The practical answer
Your charger needs enough amps to recover your normal daily driving before the next trip. For many homes, 24A to 40A Level 2 charging is plenty. A 48A hardwired setup is useful for faster recovery and future flexibility, but it is not the default requirement.
Decision path
- Estimate daily miles and overnight parking hours.
- Translate charger output into approximate miles recovered per hour for your vehicle.
- Avoid designing around rare edge cases unless they matter often.
- Let panel capacity and install cost shape the final amperage.
