Generator Size for a Refrigerator and Deep Freezer

This is the most common single reason people buy backup power, and it is also the load most often oversized. The running draw is genuinely small. Compressors cycle — a modern fridge is off most of the time — so average consumption is well under the running figure. What makes it awkward is the surge.

The arithmetic, done properly

Only one surge counts. If you added both you would get 5,800 starting watts and conclude you needed a much larger machine, which is the mistake the published method exists to prevent.

Why this load favors a battery

1,750 running watts with a 3,600 watt surge requirement is squarely in battery territory, and for this specific load a battery is better in almost every way that matters:

• It runs indoors. No carbon monoxide risk, no 20-foot placement rule, no cord through a window.
• It is silent, which matters at 3am.
• No fuel. Nothing stored in the garage, nothing to go stale, nothing to refuel in a storm.
• UPS switchover. Several units transfer in under 10 ms, so the fridge never actually loses power — the compressor does not even restart, which removes the surge problem entirely.

That last point is the one people miss. A generator means the fridge stops, warms slightly, and then has to restart its compressor against a cold generator. A battery on UPS duty means the fridge never notices the outage happened.

Worth noting that one manufacturer has built a unit specifically for this: Bluetti's FridgePower publishes a 4 watt standby draw, a 10 ms UPS switchover, a 75 mm slim case designed to sit behind a fridge, and a storm alert that fast-charges itself before weather arrives. For this one job that is a better-engineered answer than a general-purpose box.

The short answer

Picks for this load, battery first

#	Product	Best for	Score	Price
1	Bluetti FridgePower If the problem you are solving is specifically the refrigerator, this is the unit designed for that problem — the 4 W standby and storm auto-charge are genuine engineering answers to it.	Purpose-built refrigerator backup	9.0/10★★★★★	$899.00
2	Jackery Explorer 2000 v2 The most sensible battery backup for most homes: enough capacity to carry a fridge and electronics through a typical outage, indoors, silently.	The default 2 kWh home backup battery	8.9/10★★★★★	$898.99
3	EcoFlow DELTA 3 Classic The best-value battery on the site: UPS-grade switchover, 1,800 W and a 45-minute recharge for roughly half what the 2 kWh units cost.	Best value 1 kWh with UPS	8.6/10★★★★★	$499.00
4	Champion 4,500W RV Ready Inverter The best balance of quiet, clean power and real output for cord-based backup: enough for the essentials, under 3% THD, half the price of the Honda equivalent.	Quiet backup at a sane price	8.5/10★★★★★	$674.10

#ad Prices as of October 5, 2026; they may have changed since. Scores are our editorial judgment from published specifications, not test results — how we pick. How we are funded.

When a generator is still the right answer

If your outages run for days rather than hours, a battery runs out and a generator does not. If you have other loads — a furnace blower, a well pump, a sump pump — you are buying a generator anyway and the fridge comes along for free. And if the budget is tight, a 3,500 running-watt inverter generator costs less than a 2 kWh battery and runs the fridge, the freezer and a good deal more.

The decision hinges on outage length and on whether there are motor loads beyond the fridge. Portable power station vs generator works it through both ways.

What to do before you buy anything

Two things, both free. First, read the nameplate on your actual fridge and freezer — the published chart figures are typical, and your appliances may be considerably lower if they are recent. Second, understand how long you have without any backup at all: FoodSafety.gov's guidance is about 4 hours for a refrigerator and about 48 hours for a full freezer, unopened. If your outages are routinely under four hours, you may not need to buy anything.

If they are longer, see how long food lasts in a power outage for what to do in the meantime, and keep your refrigerator running for the full problem-first version of this page.