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A full-size refrigerator draws roughly 1 to 2 amps while the compressor is running, on the standard 120V circuit that serves nearly every kitchen outlet — that’s 100–250 watts (Amps = Watts / Volts, so 250W / 120V = 2.1A). For well under a second at startup, the compressor’s motor pulls five to seven times that: a spike of roughly 10 to 14A on a typical full-size fridge that a plug-in watt meter will never catch (a clamp meter with an inrush function will), and that can stall an undersized inverter.
Running amps vary a lot by size and type, and the figures below are the current drawn while the compressor is actually turning — not the number stamped on the fridge’s data plate, which is a safety-margin figure and usually higher than anything the fridge draws in normal use. For a full breakdown of wattage by model, age and features, see how many watts a refrigerator uses, this page’s companion piece.
Running amps by refrigerator size
| Size class | Running watts | Running amps at 120V |
|---|---|---|
| Mini fridge (1.7–4.5 cu ft) | 50–100 W | 0.4–0.8 A |
| Compact / apartment (7–10 cu ft) | 100–150 W | 0.8–1.3 A |
| Full-size top-freezer (18–22 cu ft) | 100–250 W | 0.8–2.1 A |
| French door / side-by-side with icemaker | 150–250 W | 1.3–2.1 A |
The watts-to-amps calculator does this division for any wattage figure printed on a spec sheet, which is the more reliable place to start than the data plate on the back of the unit. Spec sheets don’t always give running watts or amps, though, so treat the ranges above as typical compressor-on draws; a model’s rated annual kWh, covered further down, gives a sourced average for a specific fridge.
Nameplate amps, running amps and startup surge are three different numbers
The data plate on a refrigerator usually lists a higher figure than the fridge ever draws while running — often 6-8A on a full-size unit — because it reflects the fridge’s highest-load operating condition plus a margin set by the manufacturer. It is not the compressor, defrost heater, icemaker and lights all running at once: the defrost heater only runs while the compressor is off. That number tells an electrician what size circuit to size for. It is not what a clamp meter would read on a working kitchen circuit.
The number that actually matters for backup power is the startup surge. A compressor is an induction motor, and induction motors need far more current to start spinning than they need once they’re turning — the same reason an air conditioner or a well pump behaves the same way. Manufacturers call this figure LRA, locked-rotor amps, and it typically runs five to seven times the running current. Take a full-size fridge pulling 2A while running: at 5 to 7 times that, the compressor’s first fraction of a second pulls somewhere around 10 to 14A. A 15A breaker doesn’t trip on that — thermal-magnetic breakers are built to tolerate a brief overcurrent, and a sub-second start spike rarely trips a household breaker even on a circuit carrying other loads. When a fridge circuit does trip, the usual cause is a sustained overload, or a GFCI or AFCI device responding to current leakage or a fault.
Duty cycle: why the average draw is far below the running amps
A refrigerator compressor is not on continuously. In a typical kitchen it cycles on for roughly 30 to 40% of the time — the rest is the compressor off while the insulation holds the temperature, until the thermostat calls for another cooling cycle. Door openings, ambient kitchen temperature, how full the fridge is and its age all push that duty cycle up or down.
Run the math on a full-size fridge at 100–250W running and a 30–40% duty cycle and the extremes come out at roughly 30–100W; most modern full-size fridges average about 40–80W, which is 0.3–0.7A averaged across the day rather than the 0.8–2.1A you’d measure with the compressor actually on. Multiplied across 24 hours, that lands most full-size fridges at about 1 to 2 kWh a day (we plan on 60W, about 1.4 kWh) — efficient ENERGY STAR models at the low end, older or larger units, or ones with an icemaker and a warm kitchen, at the high end. It’s a wide range because duty cycle is the one variable nobody puts on a spec sheet.
