Ordinary Prepper had no freezer pages until now, which was a genuine gap: the freezer is the appliance an outage threatens first and the one bulk food storage is built around. These are the questions people actually ask in forums and freezer FAQs — what size, chest or upright, and what really happens hour by hour when the power dies — each answered with the numbers it rests on. This shelf hangs off our Food hub.
Buying questions
Chest freezer or upright — and what size for a family of four, or half a cow?
Plan on 25–35 pounds of food per cubic foot: a family of four usually lands at 10–14 cubic feet, and half a cow (roughly 200–250 pounds of wrapped meat) needs 8–10. A chest wins the outage test — about 590 watt-hours a day and a 48-hour holdover when full, against roughly 1,080 watt-hours a day for an upright — while the upright wins the daily argument about finding anything in it.
How much electricity does a chest freezer use per day — could a small station keep it frozen?
ENERGY STAR’s certified chest freezers average about 215 kilowatt-hours a year — roughly 590 watt-hours a day. That is the cheapest big load in the house to back up: a 1,000 watt-hour station keeps one frozen for about a day and a half, and a 2,000 watt-hour station for close to three days.
Covered in: How long will a power station run your CPAP, fridge, or freezer?
What a freezer uses per day (ENERGY STAR certified averages — a chest averages about 215 kWh a year): chest freezer about 590 Wh/day · upright freezer about 1,080 Wh/day.
In station terms: A 1,000 Wh station keeps a chest freezer frozen for about a day and a half; a 2,000 Wh station, close to three days.
Outage questions
Is it really 48 hours for a full freezer and 24 for half-full? Does chest vs upright change it?
Those are the USDA’s numbers and they hold up: a full freezer holds a safe temperature about 48 hours with the door shut, a half-full one about 24. A chest beats an upright at the same fill because cold air stays in the box when the lid lifts — but fill level matters more than shape; a full upright outlasts a half-empty chest.
Can I refreeze meat that thawed in an outage?
The food-safety rule is about temperature and ice, not the clock: if the meat still contains ice crystals, or a thermometer shows it stayed at 40°F or below, it can be refrozen safely — expect some quality loss, not a safety problem. Above 40°F for more than about two hours, the answer is the bin, and no bargain changes it.
Should I fill empty freezer space with water jugs before a storm? Does it actually help?
Yes — it’s the cheapest outage upgrade in the house. Frozen jugs turn a half-full freezer into a full one thermally, which is the difference between the 24-hour and 48-hour timelines above. Leave headspace in each jug (water expands about 9% as it freezes) and freeze them before the storm arrives, not during it.
The USDA timelines: A full freezer holds a safe temperature about 48 hours with the door shut; a half-full one, about 24.
Refreezing: Ice crystals present, or 40°F or below: refreeze safely. Above 40°F for more than about two hours: the bin.
The water-jug trick: Frozen jugs turn a half-full freezer into a full one thermally — leave headspace in each jug; water expands about 9% as it freezes.
How we answer
Ordinary Prepper is a research desk, not a test lab: we do not claim hands-on testing. The timelines above are USDA food-safety guidance; the electricity figures are ENERGY STAR certified-product averages; where a number is a planning rule of thumb (like pounds per cubic foot), the answer presents it as one.