Refoss Smart Home Energy Monitor – Real-Time Usage, 18 Circuits, Local Data & Open API

Overview

The Refoss Smart Home Energy Monitor is designed to illuminate how electricity travels through your home. With professional-grade accuracy across 18 circuits, it delivers real-time usage data that helps you understand where energy is being consumed and where there may be opportunities to optimize efficiency.

Privacy comes first. This system stores data locally and provides flexible control options through a built-in Web UI, an Open API, MQTT, and WebSocket connections. Compatible with Home Assistant, it enables powerful automations without relying on cloud services or ongoing subscriptions, so you can manage your power with confidence.

Key capabilities

• Precise sensing across 18 circuits (2 main sensors up to 200A, 16 branch sensors up to 60A) with ±1% accuracy for a detailed energy map.
• Solar metering and optimization: direct surplus solar energy to mid-power appliances and optimize self-consumption to potentially lower grid feeds.
• Smart fault alerts that flag unusual energy usage, helping you spot developing inefficiencies before they escalate.
• Long-term analytics: 5-year data retention with daily history, exportable CSV data, and no required subscription.
• Local privacy architecture with a robust external antenna for stable Wi‑Fi, plus open APIs and MQTT for flexible integrations.
• Flexible electrical configurations: supports single-phase, split-phase, and 3‑phase four-wire setups; designed for straightforward installation and maintenance.
• User-friendly recovery: if a sensor is installed backward, flipping the reading in the app is a single tap—no rework or breaker access required.

Real-world use cases

Envision mornings where the heat pump and water heater come online, afternoons when solar generation peaks, and evenings when a mix of appliances runs. With Refoss, you can observe how each circuit contributes to daily energy totals, identify "energy vampires" like idle electronics or aging devices, and explore targets for smarter scheduling.

Coupled with Home Assistant or other automations, the system can help you choreograph energy flow in line with solar availability and utility rates. While individual results vary, users often discover patterns that support more intentional consumption and potentially lower electricity costs over time.

Why choose Refoss

• Privacy-first, local data storage with optional cloud-enabled capabilities through Open API and Web UI.
• Open ecosystem: easy integration with Home Assistant and other platforms for customized automations.
• Comprehensive historical data and export options to support audits, planning, and optimization efforts.
• Reliable hardware with ETL certification, a two-year warranty, and a design that accommodates future expansions.