Buy Now, Pay Later
As low as
$26.66
/ mo
Learn more
- – 6-month term
- – No impact on credit to apply
- – Instant approval decision
- – Secure and straightforward checkout
Ready to go? Add this product to your cart and select a plan during checkout.
Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Free shipping on this product
30-day returns
Learn more
FREE 30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
Only 10 left in stock, order soon!
Arrives
Tuesday, Sep 8
Recently Viewed
Features
- EM16P MODEL & LOCAL CONTROL & DATA PRIVACY: Access your home energy monitor data locally via Built-in Web UI, Open API, and MQTT without relying on cloud services. Unlike cloud-dependent monitors, Refoss ensures your data stays within your home network. Direct local access protects your privacy while giving you 100% full control of your home energy system.
- NATIVE HOME ASSISTANT & OPENCLAW AI: Experience seamless Native Home Assistant integration right out of the boxno firmware flashing or complex coding required. Featuring NEW OpenClaw Support, it enables AI-driven automation for smarter, real-time energy management and seamless smart home control.
- MAXIMIZE SOLAR & ZERO FEED-IN AUTOMATION: Designed for solar homes, the power monitor works with the Refoss app and Home Assistant to automatically use surplus solar power. Appliances like EV chargers, washing machines, and water heaters are powered during midday peaks, maximizing solar self-consumption and reducing low-value electricity feed-in to the grid. Optimizes usage and reduces bills.
- REAL-TIME MONITORING & 1% ACCURACY: Monitor voltage, current, active power, and power factor of major appliances. Provides 1% accuracy (200A: 2200A; 60A: 160A) and 2% at low current. Daily data stored up to 5 years and exportable. With no subscriptions or hidden fees, you get deep historical insights to help you identify every energy-saving opportunity and save 1020% on monthly bills.
- SMART ALERTS & CIRCUIT-LEVEL CONTROL: Set usage targets for each individual circuit and receive instant alerts when appliances exceed normal consumption. Refoss app supports automation and peak management to optimize schedules, reduce peaks, and improve efficiency. Real-time electricity usage monitor for circuit-level insights.
- ETL CERTIFIED & NON-INVASIVE INSTALLATION: ETL certified and compliant with UL 61010 safety standards for safe installation and operation. Supports 2 main circuit sensors (2200A each) and 16 branch sensors (160A each) with easy clamp-on installation. Fits most home circuit panels and includes a 2-year warranty with responsive support for reliable long-term monitoring.
Description
Yes. This home energy monitor supports 100% local control with Web UI, Open API, and MQTT. All energy data is stored locally without cloud, ensuring better privacy and reliability. Native Home Assistant integration. No flashing required. Zero feed-in means using solar power locally instead of exporting it. You can set automations with Refoss or Home Assistant to let appliances consume solar energy first. Standby power is electricity devices draw when "off" but still plugged in. A single 75W source costs ~$97/year. Most homes have 3–6. With Refoss EM16P, fix just two standby loads — and it pays for itself in under 2 months. Yes. Your HVAC has a predictable baseline power draw. As components age or fail, power consumption changes. Refoss detects unusual power consumption increases — which may indicate developing mechanical problems — before a costly breakdown occurs. The EM16P Smart Home Energy Monitor from Refoss, a sub-brand of meross, brings smart energy management to your home. It offers local control, real-time monitoring, and Home Assistant integration for full visibility. Smart solar zero feed-in redirects surplus power to appliances, maximizing self-consumption and cutting electricity costs. ETL certified for safe, reliable, and efficient energy management. See whole-home power in one clear system. Without this granularity, you are guessing. You might know your bill is high, but you won’t know that an aging garage refrigerator is drawing excessive power 24/7, or that a “vampire load” is adding $10 to your bill every month while devices are “off.” Supports JSON-RPC 2.0 via HTTP, Webhooks, MQTT for seamless data exchange and smart device control. Manage your devices from anywhere via browser without any app required. Monitor home energy use: 2x200A mains + 16x60A branches, track device use from AC to EV chargers. Track monthly energy use and cost by device. Find high-energy users and cut your bills. Monitor solar or wind output in real time. Track self-generated power and feed-in energy accurately. Set power limits for devices. Get instant alerts to spot unusual use and avoid extra costs. ETL certified, UL 61010 compliant, high-quality clamp-on CTs, built for long-term home use. The Refoss Smart Home Energy Monitor is built for the Total System Health enthusiast — someone who values privacy. Does