Energy Monitors · Head to head

Refoss EM16P vs Shelly Pro 3EM-400

Full Smart Energy Monitors comparison in 2026

Updated October 2026
Data from Amazon and official Refoss and Shelly sites.
2026 verdict
Between Shelly Pro 3EM-400 and Refoss EM16P, Shelly Pro 3EM-400 is the better overall pick in 2026, leading on rating, warranty, and connectivity.
Shelly Pro 3EM-400
Winner
Shelly Pro 3EM-400
$329.99
Buy on Amazon USA
It has the clearer edge on rating, warranty, and connectivity, and it stays ahead on integrations and data & monitoring. Choose Refoss EM16P only if price matters more to you than the broader advantage from Shelly Pro 3EM-400. That is enough to make Shelly Pro 3EM-400 the better pick for most buyers.
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FeatureRefoss EM16PShelly Pro 3EM-400Winner
Price$169.99$329.99Refoss EM16P
Rating4.14.3Shelly Pro 3EM-400
Warranty2 years3 yearsShelly Pro 3EM-400
Connectivity2.4 GHz WiFi, Bluetooth2.4 GHz WiFi, Ethernet, Bluetooth, OtherShelly Pro 3EM-400
IntegrationsHome AssistantGoogle Home, Alexa, Samsung SmartThings, Home AssistantShelly Pro 3EM-400
Data & MonitoringEnergy Cost Tracking, Data Export, Usage AlertsEnergy Cost Tracking, Time-of-Use Rates, Data Export, Usage AlertsShelly Pro 3EM-400
MeteringSplit-Phase Support, Three-Phase Support, Solar Net Metering, Power Factor ReadingsThree-Phase Support, Solar Net Metering, Power Factor ReadingsTie
Breaker Panel InstallYESYESTie
Smart Meter PortNONOTie
Local ControlLocal API, MQTT, Local Web InterfaceLocal API, MQTT, Local Web InterfaceTie
Relay OutputNONOTie
Load ManagementYESYESTie

Frequently Asked Questions

Which is better overall: Refoss EM16P or Shelly Pro 3EM-400?

Shelly Pro 3EM-400 has the stronger overall profile in this comparison, especially for rating, warranty, and connectivity.

What is the biggest difference between Refoss EM16P and Shelly Pro 3EM-400?

Price is one of the clearest differences: Refoss EM16P lists $169.99, while Shelly Pro 3EM-400 lists $329.99.

Which one looks better on price?

Refoss EM16P is listed at $169.99, while Shelly Pro 3EM-400 is listed at $329.99. Refoss EM16P (better spec).

Who should buy Refoss EM16P?

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

Who should buy Shelly Pro 3EM-400?

Choose Shelly Pro 3EM-400 if your priority is rating and warranty and that matters more than price.

Full comparison table

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  • 25 Energy Monitors
  • 46 specs compared
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