The question of how much two refrigerators consume often arises among those who are planning a large kitchen, a country house, or want to separate food storage areas. The presence of two units inevitably leads to an increase in electricity bills, but it is impossible to give an exact amount without taking into account the technical characteristics. Modern models can be incredibly economical, while the old Soviet “giants” can “eat up” the budget of an entire family.
It is critical for a property owner to understand the difference between the annual consumption declared by the manufacturer and the real figures that appear on receipts. Actual consumption depends on many factors: room temperature, frequency of door openings and the degree of wear of the compressor. If you are planning to install a second unit of equipment, a preliminary calculation will help you avoid unpleasant surprises when paying bills.
In this article we will look in detail at how to calculate the total power of two devices, what parameters affect the appetite of the equipment and whether you should be afraid of the simultaneous operation of two compressors. You will learn how to convert kilowatts into rubles and which models are considered the most voracious on the modern market.
Main parameters affecting energy consumption
To understand how much electricity two refrigerators consume, you must first study their technical data sheets. The main indicator here is energy efficiency class, which is designated by letters from A to G (or A+++ in older models). Equipment of class “A++” consumes significantly less energy than a model of class “C” or “D” of similar volume, even if they operate under the same conditions.
The second important factor is the volume of the chambers and the number of compressors. Obviously, a large two-chamber refrigerator will consume more than a compact single-chamber model. However, the presence of No Frost systems also makes its own adjustments: such devices require energy not only for cooling, but also for the operation of fans and defrosting heating elements, which increases the overall consumption.
It is also worth considering the age of the equipment. Older models from 10 to 15 years ago often have worn insulation and less efficient compressors. If you already have one such “veteran”, then connecting a second, even modern unit, will give an average result, but the total amount in the receipt will still increase.
- 📉 Energy efficiency class (A+++, A++, A+, etc.) is the main marker of efficiency.
- ❄️ Type of defrosting system (drip or No Frost) affects the operating cycles of the motor.
- 📏 The volume of internal chambers and heat exchange area directly correlate with costs.
- 🔧 The technical condition of the seals and compressor determines the tightness of the circuit.
Flow mathematics: how to calculate the consumption of two devices
Calculating how many kilowatts two refrigerators consume is based on a simple formula, but requires attention to detail. The compressor power is indicated on the back wall of each unit or in the instructions; it usually varies in the range from 0.1 to 0.3 kW. However, the compressor does not work around the clock; it turns on and off, maintaining the set temperature.
To obtain an accurate figure, you need to know the operating time coefficient. On average, a modern, working refrigerator works about 8–10 hours a day (coefficient 0.3–0.4), but in hot weather or when doors are opened frequently, this time can increase to 15–18 hours. If you add up the passport data of two devices and multiply them by real hours of operation, you will get a more objective picture.
Consider an example: the first refrigerator consumes 250 kW per year (about 0.68 kW per day), and the second, more powerful one, consumes 350 kW per year (about 0.96 kW per day). The total daily consumption will be 1.64 kW. Multiplying this value by 30 days, we get 49.2 kW per month. Multiplying by the tariff (for example, 5 rubles), we see the amount of 246 rubles.
| Device type | Average consumption per year (kW) | Consumption per day (kW) | Consumption per month (kW) |
|---|---|---|---|
| Compact (100-150 l) | 150 - 200 | 0,4 - 0,55 | 12 - 16,5 |
| Medium (200-300 l) | 220 - 300 | 0,6 - 0,82 | 18 - 24,6 |
| Large (350+ l) | 350 - 450 | 0,95 - 1,23 | 28,5 - 37 |
| Old Soviet (200 l) | 500 - 700 | 1,37 - 1,9 | 41 - 57 |
The impact of energy efficiency class on the budget
The difference in consumption between energy efficiency classes can be colossal, especially if we are talking about two pieces of equipment. Models with the mark A+++ consume approximately 50% less energy than class A models, and up to 70% less than class B. When installing two such refrigerators, the savings become noticeable on a yearly scale.
However, it is worth considering the cost of the equipment itself. The purchase of two top-class refrigerators can pay off only after several years of active use. If you choose equipment for a summer residence, where it will only work in the summer, overpaying for the highest efficiency class may not be advisable.
⚠️ Attention: The labeling of energy efficiency classes has changed. Old models with class A+++ according to new standards can correspond to class C or D. Always check the actual annual consumption in kW indicated on the product card, and not just the letter designation.
Modern inverter compressors, which are often found in classes A++ and higher, operate smoothly, without sudden starting currents. This not only reduces noise, but also reduces overall energy consumption, since the refrigerator is less likely to reach maximum power to compensate for temperature changes.
