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Refoss Open API Smart Energy Monitor EM16P vs Carlo Gavazzi EM530

Energy Meter

Refoss Open API Smart Energy Monitor EM16P

Refoss EM16P

Energy Meter

Carlo Gavazzi EM530

Decision point	Refoss Open API Smart Energy Monitor EM16P	Carlo Gavazzi EM530

Install fit
Phase support	Single-phase 2-wire, split-phase 3-wire, and 3-phase 4-wire Wye systems with grounded neutral; not for Delta systems.	Two-phase and three-phase systems up to 415 V L-L.
Installation	Indoor electrical-panel CT installation with clamp-on main and branch-circuit sensors.	DIN-rail energy analyzer for electrical-panel installation with external current sensors.
Measurement	CT-based whole-home and circuit-level energy monitor with consumption, feed-in, voltage, current, power, power factor, and energy statistics.	Two- and three-phase energy analyzer for consumption and generation/import-export measurement.
Max current	200 A	10000 A
Nominal voltage	Unknown	120-240 V L-N / 208-415 V L-L
Meter fit
Accuracy class	+/-2% measurement accuracy	Class B MID active energy; Class 0.5S kWh family positioning.
Current sensing	2 main CT sensors up to 200 A each plus 16 branch-circuit CT sensors up to 60 A each.	External-sensor meter: CT 5 A, 333 mV sensor, or Rogowski-coil variants are documented.
Monitoring
Protocol	Wi-Fi / local Web UI / Refoss Open API / MQTT / Home Assistant	Modbus RTU
Local API	Yes	Yes
Cloud dependency	Can operate offline with local Web access, Refoss Open API, and MQTT; Refoss app/cloud storage is optional for remote app charts and long-term history.	No vendor cloud is required for core metering. EM530 exposes local wired data through RS485 Modbus RTU or M-Bus variants.
Home Assistant	Yes	Yes
Solar fit
Solar import/export	Yes	Yes
Buying context
Price range	Unknown	About $250-$500
Availability	United States and Canada through Refoss official online store; broader availability depends on regional store and reseller channels.	Global Carlo Gavazzi and regional distributor channels; exact EM530 variants and approvals vary by country.
Source check
Last verified	Jun 8, 2026	Jun 13, 2026
Product page	Official page	Official page
Documentation	Official docs	Official docs