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Refoss Open API Smart Energy Monitor EM16P vs Carlo Gavazzi EM340

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. Three phase
Installation Indoor electrical-panel CT installation with clamp-on main and branch-circuit sensors. DIN-rail mounted direct-connected energy analyzer
Measurement CT-based whole-home and circuit-level energy monitor with consumption, feed-in, voltage, current, power, power factor, and energy statistics. Direct-connected three-phase bidirectional energy analyzer
Max current 200 A 65 A
Meter fit
Accuracy class +/-2% measurement accuracy Class 1 (kWh) according to EN62053-21 / Class B (kWh) according to EN50470-3
Current sensing 2 main CT sensors up to 200 A each plus 16 branch-circuit CT sensors up to 60 A each. Direct-connected current measurement up to 65 A; no external CTs
Monitoring
Protocol Wi-Fi / local Web UI / Refoss Open API / MQTT / Home Assistant RS485 / 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 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 States and Canada through Refoss official online store; broader availability depends on regional store and reseller channels. Global / localized official product pages
Source check
Last verified Jun 8, 2026 Jun 6, 2026
Product page Official page Official page
Documentation Official docs Official docs
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