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frontpage Posted by ficky23 • Last Tuesday

Refoss Smart Home Wi-Fi/Bluetooth Energy Monitor System w/ 16x 60A Circuit Sensors

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$158

$200

21% off
Amazon
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Deal Details
Amazon has Refoss Smart Home Wi-Fi & Bluetooth Energy Monitor System w/ 16x 60A Circuit Sensors (EM16) on sale for $157.49. Shipping is free.

Thanks to Community Member ficky23 for sharing this deal.

About this product:
  • Supports 2 main circuit sensors (up to 200A each) and 16 branch circuit sensors (up to 60A each) with easy-to-install clamp-on design. Compatible with single-phase 2-wire systems, single-split phase 3-wire systems, and 3-phase 4-wire Wye systems with earthed (TN or TT) neutral (no Delta). Easily installs in most home circuit panels.
  • Keep track of your home's electricity usage anytime, anywhere with the Refoss app. Easily monitor power, current, voltage, and power factor for major appliances like air conditioners, furnaces, and water heaters. Track real-time electricity usage data to see what's running and identify what's consuming power.
  • Identify energy-hungry appliances, and set usage goal for each circuit. You'll receive alerts for unusual energy spikes, and take proactive steps to lower your electricity bills and save more energy.
  • The Refoss energy monitor offers 98% accuracy and can store up to 36 months of data. Easily access detailed electricity usage and cost graphs by minute, hour, day, month, or year, giving you deep insights into your energy consumption and empowering you to make smarter energy decisions.
  • Specs:
    • Power Supply: 100-240V~, 50/60Hz
    • Supported System:
      • Single-phase, 2-wire systems
      • Split-phase, 3-wire systems
      • Three-phase, 4-wire Wye systems with earthed (TN or TT) neutral (no-Delta)
    • Voltage-current Correspondence:
      • Red -> A1~ A6, Power
      • Green -> B1~ B6
      • Black -> C1~ C6
    • Main Current Transformers:
      • Max Primary Current: 200A
      • Max Voltage: 250V (Primary) / 333mV (Secondary)
      • Burden Resistor: 7.2ohm, 1%, 62.5mW
      • Cable Length: 1m
      • Inside Diameter: 24mm
    • Branch Current Transformers:
      • Max Primary Current: 60A
      • Max Voltage: 250V (Primary) / 333mV (Secondary)
      • Burden Resistor: 18.2ohm, 1%, 62.5mW
      • Cable Length: 1m
      • Inside Diameter: 10mm
  • Includes: Home Energy Monitor, Wi-Fi Antenna Assembly, 2x 200A Current Transformers, 16x 60A Current Transformers, 2x 3.5mm Insulation Plugs, 16x 2.5mm Insulation Plugs, 3x Wire Nuts, 3x Extra Wires, Wire Harness, User Manual

Editor's Notes

Written by jimmytx | Staff
  • About this Store:
  • Additional Information:
    • This offer is $12.50 less (7% savings) than our front page deal price of $169.99 from September 2024 which earned over 25 thumbs up.
    • Rated 4.5 out of 5 stars on Amazon based on over 45 customer reviews.
    • Please see the original post for additional details and/or view the Wiki and forum comments for further helpful discussion if available.

Original Post

Written by ficky23
Product Info
Community Notes
About the Poster
Deal Details
Product Info
Community Notes
About the Poster
Amazon has Refoss Smart Home Wi-Fi & Bluetooth Energy Monitor System w/ 16x 60A Circuit Sensors (EM16) on sale for $157.49. Shipping is free.

Thanks to Community Member ficky23 for sharing this deal.

