---
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 | Smart Home Energy Monitor"
price: "145837 Ft"
currency: HUF
in_stock: true
reviews_count: 13
url: https://www.desertcart.hu/products/676503371-refoss-smart-home-energy-monitor-native-open-api-and-web
store_origin: HU
region: Hungary
---

# ±1% Accuracy Real-Time Monitoring Local Web UI & Open API - No Cloud Solar Net Metering & Automation 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

**Price:** 145837 Ft
**Availability:** ✅ In Stock

## Summary

> ⚡ Own Your Energy: Smarter, Safer, Solar-Optimized Monitoring

## 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 | Smart Home Energy Monitor
- **How much does it cost?** 145837 Ft with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hu](https://www.desertcart.hu/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

- • **Plug & Play Smart Home Integration:** Native Home Assistant & OpenClaw AI support means effortless setup and AI-driven energy automation out of the box.
- • **Maximize Solar Savings Automatically:** Smartly power your EV charger, washer, and water heater during solar peaks to slash bills and reduce grid feed-in.
- • **Total Local Control, Zero Cloud Risk:** Keep your energy data private and accessible anytime with built-in Web UI, Open API, and MQTT—no internet needed.
- • **Precision Energy Insights with ±1% Accuracy:** Track voltage, current, and power factor per circuit with deep historical data for up to 5 years—no subscriptions required.
- • **Safe, Non-Invasive Installation with ETL Certification:** Clamp-on sensors fit most panels easily, backed by UL safety standards and a 2-year warranty for peace of mind.

## Overview

The Refoss EM16 Smart Home Energy Monitor offers professional-grade, real-time electricity usage tracking with ±1% accuracy. It features local data access via a built-in Web UI and Open API, eliminating cloud dependency and enhancing privacy. Seamlessly integrates with Home Assistant and supports AI automation through OpenClaw. Designed for solar homes, it maximizes self-consumption by automating appliance usage during peak solar production. Installation is non-invasive with ETL certification, supporting up to 18 circuit sensors. The system stores up to 5 years of data, enabling detailed energy insights and cost savings without subscription fees.

