From the brand
Why is my CT reading showing a negative value?
This issue may arise from incorrect wiring or settings. Fix it by inverting the current direction via the ‘Circuit Factor’ page in device settings; no need to physically alter the current transformer. Firmware update is required.
Can I monitor the net metering of my solar system?
Yes, Refoss EM16 can accurately monitor the net metering of your solar system.
Is the data being monitored accurate?
The energy monitor is rigorously calibrated to provide high-precision energy consumption data with an accuracy of 98%. For any questions, We’re here to help.
Is cloud data free?
Yes, Refoss offers free cloud services that can store historical consumption data for up to 3 years.
How to set up power consumption alerts?
In the Refoss app, click on the “Power Alert” option and customize the consumption threshold for each channel. The system will automatically notify you when the power consumption reaches the set value.
Can it be used with Home Assistant?
Yes, it is compatible with Home Assistant. After integration, you can monitor power consumption in real-time and set up automation scenarios directly from the Home Assistant dashboard.
✨NEW✨ Feature Release (25.07.30): 1.Merge channels; 2.Export hourly-level energy data; 3.Access the new energy statistics page; 4.Invert CT readings directly via Device Settings → Circuit Factor (no physical flipping needed!). Update to the latest Refoss app and firmware to enable all features.
Refoss Smart Home Energy Monitor: Supports 2 main circuit sensors (up to 200A each) and 16 branch circuit sensors (up to 60A each) with an 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 and includes a 2-year warranty. Attention: Take care in accessing the included current transformer and avoid bumping it to prevent damage.
24/7 Energy Monitoring: With the Refoss app, you can track your home’s energy usage anytime, anywhere. Easily monitor the power, current, voltage, and power factor of major appliances like air conditioners, stoves, and water heaters. Quickly identify which devices are running efficiently and which ones might be wasting electricity. According to statistics, many users save an average of 10%-20% on their energy bills by optimizing appliance usage.
Zero Feed In Automation: The EM16 is a smart meter designed for solar owners, linking with Home Assistant to automate your zero feed-in strategy. Ideal for homes with solar panels, it detects solar surplus (like midday sun peaks) and automatically powers high-energy appliances – such as activating your washing machine, EV charger, or water heater – to consume excess solar energy onsite. This prevents low-value electricity feed-ins to the grid, maximizing your solar investment returns and slashing utility bills.
Comprehensive Energy Data: The power monitor provides 98% accuracy and stores up to 3 years of detailed electricity usage data. With clear minute, hour, day, month, and year consumption and cost charts, you can easily understand your energy use. Ideal for homeowners adjusting appliance usage to save on bills or businesses tracking long-term energy savings and emission reductions. Historical data can also be exported for further analysis, making every electricity expense transparent.
Smart Consumption Alerts: You can set personalized usage targets for each circuit. Once the system detects an unusual energy spike—such as a sudden increase in power consumption by an appliance that exceeds the normal range—you will immediately receive a detailed alert notification. This allows you to take prompt action, such as checking if there is a malfunction with the device or adjusting your usage habits, thereby optimizing appliance usage across different times of the day.
Compatible with Home Assistant: EM16 Wi-Fi Energy Monitor is now compatible with Home Assistant! Simply update the firmware in the Refoss app to seamlessly integrate your energy management system with your smart home platform, enabling centralized control and automation. Additionally, all data is stored locally, ensuring your privacy is protected without cloud processing. API is not supported.
Surajmal Rathee –
Great Whole-Home Energy Monitor with Home Assistant Support!
I’ve been using the Refoss Smart Energy Monitor for a week now, and I’m thoroughly impressed. One of the standout features is its local integration with Home Assistant, which is precisely why I chose this energy monitor.The instructions were straightforward, and the video on the Amazon listing was particularly helpful, guiding me through the entire installation process. It should be relatively easy for anyone with basic electrical knowledge and some handy skills. However, I recommend doing some pre-planning before installation to determine which circuits you want to monitor. There are five L1 circuit sensor, five L2 circuits sensor, and six circuits sensor that can be used on either L1 or L2. You’ll need to choose one or the other. Additionally, you can combine some circuits and use one clamp for them, as long as they don’t exceed the current limit of the circuit sensor. For instance, I combined two kitchen outlets into one, saving me a sensor I used for monitoring a different.For balanced 240V loads like an AC unit or an EV charger, you can use one clamp and then change the circuit factor to 2 in the Refoss app or create a helper in Home Assistant that multiplies the energy usage by 2. This is because with balanced loads, the energy drawn on both lines is the same, which is why it’s called a balanced load. This way, you can save a sensor to monitor another circuit. I highly recommend making a note of which sensors are connected to which circuits to avoid wasting time trying to remember where you connected them.Setting up the energy monitor on the app was a breeze. I simply downloaded the Refoss app, followed its instructions to connect it to Wi-Fi, and updated the software of the energy monitoring module. The Refoss app allows you to monitor live energy usage for each connected circuit and view a history of energy usage for each circuit, broken down by day, week, month, and year which is awesome for using the app on its own.Connecting to Home Assistant was equally easy. I searched for the Refoss add-on, and the energy monitor was automatically detected on my network. It brought over all the entities shown in the Refoss app and then I got to setting up everything in home assistant.Overall, I highly recommend this affordable and reliable whole-house energy monitoring system. If you use Home Assistant, this is one of the best options out there that is supported natively through the Refoss addon.
MrsSand –
Smart Home Energy Monitor – Worth It!
