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How Much Power Are Your Appliances Actually Consuming?
Posted By Nicholas Brown.
On this page I will explicate the power consumption patterns of various types of appliances, how to determine how much appliances consume in standby manner, and other little things that you should know. Appliances/devices are added to this page periodically.
Air Conditioner Condensing Units. Image obtained with thanks from chooyutshing on Flickr.
| Table Of Contents |
| Basics (Toaster Oven Case). |
| Air Conditioners. |
| Heaters. |
| Dress Dryers. |
| Lighting. |
| Leaf Blowers. |
| Water Heaters. |
| Electrical Kettles. |
| Electric Cookers. |
| Rice Cookers. |
| Refrigerators. |
| Washing Machines. |
| TVs. |
| Speakers. |
| Laptop Computers. |
| Desktop Computers. |
| Wireless Routers. |
| Fans. |
| Light Bulbs. |
Before y'all go along reading, you should read the ability consumption unit explanations for a breakdown of the various energy units.
Appliance power consumption is determined equally by time, every bit it is determined by wattage (Time Operated In Hours * Watts = Power Consumption). If an appliance was 10,000 watts merely you turned it on for simply 1 second, the power consumption would just be ii.7 Wh (watt-hours), which is about equally much equally a flashlight consumes hourly (next to nothing). You can know that their importance is equal because power consumption = wattage x time used.
In that location are appliances that are a high wattage and are not operated long, such every bit toaster ovens, and nearly other appliances are of the type that are a low wattage and are operated for long periods of fourth dimension. Air conditioners and heaters are the worst of both because they are a high wattage and they operated for a long time.
People oftentimes betoken to high wattage appliances such as toaster ovens, water heaters, and more and call back that they account for most of the electric bill, but they don't.
Basics (Toaster Oven Case)
Read this section of the Understanding Power Consumption page starting time
A toaster oven is unremarkably 1,200 watts, but remember that is the hourly charge per unit of electricity consumption. Then information technology consumes 1,200 Wh afterward an 60 minutes. Due to the fact that it is operated only for a few minutes at a time, the consumption per utilise is non every bit much as you lot would expect. To determine the minutely consumption, divide 1,200 by 60 because at that place are 60 minutes in an hour.
The result is a power consumption charge per unit of twenty watts for every minute that it is on. This means that it consumes 20 Wh for every minute that it is left on. If the oven was on for 5 minutes, then multiply 20 past five and the result is a total power consumption of 100 Wh per employ. If your electricity rate is $0.ten USD/kWh then the price of that is $0.10. 100 Wh = 0.1 kWh. I calculated the cost by multiplying the 0.1 kWh by the 0.10 per kWh electricity charge per unit.
Toaster ovens are operated a few times per solar day, and there are an average of 30 days in each month. If your oven is operated 4 times per day, and so it would price $0.024 USD per solar day which totals $0.72 USD per calendar month.
Appliances normally have their ability consumption in watts printed on the back of them, but it actually varies in many cases due to the fact that people change settings, such as air conditioner or heater thermostat temperature, monitor brightness, and more.
Computers besides have a diversity of settings that can affect power consumption, including a performance fashion (this uses the most electricity), counterbalanced mode (this tries to residue energy-efficiency while withal offer decent performance), and a power saving mode (or 'eco' mode) which is a low operation way that saves the most electricity.
Unfortunately, there are many appliances of which the power consumption cannot be determined by simply checking their labels, including but not limited to the following.
You can mensurate the ability consumption of appliances using a power strip with an integrated meter, similar the P4430.
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Power Consumption Of Air Conditioners
Household air conditioners are one of the few types of appliances that, by themselves, tin can have a pregnant touch on on your electric beak.
Calculate using Kompulsa'southward energy use calculator (web page), or become the Android app for offline use.
The boilerplate 24,000 BTU household air conditioner in the U.S. consumes ane,800 kWh of electricity annually. That translates to 150 kWh per calendar month. [Source]. That costs $198 USD per year at the national average electricity rate of $0.11 per kWh, or $16.50 per calendar month.
Note: There are iv months of winter in the United States, therefore, if you alive in a tropical land, the calculations above won't be relevant to you lot. Also conduct in mind that this is the cost per room, not per household.
Air conditioners practise have a rated power consumption, simply it is their maximum, and that is not usually what they are consuming most of the time. If you are using an under-powered unit such equally a 5,000 BTU one, which is too small to cool your large room, then it is probable to operate on the highest setting and stay on all day. Buying an undersized unit won't relieve electricity, it will just stay on longer as information technology struggles to absurd the room.