## Description

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 - desertcart.com

Review: Great Whole-Home Energy Monitor with Home Assistant Support! - I’ve been using the Refoss Smart Energy Monitor for a week now, and I’m thoroughly impressed. One of the standout features is its local integration with Home Assistant, which is precisely why I chose this energy monitor. The instructions were straightforward, and the video on the desertcart listing was particularly helpful, guiding me through the entire installation process. It should be relatively easy for anyone with basic electrical knowledge and some handy skills. However, I recommend doing some pre-planning before installation to determine which circuits you want to monitor. There are five L1 circuit sensor, five L2 circuits sensor, and six circuits sensor that can be used on either L1 or L2. You’ll need to choose one or the other. Additionally, you can combine some circuits and use one clamp for them, as long as they don’t exceed the current limit of the circuit sensor. For instance, I combined two kitchen outlets into one, saving me a sensor I used for monitoring a different. For balanced 240V loads like an AC unit or an EV charger, you can use one clamp and then change the circuit factor to 2 in the Refoss app or create a helper in Home Assistant that multiplies the energy usage by 2. This is because with balanced loads, the energy drawn on both lines is the same, which is why it’s called a balanced load. This way, you can save a sensor to monitor another circuit. I highly recommend making a note of which sensors are connected to which circuits to avoid wasting time trying to remember where you connected them. Setting up the energy monitor on the app was a breeze. I simply downloaded the Refoss app, followed its instructions to connect it to Wi-Fi, and updated the software of the energy monitoring module. The Refoss app allows you to monitor live energy usage for each connected circuit and view a history of energy usage for each circuit, broken down by day, week, month, and year which is awesome for using the app on its own. Connecting to Home Assistant was equally easy. I searched for the Refoss add-on, and the energy monitor was automatically detected on my network. It brought over all the entities shown in the Refoss app and then I got to setting up everything in home assistant. Overall, I highly recommend this affordable and reliable whole-house energy monitoring system. If you use Home Assistant, this is one of the best options out there that is supported natively through the Refoss addon.
Review: Super Easy to Install, Excellent App, and Works Great with Home Assistant - I couldn’t be happier with the Refoss EM-16! I love having a smart home and I enjoy adding tech that makes our lives easier, is simple to use, and just makes sense. I shopped around for an energy monitoring system for a while and decided the Refoss EM16 was the way to go. This was the right choice! The installation was far simpler than I expected. The included headphone-jack style connectors made wiring a breeze — no tiny screws or fiddly clamps to deal with. I had read reviews that talked about the extra wire since these can’t be trimmed, but as you can see in the before and after photos of the breaker panel, the slack is easily manageable. Refoss labels all the clamps to make attaching clamps and connecting to the unit a breeze. I took my time to be cautious, and I was still able to hook everything up and have it running in two hours, without any special tools. The EM16’s connection to my WiFi is strong and it hasn’t dropped at all. Refoss gives you all you need to connect your power wires including the wire nuts and extra wire. I was extremely happy and slightly surprised to see how well the instructions are written and easy to follow; no missing words or “lost in translation” instances at all. To make your install fast and easy, plan out in advance what circuits you want to monitor. You can also use a single clamp across two wires (in the case of dual breaker circuits like A/C or hot water heater), allowing you to use more clamps to monitor more circuits. The app itself is outstanding. It guided me step-by-step through setup and immediately started giving me clear, real-time data. The interface is clean and intuitive, making it easy to see my usage at a glance and drill into details when I want to. You can set alerts and automations easily through the app. You can also plug in your price per kWh for power and the app will tell you what your current cost are (see pics). This even helped me to find I had two circuit breakers mislabeled and one isn’t even connected to anything! Our home is only 7 years old and that wasn’t found by two previous home inspections! Since I love home automation, integration with Home Assistant is important to me and the process with Refoss was seamless. Once connected, it showed up right away and has been rock-solid ever since. I can automate notifications, track energy trends, and even display the data on my dashboards with minimal extra effort. I even have automations to turn lights different colors when the clothes washer or dryer is done so we don’t forget to dry and fold them. Overall, the Refoss EM-16 is a fantastic product if you want reliable energy monitoring with minimal setup hassle and full smart-home integration. I only wish I had bought and installed this sooner! Highly recommended!

## 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 | Smart Home Energy Monitor - Image 1](https://m.media-amazon.com/images/I/71BkferqpzL.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

### ⭐⭐⭐⭐⭐ Great Whole-Home Energy Monitor with Home Assistant Support!
*by S***E on September 8, 2025*

I’ve been using the Refoss Smart Energy Monitor for a week now, and I’m thoroughly impressed. One of the standout features is its local integration with Home Assistant, which is precisely why I chose this energy monitor. The instructions were straightforward, and the video on the Amazon listing was particularly helpful, guiding me through the entire installation process. It should be relatively easy for anyone with basic electrical knowledge and some handy skills. However, I recommend doing some pre-planning before installation to determine which circuits you want to monitor. There are five L1 circuit sensor, five L2 circuits sensor, and six circuits sensor that can be used on either L1 or L2. You’ll need to choose one or the other. Additionally, you can combine some circuits and use one clamp for them, as long as they don’t exceed the current limit of the circuit sensor. For instance, I combined two kitchen outlets into one, saving me a sensor I used for monitoring a different. For balanced 240V loads like an AC unit or an EV charger, you can use one clamp and then change the circuit factor to 2 in the Refoss app or create a helper in Home Assistant that multiplies the energy usage by 2. This is because with balanced loads, the energy drawn on both lines is the same, which is why it’s called a balanced load. This way, you can save a sensor to monitor another circuit. I highly recommend making a note of which sensors are connected to which circuits to avoid wasting time trying to remember where you connected them. Setting up the energy monitor on the app was a breeze. I simply downloaded the Refoss app, followed its instructions to connect it to Wi-Fi, and updated the software of the energy monitoring module. The Refoss app allows you to monitor live energy usage for each connected circuit and view a history of energy usage for each circuit, broken down by day, week, month, and year which is awesome for using the app on its own. Connecting to Home Assistant was equally easy. I searched for the Refoss add-on, and the energy monitor was automatically detected on my network. It brought over all the entities shown in the Refoss app and then I got to setting up everything in home assistant. Overall, I highly recommend this affordable and reliable whole-house energy monitoring system. If you use Home Assistant, this is one of the best options out there that is supported natively through the Refoss addon.

