North America Bundle (120V)

(14 customer reviews)

From: $173.30

Basic bundle for typical North American 120V service.

  • Split-phase 120V/240V (REQUIRES 2 MAINS CTs)
  • Three-phase 120V/208V
  • Up to 12 branch circuits
  • Handles solar and net metering

Note: There are no CTs included by default.  You must select all needed, including mains. Pictures representative of available products, not actual order.

See description below for details

IoTaWatt Standard Base V5

Integrated Wall Mount
Allows direct-reference three-phase


In stock

9V AC Reference Transformer 120V US Plug

Voltage Reference Transformer
120VAC to 9VAC

$10.50 each

In stock

USB Power Supply (US Plug)

Powers Base Unit. US Plug


In stock

AccuCT 200A x 25mm split-core

Monitors Mains
Up to 200 Amps
Opening 1" (25mm)

$18.20 each

In stock

Current Transformer 200A x 25mm clamp-on

  • Use for Mains
  • Maximum 200 Amps
  • Opening 25mm
$20.30 each

In stock

AccuCT 100A x 16mm split-core

Use for 100A mains, branch-panels, and high-load appliances.
Up to 100 Amps
Opening .63" (16mm)

$11.20 each

In stock

AccuCT 50A x 10mm split-core

Monitor Branch Circuits and Solar Inverters to 12kW
50 Amp
Opening 0.4″ (10mm)

$8.40 each

In stock



Use for North American 120V service. Must choose at least two CTs for Mains.  Specify 2x200A CTs (split-core or clamp-on) or 2x100A CTs to measure total usage of a typical 200A/100A split-phase service.  Add a third main CT for three-phase.  Requires WiFi and a nearby 120V duplex receptacle for the USB power supply and AC reference transformer.

  • Add a 50A CT to the bundle to monitor solar inverter up to 12kW.
  • Add up to 12 additional CTs to monitor individual circuits.
  • Open source firmware preloaded with optional automatic update.
  • Can be used with commercial three-phase power systems.
  • Stores high resolution data for more than 10 years.
  • All connections plug and jack.
  • ETL certified to UL standards.

Bundle includes:

  • IoTaWatt Base
  • USB Power Supply
  • AC Reference Transformer


  • 200A or 100A CTs for mains (Requires 2)
  • 100A CTs for large loads and branch panel feeds
  • 50A CTs for branch circuits

Additional Features:


14 reviews for North America Bundle (120V)

  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.

  10. Nathan Zohner (verified owner)

    Purchased August 2020. Installation and setup was a breeze, from unboxing to charting all channels was a few hours (including running current transformers through wall).
    Was worried this would require too much tweaking- but I’m happy to report this just worked and the instructions on this site get you setup quickly without any fuss.

    (I was going to get a sense.. and went with iotawatt for the capability to see total power and 12 consumer circuits… after a few days data this was defiantly the right choice!)

    Nathan Z

  11. rwilson07733

    I bought a NA Bundle to monitor the energy use of my new Tesla, but also bought CTs to monitor my solar generation and A/C power usage. The IoTaWatt and revenue grade meter on the Solar system agree within a % so far and given the connections, it is probably better than that. Monitoring the A/C, I discovered that my Carrier high efficiency units draw 38W each when the temperature falls below ~67F This adds up to a lot over the winter, so I will turn off their breakers in the Fall. This accidental discovery will eventually pay for the bundle. I am very happy that I discovered IoTaWatt in a review for Sense on Amazon. It was significantly easier to install than other units which require a hard wired voltage sense and makes it easy to monitor other things. I will probably buy some more CTs. Bob’s help was fast and effective in my understanding the system.

  12. Tom Ewing (verified owner)

    I am so impressed with IoTaWatt! A friend who is an engineer and works at a local solar/battery installer suggested IoTaWatt. I was a little concerned about installing the CTs in my electrical box but it turned out to be super easy. I had everything mounted, installed and up and running in about 90 minutes. I was sure that I would have some sort of issue with the hardware, communications or software but everything went really smoothly. My immediate interest in the IoTaWatt was to determine what size backup generator I would need and even after a few days I had really useful information about how shedding certain non-essential loads during an emergency could effect my generator sizing and fuel storage requirements. I also plan to use the data to size a battery backup system in the future. I hardly ever review products but I am so impressed and pleased that I really wanted to share my enthusiasm.

  13. Khanh Do Ba (verified owner)

    I live in an old (i.e., not well-insulated) townhouse with all-electric heating, so I’d been looking for a way to track usage with more granularity than just reading my meter once a day. Came across IoTaWatt in the Hubitat community because someone there had written an integration with IoTaWatt, and it looked to tick all my boxes: accurate direct measurement of branch circuits (I’d read enough bad reviews of Sense’s ML approach), completely local (also why I use Hubitat), and active support from both the manufacturer and the community. I’ve had everything up and running for a few weeks now and I have to say it’s exceeded my expectations.

    I’ve done a decent amount of electrical DIY work in the past, but never tinkered much inside the panel, so I was expecting a bit of a challenge. But everything ended up being pretty straightforward*, and basically just worked on the first try (as a software engineer that always surprises me). Just using the built-in interface (especially Graph+) would probably have been everything I needed, but setting up a Raspberry Pi running InfluxDB and Grafana to upload to was easy enough (though that probably took me longer than installing the IoTaWatt in the first place).

    * If you don’t hire an electrician, do make sure you know what you’re doing and take all safety measures.

  14. Harold (verified owner)

    I purchase IOTAWATT in October 2019 and have had it running for over 18 months and am very impressed with the results. All the equipment has worked flawlessly and the resulting information has been very helpful in reducing our use, and knowing where it is going. The limit on circuit CTs was explained well and I combined several items we seldom use with items I can identify easily, IE dishwasher(seldom) with Refrigerator (consistent pattern) and stove and Microwave, well and water heater, 4 bedroom circuits on one ct so more of my use has good detail. quick and easy graphs to understand well and easy to summarize for any period you choose. Have recommended to other interested in knowing more about where their electric is used.

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