Yes, you have to charge to fit your schedule of course and with your job you do have to be ready at a moments notice. I'm following this charge at the latest possible time from a tip that was provided from a Tesla engineer. The mail is buried somewhere here on TMC. And that practice is typically general for any lithium battery really where you don't leave the battery sit at a higher CAC then needed. But don't get too worried, I'm pretty anal when it comes to my ESS and taking care of it. Kind of a long term experiment. The high end of the std. mode charge SOC is still in the area where it does not stress the battery too much, I'm just trying to wring out as much life out of it as I can and see where it goes.
As for raising your CAC, its really experimental. Note that I have not range mode charged in a year and won't do it unless I really really need it. I know that 90-100% SOC and 0-15% SOC can be stress on the pack. I also try to keep my SOC sitting at around 55-65% over the weekends or when the Roadster is not in use. And I try not to punch the accelerator too hard when I'm below 50% SOC. Odd thing is that the Zero motorcycles really are set to abuse their batteries and they're holding up well. Constantly at 100% and 0-10% SOC, they have no thermal cooling so they heat up, they get hammered for amps below 50%, etc, etc. I'm not seeing anyone complain about a huge loss of capacity, so that's pretty wild. I do believe that the Roadster's cell chemistry is more delicate than Zero's current chemistry. And that's why I'm a little depressed that we can't upgrade our 1.5's to the 3.0 battery. I don't care about the extra range, what I want is a more durable battery chemistry.
So back on track... I saw my CAC dive as I mentioned in other posts, it dove from 153 and kept going down where it reached 146. My job location changed where I had access to the Chargepoint chargers. So when I moved to that location I started doing cool-downs whenever I arrived at work, 220v@16amps. Sometimes I'll do 12amps on cool-downs, but feel that the 16amps covers the HVAC overhead better. And when I get home from work, I do a cool-down. Don't have any real data other than my own observation and personal charge/cool-down algorithm I created, but seeing promising results. Is it the trickle charge at lower amps? The cool-down in the morning and evening? Or both? I really don't know, but they appear to be a positive input for the ESS. Staying with the consistent cool-down protocol above, mostly cooling at work, I started seeing my CAC slowly creep up. Then after the creep, the climbs became bigger. I'm at 153.63 CAC now and its still going up, so we'll see where it goes.
Looking at my logs I discovered brick #75 & #90 were the weakest brick during the low CAC time. They'd rotate out with one another, so everything was normal and appeared to possibly be something weak going on in those cells. Also, the avg. CAC is really high for my pack except for those two bricks. So somehow I possibly managed to break a cell(s) degradation path for the time-being. All I know is that I found a behavior I'm doing to the Roadster that's in-turn providing a positive result to the pack. So I'll continue to do that behavior. Also seeing that the CAC dropped like a rock, I'll be more delicate to the pack. Such as not taking the Roadster on trips where there are really high temps. I know that the pavement on 280/92 where you live can feel like the surface of the sun. Whenever I drive in hot road conditions like that, I really want to for sure drive the battery temps down and not allow it to hot-bathe for too long of a duration.
Truth is every pack has its own character and quirks. You have to do something, watch your CAC and either stop or keep doing that thing depending on what direction your going. Its all about data really and what / how to process it.
Here's a link showing how people have observed the Roadster's CAC going up and down:
Tesla Motors Club - Enthusiasts & Owners Forum
Below is a capture from my VMSparser -b call where it was @ 146 and showing the climb. Also you can see that the avg CAC of the bricks is 157.22 and lowest brick is 153.29. CAC in diags always reports a little higher for some reason, where it says 153.63:
timestamp, brickahmin, brickahave, bricknumber
...
05/20/2015 00:49:27, 146.79, 150.61, 75
05/21/2015 00:49:27, 146.91, 150.50, 75
05/22/2015 00:49:27, 146.85, 150.38, 75
05/23/2015 00:49:28, 146.51, 150.16, 75