the Refoss EM16P work without Home Assistant? Yes, it works standalone with its own app for real-time circuit data, history, and solar monitoring. Home Assistant integration is optional but adds automations, custom dashboards, long-term logging, and circuit-level triggers. Why is my electricity bill so high? Appliances like refrigerators, dryers, or EV chargers quietly use a lot of power. This smart power tracker monitors real-time usage per circuit, helping identify high-energy devices and reduce electricity costs by 10–20%. I don’t want my energy data sent to the cloud. Is it safe? Yes. All data stays local. Access and manage it via Web UI or local API—no cloud, full control, and easy integration for smart home or automation setups. Am I wasting solar energy? Excess solar power often goes unused. A solar power optimizer tracks solar production and automatically directs surplus energy to appliances such as heat pumps or dishwashers, boosting self-consumption and reducing electricity costs. How can I spot energy-hungry or faulty appliances? The fastest way to get an ROI is eliminating Vampire Loads — devices that draw power even when “off.” Refoss alerts you to unusual or peak consumption so you can fix them before they drive up costs.
Manufacturer: Refoss
Part Number: EM16P
Item Weight: 4.24 pounds
Product Dimensions: 4.5 x 3.5 x 1.1 inches
Item model number: EM16
Color: Orange+White
Item Package Quantity: 1
Included Components: Home Energy Monitor, WiFi Antenna Assembly, 200A Current Transformers x 2, 60A Current Transformers x 16, 3.5mm Insulation Plugs x 2, 2.5mm Insulation Plugs x 16, Wire Nuts x 3, Extra Wires x 3, Wire Harness, User Manual
Date First Available: October 31, 2024
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Sep 8
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- Zip Pay in 4
- Financing through Apple Pay
- Financing through Google Pay
Learn more about financing & leasing here.
Similar Products
Top Amazon Reviews
Color: Orange+White
I am extremely happy that I bought this Refoss Smart Energy Monitor EM16 to track the energy consumption in my home. I did a favor myself by watching a couple videos on youtube to make sure that this product meets all my needs and I can handle the installation comfortably and I HIGHLY RECOMMEND YOU DO THE SAME. Product is packed pretty well with all items you need (except screwdriver and some protective gear) and also comes with a user manual. User manual includes Installation guide with step-by-step instructions, Troubleshooting Guide, Technical specifications and Warranty. First, I have read the manual and all step-by-step instructions and then unboxed the rest of the items. I opened up my panel and took a picture and on a white paper I wrote down what breakers are connected to line A or to line B, that helped me to decide on connecting Lc to La as more breakers that I am planning to monitor are connected to line A. In your case, it may vary so make sure to look at the picture of your panel and plan accordingly to meet your energy monitoring needs. Refoss Smart Energy Monitor supports up to 16 channels and comes with 16 connectors excluding A1 and B1 (they go on to your service lines). I followed the instructions from the installation guide, and I felt it was pretty straight forward. Few of my breakers (A/C, Dryer and Range etc.) are 2 poles so I used both channels A and B and merged those channels (You may use one and change Circuit factor). Their app has a good feature where you can merge channels and label them (I have labeled them as A/C, Dryer etc.). Their app has a handful of settings that you can customize your setup based on your installation. To name some settings here, you can name each channel, merge channels, circuit factors (helps in case of using one circuit on multipole breakers), consumption alert etc. I don't have the Home Assistant set up so I can't say what functionality you get there. I wish they support other Smart home platforms, so it helps many users with their integrations (Smartthings etc.). About customer/technical support aspects, I had an opportunity to work with their support team as I noticed an issue, after the contact they asked me to share photos, and they suggested some changes to make sure that it is not an issue with the product. After completing the suggested changes, the issue still persisted and that helped them determine it was an issue with the monitor, and they sent a replacement and after installing the new one it worked flawless. Though their support is by email, they are pretty responsive and very helpful and knowledgeable. About the Product design aspects, it is well designed by keeping DIY installations in mind. Concept of using headphone-jack style and clamp style connectors is pretty easy to handle and helps with quick installation. After 4 weeks of monitoring, I can say that Refoss Smart Energy Monitor EM16 is pretty reliable to monitor energy consumption, and I highly recommend this product.
