Eastron SDM120CT Energy Meter – Single Phase CT Operated

Eastron SDM120CT: The Compact CT Energy Meter for Smart Single-Phase Monitoring

The Eastron SDM120CT is a DIN-rail mounted, CT-operated single-phase energy meter designed for accurate energy tracking in residential, solar, and light commercial installations. Its compact size and built-in Modbus RTU protocol make it ideal for integration with smart monitoring systems, BMS platforms, and inverter-connected setups.

Whether you’re looking to track import/export data or monitor solar yield, the SDM120CT is a tried-and-tested meter trusted across the renewables and sub-metering industries.

CT-Operated for High Load Flexibility

Unlike direct connection meters, this model uses current transformers (CTs) to safely monitor larger loads, up to 100A depending on the CT ratio. This makes it suitable for use where in-line metering is impractical or unsafe, offering an ideal solution for solar, battery, and EV integrations.

• Supports 1A/5A secondary CT inputs
• Easy CT calibration via front-panel configuration
• Secure screw terminals for input/output wiring

Real-Time Data and Clear LCD Display

The SDM120CT provides real-time measurement of key parameters including voltage, current, active energy (kWh), and power factor. All values are shown on a backlit LCD screen for easy visibility in electrical cupboards or low-light areas.

Pulse Output and RS485 Modbus Integration

This model comes with both a pulse output and RS485 Modbus RTU support. It can be configured to feed energy data directly into solar inverters, energy management software, or home automation systems, making it a versatile part of any modern smart energy setup.

Built to Last in Tight Spaces

With its DIN-rail format and compact width, this meter is ideal for installations with limited enclosure space. It’s IP51 rated for indoor use and designed to meet the EN62053 standard for energy accuracy.

Why Evergy Recommends This Product

We recommend the Eastron SDM120CT for customers seeking a cost-effective, CT-operated metering solution with Modbus support. It’s perfect for solar generation tracking, sub-metering rental units, or integrating with off-grid energy systems where remote monitoring matters.

Ideal for…

This unit is ideal for domestic properties with CT-based solar setups, retrofitted smart systems, and commercial projects where electrical loads exceed direct metering limits.

Technical Specifications

• Voltage Input: 230V AC (single phase)
• CT Input: 1A or 5A secondary
• Accuracy: Class 1 (IEC62053-21)
• Comms: RS485 Modbus RTU + Pulse output

For full specs, see the downloadable data tab.

Enhance Your Solar Setup

This meter integrates well with our full range of solar inverters and smart meters and optimisers. Need installation advice? Visit our contact page or browse our blog on solar systems for UK homes.

FAQs

Does this include a CT clamp?
No, compatible 1A or 5A CT clamps must be purchased separately.

Can this meter be used with solar inverters?
Yes, it’s widely used in solar and battery systems with Modbus RTU support.

Is it suitable for outdoor use?
No, it should be installed indoors in a protected enclosure (IP51 rated).