This paper presents the design and implementation of a prototype of solar-based smart electric vehicle (EV) electrical charging and monitoring system using ESP32 microcontroller and IoT technology. The proposed system is developed as a low-cost and compact system for the renewable energy assisted charging by integrating the solar input stage, 3S lithium-ion battery pack, voltage and current sensing modules, a relay-based control unit and a 16×2 LCD for local display. The ESP32 continuously acquires the real-time electrical parameters at both the solar input side and the battery/output side and processes the measured data and sends the monitored values to a web-based dashboard via Wi-Fi for remote supervision. A buck converter is used for regulating the solar input to charging the battery safely, while the control logic ensures safe charging operation. Experimental implementation of the prototype provides real-time effective monitoring, controlled charging and IoT-based visualization which renders the system as a practical proof-of-concept for smart solar EV charging applications.

This paper presented the design and implementation of a prototype solar-based smart electric vehicle (EV) charging and monitoring system using an ESP32 microcontroller. The developed system successfully combines solar input regula-tion, battery charging, voltage and current sensing, relay-based control, local LCD display, and IoT-enabled remote monitoring in a compact embedded platform. The proposed prototype was capable of monitoring source-side and battery/load-side electrical parameters in real time, displaying the measured values locally, and transmitting the data to a web-based dashboard via Wi-Fi. The experimental results confirmed the successful operation of the sensing, control, and com-munication modules under different experimental conditions, including no-battery, battery-connected, and controlled source-input validation. The relay-based charging logic demonstrated safe and effective control of the charging operation at the prototype level by enabling charging only under valid condi-tions. Overall, the proposed system validates the feasibility of a low-cost and compact solar-enabled EV charging architecture, confirming the concept of monitored and controlled charging for renewable-energy-assisted EV applications. Although the current work is limited to prototype-scale implementation, it provides a practical proof-of-concept for further advancement of intelligent renewable-energy-based EV charging systems in the future.

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