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North America Bundle (120V split-phase)

(9 customer reviews)


Basic bundle for typical North American 120V/240V split-phase service.  Select appropriate mains CTs. Add more CTs to handle solar and 12 or more individual circuits. See description below for details.



Easily installed with clamp-on or snap-around current sensors for the load-center mains, a wall plug AC reference transformer, and a wall plug USB power supply.  Connects to home WiFi with an integrated local web-server.  Browser based configuration using phone, tablet or computer.  Display and export data using integrated visualization tools. Uploads data to popular cloud services including PVoutput, Emoncms and influxDB.

  • Choice of easy clamp on mains CTs or conventional split core CTs
  • Add an ECS10-50 CT to the bundle to monitor solar inverter up to 12kW.
  • Add up to 12 additional CTs to monitor individual circuits.
  • Open hardware using open source firmware.
  • Can be used with commercial three-phase power systems.
  • Stores high resolution usage data for more than 10 years.
  • All connections plug and jack.
  • ETL certified to UL standards.
  • Less than half the cost of highly advertised alternatives.

Bundle includes:

  • IoTaWatt Base
  • USB Power Supply
  • AC Reference Transformer


  • additional 2 ECS25-200 CTs for mains
  • additional 2 ECS24-200 CTs for mains
  • additional ECS16-100 CTs
  • additional ECS10-50 CTs
  • additional ECOL09 CTs

Additional information

Weight 1 oz
Dimensions 6 × 6 × 1 in

9 reviews for North America Bundle (120V split-phase)

  1. ogiewon

    I have long been curious about my home energy usage. As an electrical engineer, I even started to design my own custom circuit board and had bought some parts to perform some proof of concept testing. About the same time, I discovered the IoTaWatt. It was going through multiple design iterations and was looking very promising. I decided to put my own efforts on hold and to watch the progress of IoTaWatt. About a year ago, I decided to jump in and bought my first production IoTaWatt. I was able to install it and have it up and running relatively quickly. My early questions were quickly answered by @overeasy and other passionate users in the IoTaWatt Community Forum. I have since purchased a second IoTaWatt and will be installing it this summer on my second electrical panel which is outside of my house. This one will take some more planning to make sure everything is weatherproof.

    One of the great features of IoTaWatt is the built in support for sending data to a local InfluxDB process data historian. InfluxDB + Grafana (both free open source products) allow for very easy historical data tracking and graphing without having to write any custom code whatsover.

    I have also integrated my IoTaWatt with my Hubitat Elevation home automation hub. This allows my Hubitat system to have real-time access to the power usage of any circuit. I use this to know when my washer or dryer completes a laundry cycle and to send a notification to our phones. I could also use this to know if a device has been running for too long, or consuming too much power, and to send an alert so I could start troubleshooting.

    I am very impressed by what IoTaWatt has accomplished in a short amount of time, and that the product is so robust and flexible for users around the globe! Seeing the continuous progress being made on both the hardware and software tells me that I made the right decision in investing in IoTaWatt!

  2. Ben (verified owner)

    This is a best home energy monitor on the market.
    Initially, I was going to buy a “Sense” brand that costs $100 more, does not have individual CTs for every line and tries to identify loads by learning power patterns, but after reading Amazon reviews made my choice in favor of IoTaWatt.

    IoTaWatt was easy to install and configure. It is very powerful and flexible. By using its data I’ve got a plenty of useful information about my house devices. In particular that my refrigerator has different modes while its consuming 4W, 140 and 600 W, that my AC is really energy-efficient, that when everything in house seems is turned off, many small, always plugged-in devices, still suck about 80-100 W all the time.

    So, in sense of price, and hardware quality I don’t wish more but user interface and data presentation, IMO, needs some improvement.
    In particular, a monitor generic web application is not a resolution-aware one, the tables and buttons on hi-res tablets and phones are tiny, hard to see and operate.
    The graphs from OpenEnergyMonitors are also far from perfection. They are not live, have a lot of useless interface elements that obscure more important info.

    Since IoTaWatt has an open API (I guess), so probably a specialized application for Android will appear in Google Play Store sooner or later.
    It would be nice to have an app with basic simple interface and text message warning system if iron/stove or other unintended load is
    still on while phone owner is out of house (GPS).

    Anyway, IoTaWatt worth of every penny spent.
    Thank you, Bob, good job.

  3. aggiee

    I looked at the other home energy monitors and chose IoTaWatt (North American bundle) because:
    1) The low cost, under $300 to monitor mains + 12 branch circuits.
    2) The base unit has a local web server built-in, to view color graphs of my energy usage. All energy usage data is stored locally on the MicroSD card inside my IoTaWatt base unit.
    3) I’m not required to share my energy usage data with a cloud service. It’s private.
    4) The IoTaWatt firmware is open source software, so I can inspect and customize the source code.
    5) The IoTaWatt community forum is a valuable resource to search for answers or ask new questions.

    I would prefer a wired Ethernet connection on the IoTaWatt base unit because it’s my personal belief that devices in a fixed location within the home should have a wired connection to the router/switch. And it’s my opinion that Wi-Fi should only be used with devices that roam. However, a case could be made that Wi-Fi is safer to use around a high-voltage load center. So, I don’t mind that IoTaWatt uses a Wi-Fi connection to my home network.

    Lastly, it would be nice to connect an add-on box to the IoTaWatt base unit for attaching additional inputs like temperature, humidity and pressure. This weather data could be displayed within a chart of my daily energy usage.

  4. George

    I have had IoTaWatt installed since the beginning of the year (8 months). It has worked flawlessly. In comparing the whole house result to the energy company bill the total kW-hour figures are less than 1% different which is amazing.

