What should you take from this guide
- Daily kilometres and consumption
- Real hours of charging
- Maximum AC power of the car
- Fases and margin of housing
The best power is that which covers daily use within the time available.
Read the process from left to right. Each step must be resolved before turning the choice into a purchase.
Start with your miles.
Turn your daily miles into kWh by using the vehicle. That energy, with a margin for losses, is the one you normally need to replenish, not the whole battery.
Check the bottle neck
A 22 kW wallbox will not deliver 22 kW to a car limited to 11 kW AC. Nor will it deliver 22 kW in a monofasic installation set up for 7.4 kW.
The power contracted does not determine the viability of the company itself: simultaneous consumption, electrical scheme, protections and dynamic management also intervene.
Dimension from need, not from catalog
Convert the usual kilometers into daily energy using the realistic consumption of the car. Most days will not be necessary to load from scratch, so the decisive data is usually the energy to be replenished during the night.
Cross that result with the parking hours, the vehicle's AC limit and the supply phases. It only makes sense to assess if a larger power provides comfort, future margin or simply cost and complexity.
Checklist before continuing
- Daily kilometres and consumption
- Real hours of charging
- Maximum AC power of the car
- Fases and margin of housing
| Nominal power | Electrical reference | Orientation use |
|---|---|---|
| 3.7 kW | 230 V · 16 A · monophasic | Moderate night recovery |
| 7.4 kW | 230 V · 32 A · monophasic | Faster domestic load if car and installation allow |
| 11 kW | 400 V · 16 A · triphasic | Vehicles with three-phase AC charger |
| 22 kW | 400 V · 32 A · triphasic | It only takes advantage of the whole compatible chain |
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.