The power consumption printed on the label is correct, simply information technology applies only while the unit is on. A properly selected unit of measurement will switch itself off when the room reaches your desired temperature. If, for example, you lot have a 24,000 BTU unit and it is on only half of the fourth dimension. Its (usually) two,400 watt power consumption rating will actually work out to be half that (i,200 watts), assuming it is operating at full capacity (the highest setting, in this instance).
You can figure out how much power your air conditioner is using by determining the pct of the twenty-four hours the unit is running, then multiply that decimal percentage figure (in this case 0.5) past the unit'south power consumption rating, so the result would be 1,200 Wh (1.ii kWh). Multiply the 1.ii kWh by your utility company's electricity rate to make up one's mind how much the unit costs per day, and multiply that by 30 to determine (roughly) how much information technology costs per month.
If you'd like to find the most efficient air conditioners on the marketplace, you tin use our air conditioner finder, which sorts units past efficiency. The nigh efficient units will be displayed at the pinnacle of the search results, along with their estimated monthly ability consumption, monthly energy price, prices, EER, and more than. You can also filter you search results by unit type (divide, window unit, PTAC, etc).
People ofttimes utilize 9,000, 12,000 and 24,000 BTU units that increase or subtract the speed of their compressors as the weather gets hotter or cooler respectively. These are called inverter units.
The non-inverter units operate at the aforementioned speed all the time (excluding fan speeds), and when the room reaches the desired temperature, they close off until it becomes too warm again, and then they turn themselves back on to cool the room dorsum off.
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Many modern air conditioners are of the inverter type. This ways that a device called an inverter controls the speed of the air conditioner's compressor based on the thermostat temperature that you, the user set up it to.
The compressor is what mechanically powers the process that actually cools the air. Inverter air conditioners facilitate real-time temperature control, meaning you can adjust the temperature of the unit of measurement almost immediately. However, it still takes a little time for the temperature of the room to change (a few minutes).
Manufacturers take stated that their inverter air conditioners may swallow up to l% to sixty% less energy than those without inverters. Considering the uncommonly high ability consumption of air conditioners, inverter units may exist worth the extra coin in some cases.
If y'all plough the temperature on the thermostat up, the compressor turns down because you are basically telling it that you don't demand it to cool every bit much, and the result is that it consumes less power considering the compressor has less work to do. The more work information technology has to exercise, the more energy it will crave to practise that work. You lot can find power consumption data for each air conditioner size and more on the air conditioner power consumption page.
NB: The energy usage of air conditioners may be adamant by and large by usage, withal, remote-controlled A/C units do swallow power when they're switched off. This isn't much, though. The combined free energy efficiency ratio takes this into account.
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Further Reading
DOE – Average Annual Power Consumption of Air Conditioners (start at folio vii-21)
Power Consumption Of Heaters
Space heaters/room heaters/central heating systems can take either multiple temperature settings such equally low, medium, or high, or you can set the thermostat to the exact temperature that you want. The more than you turn upwards the thermostat temperature, the more oestrus the heater has to generate to achieve that temperature.
Household space heater ability consumption ratings more often than not range from 500 watts to 1,500 watts. By itself, the nameplate wattage rating is not very useful, as heaters are not e'er running.
Here is a page defended to heater power consumption. It provides ability consumption information by heater size, type, and energy source.
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Power Consumption Of Wearing apparel Dryers
240 volt, vent-free units: Average wearing apparel dryer power consumption ranges from 500 kWh to 900 kWh annually. That costs $55 to $99 annually at the national boilerplate U.S electricity price of $0.11 per kWh. [Source]
Power Consumption Of Lighting
An analysis of recessed lighting, and the power consumption of household lighting, and how to reduce the cost of that tin can exist establish hither.
Power Consumption Of Leafage Blowers
The power consumption of leaf blowers is dependent on the model, every bit some are more efficient than others. The wattage of the model sampled (Worx WG516 400 CFM) is 470 Watts on the low setting, and 731 Watts on the high setting.
The cumulative power consumption of these appliances, on the other manus is heavily dependent on usage. The two questions you'll demand to ask yourself are:
- What setting are you using?
- How long will it be on?
- How many times per month will you lot use it?
For our example, we volition use the following made-up variables. This does not necessarily reflect average usage patterns, this case only serves the purpose of demonstrating a calculation.
- High – This ways it will draw 731 Watts when it'southward on.
- 15 minutes. Carve up 731 by 8 to determine how many Wh (Watt-hours) of energy information technology will consume after xv minutes of usage, since 15 minutes is one-quarter of an 60 minutes. The result is 182.75 Wh. This is also the wattage per use for this example, which is too useful.
