 Photovoltaic-slash-thermal systems are highly efficient due to their simultaneous absorption of solar radiation and generation of electricity and heat. This paper examines the impact of red wine, RGO-slash-H2O nanofluid and paraffin wax on the thermohydrolics of a photovoltaic-slash-thermal system. Three innovative serpentine tube configurations were tested, each featuring different materials and concentrations of nanofluids. The results showed that the use of paraffin C18 increased electrical efficiency, while paraffin C22 improved thermal efficiency. Additionally, the incorporation of phase change materials and innovative geometries resulted in a notable increase in outlet temperature of the fluid, reducing the temperature of the photovoltaic cells by up to 21.55 K. Overall, the new model demonstrated significant improvements in both thermal and electrical efficiency compared to the simple model, reaching a maximum thermal efficiency improvement of 69.2% and a maximum electrical efficiency improvement of 11.7%. This article was authored by Hosein Nabi, Mosey Ebgolinia, Meneke Adani, and others. We are article.tv, links in the description below.