Audi charges slower than expected

Audi charges slower than expected: how to tell a real problem from physics

Most "slow charging" complaints aren't actually faults. They're a gap between what an Audi could draw on paper and what it's allowed to draw given the car's onboard charger, the station's output, and the wiring between them. Once you understand those three limits, the picture clears up fast.

What your Audi can actually accept on AC

This is the most common source of confusion:

  • Audi BEVs (e-tron, Q4 e-tron, Q6/Q8 e-tron, e-tron GT): up to 11 kW AC on a three-phase supply. The Q4 35 is capped at 7.2 kW.
  • Audi PHEVs (A3, Q3, Q5, Q7, Q8 TFSI e): Type 2 only, single-phase, 3.6 to 7.4 kW depending on model and market.

No Audi charges faster on AC than its onboard charger allows, even on an 22 kW post. A PHEV on a 22 kW charger draws 3.6 to 7.4 kW. That's not a fault, that's the spec.

What to check before suspecting a fault

  1. Confirm the charger output and your current limit. UK homes are typically single-phase, capped at 32 A (around 7.4 kW). Three-phase is rare outside commercial sites and gives you the full 11 kW on a BEV.
  2. Check the in-car charging current limit. Audi lets you cap charging current per location. A reduced limit set once and forgotten is a very common cause of "slow" sessions.
  3. Check the cable rating. A 16 A single-phase Type 2 lead will throttle a car that could otherwise pull 32 A. If you have a three-phase 11 kW car, you need a three-phase 32 A cable to see full speed. A correctly specced Voldt Audi-compatible Type 2 charging cable matches the car's onboard charger so the cable is never the bottleneck.
  4. Battery temperature and state of charge. A cold pack or a session above ~80% will taper, even on AC. This is normal.
  5. On DC fast charging, peak kW is only held for a short window. Average session speed is always lower than the headline number.

Bottom line

Work out your real ceiling first: car's onboard charger, station output, cable rating, in-car current limit. The slowest of those four is your actual charging speed. In most cases the system is doing exactly what it's specced to do.