Refoss Home Energy Monitor with 16-Circuit Sensors
A whole-home energy monitor that lives entirely on your local network — no cloud account, no subscription, no data leaving your house.
For anyone running Home Assistant or just deeply uncomfortable with smart-home data heading to a company's servers, this is a genuinely compelling option: local Web UI, open API, and native MQTT support out of the box.
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Our verdict
For anyone running Home Assistant or just deeply uncomfortable with smart-home data heading to a company's servers, this is a genuinely compelling option: local Web UI, open API, and native MQTT support out of the box. The solar net-metering and zero feed-in automation features make it particularly useful if you have panels and want to shift load automatically to midday surplus. That said, 16 branch circuits and a 200A main take real electrical panel work to install, so it's less suited for renters, anyone unfamiliar with their breaker box, or people who just want a plug-and-play overview without digging into Home Assistant automations.
Best for: Home Assistant users, solar households, and privacy-minded homeowners who want circuit-level data without a cloud subscription
Trend check
SteadyInterest is holding steady.
- Google searches
- down 12% over the last 4 weeksSearches for “home energy monitor”
- TikTok
- 7+ videos this month · 6 this weeknone labeled as paid partnerships
- 12 discussions this month across 10 communitiesWhat people say: mixedThe few users who discuss the Refoss EM16 report it works, but they also describe fiddly clamp installation and extra setup work when running more than one unit in Home Assistant.Top thread in r/unitedkingdom ↗
- YouTube reviews
- 7 independent channels in the last year
Measured Nov 2 from Google Trends, TikTok, Reddit, YouTube. How we measure
What we like
- Fully local control via built-in Web UI, open API, and MQTT — no internet required
- Native Home Assistant integration with no firmware flashing
- Monitors up to 16 branch circuits plus 2 mains (200A each)
- ±1% accuracy with up to five years of exportable historical data
- ETL certified, no ongoing subscription fees
Product details
- 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.
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