To put this into perspective, let's consider a rough estimate of the power consumption of a Tesla Model 3. According to various sources, the vehicle's onboard computer (ECU) consumes around 100-200 watts of power when idle. Assuming an average electricity cost of 12 cents per kilowatt-hour (kWh), this translates to around $3-6 per month in electricity costs for a single vehicle.
However, as the number of vehicles increases, the total power consumption would skyrocket, making it economically unfeasible. Moreover, the charging process itself would add additional power requirements, making it even more challenging to manage the energy consumption.