Smart Home Energy Monitor Supports Home Assistant, Real-Time Accurate Energy Consumption Tracking, Electricity Usage Monitor with 16x60A Circuit Sensor, 36-Month History, Solar Metering, ETL Certified

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.

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!

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.

I couldn’t be happier with the Refoss EM-16! I love having a smart home and I enjoy adding tech that makes our lives easier, is simple to use, and just makes sense. I shopped around for an energy monitoring system for a while and decided the Refoss EM16 was the way to go. This was the right choice! The installation was far simpler than I expected. The included headphone-jack style connectors made wiring a breeze — no tiny screws or fiddly clamps to deal with. I had read reviews that talked about the extra wire since these can’t be trimmed, but as you can see in the before and after photos of the breaker panel, the slack is easily manageable. Refoss labels all the clamps to make attaching clamps and connecting to the unit a breeze. I took my time to be cautious, and I was still able to hook everything up and have it running in two hours, without any special tools. The EM16’s connection to my WiFi is strong and it hasn’t dropped at all. Refoss gives you all you need to connect your power wires including the wire nuts and extra wire. I was extremely happy and slightly surprised to see how well the instructions are written and easy to follow; no missing words or “lost in translation” instances at all. To make your install fast and easy, plan out in advance what circuits you want to monitor. You can also use a single clamp across two wires (in the case of dual breaker circuits like A/C or hot water heater), allowing you to use more clamps to monitor more circuits. The app itself is outstanding. It guided me step-by-step through setup and immediately started giving me clear, real-time data. The interface is clean and intuitive, making it easy to see my usage at a glance and drill into details when I want to. You can set alerts and automations easily through the app. You can also plug in your price per kWh for power and the app will tell you what your current cost are (see pics). This even helped me to find I had two circuit breakers mislabeled and one isn’t even connected to anything! Our home is only 7 years old and that wasn’t found by two previous home inspections! Since I love home automation, integration with Home Assistant is important to me and the process with Refoss was seamless. Once connected, it showed up right away and has been rock-solid ever since. I can automate notifications, track energy trends, and even display the data on my dashboards with minimal extra effort. I even have automations to turn lights different colors when the clothes washer or dryer is done so we don’t forget to dry and fold them. Overall, the Refoss EM-16 is a fantastic product if you want reliable energy monitoring with minimal setup hassle and full smart-home integration. I only wish I had bought and installed this sooner! Highly recommended!

When I received this product, I was initially impressed by how solid it felt in my hand. It is heavy and feels extremely well-made. The provided instruction manual was intuitive and written in perfect English (based on experience, this is a HUGE plus). After cutting the main breaker that feeds my electrical panel, I was able to remove the panel cover and install the device in under an hour. I initially had a little trouble routing the wi-fi antenna, but finally decided to let it hang from the bottom of my box. In an installation with a surface-mounted panel, this would be much easier. My only issue with the installation was cosmetic. The wires running from the clamps to the device's brain use molded plugs and cannot be adjusted for length. It would be a neater installation if these cable lengths could be customized, but I consider this nitpicking, and it did not change my initial rating of the product. Since I had already installed the Refoss garage door controller at the house, I already had the application on my iPhone. Adding the power monitor was as easy as hitting the "+" in the app to add it to the dashboard. After a little configuration of my circuits, so that 240-volt breakers appeared as a single device, the installation was complete. The app was now showing me the power consumption of my monitored circuits in real-time. While the device works exactly as designed, and the installation went flawlessly, the app could provide me with clearer information. The real miss in the application is the inability to rename (or even add footnotes) to the circuits. If they could add this ability, it would make a huge difference. You should also be able to arrange the circuits in a custom order so that my mains could appear at the top of the app rather than being listed in alphabetical order. All in all, this is a great little device that will provide me with excellent insight into my power consumption at home, enabling me to make informed decisions about sizing a solar system in the future. It will also show me where I can reduce power usage when I need to look at installing an emergency generator.

