The key decision between these two SONOFF smart power meters comes down to how you monitor and where you install it. The LCD model puts real-time readings on the device itself and logs six months of usage history. The POWCT uses a split-core current transformer that can mount around a wire without direct contact with live conductors, and it works with Alexa and Google Home. Both connect over Wi-Fi, but they serve different installation styles and different ways of viewing your energy data. Your choice largely affects whether you check the meter on the device or through your phone.
Quick verdict If you want a self-contained unit with an onboard LCD and 20A max power monitoring, the SONOFF LCD Smart Power Meter Switch at USD 17.99 is the lower listed price of the pair. If you need higher current detection up to 100A and a split-core CT, the SONOFF POWCT at USD 34.99 is the more flexible choice. The price spread between the two is USD 17.00.
| Feature | SONOFF LCD Smart Power Meter Switch 20A Max | SONOFF POWCT Energy Monitor |
| Listed price | USD 17.99 | USD 34.99 |
| Price bar | | |
| Monitoring design | LCD screen with real-time power, voltage, and current | Split-core CT with up to 100A detection |
| Smart connectivity | Wi-Fi | Wi-Fi with eWelink, Alexa, Google Home |
| Usage history | 6-month history with hour-level accuracy and exportable data | Monitors room or appliance consumption from the panel |
Where each product wins The LCD model wins if you want readings at a glance, a lower price, and overload protection. The POWCT wins if you want a split-core CT for higher current monitoring and voice assistant support.
SONOFF LCD Smart Power Meter Switch 20A Max Power Monitoring Overload Protection
The onboard LCD makes this unit easy to check without opening an app. Real-time power, voltage, current, and cumulative energy appear directly on the device, and it also stores six months of usage history with hour-level accuracy and exportable data. That is useful if you want to track seasonal usage or keep a log outside the app. It is designed for loads up to 20A, so it is a good match for an individual appliance, heater, or light system rather than a whole-panel monitor. Overload protection is part of this model's design, which adds a safety layer for connected devices. The tradeoff is that the 20A max limit means it does not offer the 100A headroom of the POWCT, so it is not the choice for whole-home current monitoring.
SONOFF POWCT Smart Power Meter Switch Energy Monitor Work with Alexa/Google Home
The POWCT is built around a split-core current transformer rated up to 100A. That design lets you clamp around a wire and monitor consumption without physical contact with live wires. It also includes an SMA antenna interface and works with Alexa and Google Home through the eWelink app, so voice control is a clear advantage here. If you want to keep an eye on an entire room or heavy appliance from the electrical panel, this unit gives you the headroom to do that. The catch is that its 100A capacity is more than a single small device needs, so for a simple plug-level setup it may be more than you will use.
Final choice by use case Pick the SONOFF LCD Smart Power Meter Switch when you want an appliance-level meter with a screen and overload protection. Choose the SONOFF POWCT when you need a split-core CT for panel-level monitoring and want Alexa or Google Home integration.
