Wattcellar

How long will your power station keep things running?

Pick a station, list what stays plugged in, and see the hours and the time on the clock it runs out, with the losses shown.

Last updatedOct 18, 2026

Appliance wattsENERGY STAR data and maker spec sheets, read Oct 18, 2026

Station specsmaker US stores, Oct 18, 2026

Your station and what it powers

Station
Losses
Plugged in, all running at once

Values marked example are illustrative; the starting list below is an example too. Fridge and freezer watts are averages over a day, so the compressor cycling on and off is already counted.

    Clock

    Result

    0h

    • Daylight
    • Twilight
    • Night
    • Battery left
    • Runs out

    The math

      Next: size a station for a whole outage day, or see how fast solar refills this one.

      How the hours are worked out

      Runtime is usable energy divided by the power drawn. Usable energy is the rated capacity, times the share you can use, times the inverter efficiency. Jackery's own formula is the same idea: working time equals capacity times 0.85, divided by the device's watts (Jackery FAQ, read Oct 18, 2026). BLUETTI's version splits it into depth of discharge (90%) and inverter efficiency (85%) for its AC180, and adds the station's own consumption, about 15 W, for small loads (BLUETTI). Picking the AC180 fills in those three; for other stations the share you can use and idle draw are examples.

      The output check is separate. The station's AC output must cover everything running at once, and its surge rating must cover the moment a motor starts. Whirlpool recommends doubling a refrigerator's running watts to allow for start-up, and says motors can need two to three times their running amps (Whirlpool). We assume one motor starts at a time.

      Every appliance figure, with its source, is listed on Methods and sources. Your own appliance's label beats any typical figure.