About this product:
  • Supports 2 main circuit sensors (up to 200A each) and 16 branch circuit sensors (up to 60A each) with easy-to-install clamp-on design. Compatible with single-phase 2-wire systems, single-split phase 3-wire systems, and 3-phase 4-wire Wye systems with earthed (TN or TT) neutral (no Delta). Easily installs in most home circuit panels.
  • Keep track of your home's electricity usage anytime, anywhere with the Refoss app. Easily monitor power, current, voltage, and power factor for major appliances like air conditioners, furnaces, and water heaters. Track real-time electricity usage data to see what's running and identify what's consuming power.
  • Identify energy-hungry appliances, and set usage goal for each circuit. You'll receive alerts for unusual energy spikes, and take proactive steps to lower your electricity bills and save more energy.
  • The Refoss energy monitor offers 98% accuracy and can store up to 36 months of data. Easily access detailed electricity usage and cost graphs by minute, hour, day, month, or year, giving you deep insights into your energy consumption and empowering you to make smarter energy decisions.
  • Specs:
    • Power Supply: 100-240V~, 50/60Hz
    • Supported System:
      • Single-phase, 2-wire systems
      • Split-phase, 3-wire systems
      • Three-phase, 4-wire Wye systems with earthed (TN or TT) neutral (no-Delta)
    • Voltage-current Correspondence:
      • Red -> A1~ A6, Power
      • Green -> B1~ B6
      • Black -> C1~ C6
    • Main Current Transformers:
      • Max Primary Current: 200A
      • Max Voltage: 250V (Primary) / 333mV (Secondary)
      • Burden Resistor: 7.2ohm, 1%, 62.5mW
      • Cable Length: 1m
      • Inside Diameter: 24mm
    • Branch Current Transformers:
      • Max Primary Current: 60A
      • Max Voltage: 250V (Primary) / 333mV (Secondary)
      • Burden Resistor: 18.2ohm, 1%, 62.5mW
      • Cable Length: 1m
      • Inside Diameter: 10mm
  • Includes: Home Energy Monitor, Wi-Fi Antenna Assembly, 2x 200A Current Transformers, 16x 60A Current Transformers, 2x 3.5mm Insulation Plugs, 16x 2.5mm Insulation Plugs, 3x Wire Nuts, 3x Extra Wires, Wire Harness, User Manual

Editor's Notes

Written by jimmytx | Staff
  • About this Store:
  • Additional Information:
    • This offer is $12.50 less (7% savings) than our front page deal price of $169.99 from September 2024 which earned over 25 thumbs up.
    • Rated 4.5 out of 5 stars on Amazon based on over 45 customer reviews.
    • Please see the original post for additional details and/or view the Wiki and forum comments for further helpful discussion if available.

Original Post

Written by ficky23

Community Voting

Deal Score
+42
Good Deal
Get Deal at Amazon

Price Intelligence

Model: Smart Home Energy Monitor Supports Home Assistant, Real-Time Accurate Energy Consumption Tracking, Electricity Usage Monitor with 16x60A Circuit Sensors, 36-Month History, Solar Metering, 2.4G

Current Prices

Sort: Lowest to Highest | Last Updated 7/16/2025, 02:50 AM
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Amazon$157.49

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Top Comments

GreenRose9133
67 Posts
42 Reputation
Keep in mind that UL certification means nothing as far as product performance. It's purely safety related and since this unit is low voltage powered and the CT's are split core, there is not interaction with any system voltage apart from measuring voltage and the magnetic field around your wires. It's like installing a bunch of clamp meters on the circuits and having a multimeter measuring voltage on one circuit to perform the power calculations. While UL is always a must for systems powered by AC voltage, it's not as critical for a low voltage system like this this.
dnguyen800
441 Posts
129 Reputation
Emporia Vue is also another option and should be UL certified. Works with Home Assistant but cloud only unless you flash the firmware
Formless
878 Posts
357 Reputation
The Vue 2 and 3 units flashed to ESPHome have been bulletproof for me. I actually just decommissioned my iotawatt in favor of more emporia units to have more expansion ability.

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181day
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Better than Sense?
Original Poster
Pro
Last Tuesday
37 Posts
Joined Jun 2011
Last Tuesday
ficky23
Original Poster
Pro
Last Tuesday
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Quote from 181day :
Better than Sense?
Sense doesn't have circuit sensors, so you won't have that level of granularity for energy monitoring. Also, requires using their app and relying on cloud data (not sure if they have home assistant integration). If Sense were to go out of business, you would potentially lose all your historical data.

However, sense is UL certified, and I know my solar installer offers installing it for my system (where-as they won't install anything else).
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dnguyen800
Last Tuesday
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Our community has rated this post as helpful. If you agree, why not thank dnguyen800

Emporia Vue is also another option and should be UL certified. Works with Home Assistant but cloud only unless you flash the firmware
1
Last Wednesday
878 Posts
Joined Aug 2009
Last Wednesday
Formless
Last Wednesday
878 Posts
Quote from dnguyen800 :
Emporia Vue is also another option and should be UL certified. Works with Home Assistant but cloud only unless you flash the firmware

