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OpenEnergyMonitor emonPi3 6-Channel Energy Monitor vs Acrel ACR10R-D16TE

Install fit
Phase support Single-phase and 3-phase 4-wire; 3-wire 3-phase is not supported by the documented emonVs option. Single-phase AC metering for PV/inverter cabinet and energy-demand monitoring.
Installation Indoor wall-mounted CT energy monitor with emonVs voltage sensor/power supply; CTs clip around live or neutral conductors. Indoor DIN35 rail meter with external 16 mm split-core CT.
Measurement Six-channel CT-based AC electricity monitor with emonVs voltage reference for active power/energy and circuit monitoring. Single-phase external-CT multifunction energy meter for electrical parameters and active/reactive energy.
Max current 200 A 120 A
Meter fit
Accuracy class Unknown Active energy 0.5 level; reactive energy 1 level.
Current sensing 6 CT inputs; supports 333 mV voltage-output CT sensors, with OpenEnergyMonitor shop options for 20 A, 50 A, 100 A, and 200 A CTs. External split-core current transformer, 16 mm through size; 120 A max current configuration shown on the official product page.
Monitoring
Protocol Ethernet / Wi-Fi / MQTT / emonCMS / 433.92 MHz OpenEnergyMonitor radio RS485 Modbus RTU
Local API Yes Yes
Cloud dependency No vendor cloud required for local Emoncms on the emonPi3; optional remote posting to Emoncms.org, MQTT, or other services. No vendor cloud required for core metering; local RS485 Modbus RTU is documented.
Home Assistant Yes Yes
Solar fit
Solar import/export Yes Yes
Buying context
Availability UK / international OpenEnergyMonitor shop availability; installation suitability depends on local mains system, selected emonVs option, CT choices, and electrical rules. Global Acrel product range; local distributor and inverter-bundle availability varies.
Source check
Last verified Jun 12, 2026 Jul 23, 2026
Product page Official page Official page
Documentation Official docs Official docs
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