The practical answer
Level 1 can work for short commutes and plug-in hybrids, but it is slow and fragile as a whole-home plan. Level 2 is the normal home charging target because it recovers meaningful range overnight and gives more scheduling flexibility.
Decision path
- Calculate daily miles instead of focusing on full-battery charge time.
- Use Level 1 as a bridge if your commute is short and the outlet is safe.
- Move to Level 2 when you need predictable overnight recovery.
- Pick amperage based on circuit capacity and vehicle limits.