--- 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" price: "€ 445.96" currency: EUR in_stock: true reviews_count: 13 url: https://www.desertcart.sk/products/676503371-refoss-smart-home-energy-monitor-native-open-api-and-web store_origin: SK region: Slovakia --- # ±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 **Price:** € 445.96 **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 - **How much does it cost?** € 445.96 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/676503371-refoss-smart-home-energy-monitor-native-open-api-and-web) ## Best For - Customers looking for quality international products ## Why This Product - 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 Does this home energy monitor work without internet or cloud services? Yes. This home energy monitor supports 100% local control with Web UI, Open API, and MQTT. All energy data is stored locally and works offline without cloud dependency, ensuring better privacy and reliability. Is it compatible with Home Assistant natively? Do I need to flash firmware? Native Home Assistant integration. No flashing required. What is Zero feed-in? 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. Does this home energy monitor work without internet or cloud services? Yes. This home energy monitor supports 100% local control with Web UI, Open API, and MQTT. All energy data is stored locally and works offline without cloud dependency, ensuring better privacy and reliability. Is it compatible with Home Assistant natively? Do I need to flash firmware? Native Home Assistant integration. No flashing required. What is Zero feed-in? 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. What is standby power and how much does it cost? 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. Can a home energy monitor detect HVAC problems? 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. What is standby power and how much does it cost? 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. Can a home energy monitor detect HVAC problems? 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. ## Features - 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 even during internet outages. - NATIVE HOME ASSISTANT & OPENCLAW AI: Experience seamless Native Home Assistant integration right out of the box—no 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: 2–200A; 60A: 1–60A) 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 10–20% 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 (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) ![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 2](https://m.media-amazon.com/images/I/61ByKmF97yL.jpg) ![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 3](https://m.media-amazon.com/images/I/61N9f+9NmXL.jpg) ![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 4](https://m.media-amazon.com/images/I/61S0alPqj0L.jpg) ![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 5](https://m.media-amazon.com/images/I/71wNL4ccpdL.jpg) ## Available Options This product comes in different **Color** options. ## Questions & Answers **Q: Does the Refoss EM16P work without Home Assistant?** A: 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. **Q: Why is my electricity bill so high?** A: 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%. **Q: I don’t want my energy data sent to the cloud. Is it safe?** A: 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. **Q: Am I wasting solar energy?** A: 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. **Q: How can I spot energy-hungry or faulty appliances?** A: 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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by S***E on September 8, 2025* ### ⭐⭐⭐⭐⭐ Review *by E***. on September 29, 2025* ### ⭐⭐⭐⭐ Review *by I***N on July 20, 2025* ## 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.sk/products/676503371-refoss-smart-home-energy-monitor-native-open-api-and-web](https://www.desertcart.sk/products/676503371-refoss-smart-home-energy-monitor-native-open-api-and-web) --- *Product available on Desertcart Slovakia* *Store origin: SK* *Last updated: 2026-05-04*