The Vue 2 and 3 units flashed to ESPHome have been bulletproof for me. I actually just decommissioned my iotawatt in favor of more emporia units to have more expansion ability.
Last Wednesday
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Joined Dec 2013
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greguar
Last Wednesday
231 Posts
can extra sensors be purchased or is the cutoff 16?
Last Wednesday
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TehZombie
Last Wednesday
164 Posts
Quote from greguar :
can extra sensors be purchased or is the cutoff 16?
It has a max of 16 input ports (8 on each side). So extra sensors wouldnt have anywhere to plug in
1
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BeepBopBeep
Last Wednesday
2,623 Posts
I bought this one and returned it as it was not UL listed/certified. I ended up getting Vue 3
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LiquoredOnLife
Last Wednesday
191 Posts
Emporia also offers flexible current transformers for the main bus bars which were required in my setup.
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dman_97
Last Wednesday
240 Posts
What do you do with the information you collect with this? This looks like more that than a 1 time use to find an appliance consuming too much power.
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GreenRose9133
Last Wednesday
67 Posts

Our community has rated this post as helpful. If you agree, why not thank GreenRose9133

Quote from BeepBopBeep :
I bought this one and returned it as it was not UL listed/certified. I ended up getting Vue 3
Keep in mind that UL certification means nothing as far as product performance. It's purely safety related and since this unit is low voltage powered and the CT's are split core, there is not interaction with any system voltage apart from measuring voltage and the magnetic field around your wires. It's like installing a bunch of clamp meters on the circuits and having a multimeter measuring voltage on one circuit to perform the power calculations. While UL is always a must for systems powered by AC voltage, it's not as critical for a low voltage system like this this.
4
1
2
Original Poster
Pro
6d ago
37 Posts
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6d ago
ficky23
Original Poster
Pro
6d ago
37 Posts
Quote from dman_97 :
What do you do with the information you collect with this? This looks like more that than a 1 time use to find an appliance consuming too much power.
If you like to have historical data (whole house energy consumption, solar generation) this helps you collect the information for that.

While you can use their third party app, I'm personally more interested in storing that data locally via home assistant (server local in your home) and avoiding having my data on the cloud all together. You can view historical data (charts) in home assistant dashboard on your phone or PC (browser).
1
5d ago
222 Posts
Joined Oct 2006
5d ago
Byaka
5d ago
222 Posts
No matter how I look at this I simply cannot see why I would need a thing like this. I cannot imagine myself checking the app to see what rooms consume more electricity compared to others. Just turn the damn lights off if you're not in the room. Those of you who already have a similar device, how did your life improve after installing it? Just curious
1
8
5d ago
887 Posts
Joined Nov 2017
5d ago
181day
5d ago
887 Posts
Quote from Byaka :
No matter how I look at this I simply cannot see why I would need a thing like this. I cannot imagine myself checking the app to see what rooms consume more electricity compared to others. Just turn the damn lights off if you're not in the room. Those of you who already have a similar device, how did your life improve after installing it? Just curious
I have a similar product (sense) and it helps me identify what devices are using too much power, notification if it stops working like a freezer, surge notifications, solar info, etc. There's all kinds of uses but I try to keep my energy under a certain amount otherwise I pay almost double.
1
5d ago
180 Posts
Joined Jan 2016
5d ago
Vindicate3784
5d ago
180 Posts
Quote from Byaka :
No matter how I look at this I simply cannot see why I would need a thing like this. I cannot imagine myself checking the app to see what rooms consume more electricity compared to others. Just turn the damn lights off if you're not in the room. Those of you who already have a similar device, how did your life improve after installing it? Just curious

It can help you identify potential problems with well pumps, septic, water heaters, etc that would otherwise be difficult to pinpoint when they're malfunctioning.

I bought mine to track why my energy usage was high and I have it send me notifications when something has been left on and running for awhile like when someone forgets to turn off the base board heat.
1

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5d ago
1,836 Posts
Joined Dec 2004
5d ago
beware
5d ago
1,836 Posts
Quote from Byaka :
No matter how I look at this I simply cannot see why I would need a thing like this. I cannot imagine myself checking the app to see what rooms consume more electricity compared to others. Just turn the damn lights off if you're not in the room. Those of you who already have a similar device, how did your life improve after installing it? Just curious

So my bill shot up about $10 a day now that we're in the heat of summer. I've switched my pool pump to running at night, tweaked my 3 ecobees that control a damper system, and discovered my hybrid water heater had a bad thermoresister. That's not running any lights during the day. All appliances just sucking power. I'm already saving over $10 a day. This is why a system that can tell you how much a circuit is running you can identify and tweak.

My 4000+sqft house has over 60 breakers on 400 amps of service.

Go ahead and turn off a LED light and see how much electricity I save...
Last edited by beware July 11, 2025 at 03:08 PM.
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