Surprise-surprise

[ny_quant]

A new AAA study finds that when the thermometer dropped to 20 degrees Fahrenheit, range fell by an average of 41 percent on the five models it tested… Some EV drivers recently found that range can drop by half when the mercury tumbles into negative territory.

https://www.cnbc.com/2019/02/06/aaa-confirms-what-tesla-bmw-nissan-ev-owners-suspected-of-cold-weather.html

Comments

[agasfer.livejournal.com]

DoE оценивает ежегодный перерасход топлива из-за езды на недонакачанных шинах в более, чем миллиард галлонов. Поскольку зимой народу влом докачивать, половина машин ездит на спущенных шинах и перерасходует бензин. Для электрических эффект должен быть таким же. Кстати, поскольку на холоду резина жестче, расход энергии на трение в покрышках зимой больше.

Вот и еще одна причина.

[misha-b.livejournal.com]

That's a good point. When it is cold the pressure in the tires is lower and few people are going to bother pumping them up. In fact, if you drive long enough the tires will warm up from friction and the air pressure goes up significantly improving your range.

[agasfer.livejournal.com]

Hence, for fair comparison, tire pressure must be the same for all vehicles involved both in summer and in winter.

[misha-b.livejournal.com]

Yes, that shows why accurate comparisons are tricky.

[agasfer.livejournal.com]

One more consideration, completely unaccounted for so far, is that in the cold it takes less energy to recharge the battery. To simplify the model, when the battery is charged, the energy is used to convert chemical A into chemical B (there are several chemicals involved, of course, but just to make it simple); then this energy is discharged into electric current when B converts back to A. If the battery is cold, you still have the same amount of chemical B in the battery, meaning, you have the same amount of energy stored. So why it gives back less energy in winter?

The reason is, if in the summertime the battery is discharged to 100% A and 0% B (ideally), in the cold it stops working at about, say, 75% A and 25% B. So, if you warm up the battery, it can go on discharging to 0% B, but in the cold it just stops working when not completely discharged. However, this also means you need to convert only 75% A back into B, not 100% A, when you recharge the battery again.

Thus, in the wintertime you have to recharge the battery more often but every time you are recharging you use less energy. This leaves the same reasons to use more energy in winter as with the combustion engine vehicles.

[affidavid.livejournal.com]

Зимой стоит держать давление в покрышках пониже из-за снега и льда. Докачивать не стоит.

[agasfer.livejournal.com]

Едва ли это чем-то поможет, только ускорите износ. Лучше менять резину на зимнюю.