DESIGN AND IMPLEMENTATION OF AN OUTPUT MONITORING AND CONTROL SYSTEM FOR A 4.2KVA 24V SMART SOLAR INVERTER

This project presents the design and real-time simulation of a 4.2 kVA, 24 V smart solar inverter output monitoring and control system. Many small-scale solar power users face problems such as deep battery discharge, overload, and overheating due to a lack of real-time status information and automatic protection. This work aims to address these issues by combining affordable sensors and a micro controller to create an intelligent monitoring system. The system uses an Arduino Nano to read DC voltage, load current, battery voltage, and internal temperature in real time. The data is displayed on a 20×4 LCD screen, while a relay automatically disconnects the output when unsafe conditions are detected. RGB LEDs and a buzzer provide clear local warnings, and a virtual terminal simulates remote alert messages that can be expanded to real GSM or IoT applications. Proteus simulation results confirm that the system accurately tracks parameter changes, triggers protective actions like low battery cutoff, overcurrent warning, and overheating shutdown, and prevents equipment damage. By integrating real-time monitoring and automatic control in a simple, low-cost design, this system offers a practical solution to improve the safety, reliability, and lifespan of solar inverter setups, especially for rural and off-grid users who need dependable power with minimal manual supervision.