11kW vs. 22kW Home Charging for BYD

What Your Car Can Really Use – and What Actually Makes Sense in Germany

Buying a home charger for your BYD should be a rational decision, not a guessing game.
Yet many owners in Germany are upsold to 22kW wallboxes without being told one crucial fact:

Most BYD models cannot use 22kW AC charging at home.

This guide explains the real differences between 11kW and 22kW charging, how BYD onboard chargers work, and which option makes the most technical and economic sense for German households.

How Home Charging Actually Works (AC vs. DC)

At home, your BYD charges using AC (Alternating Current).
The wallbox itself does not charge the battery directly — it only supplies power.

The onboard charger inside the car converts AC into DC for the battery.
This onboard charger has a fixed maximum capacity, and it is the real bottleneck.

Bigger wallbox ≠ faster charging
The car always decides how much power it accepts.

BYD Onboard Charger Limits (The Key Fact)

For most BYD models sold in Germany and Europe:

BYD Model	Max AC Charging Power
BYD Atto 3	11kW
BYD Dolphin	11kW
BYD Seal	11kW
BYD Seal U	11kW

This means:

An 11kW wallbox fully matches the car
A 22kW wallbox provides no speed advantage

The extra power simply isn’t used.

Charging Time Comparison (Realistic Example)

Let’s take a typical BYD battery (~60 kWh usable):

Charger	Power Used by Car	Time (0–100%)
11kW Wallbox	11kW	~5.5–6 hours
22kW Wallbox	11kW (limited by car)	~5.5–6 hours

Result:
No difference in charging time.

“But What About Future-Proofing?”

This is the most common argument for 22kW chargers — and often the most misunderstood.

Reality check:

22kW wallboxes require:
- Three-phase power
- Higher installation cost
- In many regions: DSO approval
Future cars with true 22kW AC onboard chargers are still rare
DC fast charging happens outside the home, not in garages