An advertised charging peak describes a maximum under specified conditions. Average session power describes energy transferred divided by elapsed time. The second figure is more useful when you want to understand a charging stop, provided the start, finish and measurement boundary are stated.
Tesla’s Model 3 manual documents real-time charging information for the vehicle. Use the manufacturer’s session information and guidance to interpret how charging power varies over the interval.
A fair session comparison gives the starting point, finishing point and elapsed time together. With those details visible, an average can be interpreted in context. The peak figure can then be read as another characteristic of the session, alongside the interval being compared.
Compare equal intervals
Write down the starting charge, finishing charge, battery variant and relevant conditions. A session ending near full is not directly comparable with one that ends much earlier. Nor does the same percentage interval necessarily represent the same energy in different batteries.
This is a method for reading specifications and published results. It is not a road test and supplies no measured ranking of cars.
Calculate an average honestly
In a hypothetical example, a charger records 30 kWh over half an hour. At that measurement boundary, the average is:
30 kWh ÷ 0.5 hours = 60 kW
That remains the session average even if the display briefly showed a higher number. Keep the measurement boundary attached to each energy figure, including charger-delivered and battery-stored energy.
Ask for the useful comparison
| Published figure | Follow-up question |
|---|---|
| Maximum charging power | Under what stated conditions? |
| Charging time | Between which charge levels? |
| Energy added | Measured where? |
| Distance recovered | Based on which consumption assumption? |
For a travel decision, compare documented charging time over the interval you expect to use. List any missing session information beside the estimate so the calculation can be updated when it is available.
Compare two invented sessions
Imagine two sessions adding the same 30 kWh at the same measurement boundary. One takes 20 minutes and the other 30 minutes. Their averages are 90 kW and 60 kW respectively, calculated by converting each duration to hours first.
A peak reading alone cannot supply those averages. The session record needs the energy amount and the time interval. To compare vehicles meaningfully, the starting and finishing charge conditions and relevant operating circumstances also need to be stated.
Choose the comparison for the question
If planning a journey, record the time needed to add the energy required for the next leg under the vehicle’s applicable guidance. If comparing a published charging claim, identify its stated charge interval and test conditions. These are related questions with different evidence needs.
A working session log can contain date, vehicle version, starting and ending charge, recorded energy, charging duration and any known conditions. Keep queue, setup and other stop time in separate fields. This allows both a charging-power calculation and a complete-stop comparison.
When a result differs from a published example, begin with those fields. A changed interval or measurement boundary may explain part of the difference; other questions may need the vehicle or charger’s documentation. The log gives that enquiry a concrete starting point.
For example, an invented session delivering 24 kWh over half an hour averages 48 kW. Add queue and setup time separately when planning the complete stop. Keeping charging time and total stop time side by side makes the estimate more useful for the journey.
Sources consulted
- Charging Instructions: Model 3 — Tesla; consulted 3 November 2026.
- Federal Workplace Charging Program Guide — U.S. Department of Energy; consulted 3 November 2026.