I think most people will be fine with a 220 volt 30 amp charger at home. 42kWh pack (160 mile range) = about 7 hours 70kWh pack (230 mile range) = about 12 hours So even with the 70 kWh battery you will start each day with a full battery using an outlet that any home electrician can install easily. I have read on the Tesla owners website that many owners are getting bills for several thousand dollar to upgrade their garages to handle the 70 amp HPC. For Tesla Roadster owners, that is not a big deal. But if EVs are going more mainstream, home charging is going to be limited to that of a standard dryer at 220 volt 30 amps. I am not sure which battery I would select. It depends on if the extra weight significantly degrades performance. I think I would be fine with the 160 miles range at 42 kWh.