Sonoff SPM Stackable Power Meter Main Unit - SPMMAIN

The Sonoff SPM Main Unit is the central controller for the SPM system, connecting to Wi-Fi and communicating with SPM 4Relay modules for smart control and power monitoring. It is designed for an electrical panel and works with the eWeLink app to view real-time and historical power usage for every channel. This stackable power meter controller supports one SPM Main Unit plus as many SPM 4Relay modules as needed, up to 32 units and 128 channels. It offers overload protection with safe power limits per channel, memory card support for saving consumption logs to an SD card sold separately, and DIN rail mounting for installation in your electrical panel. Key Features • Central controller for connected SPM 4Relay modules • Supports up to 32 SPM 4Relay modules • Monitors up to 128 channels • Real-time and historical power usage in the eWeLink app • Overload protection with safe power limits per channel • Memory card support for saving consumption logs to an SD card sold separately • DIN rail mounting • Connects to Wi-Fi and communicates with SPM 4Relay modules • Intended for electrical panel use • One SPM Main Unit is needed, with at least one SPM 4Relay for a complete setup • Each 4Relay covers 4 circuits Specifications • Brand: Sonoff • Model: SPM Main Unit • SKU: SPMMAIN • Color: White • Input: 100-240V~50/60Hz • Max power: 20A/Gang 80A/Total Max • Dimension: 142.5x90x66.5mm • Wireless connection: Wi-Fi 2.4 GHz • Working temperature: -10°C~40°C