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GoodWe Smart Meter GM1000D vs Chint DTSU666

Install fit
Phase support Single-phase Three-phase four-wire (3P4W), 220-240 V L-N / 380-415 V L-L, 50/60 Hz
Installation DIN-rail mounted indoor smart meter with included external current transformers Indoor 4-module DIN35 rail direct-connected installation; IP20 enclosure
Measurement Dual-CT single-phase AC-coupled meter for grid and PV-inverter flow, voltage, current, power, power factor, frequency, and active/reactive energy. Bidirectional three-phase direct-connected electrical-parameter and import/export energy measurement
Max current 120 A 80 A
Nominal voltage 110 / 230 Vac nominal single-phase Unknown
Meter fit
Accuracy class Class 1 (voltage/current and active energy) / Class 2 (reactive energy) Energy 1%; voltage, current and power 0.5% (DTSU666-G direct variant)
Current sensing Two included 120A:40mA CTs: CT1 on the grid path and CT2 on the AC-coupled/grid-tie PV inverter path; observe House (K) to Grid (L) orientation. DTSU666-G direct input 0.25-5(80) A; no external CT
Monitoring
Protocol RS485 / Modbus RTU RS485 / Modbus RTU
Local API Yes Yes
Cloud dependency No cloud required for local RS485 operation; SEMS is optional. No cloud required; RS-485 Modbus RTU metering is local. Remote use depends on a separate gateway or host.
Home Assistant Yes Yes
Solar fit
Solar import/export Yes Yes
Buying context
Availability United States, Canada, Mexico and Puerto Rico via GoodWe's current North America distributor network; availability elsewhere depends on the local GoodWe channel and compatible inverter market. Global CHINT product range with localized availability through CHINT subsidiaries and distributors
Source check
Last verified Oct 1, 2026 Sep 2, 2026
Product page Official page Official page
Documentation Official docs Official docs
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