Audi Q5 TFSI e confusion about single-phase 32A charging

Single-phase 32 A vs three-phase: what "32 A" actually means for the Audi Q5 TFSI e

The label "32 A" sounds powerful and it is high current, but on its own it does not tell you how fast a car charges. For the Q5 TFSI e in particular, this number is often misread as fast-charging when it really just describes a strong single-phase home setup.

The plain-English version

Think of charging power as voltage x current x phases. In everyday European terms:

  • Single-phase 32 A ≈ 230 V x 32 A = roughly 7.4 kW.
  • Three-phase 32 A ≈ 400 V x 32 A x √3 = roughly 22 kW.

Same current rating, very different real-world power, because three-phase uses three live conductors at once.

The Q5 TFSI e is a single-phase car. Its on-board charger goes up to about 7.2 to 7.4 kW at 32 A on AC. If you plug it into a 22 kW three-phase wallbox, the car will use one phase and charge at 7.4 kW. The other two phases sit idle. That is not a bug, it is the car's hardware.

What this means in practice

  1. "32 A" on its own is not fast charging. It is fast home charging.
  2. A three-phase wallbox does not speed up this car. Three-phase only helps cars whose on-board charger can use three phases, which the Q5 TFSI e cannot.
  3. For day-to-day home use, single-phase 32 A is the sweet spot. It is the most this car can take, and it is enough to refill the small PHEV pack overnight comfortably.

A common terminology mix-up

A quick reminder, because it trips owners up regularly:

  • Volt (V) is electrical pressure.
  • Ampere (A) is the rate of current flow.
  • Watt (W) is power, the product of the two.

Also: three-phase wallboxes use AC, not DC. Public DC fast chargers are a different category entirely, and the Q5 TFSI e cannot use them at all because its inlet has no DC pins.

Picking the right cable

For a single-phase 32 A car, the right cable is Type 2 to Type 2, single-phase, 32 A. A three-phase 22 kW cable will work but is heavier and pricier without unlocking speed. The Voldt Type 2 cable for the Audi Q5 TFSI e is built for exactly this profile.

Bottom line

For the Q5 TFSI e, "32 A" means single-phase 7.4 kW. That is the real ceiling. Three-phase chargers are useful, but not for this car.