Systems: A Sustainability Perspective

Global agriculture faces increasing pressure due to escalating water scarcity, driven by climate change and unsustainable conventional irrigation practices. This research investigates the development and sustainability assessment of fully autonomous, solar-powered irrigation systems (SAPIS) designed to optimize water usage while minimizing reliance on external energy sources. The proposed system architecture integrates photovoltaic (PV) energy harvesting, advanced soil moisture sensing networks, and microcontroller-based predictive control algorithms. The methodology involved system modeling, component sizing (including battery storage calculations to ensure operational continuity during low insolation periods), and the simulation of control logic based on real-time environmental feedback. Key findings demonstrate that SAPIS can achieve water use efficiencies exceeding ۹۰% compared to traditional flood irrigation, significantly reducing agricultural water stress. Economically, the levelized cost of water (LCOW) for SAPIS showed a favorable Return on Investment (ROI) within ۴-۶ years, contingent on local irradiance levels and energy tariffs. Environmentally, the displacement of diesel generators results in substantial carbon emission reductions. Socially, these systems promote energy independence in remote agricultural areas. The primary limitations identified include the high initial capital investment and the necessity for robust battery management systems to handle solar intermittency. This paper concludes that SAPIS represents a critical technological paradigm shift towards climate-resilient and genuinely sustainable agricultural water management.