What size power station for a chest freezer?
It needs a station with at least 300 W of continuous output and a surge rating of at least 750 W to start it. At the default 85% efficiency it takes about 314 Wh of rated capacity for 8 hours of running, and 941 Wh for 24 hours of running. 49 of the 54 power stations in the Enough Watts data set can power it. The smallest one that keeps it going for 24 hours of running is the BLUETTI Elite 100 mini (1,005 Wh).
Updated
The short answer
300W
Continuous output
750W
Surge to start it
314Wh
Capacity for 8 hours of running
941Wh
Capacity for 24 hours of running
49 of 54
Stations that power it
Watts
Typical figures for this type, from the sources at the foot of this page. Watts vary by model and age. Check the label on your own appliance and enter it for an exact answer.
- Running, typical
- 300 W
- Running, low to high
- 100 W to 500 W
- Starting
- 750 W500 W to 1,000 W, 2.5 times running
- Energy per day
- 0.8 kWh0.55 to 1.26 kWh; the compressor cycles on and off
- Typical use a day
- 24 hthe calculator starts from this, and you can change it
- Average draw while on
- 33.3 W
- Voltage
- 120 V
Explained in: Watts vs watt hours, explained, How to read an appliance label for watts, Starting watts explained and Can a power station run a refrigerator?.
The math
Worked with the typical figure, as the calculator does it.
- Output300 W running, so the station's continuous output must be at least 300 W.
- Surge750 W to start, so its surge rating must be at least 750 W.
- Average draw0.8 kWh a day × 1,000 ÷ 24 h = 33.3 W, because it cycles on and off.
- A typical day33.3 W × 24 h = 800 Wh a day.
- 8 hours of running33.3 W × 8 h = 267 Wh usable, ÷ 0.85 = 314 Wh of rated capacity.
- 24 hours of running33.3 W × 24 h = 800 Wh usable, ÷ 0.85 = 941 Wh of rated capacity.
- On the BLUETTI Elite 100 mini1,005 Wh × 0.85 = 854 Wh usable, ÷ 33.3 W = 25.6 h.
Stations that run it
Every power station in the data with this appliance alone plugged in, at 85% efficiency. Type the running watts from your own label and the table works it out again.
What moves the number
The compressor cycles, so the daily energy sets the runtime: 0.8 kWh a day for a typical recent model under 16.5 cubic feet, 0.55 to 1.26 kWh from the smallest certified model to the largest. Running watts, 100 W to 500 W, matter only for the output check, and the start of about 750 W for the surge check.
A full freezer stays frozen for about 48 hours with the lid shut, so it can rest for long stretches during an outage.
Questions
How many watts does a chest freezer use?
Can a portable power station run a chest freezer?
How long will a power station run a chest freezer?
Why does a chest freezer need a high surge rating?
Sources
Researched from these pages, then checked against them a second time.
- Generator Wattage Chart: Common Appliances & Tools - Champion Power Equipment generator maker guide, checked
- ENERGY STAR Certified Residential Freezers (data.energystar.gov dataset 8t9c-g3tn) government, checked
- ENERGY STAR Flip Your Fridge Calculator data script (Use of Existing kWh/year by configuration, age and size) government, checked
We read published figures and do the math; we do not measure appliances. The methodology states every formula on this page. Capacities are rated watt hours: 1,000 Wh rated gives 850 Wh usable at the default.