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Average CAC drop for a winter

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marco2228

... fixing Roadsters
Supporting Member
There are several posts, where TMC members wrote about a CAC drop in the winter. But I never found any numbers.
Since this is my first winter with the Roadster it would be good to know some numbers, what I can expectant don't have to worry about.

time frame: 1.5 month
approx. temp difference in the CAC decrease time frame: 15 - 20 K
lowest temp: -5 °C
CAC decrease: 2.5 Ah

Would be great to collect some data sets (of these four values) of other Roadsters.

Thanks,
Marco
 
My experience has been a bit different than others. Here are some numbers for our car from last winter. The car is garaged at about 10C overnight and days when it isn't driven. Driving temps in the winter are generally well below 0C.

DATE CAC. ODO S.miles/R.miles
10/05/13 156.55 17408
10/17/13 157.01 17810
10/25/13 157.77 17849
10/31/13 158.06 18111
11/12/13 158.74 18473
1/19/14 159.39 18726
1/22/14 159.39 18855 258
2/24/14 159.27 19072
2/26/14 159.41 19089 254
3/3/14 159.45 19326
3/9/14 159.71 19345 254
3/31/14 159.70 19954
4/24/14 158.52 20105 246
4/29/14 156.75 20327
6/8/14 155.76 21239 187

Sorry my Excel spreadsheet didn't copy very well
 
Last edited:
Yes. It went up. At least last winter. I don't have data for the previous year. Some local factors that might effect our situation:

It is seldom hot in Alaska. Rarely over 25C.
A typical week is:
Charge to full in standard. Drive 110 mile commute. Charge to 50%. Three days later charge to full in range mode. Return 110 miles commute. Four days later charge to full in standard. And so on. Car spends a lot of time around 50% SOC.

The battery does seem to be in excellent condition. Unfortunately the car currently has a few other problems :(