### ⭐⭐⭐⭐⭐ Super Easy to Install, Excellent App, and Works Great with Home Assistant
*by K***. on September 19, 2025*

I couldn’t be happier with the Refoss EM-16! I love having a smart home and I enjoy adding tech that makes our lives easier, is simple to use, and just makes sense. I shopped around for an energy monitoring system for a while and decided the Refoss EM16 was the way to go. This was the right choice! The installation was far simpler than I expected. The included headphone-jack style connectors made wiring a breeze — no tiny screws or fiddly clamps to deal with. I had read reviews that talked about the extra wire since these can’t be trimmed, but as you can see in the before and after photos of the breaker panel, the slack is easily manageable. Refoss labels all the clamps to make attaching clamps and connecting to the unit a breeze. I took my time to be cautious, and I was still able to hook everything up and have it running in two hours, without any special tools. The EM16’s connection to my WiFi is strong and it hasn’t dropped at all. Refoss gives you all you need to connect your power wires including the wire nuts and extra wire. I was extremely happy and slightly surprised to see how well the instructions are written and easy to follow; no missing words or “lost in translation” instances at all. To make your install fast and easy, plan out in advance what circuits you want to monitor. You can also use a single clamp across two wires (in the case of dual breaker circuits like A/C or hot water heater), allowing you to use more clamps to monitor more circuits. The app itself is outstanding. It guided me step-by-step through setup and immediately started giving me clear, real-time data. The interface is clean and intuitive, making it easy to see my usage at a glance and drill into details when I want to. You can set alerts and automations easily through the app. You can also plug in your price per kWh for power and the app will tell you what your current cost are (see pics). This even helped me to find I had two circuit breakers mislabeled and one isn’t even connected to anything! Our home is only 7 years old and that wasn’t found by two previous home inspections! Since I love home automation, integration with Home Assistant is important to me and the process with Refoss was seamless. Once connected, it showed up right away and has been rock-solid ever since. I can automate notifications, track energy trends, and even display the data on my dashboards with minimal extra effort. I even have automations to turn lights different colors when the clothes washer or dryer is done so we don’t forget to dry and fold them. Overall, the Refoss EM-16 is a fantastic product if you want reliable energy monitoring with minimal setup hassle and full smart-home integration. I only wish I had bought and installed this sooner! Highly recommended!

### ⭐⭐⭐⭐ Sweet kit for monitoring house electronics.
*by I***N on July 20, 2025*

Have this product managing power usage in out house along with the Homeassistant management software. It took about 2 hours to plan out and install. While I was comfortable doing the work myself as an electrical engineer. I wouldn't recommend it for most DIY folks unless they are able to completely disconnect their main outside the house before the breaker box. Wifi connection worked great. VLAN automatically setup with no issues. Size was good for my breaker box, not sure if it would be as easy for an older or smaller box. Two issues I had, the install is a total mess of wires... it wasn't that easy to clean up. Wish there was a way to integrate current monitors into the breakers themselves. Second issue is the current readings were ALL backwards, despite following the directions to a T. Fortunately you can toggle this by adjusting your multiple from positive to negative in the app. Unfortunately thats annoying to do because of some android bugs making it hard to type "-" in their app? Look is ok if you don't mind the rats nest of orange wires in your breakerbox. Cost seems appropriate given the components included. Just wish they included another 5-10 breakouts to cover a full box, or at least the capacity to add them from an expansion kit. Kit should be durable and last for years with no major moving parts. Curious to see how well the plastic clips hold out over the years if I have to move it ever...

## 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

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*Product available on Desertcart Hungary*
*Store origin: HU*
*Last updated: 2026-07-05*