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OpenEnergyMonitor emonPi3 6-Channel Energy Monitor vs Carlo Gavazzi EM340

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. Three phase
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 mounted direct-connected energy analyzer
Measurement 6-channel CT AC energy monitor with local emonCMS logging for grid, solar, EV, battery, heat-pump, and circuit monitoring. Direct-connected three-phase bidirectional energy analyzer
Max current 200 A 65 A
Meter fit
Accuracy class Unknown Class 1 (kWh) according to EN62053-21 / Class B (kWh) according to EN50470-3
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. Direct-connected current measurement up to 65 A; no external CTs
Monitoring
Protocol Ethernet / Wi-Fi / MQTT / emonCMS / 433.92 MHz OpenEnergyMonitor radio RS485 / 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 native cloud dependency in the reviewed source set; integration is built around Modbus RTU and supervisory systems such as PLC, SCADA, and BMS.
Home Assistant Yes Yes
Solar fit
Solar import/export Yes Yes
Buying context
Availability United Kingdom / EU through the official OpenEnergyMonitor shop; international availability depends on shipping, plug, voltage-sensor, and local installer suitability. Global / localized official product pages
Source check
Last verified Jun 10, 2026 Jun 6, 2026
Product page Official page Official page
Documentation Official docs Official docs
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