The popularity and availability of energy monitors has exploded in recent years which makes sense as electric rates have increased along with an increasing awareness of the importance of being more energy conscious. I have a solar system with Enphase micro inverters which gives me a whole house overview of consumption at the meter but it's only a sum of all of the circuits. So far I had been holding off on a more granular solution and waited for the market to mature a little more. Until now. This Refoss system gives that next level of detail and allows viewing of each individual circuit. My house is a little different as everything is electrified including two electric cars so I have a pair of 200A panels instead of a more common single 100 or 200A panel. That means to cover everything I need two of these units as each has a separate 200A feed. I don't know if there is enough capacity to support a single 400A feed but the main current sensors have some extra space so it may fit. But I can confirm that they work perfectly on the 200A feed. Installation is very easy and is plug and play without needing any contact with the conductive parts of wires with the exception of the power supply to the unit itself. It's most convenient to install it on a dedicated breaker which is what I did. Other than that, all of the sensors are added to existing wires without having to touch any energized contacts or disconnect anything. It's extremely easy. On the other end they plug into the main box. The wires are long which means they'll reach from anywhere and it does mean that there will be a bit extra more than necessary inside the panel but it's all hidden with it closed. It's the compromise to having plug and play connections which I prefer over having spring contacts that can work loose and be less reliable and with higher impedance. The sensors themselves are extremely high quality with mirror finished faces that mate up firmly which means they'll be quite accurate. The app works well and unlike my Enphase app gives per-connection details. As others have noted I wish it could be configured with a custom map and labels based on a photo of the panel even, but it's perfectly functional as it is.

I’ve been using the Refoss Smart Home Energy Monitor (EM16) for a few weeks now, and I’m seriously impressed with what it offers. As someone with a solar setup at home, I was particularly drawn to the Zero Feed-In Automation feature—and it works beautifully. Now, instead of sending excess power back to the grid for pennies, the system smartly kicks on high-energy appliances like my water heater and EV charger when solar output peaks. It’s already making a noticeable dent in my utility bills. Installation was straightforward with its clamp-on design, though I'd recommend a bit of caution when handling the current transformers as instructed. Once installed, everything syncs quickly with the Refoss app, which is clean and user-friendly. You get real-time data for each connected circuit—power, voltage, current, and power factor—plus clear breakdowns by minute, hour, day, and even year. The recent update (July 2025) added some killer features: ✔ Merge channels ✔ Export hourly-level data ✔ New energy stats page ✔ Invert CT readings without physically flipping the wires (huge time-saver)Another highlight is the smart alerts. I set thresholds for various appliances, and when something goes over the limit—like my dryer running longer than expected—I get an instant push notification. Great for both safety and savings. Also, it integrates with Home Assistant, which lets me automate energy usage smarter than ever. I love that all data stays local—no cloud dependency, which is a big privacy win. Only downside? It doesn't support Delta 3-phase, but for typical residential setups, this thing is perfect. Bottom line: Whether you're just energy-conscious or running a full solar + smart home setup, the Refoss EM16 is absolutely worth it. I’ve already seen more control over my energy usage and expect long-term savings. Highly recommend!

Mostly does what it claims, if you read and understand the fine print. Overall, the install was about 2 hours, but there wasn't enough room in the bottom of the breaker panel for the box to fit. I ended up putting it near the top, but had to use a separate wifi antenna extension cable. Also, the instructions lead you to put the CT's on backwards. Other reviews mentioned getting them backwards, so I was super careful to follow the directions. All of the CT's reported negative values and needed to be flipped over. The meter has 18 CT's, but they are split over 3 phases. Since US consumer power is pretty much all 2 phase, this means you have to pick one of the 2 phases for your last set of 6 CT's. Basically, you get 6 CT's on one phase and 12 on the other, making actually using all 18 CT's really difficult. I ended up just prioritizing my 240V loads with this meter, and using zigbee smart plugs to measure 120V loads instead. There are a bunch of unused CT's still sitting in the box because I can't effectively use them to measure anything interesting. Power, voltage, and energy metrics all look reasonable (e.g. ~4600W on my hot water heater rated for 4500W), but current is often obviously wrong at low power draws. For example, it claims my heat pump is drawing ~32W at idle, but somehow also pulling 5A at 240V, which is just laughably wrong. I confirmed other people have the same issue by looking at their app screen shots. If you do the math, the numbers often don't add up. Higher loads seem better for some reason. I don't use the app (which seemed mediocre at best). I have a custom influx/grafana setup where I put all my other metrics, so I reverse engineered the Refoss Home Assistant integration off of github and wrote my own bit of software to poll the device via http (search for refoss_ha; userkey is "meross" by default). The protocol is vastly over complicated, but I did get it working. I had to hard reset the device multiple times, once by physically pulling the power because the reset button wasn't affective. I was also annoyed to find out recently that there is apparently an improved EM16P being launched "soon", which is supposed to make the software integration reasonable. Well, it's installed and technically working so I'm not going to rip it out, but that doesn't feel great.