The question of the exact power consumption of household appliances often arises before owners of houses where the electrical grid has limitations, or when planning autonomous power supply. This is especially true for refrigeration equipment, as it works around the clock. Understanding that, How many ampere does the refrigerator consume?It is necessary not only for calculating electricity bills, but also to prevent emergency situations in the wiring.
Many people mistakenly believe that the current consumed is a constant value. However, in reality, the numbers change every second of the compressor. At the time of start-up, the engine consumes several times more energy than in the normal cooling mode. Exactly. trigger-current They often cause traffic jams if the wiring is weak.
In this article, we will analyze the technical nuances of the operation of compressor units, learn how to transfer Watts to Ampere and determine whether your power grid will withstand the connection of a powerful two-chamber unit or Side-by-Side systems.
Basic physics: the translation of Watts into Ampere
To understand what load will fall on your network, you need to be able to operate with basic formulas of electrical engineering. The power (Watts) and the current (Ampers) are connected by voltage. In the standard household network of Russia, the voltage is 220 Volts, although according to the new GOSTs, 230 Volts are considered the norm.
The formula is simple: The current strength (I) is equal to the power (P) divided by the voltage (U). For example, if you have a nameplate on your Indesit or Atlant The power is 220 watts, then when divided by 220 V we get 1 Amp. However, this is a theoretical value for an active load, such as an incandescent lamp.
A refrigerator is an electric motor that has inductive. This means that the actual current may differ from the calculated current due to the power factor (cos ฯ). This ratio is usually between 0.6 and 0.9. Ignoring this parameter can lead to errors in the calculations of the cable cross section.
When calculating, always take a stock current of about 20-30%. This will save the outlets from overheating during long-term operation of the compressor at high speeds.
It is important to distinguish between nominal current and peak values. The nominal current is what the appliance consumes most of the cycle time. Peak current occurs in fractions of a second at start and can reach 10-15 Amps even in small models.
Working and starting current: what is the difference
The most critical moment for the home power grid is the start of the compressor. At this point, the engine rotor is stationary, and the windings consume maximum current to create a magnetic field and spin the shaft. This phenomenon is called trigger-current.
This process lasts a very short time, usually from 0.5 to 2 seconds, but it is at this point that the load on the network increases 3-5 times compared to the operating mode. If you have an automatic switch at 6 Amps, and the starting current of the refrigerator briefly jumps to 10-12 Amps, the machine can work on thermal or electromagnetic protection.
โ ๏ธ Warning: Frequent power outages at the time of compressor start-up can disable the starting relay or the motor itself. If you get knocked out by the machine when you turn on the refrigerator, do not ignore this.
After starting, the rotor begins to rotate, self-induction EMF occurs in the windings, and the current drops to nominal values. In the temperature maintenance mode, modern inverter models consume even less, smoothly adjusting power.
Older single-compressor and mechanically controlled models often have higher intake currents due to the design of the starting winding. New systems with electronic control and inverters start softer, but are sensitive to voltage drops.
Dependence of consumption on the type of refrigerator
Electricity consumption depends on the volume of the chambers, the energy efficiency class and the type of compressor. A small bar refrigerator can consume 0.5 Ampere in working mode, while a huge one can be used. Side-by-Side with an ice generator - all 2-3 Amperes are constant.
Inverter compressors that are currently installed in the model Samsung, LG and BoschIt's different. They are not completely turned off, but only reduce the speed. This avoids giant initiation currents and reduces overall consumption. However, their electronics create high-frequency interference on the network.
The energy efficiency class (A+, A++, A+++) shows how much kWh a device consumes per year. But to calculate the current strength at the moment, a technical passport is more important. Below is a table with approximate values for different types of units.
| Type of refrigerator | Power (W) | Operating current (A) | Start current (A) |
|---|---|---|---|
| Mini-bar/Office | 100 - 150 | 0.5 - 0.7 | 2.0 - 3.0 |
| Single-chamber (old) | 200 - 300 | 0.9 - 1.4 | 4.0 - 6.0 |
| Two-chambered (No Frost) | 300 - 450 | 1.4 - 2.0 | 6.0 - 9.0 |
| Side-by-Side | 500 - 700 | 2.3 - 3.2 | 10.0 - 14.0 |
| Industrial/Wine | 800+ | 3.6+ | 15.0+ |
As can be seen from the table, even powerful household models in working mode rarely exceed 2-3 Amperes. The main problem lies in the short-term jumps at the start.
