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W x H x D: 72 x 100 x 65 mm
Weight: 0.33 kg

SOFAR Solar

SOFAR Smart Meter DTSU666

Installed by Free State AG

The DTSU666 is the three-phase DIN rail energy meter that sits at the house connection point in every SolarFree package. It measures import and export on all three phases and sends the reading to the SOFAR HYD hybrid inverter over RS485, which is what lets the system prioritise self-consumption, hold a feed-in limit and cap the power drawn from the grid. The meter is built by Zhejiang Chint Instrument and Meter and sold under the SOFAR name. It exists in two versions, one wired directly into the supply up to 80 A and one that measures through 200 A / 5 A current transformers for larger connections.

Accuracy: Direct-connected version: active class 1, reactive class 2. CT version: active class 0.5S, reactive class 2
Current rating: Direct connection 0.25 to 5(80) A, no CTs. CT version 1.5(6) A with 200 A / 5 A split-core current transformers, 24 mm aperture
Installation: 35 mm DIN rail, 4 modules wide
Phases: Three-phase four-wire (3P4W)

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Technical datasheet (PDF)

Technical data

All figures for the SOFAR Smart Meter DTSU666 from the manufacturer datasheet and manual

Open datasheet (PDF)

Power

Function: Measures import and export at the point of common coupling and reports it to the inverter over RS485 for self-consumption control, feed-in limiting and grid-import capping
Own consumption: Voltage circuit 2 W / 10 VA or less

Electrical

Accuracy: Direct-connected version: active class 1, reactive class 2. CT version: active class 0.5S, reactive class 2
Measurement standard: EN 50470-1 / EN 50470-3, class B / 1.0, MID B+D certified
Current rating: Direct connection 0.25 to 5(80) A, no CTs. CT version 1.5(6) A with 200 A / 5 A split-core current transformers, 24 mm aperture
Pulse constant: 400 imp/kWh direct-connected, 6400 imp/kWh on the CT version
Nominal AC input / output voltage: 3 x 230 / 400 V AC
Measured values: Import and export kWh and kvarh, instantaneous kW, kvar and kVA, phase and total current, voltage, frequency and power factor

Grid

Phases: Three-phase four-wire (3P4W)
Rated grid frequency: 50 / 60 Hz

Connectivity

Ports: RS485
Protocol: Modbus-RTU, 9600 bps by default (1200 to 19200 selectable), 8N1, address 1 to 247
Display: LCD with backlight, LED pulse output

Mechanical

Installation: 35 mm DIN rail, 4 modules wide
Ingress protection: IP20 (front panel IP51, to be installed in a meter box of at least IP51)
Operating temperature range: -25 to +55 °C
Relative humidity: 95 or less, non-condensing %
Safety and EMC standards: IEC 61010-1:2010, IEC 61326-1:2020
Dimensions (W / H / D): 72 x 100 x 65 mm

Warranty

Manufacturer warranty: 2 years

Certifications: EN 50470-1 / EN 50470-3 (MID, class B), IEC 61010-1:2010, IEC 61326-1:2020

Source: manufacturer datasheet and installation manual, as of September 2026. Subject to change, the manufacturer documents prevail.

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SOFAR Smart Meter DTSU666 as shown by the manufacturer

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