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Uses Your PC to Analyze and Display the Cost of Using Your Home Appliances and Lights
Efergy E2 Wireless Electricity Monitor
Efergy E2 Wireless Electricity Monitor
Efergy E2 Wireless Electricity Monitor
Item# 90432
Price: Normally $126.95 
Hot Deal $103.95
Free shipping on orders over $175 - See Details


  • Track energy usage on your PC
  • Determine your carbon footprint
  • Memory function
  • Hourly, daily, weekly, monthly and average data
  • Up to 4 tariff settings
  • Simple to install, easy to use

Essential Info

Discover and reduce the size of your carbon footprint with the Efergy Elite Wireless Electricity Monitor. Featuring a powerful PC software package, this advanced electricity monitor utilizes your computer to track and maintain your energy usage. With easy-to-read graphs, you can instantly view power usage, costs and estimated CO2 emissions, as well as historical and average data.

This electricity monitor updates every 6 seconds so you can instantly see the impact of turning a light on or off, boiling the kettle or turning the television off. It has an innovative memory function that allows you to see how much you have used today, yesterday, in the last week and month. In addition, the monitor displays your daily average so you can see when you are using more electricity than normal and see how your average reduces as you change the way you do things.


More Info

Use the Wireless Electricity Monitor to:
  • How much electricity is being used at any given moment
  • The total amount of money being spent on electricity
  • The difference in electricity consumption by turning on and off various appliances
  • How much money can be saved by reducing usage

  • Daily average consumption
  • Savings of 5-20% off typical energy consumption
  • Consumption history
  • Carbon Footprint

  • Specifications

  • Frequency: 433.52MHz
  • Transmission Time: 6s, 12s, or 18s
  • Transmission Range: 40m-70m
  • Sensor Voltage Range: 110V-300V
  • Measuring Current: 50mA - 200A
  • Accuracy: <8%
  • Memory: 64K
  • Power: 3xAAA batteries
  • Certification: ETL Listed
  • Important notes:
    Defective exchanges for identical item within 30 days of purchase. After 30 days, please contact the manufacturer.
    Manufacturer contact information: Efergy USA, Inc., Tel: (305) 470-9716


    9 Ratings
    5 star: 44%  (4)
    4 star: 44%  (4)
    3 star: 11%  (1)
    2 star: 0%  (0)
    1 star: 0%  (0)
    Average Customer Rating
    (9 customer ratings)
    Share your thoughts with other customers
    JAMES -- woodinville, WA   2/24/2014
    This is a nifty little device. The display is large enough to be read from across the room, but compact enough to sit on a windowsill or bookcase. I do wish it could measure power factor in order to display true power rather than apparent power but it's still pretty close in most homes.
    THOMAS -- panama city beach, FL   1/30/2014
    The system is tracking my power company over an entire billing period correctly, though each day does not agree. I was able to put the sensors and transmitter inside the meter panel and not have to put the transmitter outside which was really great.
    Florida Guy -- tampa, Florida   12/28/2013
    I installed the Efergy unit on Dec. 9, 2013 and began collecting data. To date, Dec. 28, the unit indicates I have used 128kW. But the power company's digital smart meter indicates I have actually used 150kW. That's a significant discrepancy. However, I was able to use the downloaded software and enter a per kilowatt hour fudge factor for a second utility and come up with a rather accurate acutual cost. I suspect the discrepancy has to do with the fact the Efergy does not adjust for power factors since it doesn't measure voltage or frequency on your main power lines. Or perhaps the smart meter is inaccurate. As for the software, it is rudimentary and rather squirrely when trying to connect the Efergy to my computer's USB port and download data. Nevertheless, after you do download the data you can identify those high power consuming appliances using the sticky note feature on one of the graphs. Overall, the unit gives you an idea of what is hogging power but the $100 price tag is about twice what I think a unit like the Efergy should cost.
    CONRAD -- johnston, RI   12/4/2013
    install was simple, data is good, and a month later I'm already sure my utility company is screwing me on their billing. Device has also proved highly effective in negative-reinforcement training of other housedwellers to adjust their energy usage. Complete win in my book!
    PATRICK -- rio rancho, NM   2/19/2012
    Don't know for sure but I think it reads a little low. I use it on individual circuits not the main line but it does do what I want it to.
    MICHAEL -- manchester, NH   9/4/2011
    This item is great and easy to use. I installed in less than 10 minutes and was able to view my energy usage in almost real time. You do need to take the cover off of your primary service equipment panel to attach the sensors to the incoming leads from the exterior meter so it can be dangerous if you don't know what you are doing. Also, the updates happen every 10 seconds. That means if you turn on a light, it will take about 10 seconds to show up on the energy monitor. The thing I liked most about this over the other energy meters (Such as Kill-A-Watt) is that it allowed me to see what my 220V devices (dryer and stove) as well as my hardwired AC unit were drawing.
    CURT -- bloomsburg, PA   5/28/2011
    I am pleased with the Efergy E2 monitor. It works as advertised, and was easy to install. Instructions are OK, but could be improved. Overall, I would purchase again.


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