temperature, battery age, discharge rate, inverter losses, and cut-off settings.
• For critical systems, verify against the UPS vendor data sheet and the battery manufacturer discharge tables.