Energy Monitors · Head to head

Refoss EM16P vs Shelly EM Gen4

Full Smart Energy Monitors comparison in 2026

Updated September 2026
Data from Amazon and official Refoss and Shelly sites.
2026 verdict
For most buyers in 2026, Shelly EM Gen4 is the safer pick over Refoss EM16P because of rating, warranty, and connectivity.
Shelly EM Gen4
Winner
Shelly EM Gen4
Buy on Amazon UKCheck price
It separates itself most clearly on rating, warranty, and connectivity, while still looking better on integrations and data & monitoring. The only strong reason to choose Refoss EM16P is if metering is more important to you than the overall verdict. That keeps the verdict firmly in favor of Shelly EM Gen4.
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FeatureRefoss EM16PShelly EM Gen4Winner
Rating4.24.6Shelly EM Gen4
Warranty2 years3 yearsShelly EM Gen4
MeteringSplit-Phase Support, Three-Phase Support, Solar Net Metering, Power Factor ReadingsSolar Net Metering, Power Factor ReadingsRefoss EM16P
Connectivity2.4 GHz WiFi, Bluetooth2.4 GHz WiFi, Bluetooth, ZigbeeShelly EM Gen4
IntegrationsHome AssistantGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterShelly EM Gen4
Data & MonitoringEnergy Cost Tracking, Data Export, Usage AlertsEnergy Cost Tracking, Time-of-Use Rates, Data Export, Usage AlertsShelly EM Gen4
Relay OutputNOYESShelly EM Gen4
Breaker Panel InstallYESYESTie
Smart Meter PortNONOTie
Local ControlLocal API, MQTT, Local Web InterfaceLocal API, MQTT, Local Web InterfaceTie
Load ManagementYESYESTie
Winner
Shelly

Shelly EM Gen4

Price unavailable right now
Buy on Amazon UKCheck price
  • + Rating: 4.6
  • + Warranty: 3 years
  • + Connectivity: 2.4 GHz WiFi, Bluetooth, Zigbee
  • - Metering: Solar Net Metering, Power Factor Readings vs Split-Phase Support, Three-Phase Support, Solar Net Metering, Power Factor Readings

Frequently Asked Questions

Which is better overall: Refoss EM16P or Shelly EM Gen4?

Shelly EM Gen4 has the stronger overall profile in this comparison, especially for rating, warranty, and connectivity.

What is the biggest difference between Refoss EM16P and Shelly EM Gen4?

Rating is one of the clearest differences: Refoss EM16P lists 4.2, while Shelly EM Gen4 lists 4.6.

Who should buy Refoss EM16P?

Choose Refoss EM16P if your priority is metering and that matters more than rating.

Who should buy Shelly EM Gen4?

Choose Shelly EM Gen4 if your priority is rating and warranty and that matters more than metering.

Full comparison table

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  • 23 Energy Monitors
  • 46 specs compared
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