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GoodWe Smart Meter GM330 vs Chint DTSU666

Install fit
Phase support 1P2W / 3P3W / 3P4W Three-phase four-wire (3P4W), 220-240 V L-N / 380-415 V L-L, 50/60 Hz
Installation Indoor 4-module DIN-rail installation with separate external 5 A-secondary CTs; IP20. Indoor 4-module DIN35 rail direct-connected installation; IP20 enclosure
Measurement CT-operated grid-connection meter for PV consumption, demand, load and export-power control; not a utility billing meter. Bidirectional three-phase direct-connected electrical-parameter and import/export energy measurement
Max current 5000 A 80 A
Meter fit
Accuracy class Class 0.5 (voltage/current and active energy) / Class 1 (reactive energy) Energy 1%; voltage, current and power 0.5% (DTSU666-G direct variant)
Current sensing External nA:5A CTs required and not bundled; SolarGo-configured ratio, with 200-5000 A primary ratings documented for SMT-US use. 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 metering or wired RS485 control; GoodWe apps and SEMS are optional system-level monitoring paths. No cloud required; RS-485 Modbus RTU metering is local. Remote use depends on a separate gateway or host.
Home Assistant No Yes
Solar fit
Solar import/export Yes Yes
Buying context
Availability North America official page / broader global GoodWe commercial smart-meter availability Global CHINT product range with localized availability through CHINT subsidiaries and distributors
Source check
Last verified Sep 1, 2026 Sep 2, 2026
Product page Official page Official page
Documentation Official docs Official docs
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