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OpenEnergyMonitor emonPi3 6-Channel Energy Monitor vs ABB B21 312-100

Install fit
Phase support Single-phase, North American split-phase, and 3-phase 4-wire; 3-wire 3-phase unsupported. Single-phase, 230 V AC.
Installation Indoor wall mount with emonVs. CTs clip around live or neutral, not both; hardwired emonVs supply requires a suitably competent installer. Indoor 2-DIN-rail direct-connected meter for distribution boards; qualified-electrician installation.
Measurement Six-channel CT-based AC electricity monitor with emonVs voltage reference for active power/energy and circuit monitoring. Direct-connected single-phase active/reactive energy and electrical-parameter metering with separate import/export registers.
Max current 200 A 65 A
Meter fit
Accuracy class Unknown MID Class B / IEC Class 1 active energy; reactive energy Class 2.
Current sensing 6 CT inputs. Default: 333 mV voltage-output CTs, 20-200 A. Current-output CTs require burden-resistor solder bridges and calibration. Direct connected up to 65 A; no external current transformer required.
Monitoring
Protocol Ethernet / Wi-Fi / MQTT / emonCMS / 433.92 MHz OpenEnergyMonitor radio RS-485 Modbus RTU / EQ Bus / S0 pulse outputs
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; measurements are read locally over RS-485 Modbus RTU, EQ Bus, S0 pulse, or the front display.
Home Assistant Yes Yes
Solar fit
Solar import/export Yes Yes
Buying context
Availability Sold from the UK with international shipping offered at checkout; destination suitability depends on mains topology, emonVs option, CT selection, local electrical rules, and import taxes/fees. ABB global product and distributor channels; current Netherlands official channel listing verified, with regional stock and certifications varying.
Source check
Last verified Aug 20, 2026 Aug 11, 2026
Product page Official page Official page
Documentation Official docs Official docs
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