Description
The SONOFF SPM-MAIN is a professional smart power monitoring hub designed as the central control unit for the SONOFF Stackable Power Meter System. Built for advanced energy management and multi-circuit monitoring, the SPM-MAIN works together with SONOFF SPM-4RELAY modules to provide centralized control, power monitoring, overload protection, and energy statistics for residential, commercial, and industrial applications.
One SPM-MAIN unit can connect with up to 32 SPM-4RELAY modules through RS-485 communication, allowing management of up to 128 independent channels. The system is ideal for apartment buildings, offices, shopping centers, server rooms, factories, rental properties, and large-scale electrical monitoring projects.
The SPM-MAIN supports both Wi-Fi and Ethernet connectivity for stable communication and remote management through the eWeLink app. It also includes local data storage support through a MicroSD card slot for historical power consumption records and local monitoring.
Its DIN rail design enables clean and professional installation inside electrical cabinets and power distribution systems.
Technical Specifications
| Specification |
Details |
| Product Model |
SONOFF SPM-MAIN |
| Product Type |
Smart Power Monitoring Hub |
| Function |
Central Unit for SPM System |
| Compatible Devices |
SONOFF SPM-4RELAY |
| Maximum Expansion |
Up to 32 SPM-4RELAY Units |
| Maximum Supported Channels |
128 Channels |
| Communication with Relays |
RS-485 |
| Connectivity |
Wi-Fi 2.4GHz & Ethernet |
| App Support |
eWeLink App |
| Local Data Storage |
MicroSD Card Supported |
| LAN Control |
Supported |
| Remote Monitoring |
Supported |
| DIN Rail Mounting |
Supported |
| Input Voltage |
100-240V AC 50/60Hz |
| Material |
PC V0 |
| Operating Temperature |
-10°C to 40°C |
| Dimensions |
142.5 × 90 × 66.5 mm |
| Color |
White |
Why Choose This Product
- Centralized smart energy monitoring system
- Supports up to 128 independent monitoring channels
- Works with SONOFF SPM-4RELAY modules
- Stable RS-485 communication for long-distance transmission
- Wi-Fi and Ethernet connectivity for reliable control
- Supports local MicroSD power consumption storage
- Professional DIN rail installation design
- Ideal for buildings, offices, factories, and rental properties
- Real-time monitoring through the eWeLink app
- Advanced overload protection and energy management system