05/24/2015 00:49:27, 146.51, 150.16, 75
05/25/2015 00:49:28, 146.51, 150.16, 75
05/26/2015 00:49:27, 146.51, 150.16, 75
05/27/2015 00:49:27, 146.39, 149.98, 75
05/28/2015 00:49:28, 146.28, 150.04, 75
05/29/2015 00:49:27, 146.51, 150.16, 75
05/30/2015 00:49:28, 146.51, 150.16, 75
05/31/2015 00:49:28, 146.51, 150.16, 75
06/01/2015 00:49:28, 146.51, 150.16, 75
06/02/2015 00:49:28, 146.68, 150.27, 75
06/03/2015 00:49:28, 146.91, 150.38, 75
06/04/2015 00:49:27, 147.19, 150.50, 75
06/05/2015 00:49:28, 147.36, 150.67, 75
06/06/2015 00:49:29, 147.59, 150.73, 75
06/07/2015 00:49:29, 147.59, 150.73, 75
06/08/2015 00:49:28, 147.59, 150.73, 75
06/09/2015 00:49:29, 147.76, 150.90, 75
06/10/2015 00:49:29, 148.27, 151.35, 75
06/11/2015 00:49:30, 148.62, 151.70, 75
06/12/2015 00:49:30, 148.62, 151.75, 75
06/13/2015 00:49:30, 148.79, 151.87, 75
06/14/2015 00:49:30, 148.79, 151.87, 75
06/15/2015 00:49:30, 148.79, 151.87, 75
06/16/2015 00:49:30, 148.50, 151.52, 75
06/17/2015 00:49:30, 148.39, 151.35, 75
06/18/2015 12:11:55, 148.45, 151.18, 75
06/19/2015 12:11:55, 148.67, 151.41, 75
06/20/2015 12:11:55, 148.73, 151.52, 75
06/21/2015 12:11:56, 148.73, 151.52, 75
06/22/2015 12:11:56, 148.73, 151.47, 75
06/23/2015 12:11:56, 148.67, 151.52, 75
06/24/2015 12:29:23, 148.27, 151.13, 75
06/25/2015 12:29:23, 149.07, 151.81, 75
06/26/2015 12:29:23, 149.70, 152.32, 75
06/27/2015 12:29:22, 149.47, 152.09, 75
06/28/2015 12:29:23, 149.47, 152.09, 75
06/29/2015 12:41:57, 149.47, 152.04, 75
06/30/2015 12:41:58, 150.27, 152.78, 75
07/01/2015 12:47:15, 150.38, 152.89, 75
07/02/2015 12:47:16, 150.38, 153.06, 75
07/03/2015 12:47:16, 150.33, 153.06, 75
07/04/2015 12:47:16, 150.33, 153.06, 75
07/05/2015 12:47:16, 150.33, 153.06, 75
07/06/2015 12:47:16, 150.33, 152.95, 75
07/07/2015 12:47:16, 150.73, 153.35, 75
07/08/2015 12:47:17, 150.27, 153.12, 75
07/09/2015 12:47:17, 150.10, 153.01, 75
07/10/2015 12:47:17, 149.70, 152.61, 75
07/11/2015 12:47:18, 149.70, 152.61, 75
07/12/2015 12:47:18, 149.70, 152.61, 75
07/13/2015 12:47:18, 149.70, 152.61, 75
07/14/2015 12:47:19, 149.70, 152.61, 75
07/15/2015 13:32:04, 149.53, 152.44, 75
07/16/2015 13:32:04, 149.93, 152.84, 75
07/17/2015 13:32:03, 150.27, 153.23, 75
07/18/2015 13:32:04, 150.16, 153.23, 75
07/19/2015 13:32:03, 150.16, 153.23, 75
07/20/2015 13:32:04, 149.93, 153.01, 75
07/21/2015 13:32:05, 150.21, 153.35, 75
07/22/2015 13:32:05, 149.87, 153.12, 75
07/23/2015 13:32:05, 149.76, 153.18, 90
07/24/2015 13:32:05, 149.64, 152.72, 75
07/25/2015 13:32:05, 149.76, 152.84, 75
07/26/2015 13:32:04, 149.76, 152.84, 75
07/27/2015 13:32:05, 150.10, 153.18, 75
07/28/2015 13:32:05, 150.50, 153.52, 75
07/29/2015 13:32:06, 150.73, 153.98, 90
07/30/2015 13:32:05, 151.01, 154.26, 90
07/31/2015 13:32:06, 150.95, 154.26, 90
08/01/2015 13:32:07, 150.67, 153.92, 90
08/02/2015 13:32:06, 150.67, 153.92, 90
08/03/2015 13:32:07, 150.73, 153.75, 75
08/04/2015 13:32:08, 150.27, 153.63, 90
08/05/2015 13:32:08, 150.10, 153.35, 75
08/06/2015 13:32:07, 150.10, 153.52, 90
08/07/2015 13:32:08, 150.73, 154.03, 90
08/08/2015 13:32:09, 150.84, 153.98, 90
08/09/2015 13:32:08, 150.84, 153.98, 90
08/10/2015 13:32:09, 151.24, 154.32, 90
08/11/2015 13:32:10, 151.58, 154.66, 90
08/12/2015 13:32:09, 151.18, 154.60, 90
08/13/2015 13:32:09, 151.24, 155.00, 90
08/14/2015 13:32:09, 151.35, 155.29, 90
08/15/2015 13:32:09, 151.35, 155.29, 90
08/16/2015 13:32:09, 151.35, 155.29, 90
08/17/2015 13:32:10, 151.75, 155.57, 90
08/18/2015 13:32:10, 151.92, 155.80, 90
08/19/2015 13:32:09, 152.21, 155.63, 90
08/20/2015 13:32:10, 151.92, 155.12, 90
08/21/2015 13:32:11, 152.21, 155.34, 90
08/23/2015 11:57:58, 152.15, 155.40, 90
08/24/2015 12:17:10, 151.64, 155.34, 90
08/25/2015 12:17:09, 151.70, 155.57, 90
08/26/2015 12:17:10, 151.58, 155.57, 45
08/27/2015 12:19:18, 151.64, 155.69, 45
08/28/2015 12:51:25, 151.92, 156.03, 45
08/29/2015 12:51:26, 152.09, 156.14, 45
08/30/2015 12:51:25, 152.09, 156.14, 45
08/31/2015 12:51:26, 152.15, 156.31, 45
09/01/2015 12:51:25, 151.64, 156.37, 45
09/02/2015 12:51:26, 152.04, 156.83, 45
09/03/2015 12:51:27, 152.32, 156.43, 45
09/04/2015 12:51:26, 152.55, 156.60, 45
09/05/2015 12:51:27, 152.27, 156.48, 90
09/06/2015 12:51:27, 152.27, 156.48, 90
09/07/2015 12:51:26, 152.27, 156.48, 90
09/08/2015 12:51:27, 152.38, 156.37, 90
09/09/2015 12:51:28, 152.61, 156.54, 90
09/10/2015 12:51:28, 153.01, 156.94, 90
09/11/2015 12:51:28, 153.12, 157.00, 90
09/12/2015 12:51:29, 153.29, 157.22, 90
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