--- product_id: 676503371 title: "Refoss Smart Home Energy Monitor, Native Open API & Web UI (No Cloud Required), Real Time Electricity Usage Monitor, Power Consumption Meter Works with Home Assistant & MQTT, Solar Net Metering, ETL" brand: "refoss" price: "NT$15787" currency: TWD in_stock: true reviews_count: 8 category: "Refoss" url: https://www.desertcart.tw/products/676503371-refoss-smart-home-energy-monitor-native-open-api-and-web store_origin: TW region: Taiwan --- # ±1% accuracy real-time monitoring Local control & privacy-first design Solar surplus auto-optimization Refoss Smart Home Energy Monitor, Native Open API & Web UI (No Cloud Required), Real Time Electricity Usage Monitor, Power Consumption Meter Works with Home Assistant & MQTT, Solar Net Metering, ETL **Brand:** refoss **Price:** NT$15787 **Availability:** ✅ In Stock ## Summary > ⚡ Empower your home with smart energy mastery—because every watt counts! ## Quick Answers - **What is this?** Refoss Smart Home Energy Monitor, Native Open API & Web UI (No Cloud Required), Real Time Electricity Usage Monitor, Power Consumption Meter Works with Home Assistant & MQTT, Solar Net Metering, ETL by refoss - **How much does it cost?** NT$15787 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/676503371-refoss-smart-home-energy-monitor-native-open-api-and-web) ## Best For - refoss enthusiasts ## Why This Product - Trusted refoss brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Solar-Powered Savings:** Automatically shift high-energy loads to peak solar production and slash your bills. - • **Plug & Play Installation:** Clamp-on sensors fit most panels with ETL certification and 2-year warranty for peace of mind. - • **Precision Energy Insights:** Track voltage, current, and power with ±1% accuracy for smarter decisions. - • **Smart Alerts & Automation:** Set custom thresholds and get instant notifications to optimize usage and prevent waste. - • **Privacy-First Local Control:** Access your data via Web UI and Open API without cloud dependency—your energy, your rules. ## Overview The Refoss EM16 Smart Home Energy Monitor delivers ultra-accurate, real-time tracking of your home's electricity usage with ±1% precision. Designed for privacy-conscious users, it offers local control through Web UI, Open API, and MQTT, eliminating cloud reliance. Perfect for solar homes, it intelligently maximizes solar self-consumption by automating high-energy appliances during peak production. ETL certified and easy to install with clamp-on sensors, it supports up to 2 main circuits and 16 branch circuits, providing detailed historical data and smart alerts to help you save 10–20% on electricity bills while maintaining full control and security. ## Description Smart Home Energy Monitor with Real-Time Accurate Energy Consumption Tracking, Supports Home Assistant, Electricity Usage Monitor with Local Control, Open API & Web UI, Solar Metering, ETL Certified - desertcart.com Review: 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 desertcart 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. Review: Awesome - 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! ## Features - ✨NEW✨ OpenClaw Support: Refoss devices now support OpenClaw AI-driven automation with Home Assistant for smarter, seamless control. - Local Control & Privacy: Access your home energy monitor locally via Web UI, Open API, and MQTT without relying on cloud services. Integrate with Home Assistant or other platforms. Local data access protects your privacy while giving you full control of your home energy system. - Maximize Solar Energy: Designed for solar homes, the EM16P 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 Energy Monitoring & Cost Insights: Monitor voltage, current, active power, and power factor of major appliances. Provides ±1% accuracy (200A: 2–200A; 60A: 1–60A) and ±2% at low current. Minute, hour, day, month, and year charts show real-time energy usage and electricity costs clearly. Daily data stored up to 5 years and exportable. Many users save 10–20% on electricity bills. - Smart Alerts & Energy Control: Set usage targets for each 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. - ETL Certified & Reliable Performance: ETL certified and compliant with UL 61010 safety standards for safe installation and operation. Supports 2 main circuit sensors (2–200A each) and 16 branch sensors (1–60A 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. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0DJNV3GPR | | Batteries Included? | No | | Batteries Required? | No | | Best Sellers Rank | #271,949 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #41 in Home Automation Modules | | Color | Orange+White | | Customer Reviews | 4.4 4.4 out of 5 stars (211) | | Date First Available | October 31, 2024 | | 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 | | Item Package Quantity | 1 | | Item Weight | 4.27 pounds | | Item model number | EM16 | | Manufacturer | Refoss | | Part Number | EM16 | | Product Dimensions | 4.5 x 3.48 x 1.1 inches | ## Images ![Refoss Smart Home Energy Monitor, Native Open API & Web UI (No Cloud Required), Real Time Electricity Usage Monitor, Power Consumption Meter Works with Home Assistant & MQTT, Solar Net Metering, ETL - Image 1](https://m.media-amazon.com/images/I/71BkferqpzL.jpg) ## Available Options This product comes in different **Color** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great Whole-Home Energy Monitor with Home Assistant Support! *by S***E on September 8, 2025* 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. ### ⭐⭐⭐⭐⭐ Awesome *by T***A on August 1, 2025* 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! ### ⭐⭐⭐⭐ Solid Hardware, Great for Home Assistant, App Just Needs Some Love *by R***N on October 14, 2025* 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. ## Frequently Bought Together - 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 - Upgraded Watt Power Meter Plug Home Electrical Usage Monitor Consumption, Energy Voltage Amps Kill Tester with Backlight, Overload Protection, 7 Modes Display --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tw/products/676503371-refoss-smart-home-energy-monitor-native-open-api-and-web](https://www.desertcart.tw/products/676503371-refoss-smart-home-energy-monitor-native-open-api-and-web) --- *Product available on Desertcart Taiwan* *Store origin: TW* *Last updated: 2026-04-24*