This energy monitor is awesome if you’re into smart home setups. It works with Home Assistant, tracks your electricity use in real time, and helps cut down your bill with smart alerts for weird spikes—like appliances running when they shouldn’t.The latest update added some cool features: you can merge circuits, export hourly data as CSV, flip sensor readings without rewiring, and check out a cleaner dashboard.It’s great for solar setups too—automatically powers your EV charger or water heater when solar is peaking, so you don’t feed energy back to the grid. You get up to 36 months of data stored in the cloud, and the app makes it easy to spot what’s wasting power.Setup is simple, it supports a bunch of system types, and the sensors are solid (just handle them carefully). Overall, super useful and easy to manage!
Ryan –
Solid Hardware, Great for Home Assistant, App Just Needs Some Love
So far, the Refoss 16-channel power meter has been pretty solid. Install was straightforward, and the hardware feels high quality — about on par with Sense or other higher-end monitors I’ve used. My only small gripe on the hardware side is that it’d be nice if Refoss offered some CT clamp extension cables to help clean up wiring in a 200-amp panel. I have had no issue with the units integrated wireless receiver and it has been very reliable.The app itself is decent, but if you’re coming from Sense, it’s definitely a step down in polish. There’s no device detection or load learning, which feels like a weird omission these days. I’d love to see options to merge CTs in the app or have a bit of smart recognition when certain appliances (like the fridge or microwave) kick on.That said, this thing absolutely kills it with Home Assistant. That’s really where it shines. Setting up automations and triggers off individual clamp readings has been way more reliable than Sense ever was, and honestly, that alone makes it worth the upgrade.Overall, the Refoss delivers great hardware, accurate readings, and solid integration potential. The app could use some love, but if you’re the kind of person who enjoys tinkering and wants full control over your power data, this is a great pick.
Rishik Keshari –
Excellent Smart Energy Monitor
The Meross Smart Home Energy Monitor works really well. Setup was simple and the instruction manual is really easy to follow. I like the build quality of the product and it comes with a lot of accessories. It gives accurate real-time readings and connects nicely with wifi. I like it tracks energy use in detail and the data can be downloaded from the app. Overall, it’s a reliable and useful tool for keeping an eye on home/business energy consumption.
Amir –
I have been trying out the Refoss EM16 Smart Energy Monitor for a while now, and I must say, I’m impressed. It was easy to install—good instructions and helpful online videos meant the whole process was simple and quick. Took about an hour to have everything up and running, and all plugged in to the Refoss app successfully.I like best that this product is so versatile and thoughtful in design. You can just plan and label your circuits ahead of time, and if a clamp is showing up in the negative direction, you can simply reverse it in the app without the need to rewire. If you require additional circuits to be monitored, you can bus their wires together into a CT so long as they’re on the same phase. The application is simple to operate, giving real-time monitoring of all the circuits, and detailed energy history by day, week, month, or year.Home Assistant support is where this product really shines. EM16 auto-commands and provides complete local access to all the data of each circuit, enabling advanced automation without the cloud. Solar system owners will love Zero Feed-In Automation—putting extra solar energy to use powering devices such as EV charging points or water heaters rather than returning it to the grid.The recent firmware releases saw the addition of various useful features, including channel merging, export of CSV data, improved dashboards, and inverting CT readings in software. The releases show that Refoss is refining the product according to feedback from users.Overall, the EM16 is a wonderful, budget-friendly energy monitoring system—easy to install, full of data, and ideal for smart home residents as well as anyone wishing to gain better control of and track their home energy usage. Highly recommended.
Tom –
I’m very happy with the EM 16. It does everything I was hoping it would. Install was easy. It took max 30 minutes once I got started. The app connected without issue.I installed all circuits as called out in the instructions but some circuits were showing negative power (as in energy flowing back to the grid) which was definitely not correct. I think that has more to do with my house but either way there are 2 ways to fix that. Either flip the clamp or set the power factor to -1 in the app which is essentially the same as physically flipping the clamp.The Home Assistant integration is great. There’s almost no setup to connect it. The integration is native so when I added it to Home Assistant it connected itself to the EM16 without any additional inputs.Tips:- Install is really simple, power off to the whole house, connect the WiFi antenna, connect the power lead directly to a circuit, attached the clamps.- Do some planning before install. Consider which circuits should be monitored if you have more than 16. I wrote it out on excel first which made revisions before I started the install easy. It also made it easy to rename the circuits in the app after setup was complete- Mark the circuits you’ve planned on the breakers since the circuit numbers won’t be visible when the panel cover is taken off.- There are 3 types of clamps, A, B, and C. A and B clamps need to be on different phases. C clamps need to adopt either the A phase or the B phase but they can’t be on both. On North American panels, generally, each row of circuits (assuming the panel is oriented with the long edge vertically) is on a single phase. That means starting at the top of the panel and working down each row alternates phases.The photo with the panel cover is after the install. Apart from an antenna there’s no sign of the EM16.
Chris. –
I was pleasantly surprised by how easy this device was to install. The documentation is clear, well-structured, and provides all the necessary details to get started quickly.If you need extra help, there are also several installation videos available online, which can guide you step by step. Personally, I was able to complete the installation in about one hour without any major issues. It really is just a matter of following the instructions.Once the hardware is in place, all you need to do is download the Refoss app on your phone, and the setup takes just a few minutes.What I really appreciate is that it’s also compatible with HomeAssistant for those into home automation. It integrates smoothly and is very easy to configure.Overall, this product is extremely simple to install compared to other, much more complex solutions I’ve used in the past. Highly recommended for anyone looking for an easy-to-use smart energy monitor.
Shawn OReilly –
I self installed this on my 200amp panel and it works very well. Installation was straightforward as long as you’re comfortable doing work inside the panel (make sure the power is off!). It’s been really useful to see where unexpected power draws are coming from, such as a heater in one of my adult children’s rooms that I did not know about! Recommended for all who enjoy having details of what’s happening in their house.