Battery Runtime Calculator
Estimate how long your battery will last running a given load.
About the Battery runtime calculator
Use this battery runtime calculator for van leisure battery & solar setup. Estimate how long your battery will last running a given load.
Enter your battery runtime details
Inverter + cabling losses (≈85–95%).
Tips
If you're running AC appliances through an inverter, drop efficiency to ~85%. Pure DC loads are closer to 95%.
Lithium can use 80–90% of nameplate. Lead-acid should stop at 50% to avoid damage.
Your battery runtime results
Usable energy
960 Wh
80% DoD
Effective load
66.7 W
90% efficient
Runtime
14 h 24 min
14.4 hours
Why battery runtime matters for van leisure battery & solar setup
Plan with confidence
Getting your battery runtime numbers right early avoids costly rework, undersized components and surprises on the road.
Related battery & solar tools
Pair this with the rest of our battery & solar calculators to plan your full van conversion.
Battery runtime calculator FAQ
- What does the Battery Runtime Calculator do?
- Estimate how long your battery will last running a given load. It is designed for van leisure battery and solar so you can plan with confidence.
- Is the battery runtime calculator free to use?
- Yes. All VanTools calculators, including the Battery Runtime Calculator, are free to use with no sign-up required.
- How accurate are the battery runtime results?
- Results are estimates based on the values you enter and standard van leisure battery and solar assumptions. Always sanity-check against manufacturer data and your real-world conditions.
- Can I share or save my battery runtime calculation?
- Yes. Use the Share button to copy a link that includes your inputs, or use Export to download a PDF or image of your results.