Device Overview
The Eastron SDM54-DM is a compact direct-connected DIN-rail energy meter for installations that need three-phase or single-phase Modbus metering without external current transformers. It is most relevant for EV charging metering, small commercial sub-metering, panel monitoring, and import/export energy visibility where a 45 A direct-load meter is enough.
Core Features
The official SDM54-DM product page lists multi-parameter measurement for kWh, kVArh, watts, reactive power, apparent power, voltage, current, power factor, frequency, and maximum demand. It also identifies RS485 Modbus communication, bidirectional measurement, MID approval, and 1P2W / 3P4W wiring support.
Installation And Measurement
This record treats SDM54-DM as a direct-connected energy meter. The exact product page lists a 45 A maximum direct load, 5 A rated current, 0.5 A minimum current, and 230 V / 120 V line-to-neutral voltage context. The meter is designed for DIN-rail mounting with IP51 front protection. Because it is direct-connected, it is not a CT-input meter and should not be compared with high-current CT-operated models as if the current range were expandable.
Communication And Integration
RS485 Modbus RTU is the key integration route. The official page lists addresses 1 to 247, transmission distance up to 1000 m, 2400 to 38400 bps speed, and configurable parity/stop-bit options. Core metering is local over Modbus, so no Eastron vendor cloud is required. Home Assistant support should be understood as standards-based Modbus integration through suitable RS485 hardware, not as a native Eastron cloud integration.
Solar, EV, And Sub-Metering Fit
The page positions SDM54-DM for charging-pile metering and describes imported/exported active and reactive energy measurement. That makes it useful for energy accounting around EV charging circuits, small three-phase loads, and import/export monitoring points, as long as the installation stays within the direct 45 A rating.
Limits And Source Notes
The exact SDM54-DM page states 45 A direct load. Eastron's broader SDM54 Series manual and datasheet describe 100 A series variants, so this page keeps the comparison value at 45 A for the exact SDM54-DM product record rather than borrowing the larger family value.