Multiport DC-DC converters are essential for modern renewable energy systems where the integration of multiple energy sources and dynamic loads demands flexible, reliable, and efficient power management. However, conventional two-port converter topologies face significant limitations when addressing high-power applications exceeding 600 W, particularly under fluctuating input and load conditions. To overcome these challenges, this paper proposes a novel four-port nonisolated bidirectional DC-DC converter designed specifically for solar photovoltaic (PV) and grid-integrated energy systems. The converter supports multiple operating modes—Single Input Triple Output (SITO), Single Input Double Output (SIDO), Double Input Double Output (DIDO), and Single Input Single Output (SISO)—allowing adaptable power flow between solar PV, energy storage systems (ESS), DC loads, and AC loads via an inverter. A key innovation of this work lies in the use of a cost-effective Arduino UNO microcontroller to govern the MOSFET-based switching system. Compared to conventional control techniques, the Arduino-based controller significantly reduces complexity, cost, and component count while improving switching efficiency. The converter architecture further minimizes switching losses by employing fewer switches, enhancing overall performance for high-power applications. The system is simulated under both open-loop and closed-loop configurations using PSIM and Proteus software to evaluate functionality across various operational states and load conditions. A hardware prototype is developed to experimentally validate the simulation results under real-world constraints, including switching losses, voltage drops, and parasitic effects. The comparative analysis reveals a 10% average deviation between simulation and hardware results, which is within acceptable limits for practical deployment. Across all operating modes, the converter maintains stable power delivery, demonstrating high reliability and system adaptability. The results confirm that the proposed four-port converter is well-suited for solar PV-powered systems, energy storage integration, and electric vehicle (EV) applications, offering enhanced scalability, control simplicity, and energy transfer efficiency. © 2025 Elsevier B.V., All rights reserved.