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Eastron SDM120-M vs Eastron SDM230-Modbus

Install fit
Phase support Single-phase two-wire (1P2W / 1P+N), 230 V nominal and 85-276 V AC operating range, 50/60 Hz. Single-phase 1P2W / 1P+N; 230 V nominal, 100-240 V L-N, 50/60 Hz.
Installation Indoor 35 mm DIN-rail direct-connected installation by a qualified electrician; one module / 18 mm wide, 18 x 118 x 64 mm, IP51. Indoor 35 mm DIN-rail direct-connected installation; 36 x 100 x 63 mm, IP51, CAT III.
Measurement Single-phase RMS electrical-parameter and bidirectional active/reactive import-export energy measurement with demand data and two passive pulse outputs. RMS electrical parameters, maximum demand and bidirectional active/reactive energy.
Max current 45 A 100 A
Meter fit
Accuracy class Active energy Class 0.5/1 and Class C/B; reactive energy Class 2. Active Class 1 / Class B; reactive Class 2.
Current sensing Direct-connected whole-current meter: 5 A base current, 0.15 A minimum, 40 mA starting current and 45 A maximum; no external CTs. Direct input: 10 A base, 0.5 A minimum, 40 mA starting current and 100 A maximum; no external CTs.
Monitoring
Protocol RS485 Modbus RTU / DLT645 / pulse output RS485 Modbus RTU / DLT645 / pulse output
Local API Yes Yes
Cloud dependency No vendor cloud required; local readings are available through RS485 Modbus RTU and pulse outputs. No vendor cloud required; readings are available locally through RS485 Modbus RTU and pulse outputs.
Home Assistant Yes Yes
Solar fit
Solar import/export Yes Yes
Buying context
Availability Global Eastron product range; certification, stock, and model suffix availability vary by market. Global Eastron product range through Eastron and regional distributors; MID/ETL variant availability and local stock vary by market.
Source check
Last verified Aug 27, 2026 Aug 28, 2026
Product page Official page Official page
Documentation Official docs Official docs
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