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GoodWe Smart Meter GMK120 vs Chint DTSU666

Install fit
Phase support Single-phase and split-phase; 120 V L-N and 208/240 V L-L, 50/60 Hz. Three-phase four-wire (3P4W)
Installation Indoor IP20 DIN-rail installation in a distribution box; waterproof cover required outdoors. Indoor DIN-rail mounted direct-connected meter in an IP20 enclosure
Measurement External-CT grid-point voltage, current, energy, load and import/export reference measurement; not utility billing. 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 Two 200A:50mA measurement CT inputs; current GoodWe guide packing list states GMK120 CT x 3. 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 Local RS485 meter-to-inverter control needs no cloud; remote monitoring uses the inverter's Wi-Fi/Ezlink cloud connection. 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 Aug 19, 2026 Jul 12, 2026
Product page Official page Official page
Documentation Official docs Official docs
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