The answer to 'what size EV charger do I need' is that the size of the EV charger you need will depend on the power requirements of your electric vehicle and your home's electrical system. Generally, a Level 2 EV charger with a 240-volt, 30-amp or 40-amp circuit is recommended for most home installations. This will provide faster charging speeds compared to a standard 120-volt household outlet (Level 1 charger).
The specific size you need will depend on factors like the make and model of your EV, the maximum charging rate it can handle, and the capacity of your home's electrical panel. It's best to consult with a licensed electrician who can assess your home's electrical system and recommend the appropriate EV charger size for your needs.