Description
Sonoff Stackable Smart Power Meter (SPM-Main)
The Sonoff SPM-Main device is the central control unit in Sonoff's Stackable Smart Power Meter (SPM) system, designed for advanced power monitoring and management across multiple circuits. It is particularly suitable for environments such as office buildings, shopping malls, server rooms, and industrial facilities.
🔧 Key Specifications
Model: SPM-Main
Power Supply: 100-240V AC, 50/60Hz
Network Connectivity: Wi-Fi (2.4GHz, IEEE 802.11 b/g/n) and Ethernet
Relay Connectivity: RS-485 (supports up to 32 SPM-4Relay units)
External Storage: MicroSD card (8GB - 32GB, SDHC) for local data storage
Dimensions: 142.5 × 90 × 66.5 mm
Mounting: DIN rail compatible
Operating Temperature: -10°C to +40°C
Material: Fire-retardant PC V0
⚙️ Features
Scalable Monitoring: Connect up to 32 SPM-4Relay units, each with 4 channels, allowing management of up to 128 circuits.
Real-time Data: Monitor voltage, current, and power consumption for each channel via the eWeLink app.
Overload Protection: Protects devices by cutting power when defined thresholds are exceeded.
Local Data Storage: Stores up to 180 days of power usage data on a MicroSD card, accessible via an HTTP API.
Remote Control: Remotely manage and monitor circuits through the eWeLink app on Android and iOS devices.
LAN Mode: Continued operation and control within the local network even if internet connection is lost.
Integration: Compatible with the eWeLink ecosystem; REST API support available.
📦 Box Contents
1x Sonoff SPM Main unit
1x 50cm RVVSP Cable
User Manual x 1
Note: SPM-4Relay units and MicroSD card sold separately.
🛠️ Installation and Setup
◆ Power Off: Ensure the main power supply is turned off before installation.
◆ Mounting: Install the SPM-Main unit on a DIN rail inside your electrical cabinet.
◆ Wiring: Connect the SPM-Main to SPM-4Relay units using RS-485 communication cables.
◆ Network Connection: Connect to your network via Wi-Fi or Ethernet.
◆ SD Card Installation (Optional): Insert a MicroSD card (8GB - 32GB) for local data storage.
◆ Power On: Restore power and use the eWeLink app to complete setup and configuration.
Ensure all wiring complies with local electrical regulations, and consider consulting a professional electrician for installation.
🔗 Resources
Official Product Page: Sonoff SPM-Main
User Manual: SPM-Main & SPM-4Relay Documentation
