Portable Power Station Runtime Calculator
Add what you want to run and for how long. We'll tell you the battery size (Wh) and output (W) to look for, plus how long a given power station would last.
Around the house
Camping, RV & travel
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Watt figures are typical averages. Fridges and freezers cycle on and off, so we use their average draw. Check the label on your device or use a plug-in watt meter for exact numbers.
How the calculator works
Energy needed (Wh) = watts × hours per day × quantity × days. We then divide by 0.85 because roughly 15% of a power station's energy is lost converting battery power to household AC.
Output needed (W) = the running watts of everything that might be on at the same time. Surge matters for anything with a motor or compressor (fridges, pumps, AC units), which can briefly pull 2–3× their running watts when they start.
Size classes, prices and weights shown are typical ranges, not quotes. For exact picks, see our home backup and camping guides.