Battery runtime formula?

Runtime (h) = (Capacity Ah × DoD) / Load Current A

Peukert's law effect?

High discharge reduces effective capacity: C_eff = C × (I/I_ref)^(1-n)

AutoEngCalc - Engineering Calculators

Battery Runtime Calculator

Calculate battery life in hours from capacity (Ah/Wh) and load. Includes depth of discharge (DoD), Peukert effect, inverter efficiency for UPS, solar, EV and portable power systems.

Runtime

8.5 Hours

100Ah battery • 500W load • 80% DoD

Battery Life & Runtime

Featured: Hours • Ah • Wh • DoD • Peukert

Battery Capacity

Battery Voltage (V)

Load Power

Depth of Discharge DoD (%)

Peukert Exponent Lead-acid ~1.2–1.3, Li-ion ~1.05

System Efficiency (%) Inverter/DC-DC losses

Runtime vs Load

Effect of power draw

Key Formulas

Runtime = (Capacity × DoD × η) / Load
Peukert: C_eff = C × (I/I_ref)^(n-1)
Wh = Ah × V

Enter battery and load details

Battery Guidelines

Depth of Discharge

Lead-acid: 50% recommended

AGM/Gel: 80%

Li-ion/LiFePO4: 80–100%

Peukert Values

Flooded Lead-acid: 1.25–1.3

AGM: 1.1–1.2

Lithium: 1.02–1.05

Footer - AutoEngCalc