- 8 (Every Sabbatum and Lord's day) times per month (once per twenty-four hours). Multiply this by the power consumption per apply: eight * 182.75 = 1,462 Wh (1.462 kWh)/month.
Multiply the 1.462 kWh by your electricity rate: ($0.12/kWh is the U.S. national average) one.462 * 0.12 = $0.1754 . Sometimes the big appliances don't consume as much as you recollect!
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Power Consumption Of Water Heaters
H2o heater power consumption varies significantly with the type of heater used. Tankless water heaters do apply less energy, but they may cost more. Virtually tank water heaters draw 5000-6000 watts when they're on, and only need to operate for xv-30 minutes at a fourth dimension. This ways that their power consumption ranges from 1.5 kWh ($0.18 USD) to 3 kWh ($0.36 USD) per utilise.
If four people live in your firm, the cost of h2o heater operation would start at $0.72 USD to $1.44 per twenty-four hour period (depending on the heater). It would be double that if everyone showers twice daily.
Typical tank water heaters may be equipped with a setting that gives you some command over how quickly you lot heat your water, but unfortunately the heater is not most efficient at the highest setting, so information technology is up to you to make up one's mind whether y'all desire your water heated quickly, or if you are willing to look longer and save money also as electricity.
Keep in mind that h2o heaters don't need to operate every bit long at the college setting, so their ability consumption would unremarkably exist the same no matter what if it wasn't for the issue mentioned above. Remember what I emphasized at the top of this folio most the fact that wattage and fourth dimension used are as important.
Power Consumption Of Electric Kettles
The ability consumption of electric kettles varies by type, for case: Insulated kettles may eat less energy because they lose less of their oestrus to the ambience air. A traditional kettle has to generate boosted heat to compensate for what is lost, and that increases power consumption.
For now, i'll only provide the results of a simple ability consumption exam I performed on a new electric kettle. Bear in mind that this is only 1 model, so information technology doesn't necessarily apply to other kettles.
| Kettle Type | Conventional, glass jar |
| Model | Hamilton Beach K39 |
| Average Current Drawn During Test | ten.9 Amps |
| Cycle Time (How Long Information technology Was On) | 8 Minutes |
| Capacity | ane.7L |
| % Filled | 100% |
| Ambient Temperature | 29 °C |
| Insulation | None |
| Cumulative Power Consumption Per Bicycle | 0.xv kWh |
| Cost Per Employ (Assuming An Elect. Rate of $0.12/kWh) | $0.018 |
| Monthly Energy Toll: | $1.08 (9 kWh) |
The energy price per month was calculated with the assumption that the kettle is used twice per day for 30 days, assuming all of the variables in a higher place.
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Ability Consumption Of Electric Cookers/Hot Pots
The power consumption of electric cookers can vary significantly, equally some are insulated. An electric cooker can be a convenient solution for people who demand to cook while they're busy, but as always: The power consumption matters. For this department, i'll just include test results for an electric cooker I metered, pending the conquering of more than examination information to provide you with an average.
| Cooker Type | Conventional, plastic |
| Insulation | None |
| Make | Elite Cuisine |
| Cycle Time (How Long It Was On) | 5 Minutes |
| Capacity | 32 oz |
| % Filled | 100% (with water) |
| Setting | Medium |
| Cumulative Power Consumption Per Apply | 0.06 kWh |
| Cost Per Use (Assuming An Elect. Rate of $0.12/kWh) | $0.0072 |
| Monthly Energy Cost (assuming 4 uses per day): | $0.864 (vii.2 kWh) |
I would highly recommend purchasing an insulated cooker to reduce power consumption, and continue your nutrient warm longer.
Rice Cooker Power Consumption
The power consumption of rice cookers per use is largely determined by the corporeality of rice existence cooked, every bit well as the capacity of the cooker. Larger rice cookers require more power, and larger amounts of rice require more than power too.
It's also worth noting that some rice cookers are insulated, and therefore consume less power due to reduced heat losses.
Freshly cooked rice in a iii-cup rice cooker.
