jsmay311
Active Member
I think y'all have the wrong take on this. Although the inaccurate time-to-completion estimate is indeed related to the cold, it's not a sufficient excuse for just how dramatically inaccurate the estimate is.
The estimate is still way off even after reaching a steady-state max power charge rate, and even with L2 charging.
For example: I charged my car last night in zero degree (F) temps in my detached garage at 240V 16A. The battery started bone cold (zero regen), so close to worst-case conditions, and yet once the battery was warm it charged at the same speeds I'd see in the summer. But the charge time estimates were still way off.
There's no need to make excuses for Tesla's failure to do this competently.
The estimate is still way off even after reaching a steady-state max power charge rate, and even with L2 charging.
For example: I charged my car last night in zero degree (F) temps in my detached garage at 240V 16A. The battery started bone cold (zero regen), so close to worst-case conditions, and yet once the battery was warm it charged at the same speeds I'd see in the summer. But the charge time estimates were still way off.
- 0 F ambient temps
- 240V, 16A charging
- First 20 minutes of charging session went to heating the battery.
- Once the battery was warm enough for full power to go into charging the battery, the time estimate didn't drop.
- After warming the battery, it estimated 14 hours to completion. It actually took less than 10 hours.
- The % error of the estimate never improved throughout the charge. It actually got worse.
- It started out at ~45% error.
- After 3 hours it was up to ~50%.
- With 2 hours remaining, it was ~60% off.
- With 1 hour remaining, it was off by ~85%
- With only 1 minute from completion, the estimate was 30 minutes.
There's no need to make excuses for Tesla's failure to do this competently.
Last edited: