Results
Enter inputs above, then tap Calculate.
Method and assumptions
Peukert and temperature derating not applied - add for final sizing.
Battery and UPS capacity
Estimate battery capacity from load, runtime, efficiency and depth of discharge.
Energy-based amp-hour estimate with entered efficiency and depth of discharge. Peukert, ageing and temperature effects are not modelled.
Related calculators
Check the stated method and limits against your installation. Results are calculation aids, not certification.
Calculator guidanceNew calculator emails
Calculation model 2026-11-02.1