Sonoff SPM-Main Smart Modular Power Meter

The Sonoff SPM-Main smart power meter is the central component of a modular system designed for comprehensive power consumption measurement. It functions as a smart switch, allowing you to monitor electricity usage in various settings, such as apartments or offices. The device supports both wired (RJ45 Ethernet port) and wireless Wi-Fi connectivity to the cloud. This versatile system can support up to 128 channels by connecting to a maximum of 32 SPM-4Relay switches, each offering four independent channels with a maximum load of 20 A. The connection between the SPM-Main and SPM-4Relay switches is established via an RS-485 port, ensuring stable long-distance transmission. The SPM-Main is equipped with overload protection to prevent damage to connected devices, making it suitable for protecting expensive equipment, such as in server rooms. For data security and convenience, a built-in microSD card reader (compatible with 8-32 GB microSDHC cards) allows saving up to 180 days of energy consumption history, with easy data export capabilities. Please note that the microSD card and SPM-4Relay switches are not included and must be purchased separately. Specifications: * Manufacturer: Sonoff * Model: SPM-Main * Color: White * Input: 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 x 90 x 66.5 mm * Compatible microSD cards: 8-32 GB (microSDHC)