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Refoss Open API Smart Energy Monitor EM16P vs ABB A41 312-100

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. Single-phase 57.7-288 V AC line-to-neutral
Installation Indoor electrical-panel CT installation with clamp-on main and branch-circuit sensors. Indoor 4-module DIN-rail direct-connected installation by a qualified electrician.
Measurement CT-based whole-home and circuit-level energy monitor with consumption, feed-in, voltage, current, power, power factor, and energy statistics. Single-phase direct-connected four-quadrant active/reactive energy and electrical-parameter metering.
Max current 200 A 80 A
Meter fit
Accuracy class +/-2% measurement accuracy MID Class B / IEC Class 1 active energy; Class 2 reactive energy
Current sensing 2 main CT sensors up to 200 A each plus 16 branch-circuit CT sensors up to 60 A each. Direct-connected measurement up to 80 A; no external CT required
Monitoring
Protocol Wi-Fi / local Web UI / Refoss Open API / MQTT / Home Assistant Unknown
Local API Yes Yes
Cloud dependency Cloud optional; offline local Web, Open API and MQTT work without app or registration. Refoss cloud is used for remote charts and long-term history. No cloud required; display and RS-485 Modbus RTU / EQ Bus provide local access.
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 ABB channels; Netherlands official listing verified; stock and certification vary by market.
Source check
Last verified Aug 31, 2026 Aug 13, 2026
Product page Official page Official page
Documentation Official docs Official docs
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