Load calculation for generator and UPS
If you plan to use a refrigerator from a generator or uninterruptible power supply (UPS), calculating how many amps becomes critical. The generator must have a power reserve to survive the initiation current roll without voltage drawdown and frequency change.
For the UPS, the form of the output signal is important. Many budget models give a modified sinusoid, which has a bad effect on work. induction motors compressors. They can hum, overheat and wear out faster.
Why does the generator stop when the refrigerator starts?
This occurs when the starting current exceeds the maximum short-term capacity of the generator. The generator engine simply "choked" and stalled, not having time to unwind the compressor. The solution is to use a generator with a 3-4 times power reserve or a smooth start device.
When choosing a voltage stabilizer, also look at the maximum input current. If you have an introductory machine at 16 Amps, and the stabilizer at full load itself consumes current, the total load may exceed the limit.
The ideal solution for sensitive equipment is considered a UPS with a double transformation and a pure sine wave output. They provide a smooth start and protect the control electronics from jumps in the network.
Effect of the state of technology on current strength
Over time, current consumption can increase. It's a malfunction signal. If you notice that the refrigerator began to work louder, longer does not turn off or warms the body of the motor, it is worth checking the strength of the current consumption.
The main reasons for the growth of current:
- ๐ Wear of compressor: Mechanical friction of the piston group increases, the motor is harder to spin, the current increases.
- ๐ง Frozen evaporator: If the No Frost system fails and the ice clogs the channels, the heat exchange is disrupted. The compressor works without interruption, consuming maximum current.
- ๐ฌ๏ธ Fan problems: A jammed blower fan creates additional strain on the network and causes overheating.
It is also worth checking the door seals. If they are not tightly attached, warm air constantly enters the chamber. Temperature sensors require cooling and the compressor operates non-stop. It's not so much a wiring hazard as it's going to ruin you on your electricity bills.
โ ๏ธ Note: If the current consumption in the operating mode exceeds the nominal, indicated on the nameplate, by more than 15-20%, immediately contact the service. This can cause the wiring inside the device to burn.
A dirty capacitor (the grille at the back) also impairs heat transfer. The refrigerant does not have time to cool down, the pressure in the system increases, and the compressor requires more amps to pump Freon.
How to Measure Your Consumption Current by Yourself
For accurate measurement of current strength of the conventional multimeter is not enough, as it is included in the break of the circuit, which requires disassembly of the socket or cord. It is safer and easier to use current-measuring Or a household wattmeter socket.
A wattmeter socket is a device that plugs into a regular socket, and the refrigerator is already included in it. The screen displays current Watts, Volts, Ampere and even the cost of electricity. This is the best way to get to the real picture.
โ๏ธ Verification of energy consumption
If you use current-measuring mites, be careful. Only one wire (phase or zero) must be covered, otherwise the device will show zero. For this, you often have to make a special extension cord, separating the wires in isolation.
The data obtained will help you to understand whether the declared characteristics of your Liebherr or BekoThere are no hidden problems with the electrician.
The easiest way to know consumption is to buy a cheap wattmeter socket. It will show the starting jumps, and the average consumption, and the real strength of the current in the Ampere.
Frequent questions about energy consumption
Can I turn on the refrigerator through the extension?
It is possible, but only if the extension cord is designed for a current of at least 16 Amps and has a wire cross section of at least 1.5 mm2 (preferably 2.5 mm2). Cheap Chinese extension cords with thin wire can melt when the current is started, even if the working current of the refrigerator is small.
Why does the refrigerator consume more amps in winter?
In fact, in winter, consumption can be lower if the refrigerator is in a cold kitchen. But if it is standing by the battery or in the direct sun, the compressor will work harder. Also, the increase in current can be associated with thickening of oil in the compressor at very low temperatures, if the equipment is in an unheated room.
How many amperes do you need to connect the refrigerator to the garage?
For garage wiring, lay a minimum of 2-3 Amperes of working current plus a margin. But more important is the quality of the voltage. In garages, there are often drawdowns of the network. If the voltage drops to 180 volts, the current in the engine will rise, which can burn the winding. Use the stabilizer.
Does the fullness of the chambers affect the current strength?
A full refrigerator consumes less electricity in the long run, as the products accumulate cold. However, at the time of initial cooling of full load, the starting cycles will be longer, but the current strength (Ampera) will remain within the nominal value specified by the design of the motor.
Which is more dangerous: high current or voltage surges?
Both factors are dangerous for the compressor. High current (overload) warms the windings and melts the insulation. The voltage surges can break through the trigger relay or electronics. Critical is the deviation of the voltage more than 10% of the norm (220V), that is, below 198V or above 242V.