EV charging speeds: why '150 kW' rarely means 150 kW at your car
A charger's advertised power is a ceiling, not a promise. What your car actually draws depends on several things at once.
Meridians Travel Desk
Published 11 July 2026 · Updated 11 July 2026 · 6 min read
AutomotiveThe short answer
- A charger''s kilowatt rating is the maximum it can deliver, not the rate any given car will accept.
- Charging speed is limited by the lower of the charger''s output and the car''s onboard acceptance rate.
- Batteries charge fastest in a middle state-of-charge band and slow markedly as they approach full.
- Temperature, battery conditioning and a shared charger cabinet can all reduce the rate you actually get.
Public charging is quoted in big kilowatt numbers, and drivers reasonably expect to receive them. The number is real, but it describes the charger''s ceiling — and several factors sit between that ceiling and your battery.
The slowest link wins
Charging happens at the lower of two limits: how much power the charger can supply, and how much the car is built to accept. A 150 kW charger delivers 150 kW only to a car whose onboard system can take it. Plug in a car that accepts less, and the car''s limit governs — the charger''s rating is irrelevant.
The battery''s own curve
Even a capable car does not hold peak power throughout. Batteries accept the highest rates in a middle band of charge and taper sharply as they fill, to protect the cells. This is why charging from low to around eighty per cent is quick, and the last stretch is disproportionately slow — and why fast-charging to full is usually a waste of time.
Read a charger''s rating as the best case, plan around charging in the fast middle band rather than to full, and the gap between the advertised number and your experience stops being a surprise.
Sources
Every factual claim above is traceable to these documents. Check them — that is why they are here.
- Charging electric vehicles at home and in publicUS Department of Energy — Alternative Fuels Data Center
- Electric vehicle charging infrastructureUS Department of Energy — Alternative Fuels Data Center
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