The power consumption of a TV is a measurable quantity that shows how much "Winds up" the electricity meter per hour of operation of the appliance, if its power remains at one level. It is measured in Watts (W, W) and depends on many factors. How to determine it, find out further.
Content:
- What parameters does it depend on?
- Energy labeling
- Power calculation methods
- Power Running Models
What parameters does it depend on?
The power consumed by the TV depends on several factors, which we consider below:
Backlight technology
There are several types of methods for making a screen surface for video display:
- CRT (cathode ray tube, picture tube). This is an outdated technology that has been worked out for many decades of production, but energy consumption still remains quite high - within 90-280 watts per hour.
- LCD (liquid crystal display, LCD - liquid-crystal display). These are liquid crystal screens, which are more economical, but their brightness is relatively small. So, if the diagonal of the TV is 20-21 inches, then its power consumption per hour is 50-80 watts. If the diagonal is larger, this indicator can be 200-250 watts.
- LED (light–emittingdiode). Such televisions are quite bright, as each pixel glows in them, and at the same time they consume relatively little electricity - about 100 watts per hour.
LED TVs have 30-40% less power consumption than LCD devices, since diodes are used in their backlight.
- Plasma. Plasma panels are the peak of technology, but they are the most voracious in terms of energy consumption - 300-500 watts per hour or more. So, the power consumption per day can be even 1.5-2.5 kW, and per month - 45-75 kW.
Screen size
The larger the screen, the more power the device consumes. However, it should be understood that a 45-inch plasma screen will still consume more power than a 52-inch LCD.
Image brightness and contrast
The higher the brightness of the image, the greater the power consumption. Therefore, by lowering the brightness on the plasma, you will save electricity. You can do the same on an LCD TV. The above applies to contrast. The smaller it is, the more energy you can save.
It is worth noting that modern TVs are equipped with an energy-saving function that allows automatically set the minimum backlight settings, thereby reducing power consumption energy.
Video Signal Method
The TV can receive video from a cable or SCART, VGA, DVI, HDMI or from USB. The general rule is that the more modern the technology used, the greater the savings, although it will be small.
Sound volume
Another parameter of the power consumption is the sound volume, however, for all TV models, the influence of this value is almost imperceptible. Moreover, in most cases, the TV operates in a mode much lower than the average possible volume.
Despite many factors influencing the power consumption, the main parameter is the technology for displaying the image on the screen, so it should be taken into account in the first place.
Energy labeling
A special 12x6 cm label is attached to the TVs, which shows energy classes and other data. It looks like this:
Conventionally, the label is divided into two parts:
- Top. It consists of stripes, each of which is assigned a letter of the Latin alphabet - from A to G. They denote the class of energy efficiency. The most economical devices are class A, A +, A ++. Moreover, in 2020, the A +++ class is introduced, which will be assigned to new models of devices with the lowest power consumption.
A black arrow indicates the consumption class of a particular model.
- Lower. It consists of four indicators:
- a square with the image of the power button - if it has a vertical bar, it means that the TV is equipped with a transition to standby mode, which saves 10 watts per hour;
- a square on the right side - it indicates the power consumption of the device (in watts);
- a square on the left side - it shows the indicators of energy consumption per year (in kW);
- the diagonal size of the screen, presented in centimeters and inches.
The class of consumption is determined by the standards regarding energy efficiency, which are established in the European Union. It depends on the energy efficiency index (EEI):
| Class | A +++ | A ++ | A + | BUT | AT | WITH | D | E | F | G |
| EEI Index | below 0.1 | from 0.1 to 0.16 | from 0.16 to 0.23 | from 0.23 to 0.3 | from 0.3 to 0.42 | from 0.42 to 0.6 | from 0.6 to 0.8 | from 0.8 to 0.9 | from 0.9 to 1 | From 1 |
The EEI is determined by dividing the specific power consumption of the TV (P) by the reference (Pref). To determine the second parameter, the following formula is used:
Pref = Pbasic + A x 4,3224where:
- Pbasic - a parameter depending on the type of TV:
- having 1 tuner - 20 W;
- having 1 hard drive - 24 W;
- having 2 or more tuners - 24 W;
- having 1 hard drive, 2 or more tuners - 28 W;
- for the monitor - 15 watts.
- A - screen area in decimeters.
For example, you can calculate the consumption class of an LG LCD TV with a diagonal of 32 inches, one hard drive and the following characteristics:
- screen sizes - 7.38x4.49;
- power consumption - 80 watts.
Based on the data presented, the following calculations will be performed:
- Pref = 24 + 7.38x4.49x4.3224, i.e. 167.
- EEI = 80/167, i.e. 0.48.
So, the TV belongs to the consumption class C.
Power calculation methods
To determine the power consumed by the TV, you can use one of the following methods:
Measurement of indications of the apartment electric meter
The first method is the easiest, but not very accurate:
- Turn off all electrical appliances in the house, even those that are not working at the moment, but are in standby mode. It can be a computer, game console, electric stove or microwave. So, only a television receiver should work.
- Record the readings of the home electric meter, then for an hour turn on the tv.
- View the meter readings after an hour.
So, to determine the approximate power consumption per hour, it is enough to subtract earlier readings from the latest readings.
Wattmeter application
The second method is the most accurate, but it requires a special electrical device - a wattmeter, through which the TV receiver is connected to the network. The advantage of the method is that you can instantly see changes in power consumption, varying the modes of energy saving, brightness and so on.
In a short video, the home master, using a wattmeter, directly on the device shows the power consumed by the TV, depending on its settings:
Carrying out measurements with a voltmeter and ammeter
The third method can be applied if you do not have a power meter, but there is a conventional multimeter or clamp meters. The following steps are required:
- Measure current voltmeter readings to determine mains voltage (U). In some cases, it may not be 220 Volts at all.
- Take ammeter readings that indicate amperage (I).
- Multiply the obtained values (UхI) and obtain the desired power (W).
If you use mites, do not forget that only one of the two wires that feed the TV must be passed through the mites.
Power Running Models
To illustrate, we present the power indicators per hour declared by manufacturers for the most popular TV models:
- LG 72LM950V (Direct LED) - 268 W;
- Panasonic TX-P50VT50E (plasma) - 218 W;
- Samsung UE55ES8090 (Edge LED) –114 W;
- Sony KDL-46HX755 (Edge LED) - 89 W;
- Sony KDL-32EX655 (Edge LED) - 43 watts.
So, with choosing a TV It is important to consider such an important parameter as power consumption. It is indicated on the labeling of power consumption and depends on a number of parameters, the key among which is the backlight technology of the device. If the marking is lost, you can use home remedies to find out such an important parameter.
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