The short answer: yes. A standard chest freezer uses about 1,000Wh a day, which means the Jackery HomePower 3000, with its 3,072Wh battery, keeps one running for about three days with no sun at all. With panels and a few clear days, it can keep going far longer.
The HomePower 3600 Plus and the Solar Generator 5000 Plus stretch that further. A freezer is one of the best things to put on a battery, because it is a modest, steady load and the food inside is worth hundreds of dollars. Here is how to work out what you need.
How much power a freezer really uses
The number on the label is the wrong one to plan with. A freezer’s compressor pulls maybe 80 to 200W while it runs, but it runs only a fraction of the time, switching off when the box is cold. What matters is the energy over a day.
Most freezers carry a yellow EnergyGuide label giving kilowatt-hours a year. Divide by 365 and multiply by 1,000 to get watt-hours a day. As typical rules of thumb (check your own label):
- Small chest freezer, 5 cubic feet: about 500 to 700Wh a day.
- Standard chest freezer, 15 cubic feet: about 800 to 1,200Wh a day.
- Upright freezer, 15 to 20 cubic feet: about 1,200 to 1,800Wh a day.
A hot garage in July uses more than a cool basement in January, so use the high end of the range if the freezer lives somewhere warm.
How many days it runs
These figures count the battery alone, with no solar, and ignore conversion losses, so real runtimes will be roughly 10 to 15 percent shorter.
| Freezer | Energy a day | HomePower 3000 (3,072Wh) | HomePower 3600 Plus (3,584Wh) | 5000 Plus (5,040Wh) |
|---|---|---|---|---|
| Small chest, 5 cu ft | about 600Wh | about 5.1 days | about 6.0 days | about 8.4 days |
| Standard chest, 15 cu ft | about 1,000Wh | about 3.1 days | about 3.6 days | about 5.0 days |
| Upright, 15 to 20 cu ft | about 1,500Wh | about 2.0 days | about 2.4 days | about 3.4 days |
Most outages end well inside those windows. The long ones, such as ice storms and hurricanes, are where you want the larger unit or the panels.
Check the current price of the HomePower 3000 at Jackery (panels included)
Food safety: the clock that matters
The US Department of Agriculture’s guidance is that a full freezer holds a safe temperature for about 48 hours if the door stays shut, and a half-full freezer for about 24 hours. Once food has thawed completely or risen above 40 degrees Fahrenheit for more than two hours, it is not safe to keep.
That changes how you should think about the battery. You are not trying to run the freezer for a week without a break. You are trying to make sure it never stops long enough to lose the food. A few practical points:
- Do not open it. Every lid opening lets cold air out. Write what is inside on the lid before the storm so you do not have to look.
- Keep it full. Frozen food is itself a thermal battery. Fill gaps with jugs of water frozen in advance.
- Use a thermometer. A cheap appliance thermometer shows you whether the contents are still at 0 degrees Fahrenheit or below.
- Do not forget the fridge. A freezer is half of the problem. Our fridge runtime guide covers the other half.
Running it in cycles to stretch the battery
Because a full chest freezer stays cold for many hours, you do not have to keep it powered every minute. A common approach in a long outage is to plug the freezer in for a few hours, let it pull the contents back down, unplug it, and repeat every several hours.
This can stretch a battery by a third or more, but it comes with conditions. It works best on a full chest freezer that nobody opens. It is a poor idea for an upright, a half-empty box, or a hot room. If you cannot check the temperature, run it continuously. Losing a freezer of food costs more than the battery life you would have saved.
What solar panels add
A freezer is an ideal match for panels because the load is small and steady. On a clear day, a pair of panels returns 1,500 to 2,000Wh, which is more than a standard chest freezer uses in a day. In practice that means a freezer on a sunny week can run without ever draining the battery.
Cloud changes the sum. A heavy overcast returns only a fraction of the rating, so after a storm you plan on the battery, not the sky. Our guide to how many panels charge a HomePower 3000 shows the charge-time sums for different panel sizes.
Plugging in safely
- Use a short, heavy-duty extension cord rated for the freezer’s amps. A thin cord can overheat.
- Keep the unit dry and ventilated. Do not stack things on it or leave it in a damp corner.
- Never run a gas generator in a garage or basement. Carbon monoxide builds up quickly even with the door cracked. A battery unit produces no exhaust, which is why it suits a freezer in a garage.
- Do not plug the freezer into a power strip shared with other loads. Give it its own outlet.
What else you can run beside the freezer
A standard chest freezer uses about a third of a HomePower 3000’s battery each day, which leaves room for the essentials:
- Wi-Fi and phones, around 250 to 400Wh a day.
- A few LED lights, around 300Wh for an evening.
- A fridge, at 1,000 to 1,500Wh a day. A fridge and freezer together take roughly 2,000 to 2,500Wh a day, which is nearly the whole battery, so this is where the larger unit or the panels earn their place.
For a full list of what each unit can run, see the home backup buying guide, and for the sums behind it the guide to sizing a solar generator.
Battery generator or gas generator?
A gas generator can keep a freezer running for as long as you have fuel, and for a very long outage that matters. But it needs fuel in the tank, a pull cord or a battery to start, and a place outdoors to run it, away from windows. In an ice storm or a flood those are not small asks, and fuel runs short fast.
A battery unit is silent, starts instantly and can sit in the garage beside the freezer. Our solar generator vs gas generator comparison goes through safety, cost and runtime in detail.
Which unit to buy
For a single chest freezer, the HomePower 3000 is the right size. It outlasts the 48-hour food-safety window comfortably, handles the compressor’s starting surge, and includes panels to keep it topped up.
Step up to the 3600 Plus or the 5000 Plus if you want a freezer and a fridge together through a long outage, if you have an upright, or if you live where ice storms or hurricanes leave people dark for a week. Size for the loads you cannot afford to lose, then add the extras.
Jackery's full lineup and current prices
Keep reading: Best solar generators for home backup · How long will a solar generator run a refrigerator? · Can a solar generator run a sump pump? · Can a solar generator power a whole house? · Working from home in a power outage