Pumping irrigation is a vital method for delivering water to farmland using water pumps, ensuring an adequate water supply for crop growth, and securing grain yields. However, in remote mountainous regions and rural areas with limited access to electricity, traditional irrigation systems typically rely on fuel-powered engines to operate water pumps. This method not only results in considerable energy consumption and high operational and maintenance costs but also contributes to carbon emissions, further impacting the climate and environment. With the continuous advancements in renewable energy sources such as solar and wind power, exploring the application of these new energy technologies in agricultural irrigation is crucial for promoting energy conservation and emission reduction in the agricultural sector. The solar-powered pumping system offers a practical and feasible technological solution. This paper proposes a design methodology for a solar-powered pumping irrigation system, where a solar photovoltaic power generation system serves as the power source for the pumps, which are then integrated with the field pipelines for farmland irrigation. The system has been implemented in a demonstration farmland in the Philippines. Operational results demonstrate that it successfully provides adequate irrigation water for the crops in about 10 hectares of farmland according to design specifications, without fuel, thereby validating the system’s practical feasibility and reliability.