The EV auxillary load’s power and energy needs are satisfied by the organic solar supercapacitor (OSSC). For the simulation using Simulink, the solar irradiance profile was adjusted to 1000 W/m2 for 30% from 10:00 am to 3:00 pm, 600 W/m2 for 30% from 3:00 pm to 5:00 pm, 200 W/m2 for 5:00 pm to 7:00 pm, and 0 W/m2 (no sunlight). The EV load receives 500 W from the supercapacitor at 1000 W/m2 of solar radiation. The OSSC’s output might cut the weight of an EV battery by approximately 7.5% and its size by 10%. Furthermore, taking into account the greenhouse gas emissions of 2.31 kgCO2/liter of gasoline, it would be able to lower them by 25%. When comparing the system response under tuned PID and FLC, the FLC performs better than the PID controller in terms of reference point tracking. While the tuned PID provides a respectable response with overshoot, the fuzzy controller retains great tracking of the reference condition.