...
show more
Reviewed in the United States on October 19, 2025 by RV Sekhar
Color: Orange+White
This is a Home Assistant specific review. If you are using the app and on a typical network, only #1 would be of interest. Overall it works great! It was easy to setup and integrate into home assistant. However there are a few things I did notice about it: 1. It has 3 sets of 6 channels and a voltage measurement for each. It does not work will if you have a single unit and want to measure an even number of circuits between 2 phases. (and by work I mean exact measurements. It will still be close) However I had 2 units so I was able to split the circuits and it worked out. For this I have to give it 4 stars as it does not easily support a typical split phase configuration. 2. It requires using their app and making an account for the initial setup and connection to wifi. The app will error out if your phone is on a different vlan than the wifi you selected but it still connects. 3. The unit requires internet access at least 1 time before working locally. 4. The home assistant integration that is officially supported automatically scans for devices and if it is on a different subnet, it will not be found. This can be solved by using the integration from HACS and entering an IP address. Overall I am happy with the device and that I do not need to flash custom firmware but still run it on an internet restricted VLAN with Home Assistant!
...
show more
Reviewed in the United States on November 19, 2025 by Eric Johnson
Color: Orange+White
I installed an em16 pro in my home sub panel with the majority of my electric circuits. The install was fairly straight forward. I was able to get the connection to Home Assistant working with some difficulty. The integration for Refoss in the default repository is not correct for this version. After some back and forth with Refoss customer support I realized I needed to add the Refoss-Rpc integration. Once that was done on Home Assistant the Refoss device showed up immediately. The Refoss app is very basic and categorizes the panel input power as demand instead of supply from the grid. Customer supported told me this is an app bug and will be fixed in future firmware updates. Once I was connected to Home Assistant I was able to see clearly the power usage within the panel (both 120 & 240 circuits). Overall I'm very happy with the product and would purchase it again. In fact I have already bought a second unit for the main input panel on the side of the house. Looking forward to seeing dryer, hot water heater and garage usage. Customer support was very helpful and responses to my questions were overnight. This does require installation in your electrical panel. Please make sure you know what your doing and are careful. There's a ton of information on the net about how to do this. Mistakes though can be deadly...
...
show more
Reviewed in the United States on August 6, 2026 by B_Sisk
Color: Orange+White
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.
...
show more
Reviewed in the United States on September 8, 2025 by Surajmal Rathee
Color: Orange+White
I have 2 houses and I originally started with the Emporia Vue Gen 2 system (no longer available) in my first house so I was familiar with the installation process. It's basically identical for both systems. As others have mentioned, planning out your A and B phases and labeling will make the process go faster and smoother. The main difference in the installation between the Emporia and the Refoss is that the Vue does not make any reference to the A and B phases for the branch circuits but the Refoss does. Being that I only wanted a basic monitoring system for each circuit and for the entire house usage, I simply installed the sensors in order. Because I also have a standby generator, I needed a second unit for the generator subpanel. The components seem pretty much the same between both systems. Others mentioned that it was hard to get the sensors to snap closed, and while that is true at times, the Emporia system has the same issue. I imagine that the manufacturing process required to minimize the hinge tolerances so the snaps perfect align would make both products more expensive. Regardless, they do close, but sometimes it can get a little challenging as each additional sensor gives you a little less room for fingers. By the end the panel looks very busy for both systems. Others have noted that they installed the branch monitors in the proper direction but the readings were negative. I had that issue as well but luckily you simply have to change the multiplier to -1 in the app to correct it. The big difference in the products is the app. The Emporia app provides the data in a graph with live, minute, hour/day/week/month/year graphs. The data auto refreshes every second. The Refoss app gives you the live data, but the auto refresh is 5 seconds. It also gives day/week/month/year graphs but not hour. The Refoss app gives you more info on each circuit at a glance than Emporia, but that makes you have to scroll more to find the branches since fewer fit on the screen. It's a little less (no per hour) and slower (5 sec refresh vs 1 sec) info when you click on the branch circuit. Both apps have their pros and cons. Overall, I'm happy with the product. I had no problems with the installation and it does what I wanted it to do. Since it's new, I imagine Refoss has some updates and improvements pending for the app, but it's not bad as it is. It will give you some very detailed insight to what is using power and when and that can help you save money.
