Energy Monitors · Head to head

Shelly 3EM-63W Gen3 vs SONOFF POWCT

Full Smart Energy Monitors comparison in 2026

Updated September 2026
Data from Amazon and official Shelly and Sonoff sites.
2026 verdict
Across the 2026 comparison, Shelly 3EM-63W Gen3 earns the nod over SONOFF POWCT on the strength of rating, warranty, and metering.
Shelly 3EM-63W Gen3
Winner
Shelly 3EM-63W Gen3
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It has the clearer edge on rating, warranty, and metering, and it stays ahead on connectivity and data & monitoring. SONOFF POWCT is the better fit only for buyers who prioritize integrations and relay output above everything else here. Overall, Shelly 3EM-63W Gen3 makes more sense for most people.
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FeatureShelly 3EM-63W Gen3SONOFF POWCTWinner
Rating4.64.5Shelly 3EM-63W Gen3
Warranty3 years1 yearShelly 3EM-63W Gen3
MeteringThree-Phase Support, Solar Net Metering, Power Factor ReadingsSolar Net MeteringShelly 3EM-63W Gen3
Connectivity2.4 GHz WiFi, Bluetooth2.4 GHz WiFiShelly 3EM-63W Gen3
IntegrationsGoogle Home, Alexa, Samsung SmartThings, Home AssistantGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterSONOFF POWCT
Data & MonitoringEnergy Cost Tracking, Time-of-Use Rates, Data Export, Usage AlertsData Export, Usage AlertsShelly 3EM-63W Gen3
Local ControlLocal API, MQTT, Local Web InterfaceNoneShelly 3EM-63W Gen3
Relay OutputNOYESSONOFF POWCT
Breaker Panel InstallYESYESTie
Smart Meter PortNONOTie
Load ManagementYESYESTie
Winner
Shelly

Shelly 3EM-63W Gen3

Price unavailable right now
Buy on Amazon UKCheck price
  • + Rating: 4.6
  • + Warranty: 3 years
  • + Metering: Three-Phase Support, Solar Net Metering, Power Factor Readings
  • - Integrations: Google Home, Alexa, Samsung SmartThings, Home Assistant vs Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter
  • - Relay Output: NO vs YES

Frequently Asked Questions

Which is better overall: Shelly 3EM-63W Gen3 or SONOFF POWCT?

Shelly 3EM-63W Gen3 has the stronger overall profile in this comparison, especially for rating, warranty, and metering.

What is the biggest difference between Shelly 3EM-63W Gen3 and SONOFF POWCT?

Rating is one of the clearest differences: Shelly 3EM-63W Gen3 lists 4.6, while SONOFF POWCT lists 4.5.

Who should buy Shelly 3EM-63W Gen3?

Choose Shelly 3EM-63W Gen3 if your priority is rating and warranty and that matters more than integrations.

Who should buy SONOFF POWCT?

Choose SONOFF POWCT if your priority is integrations and relay output and that matters more than rating.

Full comparison table

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  • 46 specs compared
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