DC fast charging delivers direct current straight to an EV's battery, skipping the vehicle's onboard AC-to-DC converter that limits how fast a normal charger can go. That's the whole difference, and it's why DC chargers can add range in minutes instead of hours.
Where the Conversion Happens
Every EV battery stores energy as DC. A standard AC charger sends alternating current to the car, where the vehicle's own onboard charger, limited to a few kW to a few tens of kW, converts it to DC. A DC fast charger does that conversion itself, in the charging unit, and can be built much larger than anything that fits inside a car, which is why DC charging reaches far higher power: commonly 50 kW to 400 kW, and up to 1.6 MW for the largest depot and HGV installations.
What "Fast" Actually Means
| Tier | Typical power | Common use |
|---|---|---|
| DC fast / rapid | 50–150 kW | Public charging, smaller depots |
| Ultra-rapid | 150–400 kW | Cars, vans, larger fleet depots |
| Megawatt charging | 800 kW–1.6 MW | HGV and bus depots |
Why Depots Choose DC Over AC
For a fleet with a tight charging window between shifts, AC charging simply can't deliver enough energy fast enough. See kW vs kWh for how power rating translates into actual charge time. DC fast charging is what makes overnight and opportunity charging viable for buses, HGVs, and high-utilisation vans.
Neutron's DC Charging Range
Our DC Fast Chargers and DC Terminals cover the full range from public-facing rapid charging to megawatt-scale depot charging, all running on dynamically balanced shared power.
Does DC fast charging damage EV batteries?
Occasional DC fast charging has minimal impact on modern EV batteries, which include thermal and charge management systems designed for it. Very frequent, back-to-back fast charging can accelerate degradation slightly faster than AC charging, which is why depot fleets often mix overnight AC or lower-power DC charging with fast charging only where the duty cycle needs it.
What's the difference between DC fast charging and rapid charging?
They're generally the same thing, though "rapid" in the UK sometimes refers specifically to 43-50 kW chargers, with "ultra-rapid" used for 100 kW and above. All are DC charging, distinguished from AC charging by where the AC-to-DC conversion happens: in the charger rather than the vehicle.
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