...
show more
Reviewed in the United States on October 19, 2025 by WMBG Chris
Color: Orange+White
Pros: - Build quality is on par with other competing products - Initial wifi setup is easy with no drama - Local LAN Home Assistant integration works decent Cons: - Manual makes references to "two phase" power, which is not a real thing. They should be saying "Split Phase". - Many configuration options are missing in the app, such as defining the sensor load as 120 or 240, which means after the fact you need to correct the load in watts based on your branch voltage (IE, double if it's 240) - Home Assistant integration does not allow any configuration or way to rename the sensors. - Sensor orientation is labeled BACKWARDS for Home Assistant - meaning, if you follow the manual, all sensors will report current draw as a negative number, and a positive value for backfeed (grid tie solar for example). This is the EXACT OPPOSITE logic employed with Home Assistant's energy metering. So if you follow the manual, Home Assistant will think each device is feeding back to the grid instead of drawing power. You'll either have to flip 18 current clamps to the opposite direction, or add inversion logic to each entity, which is annoying and messy. - Accuracy is a problem. There are 3 voltage sense wires, and the clamps are divided into 3 groups, A, B, and C. With single phase panels, this means you're measuring L1 + L2 and have to land the third wire on either leg. This means if you land the Group C sense wire on L2, if you use a Group C sensor on L1, you will get an incorrect voltage which is going to affect your measured load. A better way to do this is to be able to assign a sense wire - Current clamps are limited in size, and there's no option to buy larger clamps to accommodate large gauge wires for long runs.
...
show more
Reviewed in the United States on December 31, 2025 by jtrumpio
Color: Orange+White
This product fulfills its main promise, which is to be a Home Assistant-compatible energy monitor. It does that, and does it well. But some physical design choices stand in the way of a five-star review. It's just too hard to fit this product into a typical electrical panel. We have a Square D Homeline panel with 30 breaker slots, about 20 of which are populated. Here are the reasons why it won't fit: - The cables on the two main CTs are just barely long enough to reach from the top of the panel to the bottom. This severely restricts the position of the main orange box. - The box's power cable has a surprisingly thick and inflexible connector. This adds about two inches to the height of the box in an already cramped environment. - To fully use the product, you must add plugs along three of its sides. This effectively makes the box several inches taller and wider than the specifications state. I tried to work around these sizing challenges by adding a 1-inch flexible conduit and an external junction box for the EM16 to free up more space in the main panel. This was an exercise in frustration. I knew it would be difficult to get 19 cables (power, 2 main CTs, 16 branch CTs) through the conduit, but the 90-degree plugs on the CTs make it impossible. I'm now investigating thin audio extension cables as a workaround. Refoss should have used straight plugs, or else provided extension cables more suitable for those of who need to pull wires through conduit. The thick power connector is also completely unsuitable for pulling. Another poor design choice is to put the box's status LED on the opposite side of the port labels. You will almost certainly install the box with the labels facing toward you, which means that post-installation you won't be able to see the LED that tells you whether the box is working. I was able to install only the two main CTs and two branch CTs before reaching the limit of what would fit, so I have 14 unused channels. I could add a second conduit or replace the 1-inch conduit with a larger one, but I can spend only so much time on this project. I wish Refoss had designed for more installation scenarios by reducing the profile of the fully-loaded box, and by making it more compatible with installation through conduit.
...
show more
Reviewed in the United States on November 5, 2025 by Mike T
Color: Orange+White
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.
...
show more
Reviewed in the United States on November 6, 2025 by Dustin