Which battery trade-offs matter for an electric autonomous fleet?
Instruction: An illustrative vehicle has 80 kWh usable pack energy and consumes 20 kWh per 100 km for traction. Its added autonomy equipment draws 1.5 kW for an 8 hour shift. Compute the equipment energy and simplified remaining traction range, then explain why a cell-level energy-density claim is insufficient for a fleet decision.
For arithmetic only, assume the usable energy already accounts for the required reserve, constant traction consumption, and no other loads or charging during the shift. These assumptions do not constitute a range or safety prediction for a real vehicle.
Updated
Worked answer
The added equipment uses 1.5 kW*8 h=12 kWh. That leaves 80-12=68 kWh for traction, giving 68/(20/100)=340 km under the supplied assumptions. Ignoring the added equipment would produce 400 km. A 400 km shift would require 92 kWh under this simplified budget, before any loads or reserve not already included in the assumptions.
For a real decision, evaluate the complete pack and duty cycle: usable energy across temperature and aging, charging time, power capability, thermal management, mass, cost, serviceability and manufacturing evidence. Cell-level energy density does not translate directly into pack-level range because structure, cooling, protection and operating limits matter. Solid-state or other chemistry labels do not by themselves establish a safe or commercially suitable pack.
Measure actual compute and sensor energy over workloads, including thermal behavior and idle periods, and compare the service benefit with that energy cost. Include HVAC, traffic, weather, degradation and required margins in the real fleet model. Battery and vehicle safety evaluation requires qualified engineering; the arithmetic is a bounded accounting exercise.