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GoodWe Smart Meter GMK120 vs Chint DTSU666

Install fit
Phase support Single-phase and split-phase; nominal 120 V L-N and 208/240 V L-L, 50/60 Hz; voltage range 0.88Un-1.1Un. Three-phase four-wire (3P4W), 220-240 V L-N / 380-415 V L-L, 50/60 Hz
Installation Indoor IP20 DIN-rail installation in a distribution box; waterproof cover required outdoors. Indoor 4-module DIN35 rail direct-connected installation; IP20 enclosure
Measurement External-CT grid-point voltage, current, energy, load and import/export reference measurement; not utility billing. Bidirectional three-phase direct-connected electrical-parameter and import/export energy measurement
Max current 200 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 Two 200 A:50 mA external measurement-CT inputs. The guide lists three supplied CT pieces; supplied quantity is not the measurement-channel count. 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 Local RS485 meter-to-inverter control needs no cloud; remote monitoring uses the inverter's Wi-Fi/Ezlink cloud connection. 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 North America; current GMK120 supply is market-specific and should be confirmed with GoodWe or an authorized distributor. Global CHINT product range with localized availability through CHINT subsidiaries and distributors
Source check
Last verified Sep 26, 2026 Sep 2, 2026
Product page Official page Official page
Documentation Official docs Official docs
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