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OpenEnergyMonitor emonPi3 6-Channel Energy Monitor vs Acrel ADL100-ET

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 low-voltage AC system.
Installation Indoor wall-mounted CT energy monitor with emonVs voltage sensor/power supply; CTs clip around live or neutral conductors. Indoor 2P DIN-rail mounted direct-connected single-phase meter.
Measurement Six-channel CT-based AC electricity monitor with emonVs voltage reference for active power/energy and circuit monitoring. Single-phase direct-connected active-energy and electrical-parameter meter for low-voltage circuits.
Max current 200 A 60 A
Meter fit
Accuracy class Unknown Class 1 measuring accuracy.
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. Direct connection; 10 A basic current and 60 A maximum current. No external CT setup is documented for the ADL100-ET 10(60) A direct-connected configuration.
Monitoring
Protocol Ethernet / Wi-Fi / MQTT / emonCMS / 433.92 MHz OpenEnergyMonitor radio RS485 Modbus RTU on /C communication variant
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; ADL100-ET /C variants expose local RS485 Modbus RTU, while pulse output and infrared are documented on the meter.
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 with official quote/contact route; local distributor availability varies by market.
Source check
Last verified Jun 12, 2026 Jul 22, 2026
Product page Official page Official page
Documentation Official docs Official docs
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