← All Calculators

Energy & Solar Calculator

Battery Backup Runtime Calculator

Estimate backup duration from battery capacity, voltage and load.

Reset Calculator

About the Battery Backup Runtime Calculator

Estimate backup duration from battery capacity, voltage and load. This online tool is designed to make the calculation easier. Enter the required values above and select Calculate Now to view your result.

How to use this calculator

  1. Enter battery capacity (ah).
  2. Enter battery voltage (v).
  3. Enter connected load (w).
  4. Enter inverter efficiency (%).
  5. Review the values you entered, then select Calculate Now.
  6. Read the result shown on the page. You can print the result if needed.

Frequently asked questions

Is this battery backup runtime calculator free to use?

Yes. You can use this calculator on CalcGenix without paying a usage fee.

Are the results guaranteed?

Results are estimates based on the values and assumptions entered. Check important financial, tax, engineering or other professional calculations with a qualified professional and the relevant official source.

What information do I need?

Complete the input fields shown in the calculator. The labels identify the values required for this calculation.