Tesla's official charging rates are estimates, but I think they make NEMA 5-15 charging seem really bad (3 miles/hour for a model 3?).
I've plugged some data into a spreadsheet to calculate charging times for various volts and amps.
Bold efficiencies are from the tesla forums; the other values are guesses.
Charge rate can of course vary based on ambient; it can even be too cold to charge at all with a lower-powered charger.
Here are my values compared to tesla's posted numbers:
The times I've calculated differ drastically from the official times, particularly over 5-15 and 5-20.
What sort of charging times are you all seeing in practice?
I've plugged some data into a spreadsheet to calculate charging times for various volts and amps.
volts | amps (continuous) | kW | efficiency | kW actual | hours to charge 75kWh | hours to charge 70% | % added in 10h | miles/hr at 300Wh/mile | cost to charge 75kWh at 12 cents/kWh |
120 | 12 | 1.44 | 85.40% | 1.22976 | 60.0h | 42.5h | 16% | 4.392 | $10.54 |
120 | 15 | 1.8 | 87% | 1.566 | 47.8h | 33.7h | 21% | 5.22 | $10.34 |
120 | 24 | 2.88 | 89% | 2.5632 | 29.1h | 20.0h | 34% | 8.544 | $10.11 |
240 | 12 | 2.88 | 93.60% | 2.69568 | 27.3h | 19.2h | 36% | 8.9856 | $9.62 |
240 | 15 | 3.6 | 94% | 3.3732 | 22.2h | 15.1h | 45% | 11.28 | $9.57 |
240 | 24 | 5.76 | 93.90% | 5.40864 | 13.1h | 9.1h | 72% | 18.0288 | $9.58 |
240 | 32 | 7.68 | 95.60% | 7.34208 | 10.3h | 7.0h | 98% | 24.4736 | $9.41 |
240 | 40 | 9.6 | 94% | 9.024 | 8.2h | 5.1h | 120% | 30.08 | $9.57 |
240 | 48 | 11.52 | 93% | 10.7136 | 7.6h | 4.1h | 143% | 35.712 | $9.68 |
Bold efficiencies are from the tesla forums; the other values are guesses.
Charge rate can of course vary based on ambient; it can even be too cold to charge at all with a lower-powered charger.
Here are my values compared to tesla's posted numbers:
Adapter | Amps (continuous) | max mileage gained per hour | 326/max mileage | my calculation | excess time |
5-15 | 12 | 3 | 103.0h | 60.0h | 42.0h |
5-20 | 15 | 4 | 81.0h | 47.8h | 33.2h |
6-15 | 12 | 10 | 32.0h | 27.3h | 4.7h |
6-20 | 15 | 14 | 23.6h | 22.2h | 1.3h |
10-30 | 24 | 21 | 15.7h | 13.1h | 1.6h |
14-30 | 24 | 21 | 15.7h | 13.1h | 1.6h |
14-50 (MC) | 32 | 29 | 11.0h | 10.3h | 1.6h |
6-50 (MC) | 32 | 29 | 11.0h | 10.3h | 1.6h |
wall/6-50/14-50 | 40 | 36 | 9.0h | 8.2h | 0.8h |
wall | 50 | 42 | 7.9h | 7.6h | 0.2h |
The times I've calculated differ drastically from the official times, particularly over 5-15 and 5-20.
What sort of charging times are you all seeing in practice?