Refoss
Refoss Smart Home Energy Monitor
Bottom line: The Refoss Smart Home Energy Monitor: 100% local control via Web UI, Open API, MQTT—no cloud, works during internet outages; main trade-off: circuit-level automation depends on the Refoss app or Home Assistant.
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Pros & Cons
Pros
- ✓ 100% local control via Web UI, Open API, MQTT—no cloud, works during internet outages
- ✓ Native Home Assistant + new OpenClaw AI support, no firmware flashing needed
- ✓ ±1% accuracy monitoring voltage, current, active power, power factor
- ✓ Solar zero feed-in automation maximizes surplus self-consumption
- ✓ ETL certified to UL 61010; 2 main (2-200A) + 16 branch (1-60A) sensors
Cons
- ✗ Circuit-level automation depends on the Refoss app or Home Assistant
- ✗ 16-branch clamp setup can crowd tighter breaker panels
- ✗ ±2% accuracy at low current, less precise than the ±1% headline
- ✗ 2-year warranty shorter than some competing monitors
SpecPicks Verdict
SpecPicks scored Refoss Smart Home Energy Monitor using a rating × review-volume × price-fit model applied to published specs and reviews across the accessories category. Refoss's accessories lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for accessories of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Key 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.
Full Specifications
| Brand | Refoss |
|---|---|
| Color | Orange+White |
| Part Number | EM16 |
| Item Package Quantity | 1 |
| Full listing 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 | Smart Home Energy Monitor |
Ready to buy?
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 | Smart Home Energy Monitor is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
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