AC versus DC charging
Where the conversion happens, and why that changes everything.
You'll learn
- Explain ac versus dc charging clearly and accurately
- Read the numbers that define the behaviour
- Apply the idea to a real charging session
Overview
Batteries only accept DC. The only real question is whether the conversion happens inside your car or inside the charger.
In depth
AC charging
DC charging
AC vs DC
- On-board charger in the carConversion locationRectifier in the post
- 3.7–22 kWTypical power50–400 kW
- LowHardware costVery high
- Home, work, overnightBest forLong journeys
- LowBattery stressHigher
Where the rectifier sits
1
Grid
2
Charger
3
OBC / DC
4
Battery
Key takeaways
Remember this
- Cells always take DC.
- AC charging is limited by the car's on-board charger.
- DC charging moves the conversion into the post.
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