What should you take from this guide
- Battery capacity of the vehicle
- Initial and objective percentage
- Car AC limit
- Real power available and losses
Time depends on the missing energy and the lowest limit of the entire chain.
Read the process from left to right. Each step must be resolved before turning the choice into a purchase.
The useful formula
Energy to recover = battery capacity × percentage difference. Then, the approximate time is the energy taken from the network divided by the effective power.
The effective power shall be at most the least between wallbox, internal car charger and installation. The losses increase the energy requested to the network.
Why the last section can change
The vehicle controls the load and can reduce power according to temperature, battery status or strategy of the manufacturer. Therefore the figure is an estimate, not a promise of duration.
How to make an estimate that will serve
First, it calculates the difference between the initial and the final percentage. Apply that percentage to the battery capacity prevents estimating a complete recharge when you only need to recover a part.
Then add a loss margin and divide by the effective power, not by the highest number of the charger. Repeat the calculation with a favourable scenario and another conservative to know a reasonable interval.
Checklist before continuing
- Battery capacity of the vehicle
- Initial and objective percentage
- Car AC limit
- Real power available and losses
Make the guide a decision.
Enter battery, percentage, power, rate and household consumption. Calculations run on your browser and do not require registration.
Limits and security
The results and explanations are indicative. They do not constitute an electrical project, compatibility certification or assembly instruction. The installation must be reviewed by a professional who is qualified in accordance with the applicable rules and the manufacturer's instructions.
