Power planning guides. Shop on Amazon. Compare power stations
BACKUP POWER

Explore

Backup power planning

Portable power runtime calculator

Explore an illustrative energy budget before you choose a battery. Enter capacity, average load and a usable-energy factor to estimate runtime.

1. Your battery and load

Use documented capacity and a representative average load. These example inputs are illustrative, not a product claim.

2. Usable energy

The factor is clamped to 50-100%. It represents an illustrative allowance for conversion losses and energy you cannot use.

Your result

Estimated runtime

Enter your values and calculate.

Explore power station sizes

How to read the estimate

Runtime (hours) = capacity (Wh) × usable energy factor ÷ average load (W). At 1,000 Wh, 100 W and 85%, the illustrative estimate is 8.5 hours.

Actual runtime varies with inverter idle draw, temperature, battery condition, operating mode and a changing load. Motor startup can exceed running wattage. The calculation does not check surge or continuous output compatibility.

Before choosing backup power

  1. List your essential loads and measure representative energy use.
  2. Check continuous and startup requirements against the exact station manual.
  3. Plan charging opportunities and keep the required cables available.

This tool does not establish equipment safety. Do not use it to qualify backup power for medical or life-support equipment; follow the equipment provider's requirements and a qualified backup plan.

Read our research methodology and the watts and watt-hours guide.

Search