The Sonoff POW Elite and Sonoff POWCT are both smart switches designed for power monitoring, both models are compatible with the eWeLink app, which allows for remote control and monitoring via a smartphone or tablet.
But they have some key differences:
This model supports inline installation, meaning it can be installed within a power line to monitor and control devices. It enables you to turn connected devices ON/OFF and supports a maximum of 21A / 5000W.
The Sonoff POWCT collects data on energy consumption without the need for electricity to pass through it directly. Supports up to 100A, providing you with expanded capability for monitoring power usage.