<![CDATA[Rainfed agriculture is highly vulnerable to rainfall variability and limited irrigation infrastructure, resulting in unstable agricultural production, particularly during prolonged dry periods. This study aimed to develop a detailed engineering design for an integrated solar-powered irrigation system equipped with Internet of Things monitoring for rainfed farmland in Kembang Sari Village. The study employed a research-and-development approach focusing on electrical-load analysis, photovoltaic and battery sizing, pump and reservoir configuration, hydraulic-system design, and sensor-based monitoring architecture. The proposed system integrates photovoltaic modules, a solar charge controller, lithium iron phosphate batteries, an inverter, a 1.5-hp irrigation pump, a water reservoir, and sensors for soil moisture, water level, flow rate, battery condition, and pump status. The results showed a total connected load of 1,156 W and a daily energy requirement of approximately 6,019 Wh. Considering an overall system efficiency of 80% and five peak-sun hours per day, the required generation capacity was estimated at 7,523.75 Wh/day. The recommended configuration consists of seven 250-Wp photovoltaic modules with a total capacity of 1.75 kWp, a minimum 50-A charge controller, a 6-kW inverter, and two 48-V 100-Ah lithium iron phosphate batteries. The hydraulic subsystem uses a pump with an estimated 12-m head and a 36-m³ reservoir to support a target water supply of approximately 36 m³/day. The integrated monitoring system enables remote supervision, automatic protection, and data-informed irrigation management. The design provides a technically coherent basis for prototype construction, although field validation is required to assess actual solar generation, pump performance, water adequacy, sensor reliability, maintenance requirements, and economic feasibility.]]>
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