In developing countries such as India, there is a significant dependency on fossil fuels, which make up a substantial 70 % of their overall energy requirements. Nevertheless, this reliance becomes increasingly precarious as global reserves of fossil fuels continue to deplete due to their extensive consumption. Biodiesel offers a sustainable alternative to conventional fossil fuels, contributing to reduced greenhouse gas emissions and enhanced energy security. This research centres on developing a solar energy powered transesterification system for biodiesel production using a KOH catalyst. The main goal is to address technological, economic, and sustainability challenges in biodiesel manufacturing. Extensive experiments were conducted over five days to thoroughly assess the efficiency of this innovative solar reactor. The innovative solar biodiesel synthesis system consistently achieves an impressive average biodiesel conversion rate of 90.8 % when operated under specific reaction conditions. Furthermore, the system's energy efficiency, calculated at 9.08×10−5g/J, outperforms the energy efficiency of traditional methods. Additionally, the properties of the biodiesel produced fall well within the specified limits defined by the ASTM D6751 standards. These collective findings underscore the considerable potential of proposed novel reactor as an eco-friendly and sustainable approach to biodiesel production.