This study investigates the impact of Fe3O4 (iron oxide) nanofluids on the electrical efficiency of photovoltaic electrical (PVE) systems. With high electrical conductivity, Fe3O4 nanoparticles enable effective cooling of photovoltaic (PV) cells, reducing operating temperatures and enhancing electrical output. Experiments were conducted using Fe3O4 nanofluid concentrations of 0.02, 0.05, and 0.1% by volume, tested at flow rates of 0.5 and 1.0 L per minute (LPM). Results show that at a 0.1% concentration and 1.0 LPM flow rate, the system achieved a peak electrical efficiency of 15%, a 4% increase compared to water cooling at the same flow rate. Additionally, Fe3O4 nanofluid cooling at 0.05% concentration and 1.0 LPM yielded an electrical efficiency of 14%, outperforming water cooling by approximately 3%. These findings underscore the potential of Fe3O4 nanofluids to enhance PVT system performance by maintaining lower PV cell temperatures and maximizing energy output.