As the cost of electrical power increases, the desire to use less energy also increases and the need to measure power consumption becomes a necessity. Reduction of energy use starts with knowing where the use occurs.
CURB is the home energy monitoring system that helps you take control of your house, condo or apartment and all the energy it uses. CURB plugs directly into your breaker panel, giving you real-time data on your energy consumption and production, allowing you to. Home Energy Meters. Manage your energy usage and costs with these residential power energy meters. These products monitor energy in your home. Check the quality of your power by monitoring voltage, line frequency and power factor with this Kill-A-Watt Electricity Monitor. Electricity usage monitors are easy to use and can measure the electricity usage of any device that runs on 120. And you can use a monitor to estimate those too.
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Electrical energy is measured in watts over time. There are many methods to measure electrical power but all have common features. To measure watts in an alternating current circuit, the supplied voltage is compared with the current, and whether the current peaks before the voltage (leading power factor in a more reactive circuit) or the current peaks after the voltage (lagging power factor in a more inductive circuit), the real power is measured.
The old spinning disk and dial indicating watt meters supplied by the serving utility are being replaced by electronic “smart” meters, but they only provide information about the entire service consumption. To monitor individual loads or processes in industry, or more specific consumption in office buildings, watt transducers or monitors can be installed. The purpose is to obtain information regarding more precise information at each installation. This information helps to isolate potential problems such as phase loss or voltage sags and voltage spikes, unbalanced current phase to phase, and can help to avoid utility surcharges levied for poor power factor.
NK Technologies' New APN Series Power Monitoring Sensors NK Technologies' new APN series of power monitors is a big step forward from analog signal reporting watt consumption to a digital format allowing information on the system voltage, current, and power factor along with wattage. The RS485, Modbus RTU format is compatible with many programmable logic controllers and fits seamlessly into industrial communications networks, both hard wired and wireless depending on the specifics of the application. The APN can be configured to accept standard 5 amp current transformer inputs or sensors producing 333mVAC proportional to the AC current of the circuit, or they can use factory matched Rogowski coil inputs. The primary circuit voltage is connected directly to the monitor for 600VAC or lower, or through a potential transformer for monitoring circuits of higher potentials. Professional Email Generator.
The APN is powered from an external supply, improving measurement accuracy of the measurement data. The APN series also provides a pulse contact which opens and closes as watt hours are accumulated. Aquarium Game With Aliens more. This feature allows for a less complex data acquisition device for applications where the need to monitor circuit voltages or the other data points is minimal Monitoring Air Conditioning System Power Usage NK Technologies' has installed APN monitors to measure power use by the air conditioning system as part of its efforts to reduce power consumption at its factory.
A data acquisition system designed and built by its engineering staff was also installed. Five APN sensors are connected to the 120/208 volt power feeding the AC units mounted on the roof of the building.
The pulse contact reports watt hour usage to counters made by Dataq Instruments (DI-160). This information is read at regular intervals, allowing auditors to know power consumption of each AC unit. In addition, the APN monitors are also connected via Modbus RTU to an internal wireless network using NK Technologies' WRT transceivers. This allows the details regarding power use to be seen and power usage analyzed at any time.
Measuring your home’s energy consumption is the first step toward finding ways to decrease it. While almost every residence has an electric meter, it usually only shows total household energy (kWh) consumed, although some include instantaneous power being used (kW). And the meter is usually placed where it is convenient for the utility—not for you—to read. But conservation-minded homeowners and renters can choose from several products that measure and record electricity consumption to reveal the energy hogs. The information is shown on a convenient countertop display or remotely on a smartphone or a computer screen. If you want to use energy data to help reduce usage or convince other household members to adopt energy-saving behaviors, an energy monitoring system is for you.
Or maybe you want to see how large a backup generator you need for utility outages, or how large a solar-electric system you need for your home. Maybe you just want to identify the biggest electricity loads in your household. If you already have a PV or wind system, you might need to monitor the on-site generation. The Basics A typical home energy monitoring system includes sensors, a data gateway, and a display to receive and view the information. Standard information includes energy consumption in kilowatt-hours (kWh) and power draw in kilowatts (kW). Often, monitors include the cost of the electricity consumed, and some allow programming with time-of-use rates. Monitors require sensors at each point of measurement.
Current transducers (CTs) and pulse sensors are most common. CTs are available in split-core or solid-core varieties. Split-core CTs make it easier to install in existing electrical installations, since you can open up the “donut,” and then close it around the wire.
Note that CTs are typically not interchangeable between different systems. A magnetic field is created as the current in the wire flows. When that magnetic field moves through the coil of the CT, it generates voltage proportional to the current flow. This voltage is measured by the electronics and converted into an amperage reading.
At the same time, the voltage in the circuit is measured directly, and simple multiplication results in kW. Include the elapsed time, and kWh are computed. The other sensor type—pulse—counts the electronic pulses made by the utility meter as it counts units. Many utility meters for electricity, gas, and water are pulse meters. Simple pulse sensors are not sophisticated enough to determine whether the energy flow is incoming from consumption or outgoing from a home source, like a PV system.
Some meters gather more data from the sensors than others, updating readings every second compared to every 30 seconds. The way in which the data is used in calculating kWh or instantaneous kW will also influence the meter’s accuracy. The sensors are hard-wired or communicate wirelessly through data loggers or transmitters that, in turn, send data to a local display.
Some systems do not need or do not use a separate display. These transmitters are connected to the router so they can communicate within a local area network (LAN) and/or through third-party servers over the Internet. Several transmitters and gateways require a power supply and consume from 3 to 10 W. Most monitors allow information to be downloaded into a spreadsheet for further analysis. I did buy the EnviR. The transmitter comes with batteries but the display uses no batteries at all and runs only on the wall wart supplied. The HP article erroneously states that the display runs on batteries.
The transmitter is made to install in a breaker box if outside and I would think it would diminish the signal strength. My breaker box is inside so I installed the transmitter on the wall bringing the CT leads through a knockout hole. The transmitter sends out a data pulse every 10 seconds so if you have an appliance that cycles on/off the synchrony of the data pulse and on time of the appliance could be out of wack so that a long observation would be required to notice the on effect of the appliance.
John Nelson Nucla, CO. After reading the article, I was interested in 'The Owl' monitoring system. Upon going to there website ( in the UK ) I find that the pictured Owl ( CM119) is not listed and replaced by the Owl micro +. However, they list having in the package only one CT which to me would allow only monitoring of one phase of a 240 volt ( read half your circuits ), or monitor only one branch circuit.
You need two CT's to monitor both hot 240v lines and get the full picture of the power going through your breaker box. HP article is misleading in saying the '.incoming wires to the main electrical panel' John Nelson, Nucla, CO.