Why is class G becoming the norm?
Since 2021, a new scale has been introduced in the European Union and a number of other countries, where class A is still empty, and the best models start with B or C. This is done to encourage manufacturers to create even more economical technologies, since the old “A+++” took the top positions and progress slowed down.
Hidden factors: why consumption may be higher than normal
Even if you bought two economical refrigerators, actual consumption may exceed the calculated one. External factors are often to blame. For example, installing equipment next to a radiator, stove, or in direct sunlight causes compressors to work almost non-stop, trying to compensate for external heating.
Another important aspect is the condition of the sealing rubber bands. If the cuffs in two refrigerators are worn out at the same time, cold will escape and warm air will enter. This leads to the motor constantly turning on. You can check the tightness using a sheet of paper: clamp it with the door and try to pull it out; if it comes out easily, the seal requires replacement.
- 🌡️ Room temperature: in a hot kitchen (+25°C and above), energy consumption increases by 15-20%.
- 🚪 Frequency of door openings: each release of warm air requires energy for cooling.
- 🧊 Number of products: a full refrigerator keeps cold better than an empty one (products work as a cold accumulator).
- 🧹 Condenser contamination: dust on the rear grill worsens heat transfer, increasing the load on the system.
It is also worth paying attention to the habits of users. If you put hot pots in two refrigerators or do not close the doors tightly, no kilowatt calculations will work correctly. Thermal load Food is one of the main enemies of savings.
Does simultaneous operation affect wiring?
Many owners are concerned about whether the electrical wiring can withstand turning on two refrigerators at the same time. The starting current of the compressor can be 3-5 times higher than the operating current. If both units start in the same millisecond, this can cause a short-term voltage drop or knockout of the machine if the network is weak.
However, in modern homes with wiring designed for standard household loads (16 Amps per outlet), two refrigerators can easily operate from one group of outlets. Problems can only arise in old houses with aluminum wiring or when connected through a low-quality extension cord that can overheat.
☑️ Checking the connection safety
⚠️ Attention: It is strictly not recommended to turn on two refrigerators and, for example, a microwave oven or electric kettle in one cheap extension cord (“pilot”). The total load can lead to contact melting and a fire.
To minimize the risk of inrush currents, you can use sockets with a timer or delay relay so that the compressors turn on at intervals of 1-2 minutes. Although modern compressors often have protection against restarting, an artificial delay will be useful for old wiring.
Practical tips for reducing costs
If you already own two refrigerators or are just planning to buy them, following simple rules will help reduce energy consumption. Regular defrosting (for drip systems) and cleaning the rear grill from dust are basic procedures that should become a habit.
Optimal temperature settings also play a role. Do not set the regulator to maximum unless necessary. For basic storage, +4...+5°C in the refrigerator and -18°C in the freezer is sufficient. Reducing the temperature in the freezer to -24°C will increase energy consumption by 10-15%, but will not significantly improve the safety of food.
Also make sure the chambers are full. An empty refrigerator heats up faster when the door is opened. If there is nothing to store, you can fill the free space with plastic bottles of water - they will accumulate cold and stabilize the temperature, reducing the frequency of compressor starts.
The myth of a full load
There is a myth that a jam-packed refrigerator saves energy. This is not entirely true. Air circulation should not be impaired. If the chamber is filled to capacity, cold air will not be able to wash all the products, and the compressor will work longer, trying to cool the central mass of products.
How much electricity does an old refrigerator “eat” compared to a new one?
An old refrigerator from the 90s can consume from 500 to 800 kW per year, while a modern analogue of class A++ consumes only 150-200 kW. The difference can be three or four times. Replacing two old units with new ones will pay for itself in 3-4 years only due to savings on electricity.
Is it harmful for a refrigerator if it stands next to another?
The proximity itself is not harmful if there are clearances for ventilation. However, if two refrigerators are placed close to each other with their sides or back walls, heat transfer deteriorates. This forces the compressors of both devices to work with increased load, which reduces their service life and increases energy consumption.
Is it possible to connect two refrigerators through one voltage stabilizer?
Yes, you can, but you need to correctly calculate the total power. Add up the power of both compressors (at the moment of start-up it is maximum) and add a reserve of 20-30%. If the stabilizer is overloaded, it may go into protection or burn out, leaving the equipment without protection from network surges.
Why can a second refrigerator consume more than the first?
The second refrigerator is often used as a freezer or for storing supplies, so its door is opened less often, but it can operate at lower temperatures. In addition, if this is an old unit purchased “for the garden,” its wear and tear and ineffective insulation will lead to high consumption, regardless of the frequency of use.