Description
Knox Eastron SDM630MCT V2 Zero Export Device is a professional three-phase energy monitoring solution designed for solar PV installations where accurate power measurement and controlled energy export are important. It works as a CT-operated multifunction energy meter and communicates through RS485 Modbus RTU, making it suitable for integration with compatible solar inverters and energy management systems. The SDM630MCT V2 is specifically positioned for solar PV metering and zero-export applications because it can measure energy flowing in both directions.
Reliable Three-Phase Energy Monitoring
The Knox Eastron SDM630MCT V2 is designed to monitor a wide range of electrical parameters across three-phase systems. It supports 3P4W, 3P3W, and 1P2W configurations, providing flexibility for different electrical installations. The meter can measure voltage, current, active power, reactive power, apparent power, power factor, frequency, energy, and maximum demand.
Ideal for Zero Export Solar Applications
One of the most important applications of this meter is zero-export solar control. In a typical solar installation, the inverter produces electricity according to available solar energy and connected loads. When solar generation exceeds on-site consumption, excess electricity may flow toward the grid. A compatible zero-export system can use the meter’s measurements to identify this reverse flow and instruct the inverter to reduce its output.
CT Operated Design
Correct CT selection and configuration are essential for accurate readings. For example, when a 100/5A CT is installed, the meter must be configured with the appropriate CT ratio. Proper installation also helps ensure that the inverter receives reliable power-flow information for zero-export control.
RS485 Modbus Communication
The RS485 interface supports communication addresses from 1 to 247, transmission speeds from 1200bps to 38400bps, and a maximum communication distance of up to 1000 meters under suitable installation conditions. The specified response time is below 100 milliseconds.
This communication capability makes the meter useful for installations where real-time energy information needs to be shared with a central inverter or energy management system.
Accurate Electrical Measurements
Measurement accuracy is another important feature of the Knox Eastron SDM630MCT V2. According to the manufacturer’s specifications, voltage and current measurement accuracy are rated at ±0.5%, while frequency accuracy is ±0.2%. Active power, reactive power, and apparent power are specified at ±1%, with power factor accuracy rated at ±1%. Active energy can meet Class 0.5S requirements under IEC 62053-22, depending on the applicable specification and configuration.
Wide Range of Measurements
The meter provides considerably more information than basic energy consumption. It can measure kWh, kVArh, W, Var, VA, power factor, frequency, voltage, current, and demand-related parameters. It can also measure imported and exported active and reactive energy.
Compact DIN Rail Installation
The SDM630MCT V2 uses a DIN rail mounting design and occupies four modules, with a stated width of 72 mm. Its compact format makes it suitable for electrical distribution boards, solar control panels, commercial switchboards, and other installations where panel space is limited.
Suitable for Commercial Solar Systems
The Knox Eastron SDM630MCT V2 is particularly useful for commercial and industrial solar projects requiring three-phase energy monitoring and inverter communication. It can be used where accurate grid import and export information is required for energy management or zero-export functionality.
Its CT-operated architecture provides flexibility for installations with larger electrical loads, while RS485 Modbus allows the meter to communicate with compatible control equipment.
Key Features at a Glance
- Three-phase multifunction energy meter
- Designed for solar PV and zero-export applications
- Bidirectional import and export energy measurement
- CT-operated current measurement
- Supports 1A and 5A CT secondary inputs
- CT primary range from 1A to 9999A
- Supports 3P4W, 3P3W, and 1P2W systems
- RS485 Modbus RTU communication
- Two pulse outputs
- Measures voltage, current, power, energy, frequency, PF, and demand
- Compact 72 mm, four-module DIN rail design
- Suitable for commercial and industrial energy monitoring
- Supports long-distance RS485 communication under suitable conditions
Professional Solution for Energy Management
For commercial buildings, industrial facilities, and larger solar installations, this zero-export meter provides the monitoring data needed by compatible inverter systems to manage power flow more intelligently. When correctly installed, configured, and paired with compatible equipment, it offers a practical approach to monitoring electricity consumption and controlling unwanted solar export.
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