I oasis't all the same filled my appliance database with rice cooker power consumption data. Still, I metered the power consumption of an off-the-shelf cooker and the results are in the following table.
| Rice Cooker Type | Conventional, steel |
| Insulation | None |
| Brand | Black And Decker: Model RC3303 |
| Cycle Time (How Long It Was On) | 35 Minutes |
| Capacity | one.5 Cups Dry/3 Cups Cooked |
| % Filled | 66%/1 cup (of dry parboiled rice) |
| 'Go on Warm' Style Wattage: | ~25.eight Watts |
| Cumulative Ability Consumption Per Use | 0.10 kWh |
| Cost Per Use (Bold An Elect. Rate of $0.12/kWh) | $0.012 |
This cooker was not operated in 'keep warm' mode during the 35 minute period. The power consumption in 'keep warm' way was measured separately, and was non counted towards the 0.10 kWh cumulative power consumption figure.
Power Consumption Of Refrigerators
The average household refrigerator consumes 400 kWh to a little under 600 kWh annually (this applies to mod units that are less than a decade old, older models can consume far more than that). This translates to a cost of (respectively) $44 USD to $66 annually at the U.S. national average electricity rate, or $three.66 to $5.l per month.
Refrigerator Power Consumption: Deciphering The Label is a comprehensive guide providing ability consumption information on a variety of refrigerators, ordered by size, and distinguished by type.
Refrigerators cool themselves by removing oestrus from the motel (where you put your food) and when they are cool enough, they shut themselves off to save energy.
The wattage of your fridge lonely does not tell you lot the overall power consumption, and it is actually nowhere near what it really consumes. You would need an free energy use monitor to determine the cumulative power consumption by plugging the fridge in it and leave it for at least a calendar week. Preferably a month. Multiply the outcome by 4.
You cannot obtain an accurate average fridge ability consumption figure after metering it for but a twenty-four hours, because sometimes it does non bicycle off for almost of the mean solar day. Some refrigerators operate all twenty-four hour period (which is not necessarily normal), and operate for a much shorter time period the next day.
Fridge Power Consumption Ratings: Modern fridge ability consumption (according to the DOE) ranges from 400 to 600 kWh annually for the average kitchen unit in the twenty cubic-pes capacity range (the 25 cubic-foot models are in the 500 kWh/twelvemonth range).
The larger the refrigerator is, the more ability it will swallow (compared to models from its time).
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Power Consumption Of Washing Machines
The rule that the wattage printed on appliances is not adequate information applies to washing machines also. Washing machines eat widely varying amounts of power from less than xx watts, to more than than 500 depending on what it is doing.
Information technology is filling that requires less than 20 watts, washing requires a few hundred watts on boilerplate considering it has to rotate a large heavy butt full of apparel and lather h2o, rinsing does as well, this applies to spinning also because it literally has to spin a large heavy butt full of apparel and soap h2o. More power is required to move heavier items.
The only way to determine the actual energy usage of your washing machine is to leave it plugged into an energy use meter for at to the lowest degree a calendar week. A day alone will yield an inaccurate result because people sometimes launder their clothes at random times, and load sizes also vary.
The meter will tell you lot the cumulative power consumption in kWh later that calendar week, and then you multiply that by 4. If yous take people come over to practice laundry less frequently than weekly, then leave the motorcar plugged into a meter for a calendar month.
Power Consumption Of TVs
Models Tested (Ability consumption figures are averaged):
Samsung 32″ LED HD Television set (4003 Series): 25 Watts.
JVC LT-43EM75 43″ LED HD TV (2015 model): 29 Watts.
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Ability Consumption Of Speakers And Amplifiers
First: Speakers draw electric electric current from amplifiers, and then amplifiers draw electric electric current from your power outlet in plough to facilitate that.
The electricity usage of your speakers is admittedly nowhere near what is printed on the label. This is because their power consumption is nearly fully adamant by 2 things:
The volume that you set the speaker system to, and the amount of bass in the song that y'all heed to because bass frequencies crave more power to produce than the rest of the higher frequencies (yes, I verified this with an energy use meter, the power consumption spiked every time bass lines were played).
Book affects ability consumption so much that electricity usage can double if y'all plough the volume up considerably. This is but for the sake of knowing, though. Speaker systems are for your enjoyment, they aren't meant to fulfill a practical purpose, so please comfortably mind to them at whichever volume you like.
Don't worry most how much they are using when you turn upward the volume, considering they really apply very little power.
Manufacturers grossly exaggerate the power of their speakers (this cannot exceed the power consumption, by the way, so please wait at the power consumption printed on the back label, and you tin exist sure you won't go anywhere that much power out of your stereo, due to the 'law of conservation of energy', which is a law of physics yous should know well-nigh).
A very tiny corporeality of power is required to produce big audio.
