SONOFF SPM-Main Smart Stackable Power Meter – Main Control Unit for SPM-4Relay, Wi-Fi & Ethernet, RS-485, MicroSD Data Storage, eWeLink App Compatible
Overview:
• The SONOFF SPM-Main Smart Stackable Power Meter is the main control unit of the SONOFF Smart Stackable Power Meter system, designed to manage and monitor multiple SPM-4Relay units.
• One SPM-Main can connect up to 32 × SPM-4Relay units, providing a scalable system for monitoring and managing up to 128 isolated electrical channels.
• It communicates with the connected relay modules through RS-485, while the main unit connects to the network through 2.4GHz Wi-Fi and supports Ethernet connection for stable network access.
• The system allows users to monitor voltage, current, power, and energy consumption, helping manage electrical loads in homes, offices, shops, shared spaces, and commercial installations.
• It supports MicroSD card storage, allowing long-term storage of power consumption data and operation logs for reporting and analysis.
Key Features:
• Main Control Unit for the SONOFF SPM Stackable Power Meter System.
• Supports up to 32 × SPM-4Relay units.
• Supports up to 128 isolated electrical channels when fully expanded.
• Wi-Fi + Ethernet Connectivity for flexible network connection.
• RS-485 Communication between SPM-Main and SPM-4Relay units.
• Remote Monitoring through eWeLink App.
• Power Consumption Monitoring for connected relay channels.
• Voltage, Current, Power & Energy Data Monitoring through connected SPM-4Relay modules.
• MicroSD Card Support for local data storage and export.
• LAN Control Support for local network operation.
• Overload Protection Management through the SPM system.
• DIN Rail Installation suitable for electrical panels and distribution boards.
• Scalable Power Metering Solution for homes, offices, shops, shared buildings, and commercial projects.
• Important Note: SPM-Main is the controller/main unit only; SPM-4Relay units are required for load control and channel-level power metering.
Technical Specifications:
• Model Name: SONOFF SPM-Main Smart Stackable Power Meter.
• Brand: SONOFF.
• Product Type: Smart Stackable Power Meter Main Unit.
• Model: SPM-Main.
• System Compatibility: SONOFF SPM-4Relay.
• Maximum Relay Units: Up to 32 × SPM-4Relay.
• Maximum Channels: Up to 128 Isolated Channels.
• Communication with Relay Units: RS-485.
• Network Connectivity: Wi-Fi + Ethernet.
• Wi-Fi Standard: IEEE 802.11 b/g/n 2.4GHz.
• Control App: eWeLink App.
• Input Rating: 100–240V AC, 50/60Hz, 50mA Max.
• MicroSD Card Support: 8GB–32GB.
• Data Storage: Power Consumption Data / Operation Logs.
• LAN Control: Supported.
• Material: PC V0 Flame-Retardant Material.
• Dimensions: 142.5 × 90 × 66.5 mm.
• Working Temperature: -10°C to 40°C.
• App Supported Systems: Android & iOS.
• Installation Type: DIN Rail / Electrical Panel Installation.
• Application: Indoor Electrical Monitoring System.
Applications:
• Electrical distribution board monitoring.
• Multi-channel power consumption management.
• Commercial building energy monitoring.
• Shared electricity consumption tracking.
• Offices and shops.
• Villas and apartments.
• Server rooms and equipment rooms.
• Smart electrical panel projects.
• Energy-saving and power management systems.
• Large-scale eWeLink smart power monitoring projects.
Connect Gates Recommendation:
• Recommended by Connect Gates for projects that require a scalable multi-channel energy monitoring system, centralized control through SPM-Main, and expandable electrical monitoring using up to 32 SPM-4Relay units for professional distribution board and commercial power management.