What ENERGY STAR-certified fridges actually average
The closest thing to a published duty cycle is a fridge’s rated annual energy use, which folds the compressor’s on-off cycling into one number measured under the Department of Energy’s standard test. Every certified model lists it. The table takes the median rating for each main type among the 4,539 listings marked for sale in the US in the ENERGY STAR certified-refrigerator list (pulled October 15, 2026) and converts it to the average watts and amps the fridge draws over a year at 120V.
| Type | Listings | Median size | Median rated use | Average watts | Average amps at 120V |
|---|---|---|---|---|---|
| Top freezer | 750 | 18.0 cu ft | 363 kWh/yr | 41 W | 0.35 A |
| Bottom freezer, including French door | 1,522 | 20.0 cu ft | 566 kWh/yr | 65 W | 0.54 A |
| Side-by-side | 123 | 24.8 cu ft | 640 kWh/yr | 73 W | 0.61 A |
| Compact | 1,709 | 3.3 cu ft | 246 kWh/yr | 28 W | 0.23 A |
The three full-size medians, 41 to 73W, sit inside the 40–80W average above, in the order ENERGY STAR describes: top-freezer models tend to use the least energy, bottom-freezer and side-by-side designs more. These are lab ratings, though. The test runs at a controlled room temperature, so your kitchen’s temperature, how often the doors open and where the thermostat is set will move a real fridge’s use up or down.
Two GE models show how to read the published figures. The 17.5 cu ft GE GTE18GTNRWW top-freezer is rated at 359 kWh a year, an average of about 41W or 0.34A; ENERGY STAR lists the same model at 443 kWh with GE’s optional icemaker fitted. The 27 cu ft GE GNE27JYMFS French-door is rated at 633 kWh, about 72W or 0.60A. GE’s spec pages list both at 120V, 60Hz, 15A, and GE’s installation instructions call for a 15- or 20-amp fused, grounded supply. That 15A describes the circuit, not what either fridge draws: the averages are well under an amp, and even a 10 to 14A start lasts only a fraction of a second.
Work out your own fridge’s average amps
You can get a close figure for your own fridge without a meter. Start with its rated annual kWh: it is the Estimated Yearly Electricity Use on the yellow EnergyGuide label a new fridge ships with, and you can look it up by model number in the ENERGY STAR list linked above or on the maker’s spec page (GE lists it as Energy Consumption, kWh/year). Divide the annual kWh by 8,760, the hours in a year, for average watts, then divide that by 120 for average amps. Divide the annual kWh by 365 for the daily energy a backup battery has to cover.
For a fridge rated at 600 kWh a year, that works out to 600 ÷ 8,760 = about 68W, 68 ÷ 120 = 0.57A, and 600 ÷ 365 = about 1.64 kWh a day. At the US residential average of 17.99 cents per kWh for the 12 months to July 2026, from EIA’s Electric Power Monthly, that is about $108 a year; the rate on your own bill gives your figure. The yearly cost on an EnergyGuide label uses a set national average rate: GE’s label for the GTE18GTN prices its 359 kWh at 14 cents per kWh, or $50 a year, which comes to about $65 at 17.99 cents.
The result is an average across the day. With the compressor on 30 to 40% of the time, the current while it runs is about 2.5 to 3.3 times that average, and the start spike sits well above both. Door seals matter too: ENERGY STAR advises checking that they are airtight and replacing them if not. To swap the estimate for a measurement, a plug-in energy monitor reads your fridge’s actual kWh over 24 hours, as set out in our refrigerator wattage guide.
Sizing a 15A or 20A circuit around a refrigerator
NEC 210.20 caps a circuit at 80% of its rating for a continuous load, which is the standard an electrician actually designs to: a 15A circuit carries 12A continuous, a 20A circuit carries 16A. Against a full-size fridge’s 0.8–2.1A running draw, that leaves 9.9–11.2A of headroom on a 15A circuit and 13.9–15.2A on a 20A circuit — plenty for a few lights or a low-draw device, comfortably less if you’re also weighing what else is on the appliance wattage chart for the same circuit.
