How Many Watts Does a Refrigerator Use? Running, Average and Starting Watts

A refrigerator never switches off, which makes it the largest steady load in many kitchens. It is also the appliance whose wattage depends most on which number you mean. There are four of them, and they differ by several times:

The ranges are typical, not a specification. Size, configuration, age and compressor all move them, and the labels on the refrigerator in your kitchen describe it better than any chart.

Running watts: the compressor cycle

The compressor switches on when the cabinet warms past its set point, runs until it is cold again, and switches off. While it runs, a modern full-size refrigerator typically draws somewhere around 100 to 300 watts. Between cycles the controls, lights and fans draw very little.

That running figure is consistent with the 1 to 3 amps a running compressor draws at 120 volts, once power factor is counted: 2 A at 120 V is 240 volt-amps but about 204 watts at a power factor of 0.85. How many amps a refrigerator uses covers the current side and the circuit, and what power factor is explains the gap between volt-amps and watts.

Average watts: the number on the yellow label

The EnergyGuide label gives the figure that needs no meter: estimated kWh per year, measured under a federal test procedure. Divide by the 8,760 hours in a year for the average draw, or by 365 for a daily figure.

The average is far below the running watts because the compressor runs for only part of each hour. The ratio between the two is the duty cycle: a refrigerator that averages 68 W and runs at 170 W has its compressor on roughly 40 percent of the time. The watts to kWh calculator takes a duty cycle directly for loads that cycle like this.

Real use often runs above the label. The test is done at a controlled room temperature with the doors closed; a hot kitchen, a garage in summer, frequent door openings, an overfilled or nearly empty cabinet and tired door gaskets all push it up.

What it costs to run

Multiply the kWh per year by the rate on your electricity bill. At 16¢ per kWh — the national figure the FTC now uses on television labels — a 600 kWh a year refrigerator costs about $96 a year, or $8 a month. At 25¢ it is $150 a year.

The refrigerator's own EnergyGuide label prints a cost estimate too, but at the national average rate in effect when that label was written, so on an older model it can understate today's cost. The kWh figure is the part that does not go out of date.

Age matters. ENERGY STAR says an old refrigerator uses about 20 percent more energy on average than an ENERGY STAR model, that refrigerators over 15 years old could be costing about $95 a year more, and that certified models are about 9 percent more efficient than the federal minimum. A second refrigerator in the garage is often an old one, in the hottest room in the house — the combination that costs most.

For scale, a refrigerator usually uses more in a year than a television watched every evening — see how many watts a TV uses — and a household's total runs to thousands of kWh, as how many watts a house uses shows.

Starting watts: what a generator or inverter has to cover

A conventional single-speed compressor pulls a surge several times its running watts at the instant it starts, for a fraction of a second while the motor comes up to speed. The grid supplies it without noticing. A small generator, an inverter or a portable power station may not, and when it fails, it fails at the start — the refrigerator simply never comes on, or the unit trips its overload.

Variable-speed or inverter compressors ramp up gradually and run at lower speed for longer, which avoids most of the surge and makes them much easier to back up. If backup power is part of the plan, it is worth knowing which kind you have.

The surge does not happen in isolation. A generator or battery inverter has to supply it with the other backed-up loads already running, which is why the critical load panel planner tests the largest starting draw against the inverter's surge rating with everything else on.

Keeping a refrigerator running through an outage

Two numbers, two different jobs:

• The inverter or generator must cover the starting surge plus everything else running.
• The battery must cover average watts × hours. At 68 W average, a 24-hour outage is about 1.6 kWh before inverter losses; three days is about 4.9 kWh.

Food safety sets the stakes. Federal guidance is that an unopened refrigerator keeps food safe for about 4 hours without power, and a full freezer for about 48 hours (24 if half full). Beyond that, a refrigerator on a backed-up circuit is the difference between an inconvenience and a loss — one reason it is nearly always on the list, as what a critical load panel is explains.

The label maximum, and the circuit

The rating plate — inside the fresh-food compartment, on the back or behind the kick plate — states the volts and a rated current. Multiplied together, that is a maximum for the appliance, not what it draws while cooling: on a frost-free model the largest contributor is often the defrost heater, which switches on periodically while the compressor is off. It is the right figure for planning a circuit and the wrong one for estimating energy.

The circuit itself is usually not demanding. In a dwelling kitchen the NEC places the refrigerator on one of the 20-amp small-appliance branch circuits or permits an individual branch circuit rated 15 amps or more; the manufacturer's instructions may ask for more. The refrigerator amps post covers the code detail, and the amps to watts calculator converts a label's amps into watts with power factor applied.

Getting your own number

1. EnergyGuide kWh per year ÷ 8,760 — the average, with no tools.
2. A plug-in energy meter for 24 hours — the real average in your kitchen, and the running watts while the compressor is on.
3. The rating plate — the maximum, for the circuit.
4. The compressor type — from the manual or manufacturer, for the starting surge.

When a refrigerator is going onto a home battery, it is the surge and the rest of the backed-up circuits, not the refrigerator's average, that decide whether the system works on the day. On the home battery and backup projects Seamless Home coordinates, those loads are listed and checked during design — get a free estimate to start. Coverage is confirmed per service area rather than promised as blanket availability.