Battery runtime scenario
Engineering / FREE CALCULATOR
Estimate runtime from usable energy and a constant load.
Your answer starts here.
Enter your values and select Calculate to see the result and any available breakdown.
How to use this calculator
- Enter nominal stored energy (wh). Use the unit shown beside the field.
- Enter usable energy (%). Use the unit shown beside the field.
- Enter constant load (w). Use the unit shown beside the field.
- Select Calculate and review the result. Select Reset to restore the example inputs.
How the calculation works
Nominal stored energy (Wh)*Usable energy (%)/100/Constant load (W)
Worked example
Nominal stored energy (Wh) = 120; Usable energy (%) = 80; Constant load (W) = 20. Result: 4.8 hours.
Understand your result
Estimate runtime from usable energy and a constant load. The result is expressed in hours.
Assumptions and limitations
Does not model voltage sag, changing loads or discharge-rate effects. Results are rounded for display.
Questions about this tool
What does this tool calculate?
Estimate runtime from usable energy and a constant load.
What should I check before using the answer?
Does not model voltage sag, changing loads or discharge-rate effects.
Related guides
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