Two Examples Of Exaggeration
- JVC '520 watt' bookshelf stereo arrangement. The average power consumption at half volume was 52 watts (i'm not saying this is the same as the power output, i'm merely showing that 520 exceeds the 52 watts, and the bodily ability output of it cannot exceed the power input). 520 watts is a summit rating which you can't really go from it. Virtually stereos have this unrealistic label on them, and information technology is in bold to get your attending. It is a highly successful gimmick. The power consumption printed on the back is 245 watts, merely, that is the maximum, and at volumes which you lot shouldn't listen to it at.
- Klip Farthermost 40 watt speaker system. The average power consumption is 13 watts, and, due to other physics laws, the power I get out of information technology has to be less than the ability consumption rating.
You can definitely expect your domicile stereo system to utilize less than 100 watts, unless it is an unusually terrible design, or unless you lot play it very loudly.
Power Consumption Of Laptop Computers
The ability consumption of a laptop computer varies significantly with size (especially screen size). The power consumption of standard laptop PCs, which are 15-xviii inches, and run Windows averages ten-xx watts, tiny ones with low-power processors may consume less than 10 watts. As is the case with all computers, a laptop'southward power consumption may increase during heavy CPU usage (for instance: some video games can easily double ability consumption).
Power Consumption Of Laptop Chargers
Laptop chargers power laptops and their batteries simultaneously. Laptop chargers typically describe xxx-70 watts when charging batteries, and this figure tapers off when the battery's state-of-charge nears 100%.
Ability Consumption Of MacBook Pro (2010 13″ model)
When charging (at 0% State-Of-Charge) with the MacBook Pro on: 72 Watts.
When charging with the MacBook Pro off: 60 Watts.
MacBook Pro ability consumption when fully charged (computer on): 13 Watts (boilerplate).
Ability Consumption Of Desktop Computers
Desktop computers vary dramatically in size, specifications, and power consumption. A desktop estimator could use 16 CPU cores, or only 2. The average home desktop PC ability consumption averages 30-160 watts. Power consumption varies significantly with CPU load. This means that CPU intensive apps such as video games and video software tin can easily double power consumption.
Ability Consumption Of Wireless Routers
The power consumption of wireless (Wi-Fi, to be specific) routers is in the 2-five Watt range. two Watts for routers without modems, and 5 Watts for routers with modems. Power consumption varies with model and usage.
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Power Consumption Of Fans
Personal desk fans and standing fans ranging from sixteen to 18 inches in blade diameter swallow 50 to 100 watts. sixteen″ fans typically describe 50-70 watts (50 watts at the lowest setting, and over 60 watts at the highest setting), and the energy usage of 18″ fans may draw up to 100 watts.
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Ability Consumption Of Light Bulbs By Blazon
All figures assume that the bulbs are used half-dozen hours per day, thirty days per month. All figures are monthly, the currency is USD, and an electricity rate of $0.12/kWh is assumed.
Power Consumption of Incandescent Light Bulbs
People often use incandescent light bulbs ranging from forty watts to 100 watts for the average room. Notwithstanding, smaller 25 watt bulbs are used in smaller rooms.
- xl watt incandescent bulb: 7.2 kWh, which would cost $0.86.
- 60 watt incandescent bulb: ten.80kWh, which would cost $1.29.
- 100 watt incandescent bulb: eighteen kWh, which would cost $two.16.
Power Consumption Of Fluorescent Lite Bulbs/Compact Fluorescent Lamps (CFL bulbs)
The wattage of household fluorescent light bulbs (for room lighting) ranges from 13 to 40 watts (some are more than 40, but that would exist overkill).
- 15 watt CFL bulb: 2.7 kWh, which would toll $0.32 (effulgence equivalent to 60 watt incandescent bulb).
- 23 watt CFL bulb: 4.1 kWh, which would cost $0.4960 (brightness equivalent to 100-120 watt incandescent seedling).
- 40 watt CFL bulb: 7.two kWh, which would cost $0.86.
- 65 watt CFL bulb: 11.7 kWh, which would cost $1.twoscore.
Ability Consumption Of LED Lite Bulbs
The wattage of household LED light bulbs is in the range of 4 to 20 watts.
- 4 watt LED bulb: 0.72 kWh, which would toll $0.08 (400 lumens or forty Watt equivalent – this number is rising, as LEDs are improving rapidly).
- 8 watt LED bulb: 1.44 kWh, which would toll $0.17 (800 lumens or eighty Watt equivalent).
- 20 watt LED bulb: iii.6 kWh, which would toll $0.43 (2000 lumens or 200 Watt equivalent).
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Source: https://www.kompulsa.com/how-much-power-are-your-appliances-consuming/
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