Umair Gaines
Many devices continue to draw a small amount of power when they are switched off, which can increase your energy costs. To measure the electricity usage of a device, you can use an electricity usage monitor, which can be purchased at most hardware stores for around $15 to $50. Simply plug the monitor into an electrical outlet, and then plug your device into the monitor. The monitor will display how many watts the device is using, and you can leave it set up to measure kilowatt-hours over a longer period of time. You can also use smart plugs with built-in energy monitoring, or whole-house electricity-monitoring tools that use sensors placed on lines to gather data.
| Characteristics | Values |
|---|---|
| Cost of electricity usage monitors | $15-$70 |
| Electricity usage monitor functions | Measure power (W), energy consumption (kWh), volts, amps, power frequency, power factor, and minimum and maximum power usage (W) |
| Electricity usage monitor use | Plug the monitor into the electrical outlet and then plug the device into the monitor |
| Electricity usage monitor compatibility | 110- to 120-volt systems; not 220V and 230V |
| Energy monitoring devices | Power Meter, Energy Monitor, Sub Meter |
| Energy Vampire Calculator | Put in the number of PCs, chargers, TVs, monitors, printers, etc. plugged in full-time, and it will estimate how much energy is being wasted |
| Energy Vampire Calculator provider | Duke Energy |
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What You'll Learn
Using a power meter to measure plug-in appliance usage
Using a power meter is a great way to measure the electricity usage of plug-in appliances. There are many options available on the market, ranging from cheap to expensive. A plug-in power meter is a good option for home users, and a decent one can be purchased for as little as $15.
The power meter works by plugging into a power outlet, and then any appliance or power board can be plugged into it. It will then immediately start tracking and displaying the power usage, providing real-time wattage or power draw, as well as cumulative energy usage. Some meters will also allow you to input your electricity tariff to calculate the running cost of the appliance. This can be very useful in identifying appliances that are using a lot of electricity and may be worth unplugging or replacing.
Some power meters, like the Kill a Watt EZ, are designed for use on 110- to 120-volt systems, so they may not work on appliances that use 220V or 230V. It's important to check the specifications of the power meter before purchasing to ensure it is compatible with your appliances.
One example of a power meter is the Hopi HP-9800, which can be purchased on eBay for $50 to $70. However, it's important to note that this particular model may have some safety concerns due to exposed metal parts that are live at mains voltage.
Overall, using a power meter is a simple and effective way to measure the electricity usage of plug-in appliances and can help users make informed decisions about their energy usage and costs.
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Calculating annual energy consumption and costs
Calculating the annual energy consumption and costs of your appliances can help you save on energy bills. There are a few ways to go about this.
Firstly, you can use a formula to calculate the daily and annual energy consumption of your appliances. To find the daily energy consumption, multiply the wattage of the appliance by the number of hours it is used per day, and divide that number by 1000. This will give you the daily kilowatt-hour (kWh) consumption. To get the annual consumption, simply multiply the daily kWh consumption by the number of days the appliance is used per year.
To then find the annual cost of running the appliance, multiply the annual energy consumption by the utility rate per kWh.
You can also use an electricity usage monitor to calculate the energy consumption of your appliances. These monitors can be plugged into your appliances and will automatically calculate how many kWh the device uses over a certain period, such as a day, week, month, or year. Some monitors will also allow you to enter the amount your utility charges per kWh, and will provide an estimate of how much it costs to run the device.
If you are looking to purchase a new, more energy-efficient appliance, you can use the ENERGY STAR tool to select and compare specific models. This tool will help you understand the potential savings of upgrading to a more efficient appliance.
It is also worth noting that many appliances continue to draw a small amount of stand-by power when they are switched "off". These "phantom loads" or "vampire energy" can increase an appliance's energy consumption and cost over time. To avoid these extra costs, you can unplug the appliance or use a power strip and switch it off when the appliance is not in use.
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Identifying 'vampire energy' and ''phantom loads'
Vampire energy and phantom loads refer to the electricity used by devices and appliances when they are turned off or in standby mode. Even when your appliances aren't plugged in, they can still pull "phantom plug loads" that contribute to your monthly electric bill. Vampire energy accounts for up to 10% of electric usage in the average American household, costing Americans $19 billion per year as of 2015.