| Circuit | Max continuous load (80%) | Headroom after fridge (0.8–2.1A) |
|---|---|---|
| 15A circuit | 12.0 A | 9.9–11.2 A |
| 20A circuit | 16.0 A | 13.9–15.2 A |
Electrically, a fridge can share a circuit — the headroom above proves it. In practice many electricians still give it its own dedicated 15A or 20A circuit, so that another appliance overloading a shared circuit can’t trip the breaker and leave the fridge off — which means spoiled food if nobody notices for a day. A dedicated circuit does not remove the need for GFCI protection. Where the 2023 NEC has been adopted, section 210.8(A)(6) requires GFCI protection for all kitchen receptacles, not only those serving the countertop, and that includes a dedicated refrigerator outlet. A GFCI that keeps tripping on a fridge is responding to current leakage, so have the fridge checked rather than removing the protection. Which code edition applies varies by state and town; have a licensed electrician confirm the requirements before any wiring work.
Backing up a refrigerator with a portable power station
The same two numbers — running amps and startup surge — are exactly what a power station needs to clear during an outage, and they’re a more demanding pair than most people expect from a device that only draws an amp or two. The inverter’s continuous output rating has to cover the running watts all day, and it needs enough surge headroom in reserve to absorb the compressor’s brief spike without cutting out, which is a different spec from the Wh capacity that gets advertised on the box.
For a mini or compact fridge, a small station such as the BLUETTI Elite 30 V2Check price at BLUETTI (288 Wh) can work, within limits. BLUETTI rates it at 600 W continuous, which is 5A at 120V, so a compressor that draws 0.7A or less while running starts inside that rating even at seven times its running current; a larger compact may not. The 1,500 W figure BLUETTI lists is its Lifting Power, which BLUETTI describes as momentary output for pure resistive devices, so don’t count it as headroom for a compressor start. At the ENERGY STAR compact median of 28W, it runs a compact fridge for roughly 8 to 9 hours (288 Wh x 0.85 for inverter losses is about 245 Wh usable).
A full-size fridge needs more. Our refrigerator wattage guide sets the floor at 1,000 W continuous and a 2,000 W surge, and the BLUETTI AC70 (768 Wh) misses it: BLUETTI’s spec table lists 1,000 W rated output and a 1,500 W surge, and BLUETTI says its 2,000 W Power Lifting mode works only for resistive loads. Both units below clear the floor, and their continuous ratings alone sit above a 10 to 14A start (1,800 W at 120V is 15A). The BLUETTI AC180Check price at BLUETTI (1,152 Wh; 1,800 W continuous and a 2,700 W surge in BLUETTI’s spec table) gives roughly 12 to 24 hours at the 40–80W average above (1,152 Wh x 0.85 is about 980 Wh usable, divided by the average draw). For a longer outage, or a side-by-side with an icemaker, the EcoFlow DELTA 3 MaxCheck price on Amazon (2,048 Wh; 2,400 W continuous and a 4,800 W surge, per EcoFlow) buys roughly 22 to 44 hours on the same math. All three runtime figures are ceilings, since none counts the power the station uses to run itself, which matters at loads this small: BLUETTI puts the AC180’s self-consumption at about 15W, and adding that to the 40–80W average trims its estimate to roughly 10 to 18 hours. Prices move often: the power station price index compares cost per watt-hour rather than any single listed price, and the power stations page lists every model we track.
Whichever capacity you land on, size it against the fridge’s average kWh-per-day figure above rather than the running watts alone — the compressor’s duty cycle is doing most of the work in that calculation, and it’s the same logic covered in more detail on home battery backup and how to size a solar system if you’re planning to recharge the station rather than just run out the battery.
The short version: a full-size refrigerator on a 120V circuit draws 1 to 2 amps running, spikes to roughly 10 to 14A for a fraction of a second at startup, and averages out to well under half of its running amps once the compressor’s duty cycle is factored in. That’s comfortably inside a 15A or 20A circuit’s headroom, and it’s a specific, answerable target for sizing backup power — not just a number to shrug at.