What Size Portable Power Station Do I Need?

Choose capacity from the appliances you need to run and the time you need them, then verify output and charging separately.

List essential loads

Start with the smallest useful outage plan. Record each appliance’s running watts, expected hours of use, and whether it has a motor or compressor.

Examples of separate planning groups:

Do not rely on a generic appliance wattage list when the label or manual for your own appliance is available.

For steady loads:

energy needed in Wh = watts × hours

For cycling appliances:

energy needed in Wh = running watts × hours × duty cycle

Add the required energy for each appliance. Then account for conversion losses and a battery reserve.

required rated capacity =
required usable energy ÷ efficiency ÷ available battery percentage

Capacity answers how long. Output answers whether the appliance can run at all.

Check:

An appliance with a compressor or motor may need more power at startup than while running. Use the appliance documentation where possible.

A smaller battery that can recharge during the outage may be more useful than a larger battery that cannot.

Review:

Solar charging depends on weather, orientation, temperature, shading, and controller limits. Panel wattage alone does not guarantee a charging time.

Margin can cover:

Avoid choosing a much larger unit without considering weight, storage, charging time, and cost.

Use the runtime calculator for each essential appliance. Add the required usable energy, then compare that total with verified product capacity data.