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CHINT DDSU666 Single-phase Smart Meter with CT
CHINT DDSU666 Single-Phase Smart Meter with CT | Wattuneed
CHINT DDSU666 Single-Phase Smart Meter with CT | Wattuneed
CHINT DDSU666 Single-phase Smart Meter with CT
CHINT DDSU666 Single-Phase Smart Meter with CT | Wattuneed
CHINT DDSU666 Single-Phase Smart Meter with CT | Wattuneed

CHINT DDSU666 Single-phase Smart Meter with CT

By Julien Mawet · Solar PV Expert at Wattuneed • Updated April 2026
€50.40
Tax included
901.00000057-0
90100000057

The Chint DDSU666 single-phase smart energy meter (CT version) is designed to act as an ultra-precise bidirectional metering unit within residential solar installations. Thanks to its external current transformer, it monitors electrical flows between the public grid and the home in real time in a completely non-invasive manner, thereby enabling the inverter to optimise the household’s overall energy self-consumption.

  • Measurement and Monitoring: This smart meter offers indirect measurement via induction using an external current clamp (compatible with the LCTA9CC-200A/100mA toroid), RS485 communication via the Modbus-RTU protocol, and a backlit LCD display for accurate monitoring of active power without the need to cut any cables.
  • This product is an essential accessory and is compatible with Sofar Solar grid-connected inverters from the KTLM-G2 and KTLM-G3 ranges (specifically including the Sofar 3KTL-M model) as well as with single-phase photovoltaic systems configured for current reading via an external current transformer (CT).
  • It allows you to configure the zero export function for full compliance with the electricity grid, whilst offering granular monitoring capabilities to maximise the performance of your photovoltaic installation.

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Chint DDSU666 Single-Phase Smart Meter (CT Version)


The Chint DDSU666 Single-Phase Smart Meter (with current clamp) is a high-precision smart energy meter, designed for the dynamic management of photovoltaic installations. Thanks to its bidirectional measurement via an external current transformer, it allows you to monitor generation, consumption and grid import and export flows in real time, in order to maximise your self-consumption rate.





Wide compatibility: Sofar Solar & Deye

The Chint DDSU666 meter (CT version) is a benchmark accessory for monitoring and managing zero injection. It is natively compatible with:

  • Sofar Solar single-phase grid-connected inverters: KTLM-G2 / KTLM-G3 series (notably the 3KTL-M model), with full integration into the SolarMan Smart app.
  • Single-phase hybrid inverters: Models and configurations requiring indirect measurement via an external current transformer.

Technical note: Communication via Modbus-RTU over an RS485 link, enabling instant analysis of power demand and precise management of grid feed-in.





Real-time monitoring via SolarMan Smart

The Chint DDSU666 transmits data directly to the inverter, providing full visibility via the SolarMan Smart app:

  • Real-time flows: generation, consumption and grid flow
  • Instantaneous solar generation
  • Automatically calculatedself-consumption rate
  • Real-timegrid import/export
  • Detailed history (day, week, month, year)
  • Smart alerts in the event of an anomaly
  • Analysis accuracy: ideal for remote monitoring of the installation





High-precision bidirectional measurement

The DDSU666 meter guarantees professional-grade accuracy for your entire energy ecosystem:


Measured flow Description
Self-consumption Solar energy consumed immediately by the household.
Flow analysis Constant monitoring of the home’s power demand to balance production.
Grid Feed-in Surplus energy fed into the public grid.
Grid Import Electricity drawn from the grid (at night or when there is little sunlight).





Simple, non-invasive installation

The DDSU666 with clamp integrates easily without major modifications to your existing single-phase installation:

  • Induction measurement: The CT clamp simply clips onto the main phase conductor.
  • No cable cutting: Maximum safety and quick installation.
  • Automatic RS485 communication
  • Compact design: Control unit on standard DIN rail (2 modules).





Key technical specifications

  • Mains: Single-phase 230V
  • Measurement type: Via external current transformer (CT clamp compatible with LCTA9CC-200A/100mA)
  • Measurement: Bidirectional (import/export)
  • Communication: RS485 – Modbus RTU
  • Display: Backlit LCD screen
  • App: SolarMan Smart (iOS / Android)
  • Applications: Residential, consumption monitoring, net zero
  • Installation: DIN rail mounting and clip-on clamp





Why choose the Chint DDSU666 meter with CT clamp?

  • Full compatibility: Specifically calibrated for Sofar Solar grid-connected inverters.
  • Safe installation: No direct contact with live conductors for electrical measurement.
  • Certified accuracy: Reliable monitoring of energy flows via magnetic induction.
  • Quick commissioning: Immediate recognition by the inverter’s monitoring system.





FAQ - Chint DDSU666 Smart Meter with Clamp

1. What is the Chint DDSU666 meter with clamp used for in my installation? +
This single-phase smart meter measures electrical flows using its external clamp. It enables your inverter to monitor grid import/export, providing you with an analysis of your self-consumption and improving the overall monitoring of your photovoltaic installation.
2. Which inverters is this clamp-on meter compatible with? +
This version of the Chint DDSU666 is certified as compatible with Sofar Solar grid-connected inverters (notably single-phase series such as the 3KTL-M), which require measurement via an external current transformer (CT).
3. Can zero export be configured with this module? +
Absolutely. By communicating with the inverter via the RS485 communication cable, the clamp’s responsiveness allows solar output to be limited to prevent any feed-in to the public grid (Zero Export), thereby ensuring your electrical system remains compliant.
4. How do I install the current clamp correctly? +
Simply open the clamp jaws and close them around the main phase cable in your home. To ensure an accurate reading, make sure you clamp only one conductor at a time (not the phase and neutral together).
5. Will consumption data be viewable remotely? +
Yes, once connected to your compatible inverter, the active power and total consumption data for your home are transmitted via your existing Wi-Fi stick and sent directly to the SolarMan Smart app.
901.00000057-0

Specific References

UPC
90100000057
EAN13
90100000057
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CHINT DDSU666 Single-phase Smart Meter with CT — Energy meter

CHINT DDSU666 Single-phase Smart Meter with CT by CHINT is available in our Energy meter catalog.

Product weight: 0.5 kg. Reference: 901.00000057-0.