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Refoss Open API Smart Energy Monitor EM16P vs ABB A43 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. Three-phase three-wire and four-wire systems (2- and 3-element metering)
Installation Indoor electrical-panel CT installation with clamp-on main and branch-circuit sensors. Indoor 7-module DIN-rail direct-connected installation; professional three- or four-wire panel wiring required.
Measurement CT-based whole-home and circuit-level energy monitor with consumption, feed-in, voltage, current, power, power factor, and energy statistics. Three-phase direct-connected four-quadrant meter for active/reactive/apparent energy, import/export, electrical parameters, and multi-tariff sub-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 80 A measurement; no external CT required
Monitoring
Protocol Wi-Fi / local Web UI / Refoss Open API / MQTT / Home Assistant RS-485 Modbus RTU / EQ Bus / infrared interface / configurable pulse-alarm I/O
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 vendor cloud is required; readings and configuration are available locally over RS-485 Modbus RTU / EQ Bus and the meter display.
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 product range; official localized product and distributor routes cover Europe, the Americas, Middle East/Africa, and Asia-Pacific, with stock and certification varying by market.
Source check
Last verified Aug 31, 2026 Aug 12, 2026
Product page Official page Official page
Documentation Official docs Official docs
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