Sonoff Smart Stackable Power Meter - Main Unit

Product detailed description

Sonoff Energy Meter - Main Unit

The Sonoff system is great thanks to its wide range of products. This energy meter stands out from the rest as it allows a LAN connection and subsequent connection of up to 32 units of 4-channel relays via RS-485. Such a system setup naturally ensures increased stability and high-quality communication.

The Smart Energy Meter acts as the main unit for communication, providing the ability to store consumption data on an SD card and connect high-power modules.

• Connect up to 32 pcs of SPM-4Relays - One SPM Main Unit can be connected to 32 SPM-4Relays. Each SPM-4Relay features 4 isolated channels to help you manage devices more conveniently.
• Energy Monitoring - You can track power consumption using the eWeLink app on your mobile phone. Easily view real-time current, voltage, and power.
• Max. 20A/Channel - Each channel can support a maximum current of 20A, without fear of high power loads.
• RS-485 Communication - SPM-Main communicates with SPM-4Relays via RS-485, enabling multi-terminal and stable long-distance data transmission.
• Overload Protection - Once overload protection is activated, it protects your devices from burning out.

The SONOFF Smart Stackable Power Meter system consists of:

• a main unit with a built-in Wi-Fi chip and support for the eWeLink IoT cloud and eWeLink app, and
• one or more SONOFF Smart Stackable 4-Relay Power Meters.

THIS PRODUCT IS THE MAIN UNIT. SPM 4-RELAY units are sold separately.

All units fit on an electrical cabinet DIN rail and provide smart control and power monitoring with a max power of 20A per channel group, as well as overload protection for all groups. It is a high-performance professional smart home tool for managing households, office buildings, industrial facilities, or shopping centers to monitor power consumption of residents or tenants.

The SPM Main Unit communicates with the eWeLink cloud via Ethernet or Wi-Fi and with SPM-4 relay modules via RS-485, enabling reliable and long-term data transmission. A single main unit can work with up to 32 pcs of 4-relay units, supporting overall management of up to 128 x 20A channels and energy metering.

The device features an SD card slot where you can insert an SDHC memory card (not included) to store up to 180 days of consumption data and check data via HTTP API. Data can also be exported.

Sonoff SPM Wiring Diagram:

Product Features:

Remote ON/OFF – Turn all your channels on and off remotely anytime, anywhere.
Connect up to 32 pcs of 4-channel relays for power metering on the main unit, supporting up to 128 independent channels in total
DIN rail mounting
SD Card Support: Supports adding an 8GB–32GB SDHC memory card to store up to 180 days of consumption data
Independent channel control
Physical ON/OFF buttons on 4-relay devices
Overload protection for all channels
Mobile App – Free mobile app for iOS and Android: eWeLink, connects to eWeLink IoT cloud
Sync Status – Check real-time relay status (ON or OFF) via the mobile app
Share Control – Control the device together with your family