Technical guide
How to size charging power for an electric fleet.
A practical introduction to daily energy, concurrency, dwell time and transformer capacity.
Imagine 20 delivery vans returning between 18:00 and 22:00. Each needs 40 kWh before the morning route, so 800 kWh must be delivered. An eight-hour average of 100 kW is only a first check; late arrivals, charger losses, tapered vehicle curves and a shared transformer can require a different topology.
Project boundary
Imagine 20 delivery vans returning between 18:00 and 22:00. Each needs 40 kWh before the morning route, so 800 kWh must be delivered. An eight-hour average of 100 kW is only a first check; late arrivals, charger losses, tapered vehicle curves and a shared transformer can require a different topology.
Decision method
Create a time-bucket schedule for each vehicle: arrival, departure, energy deficit and maximum accepted power. Sum simultaneous demand for each interval, cap it by available site power and test whether all departure targets remain feasible. If not, compare staggered charging, longer windows, operational changes or a grid upgrade rather than simply increasing nameplate charger power.
Required output
The deliverable is a vehicle-level energy schedule, site peak-demand estimate, charger/outlet configuration and sensitivity case for late arrival or higher energy use. State which values are measured and which remain assumptions.
What this decision should produce.
- The deliverable is a vehicle-level energy schedule, site peak-demand estimate, charger/outlet configuration and sensitivity case for late arrival or higher energy use. State which values are measured and which remain assumptions.
YOUR QUESTIONS, ANSWERED
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Practical answers about Power sizing. No guesswork.
Ask about your project4 questions
01How do I estimate average charging power?
Divide required delivered energy in kWh by the available hours. Add appropriate allowance for losses and operating conditions, then validate individual vehicles and simultaneous demand.
02Is average power the same as installed charger capacity?
No. Departure overlap, vehicle curves, redundancy needs and allocation rules can require a different installed capacity. An average is a starting calculation, not an equipment schedule.
03Should building loads be subtracted from available power?
They must be included in the site capacity assessment. Use measured or justified demand assumptions and verify how charging limits respond to changing building load.
04Which data improves an initial sizing estimate?
Vehicle energy use, arrival/departure times, target state of charge, measured site loads and planned fleet growth provide a stronger basis than charger count alone.
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