    I really like having the certainty of individual breaker direct measurements telling me exactly where the energy is going. I investigated most of the available options on the market and read many, many reviews. The whole house monitors using just 2 current sensors and AI to figure out from the current signature energy numbers for individual loads sounds great. But, from all the reviews it takes very long time to identify a small number of major loads and mistakes get made with no way to fix them. Reading Amazon reviews showed me that many were not happy with the details/quality of the energy breakdown.

    Another thing I really like about IoTaWatt is that it does not depend on a cloud service. The potential problem with cloud service is if that company gets into financial trouble you either end up with monthly fees or worse yet the company goes bankrupt and your system becomes useless and needs replacing.

    Lastly, I like that IoTaWatt isn’t phone app centric. It runs a web server that provides all the data and the graphs I want that can easily be accessed by a computer with a real monitor that makes it easy to see. Believe it or not a couple of the home energy monitors are phone app only. You can view IoTaWatt results on your phone just by using a browser. Admittedly if you want to view your energy use on your phone while away from home you have to set up a few more free pieces of software. But, personally I never need/even want to see my energy usage away from home so I did not set this up.

    Basically, of the type of systems that directly measure multiple channels IoTaWatt is the least expensive and the most capable. It is also no harder to install than any other. Highly recommended.

  5. Scott (verified owner)

    I install $20k energy monitoring systems for solar on a daily basis. For year been looking for an inexpensive solution for the home. I finally found the perfect fit with iotawatt and couldn’t be happy. Easy to setup and reliability. Pushing data to influxdb works perfectly and dashboards on Grafana are beautiful.

  6. Dan Kok (verified owner)

    I purchased Iotawatt this week and I couldn’t be more pleased with the product. The value provided by the openness and expand-ability of the system is second to none in the market with the ability to export to influxdb and monitor up to 14 circuits in the base product. I also don’t feel trapped in some manufacturer’s cloud-based offering where they’re monetizing me by selling my data to someone else.

    I have already made some changes in how I use energy. After finding out that my third most consumptive load is my basement dehumidifier I changed the setting to a higher but still comfortable setting for the basement that causes it to run less often. My wife has a heated floor in her bathroom (surprisingly only the fifth most consumptive load) and it was configured to heat the floor during times when she wasn’t in there. I changed that too and with these changes I feel better about unnecessary electricity use.

    Thanks so much for such a great solution for monitoring my energy consumption.

    P.S. I found Iotawatt because it was mentioned in a review for Sense on, ha ha.

  7. RJ Horner

    Great product.. cheapest considering all it’s features. Easy for someone with minor electrical experience to install. Very closely matches what my electric company says I use. Works great monitoring both of my grid tie inverters and home power usage at the same time. Also Very helpful for a user trying to lower their electric bill. Overeasy responds to questions in a timely manner.. The entire process from figuring out what to originaly purchase to sitting here enjoying all this technology has been enjoyable..

  8. Drew Stephens (verified owner)

    I looked at all of the energy monitors on the market and read a lot before settling on the IoTaWatt. TED is expensive, has clunky displays, and is limited in how you can explore the resulting data. Sense sure looks great, but every review says that it fails to comprehend at least a few devices in the home and it relies on cloud software that could disappear at any moment along with the parent company. There are many other smaller players that are either similarly cloud-burdened or much to DIY.

    I was hesitant at first because open source, closer to DIY solutions are often like taking on a new hobby of being a maintainer of the system. Thankfully, IoTaWatt doesn’t suffer from this at all; it really is plug and play. The installation is a fairly high bar for many, since it (like any energy monitor) requires opening your panel, but that’s where the difficulty ends. With the current transformers installed and plugged into the IoTaWatt box you’re mostly done. All that is left is a bit of configuration through the web interface and you have powerful energy monitoring.

    Overall IoTaWatt is superior to cloud based systems because it’s a box that can’t go bankrupt after you buy it and better than very DIY systems that require you to become the maintenance staff for poorly written software. Additionally, IoTaWatt provides very easy export to things like EmonCMS, InfluxDB, and PVoutput if you want to combine its data with other sources or have more powerful analysis tools (dashboards, etc.).

  9. R. Copus (verified owner)

    My experience with Iotawatt has been great. Ordering was straight-forward and
    clear. Payment (by cc) was secure and seamless. The shipping and delivery was
    nothing short of astounding: The complete kit was delivered in less than 2 days,
    and that is to our home in the midwest. Hats off to the order fulfillmet person or
    persons. This was unexpected.
    I was not too familiar with Iotawatt and only found it by happenstance while
    reseaching power monitoring systems on Amazon. I had seen some Sense units in
    operation when I went to solar open house expositions in my area. These units
    diplay their readings well but although they had been in operation for some time,
    their results were only partial; that is the ‘learning’ was slow and incomplete.
    Many power usages were not detailed
    After a long decision process I came to Iotawatt.
    Installation consited of mounting an 8×8″ box to the wall between my main and
    sub panels putting a 1-1/4′ pvc pipe to each panel and enlarging an existing
    receptacle from a duplex to a fourplex receptacle for the reference
    transformer and the usb power supply. I hold a journeypersons’ electrician license.
    If I may put forth some suggestions:
    Print out a new electrical panel schedule.
    Plan out which circuits you will be monitoring
    Verify those circuits with a working tester or meter.
    Changes may have occurred, check and double-check.
    For extended “in-panel” work get portable lights and turn off the main breaker.
    Remember: the wires leading to the main breaker remain energized even when off.
    Caution: remember to plug in the current transformers in to the base unit before
    you clamp them around an energized wire.
    The Iotawatt is an amazing value for monitoring my panel and solar array output.

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