Sonoff SPM-Main Wifi Smart Stackable Power Meter

Take complete control of electrical monitoring and energy efficiency with the Sonoff SPM-Main Wifi Smart Stackable Power Meter. Acting as the core communicator for Sonoff's modular power management ecosystem, this intelligent gateway enables centralized control and granular power analysis across residential, commercial, and multi-tenant properties.

Scalable Multi-Channel Management

The SPM-Main can interface with up to 32 SPM-4Relay modules using a reliable RS-485 daisy-chain bus. With each 4-relay unit offering 4 isolated outputs, a single SPM-Main can effortlessly coordinate up to 128 individual electrical circuits, making it exceptionally scalable for apartment complexes, server rooms, and retail environments.

Real-Time Energy Monitoring & Local Logging

Monitor real-time energy parameters including voltage, current, and active power consumption from any location using the eWeLink mobile application. In addition to cloud connectivity, the SPM-Main features an onboard micro SD card slot supporting historical energy data logs for up to 180 days, preventing data loss even during network outages.

Dual-Band Network Connectivity

Connect seamlessly to your local network via 2.4GHz Wi-Fi or directly through an integrated RJ45 Ethernet port for mission-critical stability and reduced latency in dense electrical panels.

Note: The SPM-Main unit does not provide direct power relay outputs and must be paired with at least one SPM-4Relay module to perform switching and power measurement functions.

Key Features

• Centralized Gateway: Coordinates up to 32 SPM-4Relay units (up to 128 channels).
• Comprehensive Power Metering: Tracks live voltage, current, and active wattage.
• Flexible Networking: Dual connectivity via 2.4GHz Wi-Fi and RJ45 Ethernet.
• Local Data Storage: Micro SD card slot for local historical power consumption logging.
• Standard DIN-Rail Mounting: Built for clean, standardized installation in breaker panels.