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Smappee Infinity vs ABB B21 312-100

Energy Meter

Smappee Infinity

Energy Meter

ABB B21 312-100

ABB B21 312-100 / 2CMA100155R1000

Decision point	Smappee Infinity	ABB B21 312-100

Install fit
Phase support	Single-phase and three-phase installation planning, including 1P, 3P+N / 3 x 400 V, and 3P / 3 x 230 V topologies.	Single-phase, 230 V AC.
Installation	Certified-electrician distribution-board installation with Power Box, CT Hub, CTs, Solid Core CTs, or Rogowski coils usually under panel cover.	Indoor 2-DIN-rail direct-connected meter for distribution boards; qualified-electrician installation.
Measurement	Modular CT/Rogowski energy-management metering system for mains, circuits, solar PV, storage, EV charging, and major loads.	Direct-connected single-phase active/reactive energy and electrical-parameter metering with separate import/export registers.
Max current	10000 A	65 A
Meter fit
Accuracy class	Solid Core 3-Phase CT: 0.2%; other CTs depend on sensor choice.	MID Class B / IEC Class 1 active energy; reactive energy Class 2.
Current sensing	Modular CT architecture: CT Hub supports up to 4 CTs or Rogowski coils; Smappee documentation supports expansion up to 28 measured inputs.	Direct connected up to 65 A; no external current transformer required.
Monitoring
Protocol	Smappee Bus / Wi-Fi / Ethernet / Smappee Cloud / Modbus RTU / MQTT / EEBUS	RS-485 Modbus RTU / EQ Bus / S0 pulse outputs
Local API	Yes	Yes
Cloud dependency	Smappee Cloud is the normal app/dashboard path; Power Box Modbus RTU can provide local register readout for supported measurements.	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	Europe and international Smappee partner / certified-installer channels; availability varies by country, installer access, and project.	ABB global product and distributor channels; current Netherlands official channel listing verified, with regional stock and certifications varying.
Source check
Last verified	Jul 29, 2026	Aug 11, 2026
Product page	Official page	Official page
Documentation	Official docs	Official docs