Energy Monitors · Head to head

Refoss EM16P vs Shelly Pro 3EM-400

Full Smart Energy Monitors comparison in 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 warranty, connectivity, and integrations. It has the clearer edge on warranty, connectivity, and integrations, and it stays ahead on data & monitoring. Choose Refoss EM16P only if price, rating, and metering matter 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.
vs
FeatureRefoss EM16PShelly Pro 3EM-400Winner
Price$179.99$329.99Refoss EM16P
Rating4.34.2Refoss EM16P
Warranty2 years3 yearsShelly Pro 3EM-400
MeteringSplit-Phase Support, Three-Phase Support, Solar Net Metering, Power Factor ReadingsThree-Phase Support, Solar Net Metering, Power Factor ReadingsRefoss EM16P
Connectivity2.4 GHz WiFi, Bluetooth2.4 GHz WiFi, Ethernet, Bluetooth, OtherShelly Pro 3EM-400
IntegrationsHome AssistantGoogle Home, Alexa, 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
Breaker Panel InstallYESYESTie
Smart Meter PortNONOTie
Local ControlLocal API, MQTT, Local Web InterfaceLocal API, MQTT, Local Web InterfaceTie
Relay OutputNONOTie
Load ManagementYESYESTie
Winner
Shelly

Shelly Pro 3EM-400

$329.99
Buy on Amazon USA
  • + Warranty: 3 years
  • + Connectivity: 2.4 GHz WiFi, Ethernet, Bluetooth, Other
  • + Integrations: Google Home, Alexa, Home Assistant
  • - Price: $329.99 vs $179.99
  • - Rating: 4.2 vs 4.3

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 warranty, connectivity, and integrations.

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

Price is one of the clearest differences: Refoss EM16P lists $179.99, while Shelly Pro 3EM-400 lists $329.99.

Which one looks better on price?

Refoss EM16P is listed at $179.99, 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 rating and that matters more than warranty.

Who should buy Shelly Pro 3EM-400?

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

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