Public EV Charger Battery Degradation Calculator

1. Enter usable battery capacity
Use the battery energy available to the driver.

2. Add annual public-charging energy
Estimate energy received from public chargers each year.

3. Set the analysis period
Enter the number of years to model.

4. Enter average charging power
Use session-average power, not only the charger’s peak rating.

5. Set the usual charge target
Higher targets can increase the model’s stress factor.

6. Review remaining capacity
Use the estimate for scenario comparison, not diagnosis.

Equivalent full cycles = Annual public charging energy × Years ÷ Battery capacity
Base degradation = Equivalent full cycles × 0.022%
Power factor = 1 + max(0, Average power − 50 kW) ÷ 500
State-of-charge factor = 1 + max(0, Charge target − 80%) × 0.02
Estimated degradation = Base degradation × Power factor × State-of-charge factor

What the result means

The result estimates the percentage of original usable capacity lost under the entered public-charging pattern.

The coefficients are a planning model and are not calibrated to a specific vehicle.

Given: 82 kWh battery, 6,000 kWh public charging per year, 5 years, 110 kW average power, and an 85% target.

Calculation: Equivalent cycles = 6,000 × 5 ÷ 82 = 365.85. Base degradation = 365.85 × 0.022% = 8.05%. Power factor = 1 + (110 − 50) ÷ 500 = 1.12. State-of-charge factor = 1 + 5 × 0.02 = 1.10. Estimated degradation = 8.05% × 1.12 × 1.10 = 9.92%.

Result: Lost capacity = 82 × 0.0992 = 8.13 kWh; remaining capacity = 73.87 kWh.

This estimate isolates the modeled public-charging contribution and does not separately add calendar aging.