To identify vampire energy and phantom loads, you can use a watt-meter to test individual devices. Unplug the device from the outlet and then plug it into the watt-meter to check if it's drawing any energy. You can also use smart plugs or smart energy strips that automatically shut off power when a device is fully charged or not in use. These devices can also provide real-time energy consumption information for devices in standby mode.
Another way to identify vampire energy is by using an electricity usage monitor, which tells you exactly how many kWh a device or appliance is drawing. There are also whole-house electricity-monitoring tools that work via sensors placed on the lines, usually at the household junction box. These sensors communicate wirelessly with meters and gather data, which is usually uploaded to the web for access.
To manage vampire energy and reduce your electric bill, you can unplug devices that aren't in use, use power strips to control multiple devices at once, or invest in energy-saving home electronics with the ENERGY STAR label. By taking these steps, you can save money, reduce your carbon footprint, and improve the efficiency of your devices.
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Using smart plugs with built-in energy monitoring
Smart plugs with built-in energy monitoring are a convenient way to measure electricity usage by individual devices. These smart plugs can be connected to your devices, and they provide real-time data on how much power your devices are consuming. This helps you identify the devices that are drawing power slowly but steadily, leading to higher electricity costs.
There are various smart plugs available in the market, such as the Kasa HS300, Third Reality switches, and Aeotec Smart Switch 7, which can monitor energy usage. Some of these smart plugs can be integrated with home assistant platforms like Home Assistant (HA) and controlled via a smartphone app or voice commands using Amazon Alexa or Google Assistant.
One example of a smart plug with energy monitoring is the Emporia Smart Plug. It connects to your Wi-Fi network, allowing you to control and monitor your devices from anywhere. The accompanying Emporia app provides insights into your energy usage, helping you identify areas where you can save electricity and reduce standby power consumption.
Another option mentioned by users is the Shelly 1 Plus PM, which can be installed behind an outlet and used to control under-cabinet lighting or other devices. The Shelly Wave is another product by the same brand that is available in Europe and is undergoing certification for the US market.
Smart plugs with energy monitoring can provide valuable data on your electricity usage, helping you make informed decisions to reduce energy costs and identify devices that may be using power even when they appear to be turned off, commonly known as "vampire energy".
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Using an energy monitor to track an entire property
Energy monitors are devices that help you track your electricity usage and identify areas where you can improve energy efficiency. They are especially useful for properties with solar panels or solar-plus-storage systems, as they can help you understand how much energy your solar panels generate and how much electricity you consume. This information can help you adjust your electricity usage to pull less power from the grid at night or during periods of high electricity demand.
Whole-home energy monitors typically work by clipping a pair of sensors around the electrical mains in your circuit panel. These sensors then communicate wirelessly with meters that gather data, which is usually uploaded to the web for you to access. Some energy monitors use machine learning to identify individual appliances and disaggregate their energy draw, while others take a more direct approach by simply tracking and quantifying overall energy consumption.
When choosing an energy monitor, it is important to consider your specific needs and goals. Some monitors have additional features such as the ability to track the cost of your energy consumption in real-time, providing valuable insights into electricity usage patterns. Additionally, some monitors have mobile apps that send notifications about appliances running, offer tips for further savings, and warn of abnormal appliance behaviour.
It is worth noting that the technology for identifying individual appliances is not perfect, and devices with similar electricity usage patterns may be challenging to differentiate. Furthermore, with the increasing integration of smart technologies, whole-home energy monitors may become obsolete or less significant in the future. Nonetheless, for now, energy monitors can provide valuable data and help you make more informed decisions to reduce your energy costs and carbon footprint.
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Frequently asked questions
You can use electricity usage monitors, which can be purchased at most hardware stores for around $15 to $50. Plug the monitor into the electrical outlet, then plug your device into the monitor. It will display the number of watts being used.
Some examples include the Kill a Watt EZ, the Hopi HP-9800 power meter, and the Sense Energy Monitor.
You can use a power meter for plug-in appliances like a fridge or TV. For larger appliances like EV chargers, air conditioners, or hot water systems, you can use an electrical sub-meter.
Some monitors allow you to input the amount your utility charges per kilowatt-hour, and they will provide an estimate of how much it costs to run the device.
