Calculate DC fast charging power curve, time to charge, and peak vs average charge rates at different SOC levels.
Input Parameters
Results
--
Avg Charge Rate
kW
--
Charge Time
minutes
--
Energy Added
kWh
--
Est. Miles Added
mi
Note: DC fast charging tapers significantly above 50% SOC to protect battery chemistry. A 250 kW charger might average only 150 kW from 10-80%. Charging 80-100% can take as long as 10-80%.
Reference
Charge curve simulation (1% SOC steps):
SOC < 50%: Power = Max Rate
SOC 50-80%: Power = Max × (1 − 0.8 × (SOC−50)/30)
SOC > 80%: Power = Max × 0.20
Time per step = Energy step / Power × 60
Avg Rate = Total Energy / Total Time