Free planning tool: no sign-up. Results are estimates, not engineering or installation advice.
UsedItFirst
Free energy calculator

Portable power station calculator

Turn device watts and runtime into a practical minimum battery and inverter target.

Built by Calculator version 1.0Updated October 26, 2026

Your inputs

Use the numbers for the exact devices, vehicle or battery system you plan.

Planning model only. Verify manufacturer limits, applicable code and installation requirements before purchase or electrical work.

Your planning estimate

Recommended minimum capacity—
Input—
Output—
Planning factor—
Next check—

Enter your numbers and update the estimate.

Use the result

What to do next

The number narrows the market; it does not select a product by itself. Compare continuous and surge limits, charging compatibility, certification for intended use, warranty and total installed cost.

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Quick answers

Portable power station calculator FAQ

How is power-station size calculated?

Load watts are multiplied by hours, divided by an 85% planning efficiency and increased by the selected reserve.

Does watt-hour capacity determine what I can run?

No. Watt-hours estimate runtime. Continuous and surge output determine whether the inverter can run and start the load.

Is the result a guarantee?

No. Actual runtime varies with temperature, battery age, inverter losses, load behavior and manufacturer limits.