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> Tesla flunked the test due to cold weather energy loss. This might sound pedantic, but the logs don't actually show any overnight cold-weather energy loss.
by thedufer 14y ago
> Tesla flunked the test due to cold weather energy loss.
This might sound pedantic, but the logs don't actually show any overnight cold-weather energy loss. What they do show is that it costs more energy per mile until the battery heats back up.
This makes a big difference when looking at the expected performance, because it means that it doesn't much matter how long you park it in the cold, only how cold it is when you start driving again.
It looks like energy loss, because the system apparently knows that a low battery temp will cause the batteries to drain faster and compensates in the range estimate.
- lutusp 14y ago> This makes a big difference when looking at the expected performance, because it means that it doesn't much matter how long you park it in the cold, only how cold it is when you start driving again. Yes, unless you try to charge the battery while it's cold -- batteries aren't very efficient at absorbing a charge when they're cold. I'm speaking here about the basic physics, not the metering and software.
- thedufer 14y agoThis NYTimes article has been used as evidence against Tesla's claim that you can leave the car at an airport for a week and come back without having lost (much) charge, regardless of weather conditions. I merely intend to point out that due to an inaccuracy in interpreting the drop in range, this is not evidence against that claim.