Products first, including what they can realistically do. The sizing lesson and the cheap tricks that make stored power last longer are underneath.
1,024Wh · 1,800W AC · 3,600W surge
A typical full-size refrigerator for about 8–14 hours on one charge. An efficient refrigerator may do better; an older, large or hot-room refrigerator can do worse. Adding Wi-Fi, lights or other loads shortens that time.
Good when portability matters and your main goal is one refrigerator through a shorter outage. Add compatible solar or another recharge source for longer outages.
Check Amazon →2,042.8Wh · 3,000W AC · 6,000W surge · 400W solar included
One typical full-size refrigerator for about 16–28 hours before recharging. A refrigerator plus separate freezer could consume the battery much faster, often roughly 8–14 hours as a conservative starting estimate if their combined average draw is about double.
Our preferred starting architecture when you need meaningful stored energy and a real solar refill path from day one.
Check complete system →2,048Wh · 2,400W AC · up to 1,200W solar input
One typical refrigerator for about 16–28 hours before recharge, with similar caveats for refrigerator age, temperature and door openings. Its higher solar-input ceiling is useful if you intend to build a larger recharge setup.
Runtime ranges are planning estimates, not product guarantees. Refrigerators cycle, and actual daily energy use varies enormously.
One refrigerator, shorter outage: the 1 kWh class is the cheaper, lighter place to start.
Refrigerator + freezer or longer outage: start around 2 kWh and make recharging part of the purchase.
Several days: stored capacity alone is not the solution. Solar, generator charging or another refill route becomes central.
1. Decide what is most expensive or hardest to replace. Know which freezer contains the meat, prepared meals, breast milk, specialty foods or other items you would most hate to lose. That tells you which appliance gets backup power first.
2. Freeze what can safely be frozen now. Move suitable refrigerated meat, leftovers and other foods you will not use immediately into the freezer while grid power is reliable. Freeze water containers too, leaving expansion room.
3. Eat or cook the most vulnerable food before the storm. If you have refrigerated food that is already near the end of its safe storage life, use it before the outage instead of creating another item that must be protected afterward. Cooking food does not make it shelf-stable, so cooked leftovers still need safe refrigeration.
4. Build the first-day cooler before you need it. Identify the drinks and foods the household is likely to reach for first. When an outage becomes prolonged, those can move to a working cooler so people are not opening the refrigerator or freezer repeatedly.
5. Photograph the freezer. Take quick photos of shelves or make a paper inventory. You can decide what is inside without opening the door, and the record may also be useful if you later need to document a loss.
FoodSafety.gov says an unopened refrigerator keeps food cold about 4 hours, a full freezer about 48 hours and a half-full freezer about 24 hours. Use actual temperature, not smell or taste, to make food-safety decisions.
A refrigerator does not draw its compressor wattage continuously. It cycles. Temperature, age, size, defrost cycles, ice makers and door openings change consumption. Check the yellow EnergyGuide label. Annual kWh ÷ 365 gives estimated daily kWh. Measuring the appliance for a normal day is better still.
Do not spend battery immediately just because the grid dropped. Closed refrigerator and freezer doors preserve cold. Use appliance thermometers and food-safety limits rather than anxiety.
Protect energy for more than food. Well pumps, communications and medical loads may also depend on electricity.
Test the real system. Plug in your actual refrigerator and freezer, confirm compressor startup, observe battery drain, then test the solar or generator recharge path too.
Redundancy wins. Battery power is quiet and indoor-safe. Solar can replenish it when weather cooperates. A correctly operated generator can carry heavier loads or refill batteries when sunlight is poor.
Use your appliance's average energy consumption, not just its compressor running watts. A practical first estimate is usable battery watt-hours divided by the appliance's average watts over time. Allow for inverter and system losses. For a more accurate household answer, measure your refrigerator for 24 hours.