It is the opposite. Jerry33 is right. Larger battery supercharges faster. This has to do with the fact that supercharging slows down at higher percentages (known as tapering curve). In the table below you can see that 200 rated miles equals to 96.15% in 60 kWh battery but only 69.93% in 90 kWh battery. With larger batteries you don't need to supercharge to high percentages to acquire the same rated miles. Therefore it is faster. Here is a comparison between 60,70,85 and 90 kWh batteries supercharging from 30 to 200 rated miles:
Model S 60
| Model S 70D
| Model S 85D
| Model S 90D
|
max 208 miles EPA rated range
| max 240 miles EPA rated range | max 270 miles EPA rated range | max 286 miles EPA rated range |
Step 4: Supercharge From | Step 4: Supercharge From | Step 4: Supercharge From | Step 4: Supercharge From |
30
| 30 | 30 | 30 |
charge level 14.42% | charge level 12.50% | charge level 11.11% | charge level 10.49% |
charge time to this percentage | charge time to this percentage | charge time to this percentage | charge time to this percentage |
06 min 36 sec | 05 min 48 sec | 05 min 12 sec | 04 min 54 sec |
Step 5: Supercharge To | Step 5: Supercharge To | Step 5: Supercharge To | Step 5: Supercharge To |
Enter miles (max 208) | Enter miles (max 240) | Enter miles (max 270) | Enter miles (max 286) |
200
| 200 | 200 | 200 |
|
|
|
|
charge level 96.15% | charge level 83.33% | charge level 74.07% | charge level 69.93% |
charge time to this percentage | charge time to this percentage | charge time to this percentage | charge time to this percentage |
1 hour 19 min 06 sec | 56 min 36 sec | 46 min 18 sec | 42 min 18 sec |
1 hour 12 min 30 sec
| 50 min 48 sec | 41 min 06 sec | 37 min 24 sec |
The data is from this spreadsheet:
Tesla Supercharge Time Calculator - Google Sheets
However, dual chargers is still a good idea because of the destination charging program. Not all destination chargers are at hotels where you stay overnight.