A charger advertised as 150 kW and a receipt showing 25 kWh are describing different things. The first is a power rating. The second is an amount of energy delivered during a session. Comparing the two numbers directly cannot tell you whether the car charged slowly.
kW tells you the rate, kWh tells you the amount
Think of kW as the speed of filling a tank and kWh as how much went in. If a session delivers 20 kWh over 30 minutes, its average power is 40 kW. That is a worked example, not a target for your car. A brief peak on the screen may be much higher than the session average.
Use the same start and finish times for both figures. A receipt that includes time spent connected after charging stopped can make an average look lower. Battery percentage is another measurement again, so include the percentage change without treating it as a direct reading of kWh.
The charger rating is not a promised session speed
The Department for Transport explains charger power bands. A rating describes the equipment; actual delivery also depends on the vehicle and charging conditions. One low reading is not enough to identify an on-board charger or battery fault.
Send the original figures
- The vehicle model and whether the session used AC or DC charging.
- A screenshot or receipt with the units visible, plus the charger location and connector number.
- Start and finish times, energy delivered in kWh and any recorded power in kW.
- Starting and finishing battery percentage, together with the exact vehicle and charger messages.
- Whether charging was slow throughout, stopped unexpectedly or never began.
For a billing or meter discrepancy, ask the chargepoint operator for its session record. For a recurring vehicle warning or charging failure, send AXION the details so we can discuss the next assessment. Please arrange a visit before travelling.