KeepCold Backup Refrigerator and freezer planning

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A 48-hour refrigerator backup plan

Forty-eight hours is a common thing to ask for because a full freezer, door closed, is often described as holding temperature for about that long. Those are different statements. Freezer hold time is about food that is already frozen and a door that stays shut. A 48-hour battery plan is about supplying average electrical load for two days. One does not prove the other.

A refrigerator that is opened, or a freezer that must keep running because the room is hot, is an electrical problem. The closed-door hold time does not apply once you are relying on the compressor. Food rules still come from the official outage guidance, not from watt-hours.

Illustration: 500 kWh per year for 48 hours

Minimum planning capacity is 4,208.8 Wh. None of the four published capacities meets that minimum. The longest planning runtime in the catalog on this illustration is 23.4 hours for the EcoFlow DELTA 3 Max. The gap is a shortfall, not a near miss you should round away.

A lower average draw can fit a longer duration in the same box. That has to be your appliance’s number. Open the calculator with 48 hours selected. Chest freezers often need their own label rather than a refrigerator’s kWh; see chest freezer backup.

48-hour illustration at 500 kWh per year. Shortfalls are expected for this particular energy use.
Model Capacity Continuous Published surge Planning result Source check Link
EcoFlow DELTA 3 Plus 1,024 Wh 1,800 W 3,600 W Shortfall: 3,184.8 Wh below the planning minimum. Planning runtime 11.7 hours.

Spec block matched 1,024 Wh, 1,800 W total, and 3,600 W surge. The same page also describes an X-Boost figure of 2,200 W, which is not the continuous rating used here.

Capacity: The specifications block included “1024 Wh.”

 Manufacturer information (opens in a new tab)
Jackery Explorer 1000 v2 1,070 Wh 1,500 W 3,000 W Shortfall: 3,138.8 Wh below the planning minimum. Planning runtime 12.2 hours.

A specifications row matched 1,070 Wh, 1,500 W rated, and 3,000 W surge. A description sentence on the same page says 1,024 Wh. This site did not replace 1,070 Wh.

Capacity: The page included “30.4Ah/35.2V DC (1070 Wh)” and data-capacity 1070. The product description also says “Delivers 1024Wh Capacity and 1500W Output.”

 Manufacturer information (opens in a new tab)
Jackery Explorer 2000 v2 2,042 Wh 2,200 W 4,400 W Shortfall: 2,166.8 Wh below the planning minimum. Planning runtime 23.3 hours.

Official text matched 2,042 Wh, 2,200 W continuous, and 4,400 W surge. The manufacturer’s refrigerator wording on that page is not a test by this site.

Capacity: The page title included 2042Wh, and the description included 2042Wh of capacity.

 Manufacturer information (opens in a new tab)
EcoFlow DELTA 3 Max 2,048 Wh 2,400 W 4,800 W Shortfall: 2,160.8 Wh below the planning minimum. Planning runtime 23.4 hours.

Official text matched 2,048 Wh, 2,400 W output, and 4,800 W surge. An X-Boost mention of appliances up to 3,400 W is not used as the continuous or surge rating.

Capacity: The meta description included 2048Wh capacity.

 Manufacturer information (opens in a new tab)

Do not stretch a surge rating into two days

Surge watts last seconds, not a weekend. Continuous watts are the published steady output. Neither number is a 48-hour energy total. If startup watts are unknown, compatibility with the compressor stays unconfirmed no matter how large the watt-hour shortfall or surplus is.