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OpenEnergyMonitor emonTx6 vs Carlo Gavazzi EM340

Install fit
Phase support Single-phase and 3-phase 4-wire AC monitoring. Three phase
Installation Wall-mounted wireless CT monitoring node used with emonVs voltage sensor and clip-on CT sensors. DIN-rail mounted direct-connected energy analyzer
Measurement CT-based six-channel AC electricity monitoring expander for OpenEnergyMonitor systems. 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 inputs for 333 mV voltage-output CT sensors; official shop options include 20 A, 50 A, 100 A, and 200 A CTs. Direct-connected current measurement up to 65 A; no external CTs
Monitoring
Protocol Unknown RS485 / Modbus RTU
Local API Yes Yes
Cloud dependency No vendor cloud is required when readings are logged through local emonPi3 / emonBase / EmonCMS paths; remote EmonCMS.org posting 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 via OpenEnergyMonitor official shop; international availability depends on shop shipping, taxes, stock, and local electrical suitability. Global / localized official product pages
Source check
Last verified Jun 16, 2026 Jun 6, 2026
Product page Official page Official page
Documentation Official docs Official docs
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