An upright freezer typically draws about 150 watts while running (roughly 100-250 W) and uses about 1.1 kWh a day. Plan for a brief starting surge of up to about 2,200 watts.
- Running watts
- 150 WTypical; 100–250 W across models
- Starting watts
- 2,200 WCompressor start surge lasting under a second, per generator makers'…
- Per day
- 1.1 kWh24 h of use, cycling
- Current
- 1.2 AAt 120 V while running
Figures checked against DOE, ENERGY STAR and manufacturer data on . Your model's label is the final word.
Watts by model and setting
Most upright freezer models draw between 100 and 250 W while running; a typical one draws about 150 W. ENERGY STAR says certified upright freezers use about 395 kWh a year (~1.08 kWh/day); 150 W x 24 h x 0.3 is about 1.08 kWh/day. Defrost heaters on frost-free models add periodic higher draw.
- Frost-free uprights run defrost heaters and use more than manual-defrost models
- Size and age; ENERGY STAR models are at least 10% better than the federal minimum
- Front door lets cold air spill out each time it opens
- Hot garages or poor ventilation raise run time
Running an upright freezer on a generator or power station
- Generator: at least 150 running watts and 2,350 starting watts (running plus the 2,200 W start surge, the cautious way to size it). Check both numbers on the spec sheet. A generator rated 3,000 W or more covers it with room to spare.
- Power station: continuous output of at least 150 W and a surge rating that covers about 2,200 W. Pure sine wave output is the safe choice for motors and electronics.
| Power station capacity | Estimated runtime |
|---|---|
| 500 Wh | 9.4 h |
| 1,000 Wh | 18.9 h |
| 2,000 Wh | 37.8 h |
| 3,000 Wh | 56.7 h |
Based on 45 W average draw (running watts × duty cycle) and 85% usable capacity.
- Start it before other big loads so the generator only handles one surge at a time
- Pure sine wave output is recommended for compressor motors and electronic controls
- Keep the door closed; a full freezer stays frozen about 48 hours without power
- Run a gas generator outdoors only, at least 20 feet from doors, windows and vents; carbon monoxide from generators kills. Connect appliances with heavy-duty extension cords or a professionally installed transfer switch, never by backfeeding.
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Questions people ask
How many watts does a frost-free upright freezer use?
About 100-250 W while the compressor runs, with short higher spikes during defrost. Over a day that averages around 1 kWh for an ENERGY STAR model.
Can I run an upright freezer on a power station?
Yes, if the power station's surge rating covers the compressor start; a 1-2 kWh unit can keep it going for about a day.