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
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. See more product details
Pros
- Fully local operation with no cloud dependency — data stays on your LAN and requires no subscription fees
- Native Open API and built-in Web UI enable deep integration and custom dashboards without third-party services
- First-class Home Assistant and MQTT support makes it a natural fit for serious DIY smart home ecosystems
- Solar net metering capability allows simultaneous monitoring of grid consumption and solar export from a single device
- ETL certification provides verified electrical safety compliance, important for a device installed near a breaker panel
- Real-time whole-home power monitoring delivers actionable energy data that individual smart plugs cannot replicate at scale
Cons
- Installation requires working inside an electrical panel to attach CT clamps, which is intimidating and potentially unsafe for non-technical users
- Web UI and API are functional but lack the polish of cloud-based consumer energy monitors like Sense or Emporia Vue
- At $199.99, the price is substantial for a relatively obscure brand with only 209 reviews and an uncertain long-term firmware support track record
- No mainstream smart home ecosystem compatibility (e.g., Apple Home, Google Home, Alexa) limits appeal to users outside the Home Assistant/MQTT niche
Who Is It For?
This monitor is purpose-built for technically confident homeowners who run Home Assistant or other self-hosted smart home platforms and want whole-home energy visibility without cloud dependency. It's especially compelling for households with solar panel installations needing net metering data. Users who want a simple plug-and-play energy app experience should look elsewhere.
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