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OpenEnergyMonitor emonPi3 6-Channel Energy Monitor vs Carlo Gavazzi EM530

Install fit
Phase support Single-phase and 3-phase 4-wire monitoring; 3-wire 3-phase is not supported by the reviewed shop configuration note. Two-phase and three-phase systems up to 415 V L-L.
Installation Wall-mounted CT energy monitor with integrated Raspberry Pi, emonVs voltage sensor / power input, and optional CT sensors selected for each circuit. DIN-rail energy analyzer for electrical-panel installation with external current sensors.
Measurement 6-channel CT AC energy monitor with local emonCMS logging for grid, solar, EV, battery, heat-pump, and circuit monitoring. 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 Unknown Class B MID active energy; Class 0.5S kWh family positioning.
Current sensing 6 CT sensor inputs; official shop options list 20 A, 50 A, 100 A, and 200 A voltage-output CT choices for CT1-CT6. External-sensor meter: CT 5 A, 333 mV sensor, or Rogowski-coil variants are documented.
Monitoring
Protocol Ethernet / Wi-Fi / MQTT / emonCMS / 433.92 MHz OpenEnergyMonitor radio Modbus RTU
Local API Yes Yes
Cloud dependency Local-first: emonPi3 runs emonCMS locally and can access data over MQTT; posting to remote servers such as Emoncms.org is optional. 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 Kingdom / EU through the official OpenEnergyMonitor shop; international availability depends on shipping, plug, voltage-sensor, and local installer suitability. Global Carlo Gavazzi and regional distributor channels; exact EM530 variants and approvals vary by country.
Source check
Last verified Jun 10, 2026 Jun 8, 2026
Product page Official page Official page
Documentation Official docs Official docs
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