Refoss Smart Home Energy Monitor with Open API, Home Assistant, No Cloud

Price: $199.99 - $179.99
(as of Sep 11, 2026 13:00:35 UTC – Details)

From the brand

Does this home energy monitor work without cloud services?

Yes. This home energy monitor supports 100% local control with Web UI, Open API, and MQTT. All energy data is stored locally without cloud, 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.

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.

EM16P MODEL & 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.
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.
Customers find the energy monitor to be a great product that works well with Home Assistant on VLAN and offers simple, straightforward installation. They appreciate its value, noting that savings can cover the cost in under five months, and like its connectivity features, with one customer mentioning it can function as a wireless access point. The app functionality receives mixed feedback, with customers describing it as basic and sub-par, while accuracy is also mixed, with some finding it very accurate while others report issues.