Device Overview

The Fronius Smart Meter 63A-3 is a three-phase smart electricity meter for Fronius PV systems. It is designed to measure energy flowing to household loads or back to the public grid, then send that information to a Fronius inverter or Fronius Datamanager over Modbus RTU / RS485.

For homeowners and installers, its main value is not as a standalone app-first monitor. It is most useful when the site already uses a Fronius inverter ecosystem and needs better self-consumption visibility, dynamic feed-in control, or Solar.web consumption data.

Core Features

  • Direct-connected three-phase metering up to 3 x 63 A.
  • 400-415 V nominal three-phase system context.
  • Class 1 / Class B active-energy accuracy according to Fronius technical data.
  • Modbus RTU / RS485 communication to a compatible Fronius inverter or Datamanager.
  • Bidirectional measurement for consumption, feed-in, and load-curve recording.
  • Indoor DIN-rail installation in a 4-module housing.

Installation And Measurement Fit

This is a direct-connected meter, not a CT-clamp meter. That makes the maxCurrentAmps and currentSensorSetup fields important for comparison: the 63A-3 model is best suited to three-phase circuits within its 63 A per-phase rating, while larger sites may need a CT-based Fronius Smart Meter variant instead.

The device is intended for indoor DIN-rail installation and should be installed by a qualified professional as part of a Fronius system design.

Compatibility And Data Access

The meter communicates over Modbus RTU / RS485 to the Fronius inverter or Datamanager. Local Home Assistant visibility is best understood through the Fronius inverter or datalogger Solar API path; it is not recorded here as a standalone meter-native LAN API.

Solar.web and app visibility depend on the connected Fronius system and account setup. The meter itself supplies the consumption and feed-in data that the Fronius system uses for monitoring and dynamic feed-in control.

Best Fit

This device is a strong fit for three-phase Fronius PV systems where the buyer needs accurate consumption and grid-flow data, especially when feed-in limitation, self-consumption optimisation, or Solar.web reporting are part of the project.

It is less suitable when the buyer wants a vendor-independent Wi-Fi meter, a standalone Home Assistant device, or a higher-current CT-based metering setup.

Source Notes

Verified against Fronius official Smart Meter 63A-3 technical data, Fronius digital operating instructions, and Home Assistant's Fronius integration documentation on 2026-06-15.