UPS autonomy period, by dividing the available battery energy by the load It is found as: Energy = V × Ah × string × (DoD/100) × efficiency; time = energy / load. For example, with a 20 kW load and a 384 V/100 Ah battery, approximately 80 minutes of autonomy is obtained.

Energy = V·Ah·string·(DoD/100)·efficiency · Time = Energy / Load
Example calculation: 20 kW yük, 384 V / 100 Ah batarya, DoD %80, verim %90 → kullanılabilir ≈ 27,6 kWh; otonomi ≈ 83 dakika (yaklaşık; gerçek değer deşarj testiyle doğrulanır).

UPS Battery Autonomy Time

Calculate the approximate power supply (autonomy) time of the UPS based on load and battery information.

Approximate autonomy
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Battery power
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Notes: Available energy = V × Ah × string × (DoD/100) × efficiency; time = energy / load. This is an approximate value. — Capacity drop at high current (Peukert effect), battery age and temperature have not been taken into account. Actual autonomy is verified by battery test/discharge measurement.
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How is it calculated?

  1. Enter the load (kW).
  2. Enter the battery DC voltage (V), capacity (Ah), and string count.
  3. Click Calculate with DoD and yield percentage.

Frequently Asked Questions

How long does the UPS provide power?
Available battery energy is found by ÷ load; energy depends on battery voltage, capacity (Ah), number of strings, and depth of discharge (DoD).
What is the Peukert effect?
High discharge currents reduce the usable capacity of the battery; actual autonomy may be shorter than anticipated.
How is autonomy verified?
Battery discharge (autonomy) test measures the lifespan; battery age and temperature affect it.

Related tools and services

This tool and its content are for general informational purposes only; they do not constitute a binding inspection/declaration of conformity. Definitive results will be determined through on-site inspection in accordance with relevant legislation and standards. Get a quote →