This estimator compares vehicle range with and without a selected regenerative braking contribution. It calculates how much driving range would be lost if recovered braking energy were unavailable or reduced. The result helps route planners and EV users quantify the value of regeneration for urban, hilly, or stop-and-go operation.
The estimate uses average energy consumption and a fixed recovery percentage. Real range changes with speed, elevation, temperature, traffic, tire condition, and battery limits.
1. Enter usable energy
Use the battery energy available for driving rather than the nameplate capacity.
2. Add base consumption
Enter energy use per mile before crediting regenerative recovery.
3. Estimate braking energy share
Specify how much traction energy is associated with recoverable deceleration.
4. Apply system efficiency
Enter the fraction of that braking energy returned to the battery.
5. Compare ranges
Review range with regeneration, range without it, and the difference.
Recovery fraction = Braking energy share × Regeneration efficiency
Effective consumption with regeneration = Base consumption × (1 − Recovery fraction)
Range loss without regeneration = Battery ÷ Effective consumption − Battery ÷ Base consumption
The model treats recovered energy as a proportional reduction in net trip consumption. It assumes the same route and operating conditions in both scenarios.
The primary result is estimated range lost without regeneration based on the values entered above.
Use the result as a scenario estimate. Validate material assumptions with operational data, technical documentation, or qualified advisers as appropriate.
Given:
75 kWh usable battery, 0.30 kWh/mi base consumption, 20% braking share, and 70% regeneration efficiency.
Calculation:
Recovery fraction = 0.20 × 0.70 = 0.14. Effective consumption = 0.30 × 0.86 = 0.258 kWh/mi. Range with regeneration = 75 ÷ 0.258 = 290.7 miles. Range without regeneration = 75 ÷ 0.30 = 250.0 miles.
Result:
Estimated range lost without regeneration: 40.7 miles.
Interpretation:
Under these assumptions, regeneration contributes about 14% of usable trip energy and materially extends range.
The entered base consumption is treated as pre-recovery traction demand. Recovered energy reduces the net energy removed from the battery.
Convert to kilowatt-hours per mile by dividing Wh/mi by 1,000.
It is already reflected only to the extent that it is included in the base consumption value.
Braking share is usually lower, so the estimated range benefit from regeneration will also be lower.
No. Low-speed braking, emergency braking, traction limits, and battery constraints can force friction braking.