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GoodWe Smart Meter GMK120 vs Chint DTSU666

Install fit
Phase support 1P2W / 1P3W Three-phase four-wire (3P4W)
Installation DIN-rail mounted residential smart meter with included current transformers Indoor DIN-rail mounted direct-connected meter in an IP20 enclosure
Measurement CT-based single-phase / split-phase smart meter for PV consumption, load, and export-power monitoring Bidirectional three-phase smart energy meter measuring import/export energy and electrical parameters over RS485 Modbus RTU
Max current 200 A 80 A
Meter fit
Accuracy class Class 0.5 (voltage/current and active energy) / Class 1 (reactive energy) Class B / 1.0 (MID Certified)
Current sensing 2 x 200A:50mA current transformers included Direct connection 0.25-5(80)A; DTSU666-CT variants are separate CT-input models
Monitoring
Protocol RS485 / Modbus RTU RS485 / Modbus RTU
Local API Yes Yes
Cloud dependency No standalone cloud required for the meter's RS485 link to a compatible GoodWe inverter; SEMS cloud/app monitoring depends on the wider GoodWe system. No native vendor cloud dependency in the reviewed CHINT source set; integration is via local RS485 Modbus RTU to an inverter, BMS, SCADA, EMS, or gateway.
Home Assistant Yes Yes
Solar fit
Solar import/export Yes Yes
Buying context
Availability North America official page / broader regional availability varies Global CHINT product range with localized availability through CHINT subsidiaries and distributors
Source check
Last verified Jun 14, 2026 Jun 17, 2026
Product page Official page Official page
Documentation Official docs Official docs
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