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Eastron SDM54-DM vs Carlo Gavazzi EM540

Install fit
Phase support 1P2W and 3P4W supplies. 2-phase 3-wire; 3-phase 3-wire; 3-phase 4-wire; 4-wire delta / wild-leg.
Installation DIN-rail mounted direct-connected meter. Indoor 3-DIN DIN-rail direct-connected energy analyzer for low-voltage switchboards.
Measurement Direct single/three-phase Modbus import/export energy meter. Direct-connected two/three-phase energy analyzer for import/export active energy and electrical variables over Modbus RTU.
Max current 45 A 65 A
Meter fit
Accuracy class Active energy Class 1.0 / Class B; reactive energy Class 2. Active energy Class 1; Class B MID.
Current sensing Direct connection up to 45 A; no external CTs. Direct connection up to 65 A; no external CTs for the EM540DINAV23XS1X direct-connected model.
Monitoring
Protocol RS485 Modbus RTU RS485 Modbus RTU
Local API Yes Yes
Cloud dependency No vendor cloud required; readings are available locally over RS485 Modbus RTU. No vendor cloud required for core use; EM540DINAV23XS1X exposes local RS485 Modbus RTU data.
Home Assistant Yes Yes
Solar fit
Solar import/export Yes Yes
Buying context
Availability Global Eastron product range; regional distributor availability varies. Carlo Gavazzi global product channels; stock, approvals, and distributor availability vary by country.
Source check
Last verified Jul 19, 2026 Jun 25, 2026
Product page Official page Official page
Documentation Official docs Official docs
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