Solar-powered mobile medical units (MPUs) have been introduced in various regions to address healthcare disparities, particularly in underserved areas of Southern Africa. A mixed-methods approach was employed, including surveys, interviews, and cost-benefit analyses to assess the effectiveness and sustainability of MPUs in delivering healthcare services. Socioeconomic data indicated that MPUs led to a $100 increase in household income per month for beneficiaries, with significant reductions in transportation costs attributed to their mobile nature. MPUs have demonstrated considerable economic benefits and improved accessibility by providing consistent medical care where traditional facilities are scarce or unreliable. Further research should explore scalability of these units across different geographical contexts while addressing potential energy supply challenges. Solar-Powered Mobile Units, Accessibility, Economic Impact, Southern Africa, Healthcare Disparities Treatment effect was estimated with $\text{logit}(p_i)=\beta_0+\beta^\top X_i$, and uncertainty reported using confidence-interval based inference.