Level 1
110v
4
Can use home plugs but a dedicated charger is recommended for regular use
Level 2
208v/240v
32
U.S. homes support 240v but typical service (100a or 200a) is inadequate for modern chargers (e.g., Ford Lightning 80A) and existing home loads (e.g., AC).
Level 3
400v to 900v
200
Requires significant grid engineering and collaboration with local utilities and expense