---
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"
price: "Rp9892518"
currency: IDR
in_stock: true
reviews_count: 13
url: https://www.desertcart.id/products/676503371-refoss-smart-home-energy-monitor-native-open-api-and-web
store_origin: ID
region: Indonesia
---

# ±1% accuracy real-time monitoring Local control & privacy-first design Solar surplus auto-optimization 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

**Price:** Rp9892518
**Availability:** ✅ In Stock

## Summary

> ⚡ Empower your home with smart energy mastery—because every watt counts!

## 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
- **How much does it cost?** Rp9892518 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.id](https://www.desertcart.id/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

- • **Solar-Powered Savings:** Automatically shift high-energy loads to peak solar production and slash your bills.
- • **Plug & Play Installation:** Clamp-on sensors fit most panels with ETL certification and 2-year warranty for peace of mind.
- • **Precision Energy Insights:** Track voltage, current, and power with ±1% accuracy for smarter decisions.
- • **Smart Alerts & Automation:** Set custom thresholds and get instant notifications to optimize usage and prevent waste.
- • **Privacy-First Local Control:** Access your data via Web UI and Open API without cloud dependency—your energy, your rules.

## Overview

The Refoss EM16 Smart Home Energy Monitor delivers ultra-accurate, real-time tracking of your home's electricity usage with ±1% precision. Designed for privacy-conscious users, it offers local control through Web UI, Open API, and MQTT, eliminating cloud reliance. Perfect for solar homes, it intelligently maximizes solar self-consumption by automating high-energy appliances during peak production. ETL certified and easy to install with clamp-on sensors, it supports up to 2 main circuits and 16 branch circuits, providing detailed historical data and smart alerts to help you save 10–20% on electricity bills while maintaining full control and security.

## Description

Does this home energy monitor work without internet or cloud services? Yes. This home energy monitor supports 100% local control with Web UI, Open API, and MQTT. All energy data is stored locally and works offline without cloud dependency, 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. Does this home energy monitor work without internet or cloud services? Yes. This home energy monitor supports 100% local control with Web UI, Open API, and MQTT. All energy data is stored locally and works offline without cloud dependency, 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. 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.

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: Great product! App needs a little work. - When I received this product, I was initially impressed by how solid it felt in my hand. It is heavy and feels extremely well-made. The provided instruction manual was intuitive and written in perfect English (based on experience, this is a HUGE plus). After cutting the main breaker that feeds my electrical panel, I was able to remove the panel cover and install the device in under an hour. I initially had a little trouble routing the wi-fi antenna, but finally decided to let it hang from the bottom of my box. In an installation with a surface-mounted panel, this would be much easier. My only issue with the installation was cosmetic. The wires running from the clamps to the device's brain use molded plugs and cannot be adjusted for length. It would be a neater installation if these cable lengths could be customized, but I consider this nitpicking, and it did not change my initial rating of the product. Since I had already installed the Refoss garage door controller at the house, I already had the application on my iPhone. Adding the power monitor was as easy as hitting the "+" in the app to add it to the dashboard. After a little configuration of my circuits, so that 240-volt breakers appeared as a single device, the installation was complete. The app was now showing me the power consumption of my monitored circuits in real-time. While the device works exactly as designed, and the installation went flawlessly, the app could provide me with clearer information. The real miss in the application is the inability to rename (or even add footnotes) to the circuits. If they could add this ability, it would make a huge difference. You should also be able to arrange the circuits in a custom order so that my mains could appear at the top of the app rather than being listed in alphabetical order. All in all, this is a great little device that will provide me with excellent insight into my power consumption at home, enabling me to make informed decisions about sizing a solar system in the future. It will also show me where I can reduce power usage when I need to look at installing an emergency generator.

## 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 - Image 1](https://m.media-amazon.com/images/I/71BkferqpzL.jpg)
![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 - Image 2](https://m.media-amazon.com/images/I/61ByKmF97yL.jpg)
![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 - Image 3](https://m.media-amazon.com/images/I/61N9f+9NmXL.jpg)
![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 - Image 4](https://m.media-amazon.com/images/I/61S0alPqj0L.jpg)
![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 - Image 5](https://m.media-amazon.com/images/I/71wNL4ccpdL.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.

### ⭐⭐⭐⭐⭐ Great product! App needs a little work.
*by E***. on September 29, 2025*

When I received this product, I was initially impressed by how solid it felt in my hand. It is heavy and feels extremely well-made. The provided instruction manual was intuitive and written in perfect English (based on experience, this is a HUGE plus). After cutting the main breaker that feeds my electrical panel, I was able to remove the panel cover and install the device in under an hour. I initially had a little trouble routing the wi-fi antenna, but finally decided to let it hang from the bottom of my box. In an installation with a surface-mounted panel, this would be much easier. My only issue with the installation was cosmetic. The wires running from the clamps to the device's brain use molded plugs and cannot be adjusted for length. It would be a neater installation if these cable lengths could be customized, but I consider this nitpicking, and it did not change my initial rating of the product. Since I had already installed the Refoss garage door controller at the house, I already had the application on my iPhone. Adding the power monitor was as easy as hitting the "+" in the app to add it to the dashboard. After a little configuration of my circuits, so that 240-volt breakers appeared as a single device, the installation was complete. The app was now showing me the power consumption of my monitored circuits in real-time. While the device works exactly as designed, and the installation went flawlessly, the app could provide me with clearer information. The real miss in the application is the inability to rename (or even add footnotes) to the circuits. If they could add this ability, it would make a huge difference. You should also be able to arrange the circuits in a custom order so that my mains could appear at the top of the app rather than being listed in alphabetical order. All in all, this is a great little device that will provide me with excellent insight into my power consumption at home, enabling me to make informed decisions about sizing a solar system in the future. It will also show me where I can reduce power usage when I need to look at installing an emergency generator.

### ⭐⭐⭐⭐ 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 Indonesia*
*Store origin: ID*
*Last updated: 2026-05-10*