Estimate how long electric delivery van charging will take from the planned starting charge to the target charge. The calculation converts the required battery energy into grid-side charging time using effective charger power and efficiency, then adds connection overhead. Use it to plan vehicle turnaround and depot schedules without assuming the charger always delivers its nameplate rating.
The main result is total elapsed charging time across the entered sessions. It combines energy-transfer time with fixed stop or connection time.
Charging curves are nonlinear. Use average derating to represent taper, vehicle limits, temperature, and shared-site power.
With 110 kWh, 20% to 90%, 75 kW, 92% efficiency, 10% derating, and one 5-minute connection, the required battery energy is 77 kWh and total time is about 79.4 minutes.
The estimate applies charger efficiency and, where entered, adds fixed connection or stop overhead. Real charging can also taper near a high state of charge.
The power derating input represents the average reduction from the charger rating, including taper, temperature limits, and vehicle limits.
Enter the lower effective power available to the vehicle. A charger rating above the van or car limit does not increase delivered power.
Use the starting and target state of charge actually planned. A reserve that remains in the battery is therefore excluded from required charging energy.
Use the number of charging sessions and the average connection overhead per session; the energy portion is calculated for the total state-of-charge increase.
| Input | Purpose |
|---|---|
| Usable battery capacity | Enter in kWh |
| Starting state of charge | Enter in % |
| Target state of charge | Enter in % |
| Average charger power | Enter in kW |
| Charging efficiency | Enter in % |
| Average power derating | Enter in % |
| Charging sessions | Enter in stops |
| Overhead per session | Enter in min |