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GoodWe Smart Meter GMK140 vs Chint DTSU666

Install fit
Phase support 1P2W / 1P3W 3P4W (three-phase, four-wire)
Installation DIN-rail mounted residential smart meter with included current transformers DIN-rail mounted direct-connected smart energy meter
Measurement CT-based single-phase / split-phase smart meter for PV consumption, load, and export-power monitoring Direct-connected three-phase smart energy meter with bidirectional measurement
Max current 200 A 80 A
Meter fit
Accuracy class Class 0.5 (voltage/current and active energy) / Class 1 (reactive energy) Class 1 / MID Class B
Current sensing 4 x 200A:50mA current transformers included Direct-connected up to 80A; CT-input variants also exist
Monitoring
Protocol RS485 / Modbus RTU RS485 / Modbus RTU
Local API No No
Cloud dependency GoodWe SEMS and compatible GoodWe inverter workflows are typically used for normal monitoring, export-power limiting, and household load visibility. No native cloud dependency in the reviewed source set; integration is built around RS485 Modbus RTU with inverter, BMS, and energy-management systems.
Home Assistant No No
Solar fit
Solar import/export Yes Yes
Buying context
Availability North America official page / GoodWe residential ecosystem availability varies by market Global
Source check
Last verified May 19, 2026 May 18, 2026
Product page Official page Official page
Documentation Official docs Official docs
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