I'm mostly worried about a "perfect crap storm" of:
- cold snap
- drag the car home at 10:00 at night with 15% battery and wicked cranky kids
- don't plug it in while the battery is still warm
- plug it in the next morning when the car is covered with ice, has 10 miles of range, and the battery is cold soaked
If the 3.8kwh charger is sufficiently powerful to warm up the battery and possibly the cabin and even add a couple miles per hour after being plugged in for 45 minutes, I'll call that circuit "good enough"
It is certainly more than good enough to charge my car "overnight" in normal usage, even if I let the car go down to 10%, but that's not fighting a deeply cold soaked battery outside in terrible weather.
But, given that I'm in between the 3 superchargers in town, the one in Dedham (that's always busy with service center cars) and the one being built in Chestnut Hill and I've got a 6kwh charger at work, I think I'm pretty much covered for charging needs.