WhSize My Power

Plan your setup · Check the specifications

Build your power plan.
Find a station that fits.

Add your appliances, choose your runtime, and compare the published specifications of a small regional power-station catalogue.

No account neededPrivate, browser-based calculationsSee results ↓

Ready to see your result and matching products?

1

What do you need to power?

Optional. Leave blank to use the 24-hour appliance schedule below.

Appliance schedule: 24 hours by default

Appliance hours below describe usage within this schedule. The battery estimate scales its average usage to your requested running time.

Presets are editable examples, not measurements of your equipment. This model assumes AC-powered loads.

Hours per schedule × on-time percentage = operating hours per schedule. Use 100% when watts already represents a measured average.

Adjust losses, reserve and startup assumptions

These are planning assumptions, not performance measurements of the suggested products.

From your setup to a shortlist

Add your appliance plan to see matching specifications.

8-model starter catalogue

Sorted by smallest sufficient capacity, not price or commission. This is a limited catalogue, not a best-buy ranking. Stock and delivery are not checked.

Why other catalogue models were excluded
Before purchase: confirm outlet/voltage, startup duration, AC/DC path, low-load cutoff and operating conditions. These are specification comparisons, not independently tested combinations. Not for medical or life-support planning.

Specifications checked 28 September 2026. The matcher moves entries older than 180 days into “Needs rechecking” by default.

The calculation, not a black box

For each appliance, multiply running watts by quantity, connected hours and duty cycle. Conversion losses apply to the appliance energy; standby consumption is added separately.

Load Wh = Σ(watts × quantity × hours × duty)
Scale the schedule energy to the requested running time.
Battery draw = scaled load Wh ÷ efficiency + standby W × running time
Required Wh = battery draw ÷ (1 − reserve)

The optional running-time target defaults to 24 hours. If cleared, it uses the appliance schedule length. Longer or shorter targets repeat the same average usage profile. It is not a prediction of when an individual fridge will stop. Continuous output assumes all active appliances can run together; you can compare one-at-a-time or simultaneous startup. Published surge duration still needs checking.

Reference: OUPES: runtime formula and real-world limitations.

Guide: measuring a fridge’s battery needs →

Before you rely on the result

Are the appliance presets accurate for my equipment?

No. They are labelled examples. Measure your own usage over a representative period. A compressor fridge’s nameplate running watts is not its 24-hour average.

Does enough Wh mean it can run everything?

No. Check inverter watts, startup surge magnitude and duration, voltage, connector type, low-load cutoff and the manufacturer’s operating instructions.

Does this include solar charging or medical backup?

No solar input is credited. Do not use this tool as a medical-device, life-support or home electrical-installation design. Those require manufacturer guidance and appropriate specialist checks.

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