Design and Evaluation of a Low-Cost Solar-Powered Water Pump System

Thesis Abstract

Access to reliable and affordable water supply remains a persistent challenge in rural and peri-urban communities, particularly in regions where grid-based electricity is inaccessible or unreliable. Traditional water pumping systems are often prohibitively expensive and energy-dependent, resulting in limited water access and economic constraints for small-scale farmers, community water schemes, and household users. This study aims to design, develop, and evaluate a cost-effective solar-powered water pumping system tailored for low-income settings to enhance water access sustainability. The specific objectives include assessing the technical feasibility of integrating photovoltaic panels with low-cost pump components, evaluating the system’s hydraulic performance under varying environmental conditions, and comparing the operational efficiency and cost-effectiveness against conventional electric and manual pumps. The research adopts a mixed-methods approach, combining qualitative assessments of user perceptions and technical design validation with quantitative experimental testing. The study population comprises community members and smallholder farmers within rural regions of the country, with a sampled population of 150 households selected through stratified random sampling to ensure representation of different water draw-off demands and socio-economic levels. The experimental component involves constructing a prototype system utilizing locally sourced photovoltaic modules, low-cost submersible pumps, and locally fabricated control systems. Data collection instruments include performance measurement tools such as flow meters, pressure gauges, and power consumption monitors, complemented by structured questionnaires and semi-structured interviews to gather user feedback and system usability information. Data analysis employs descriptive statistics to summarize system performance metrics, while inferential analysis, notably regression analysis, is utilized to examine relationships between environmental variables (solar irradiance, temperature) and pump efficiency. Thematic analysis is applied to qualitative data to explore user satisfaction, perceived reliability, and maintenance ease. Validation of experimental results follows replicability tests and cross-validation with industry standards for solar pump systems. Expected findings indicate that the proposed system can achieve a reliable flow rate of at least 2 cubic meters per hour with a capital cost reduction of approximately 35% relative to commercially available systems. The system’s efficiency is anticipated to be highly correlated with solar irradiance levels, with optimized tilt angles enhancing performance. Additionally, the low-cost pump components and locally fabricated control systems are expected to demonstrate durability comparable to more expensive commercial counterparts within a 12-month operational period. The study aims to confirm that the integration of locally available materials, combined with simplified solar PV configurations, can produce a sustainable and scalable solution for off-grid water pumping needs. This research contributes to knowledge by providing a replicable framework for designing affordable solar water pumps tailored to low-income and resource-constrained environments, addressing gaps in the current literature on low-cost renewable energy solutions for water access. It extends theoretical understanding by applying the Diffusion of Innovation theory to user adoption and the Hydraulics theory for system performance. The study’s methodological innovations include a comprehensive evaluation of system performance in real-world conditions combined with socio-economic feasibility analysis. The main conclusion emphasizes that low-cost, locally fabricated solar-powered water pumps have significant potential to improve water security in underserved communities, with economic benefits outweighing initial investment costs over time. Based on these findings, recommendations include promoting capacity-building workshops for local artisans, encouraging policy incentives for renewable energy adoption in rural water schemes, and further research focusing on long-term maintenance and adaptation strategies. Future studies are suggested to explore scalability, integration with rainwater harvesting, and the use of innovative materials to further reduce costs and enhance system resilience.