String Monitoring Card - SERTEL

Description

The SERTEL SEPL300_SMC is a String Monitoring Card (SMC) designed for real-time monitoring of DC current, voltage, power, temperature, and individual string currents in photovoltaic solar installations. The card enables plant operators and SCADA systems to monitor the performance of each individual PV string, facilitating rapid fault detection, yield optimisation, and preventive maintenance. The SEPL300_SMC is available in two channel configurations - 16-string and 24-string - and supports multi-protocol communication via RS-485 (Modbus RTU), Optical Fibre, and optional Wireless (LoRa) interfaces. Computed parameters including DC current, DC voltage, total string current, DC power, and status data are accessible via Modbus registers for seamless integration with SCADA, data concentrators, and monitoring platforms. Standard Features • Bi-directional current measurement capability (available on request) • Built-in automatic fault diagnosis with status indication via on-board LED display • Three-stage electrical isolation for enhanced protection of monitoring electronics • Redundant communication output supporting multiple simultaneous interface connections • Multiple simultaneous temperature readings via on-board and external RTD inputs • Calculated parameters - DC current, voltage, total current, DC power, and device status - accessible via Modbus • Standard per-string current rating of 30 A, with up to 80 A available on request • DC voltage reading capability up to 2100 V DC for high-voltage PV array compatibility