https://www.siliconvalley.com/2022/10/02/green-rides-reducing-the-cost-of-problematic-ev-charger-installations/

As more and more consumers purchase electric vehicles, many are discovering the significant benefits of home charging. Fueling an EV at a public charging station continues to be slower than filling a tank with gasoline, but the convenience and low cost of home charging greatly outweigh this relatively infrequent drawback. These advantages are increasing because state-of-the-art EVs are now traveling much greater distances on a single charge, reducing the frequency of visits to public charging stations during longer excursions. Improving widespread access to home charging is emerging as a key prerequisite to full-scale EV adoption, and promising new technologies are being developed to overcome barriers.

In most cases, homeowners are able to install rapid Level 2 home chargers that can fully refuel an EV overnight, when electricity rates are low. The cost of the installation is minor compared to the purchase price of the EV and is rightly seen as an indispensable investment. In some cases, however, a homeowner’s existing electrical panel is already near its full capacity, and upgrading the panel to handle the additional load of an EV charger is prohibitively expensive. The technical barrier is frustrating because an EV charger will only trigger a capacity shortfall when other major appliances are in use, but this is rarely a problem when operating at night. There are also situations where an existing electrical subpanel has additional capacity but doesn’t have any remaining spaces for a circuit breaker dedicated to an EV charger.