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In order to satisfy local load demands, this study investigates a stand-alone renewable energy system that consists of a photovoltaic (PV) plant and a battery energy storage system (BES). To improve power extraction efficiency, the PV system makes use of Sliding Mode Control (SMC) in conjunction with Perturb and Observe (P&O) Maximum Power Point Tracking (MPPT). The BES is linked at a common DC bus to ensure system stability and continuous power supply. To improve energy conversion, an anti-windup proportional-integral (AWPI) controller is deployed in the inverter control system for active power regulation and harmonic reduction. This approach significantly minimizes Total Harmonic Distortion (THD) in inverter voltage and current, leading to superior power quality. The effectiveness of the system is confirmed by simulation results, which show improved performance in harmonic mitigation and renewable power consumption. The findings confirm that integrating SMC-based MPPT and AWPI inverter control enhances stability, efficiency, and reliability, making it a viable solution for sustainable power generation.