Sonoff SPM-Main energy monitoring controller, Wi-Fi and Ethernet
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Choose countrySonoff SPM-Main is the main controller in an energy monitoring and switching system used with SPM-4Relay modules. It supports monitoring electricity consumption in settings such as rented premises and offices, with control of up to 128 channels.
Connectivity and expansion
Connect to the cloud using wired Ethernet through the RJ45 port or 2.4 GHz Wi-Fi. SPM-4Relay modules communicate with the controller via RS-485.
- Expansion: one SPM-Main supports up to 32 SPM-4Relay modules.
- Channels: each SPM-4Relay provides up to 4 independent channels, with a maximum load of 20 A per channel. This load rating applies to the relay module.
- Protection: SPM-Main includes overload protection.
Consumption history and required accessories
The built-in microSD card reader allows consumption measurement history for the last 180 days to be saved and data to be exported. It supports 8–32 GB microSDHC cards. The microSD card and SPM-4Relay modules are not included.
| Manufacturer | Sonoff |
|---|---|
| Model | SPM-Main |
| Colour | White |
| Input power | 100–240 V ~, 50/60 Hz, 50 mA max. |
| Wi-Fi | 802.11 b/g/n, 2.4 GHz |
| Material | PC V0 |
| Dimensions | 142.5 × 90 × 66.5 mm |
| Compatible microSD cards | 8–32 GB (microSDHC) |
| Wired network connection | Ethernet, RJ45 port |
| Connection to SPM-4Relay | RS-485 |
| Number of connectable SPM-4Relay modules | Up to 32 |
| Total supported channels | Up to 128 |
| Channels per SPM-4Relay module | Up to 4 independent channels |
| Maximum load per SPM-4Relay channel | 20 A |
| Protection | Overload protection |
| Consumption history storage | Up to 180 days on a microSD card |
| EAN | 6920075776973 |
|---|
Are the SPM-4Relay module and microSD card included?
No. The SPM-4Relay module and microSD card are purchased separately. SPM-Main is the system's main controller and is used together with SPM-4Relay.
Is Wi-Fi required for cloud connectivity?
No. SPM-Main supports both 2.4 GHz Wi-Fi and wired Ethernet through an RJ45 port. RS-485 is used to connect the SPM-4Relay modules.
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