TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker or making a Paypal contribution here: paypal.me/SupportTMC

Kevin Sharpe's decreased Roadster range

Discussion in 'Roadster' started by Kevin Sharpe, Sep 7, 2014.

  1. Kevin Sharpe

    Kevin Sharpe Active Member

    Joined:
    Jul 29, 2010
    Messages:
    1,761
    Location:
    Bradford on Avon, UK
    #1 Kevin Sharpe, Sep 7, 2014
    Last edited by a moderator: Sep 15, 2014
    [Moderator Note: The original thread title was "Tesla battery range degradation forcing return to gas"]

    I purchased a Tesla Roadster on 1st July 2010.

    Unfortunately, during the last four years I have grown increasing concerned about battery range loss despite raising the issue with Tesla many times (see #1 below for details). Today the range is still falling and stands at 159 ideal miles in standard mode and 199 ideal miles in range mode after driving 55,519 miles.

    By way of comparison, five UK Roadster owners have recently reported ideal range from 179-190 miles in standard mode (see #4 below for details) which is close to the range quoted by Tesla when new - 194 ideal miles in standard mode and 245 ideal miles in range mode.

    The Plug In America Roadster Battery Study (here) notes considerable variation amongst vehicles but also states “an average loss of about 3.7 ideal miles of range (1.6%) per 10,000 miles driven” which is roughly 20 miles after 55,000 miles. Clearly my current range degradation at 45 miles would not normally be expected until 100,000 miles according to this study.

    After eight weeks at the London workshop recently, the Tesla senior manager of engineering in Deer Creek wrote “we have determined that there has been no abnormal degradation with respect to your vehicle’s battery and that it is operating within normal operating parameters”.

    Following on from this I have been unable to obtain a statement from Tesla on what range loss would trigger a Roadster battery repair. Indeed, the Roadster Battery Extended Service Agreement explicitly excludes battery degradation stating “Failure means a complete failure of the Battery due to defects in material or workmanship of any battery manufactured or supplied by Tesla that occur under normal use. Failure does not include the gradual reduction in operating performance of the battery due to normal wear and tear”.

    The three year Roadster Vehicle ESA (here) and Roadster Battery ESA (here) cost a total £13,000 In October 2013.

    Logs from the UK cars (see #3 below for details) highlight the difference in CAC behaviour and IMO clearly indicate a fault with brick #8. The challenge now is to convince Tesla to do something about this long term problem.

    If you already own or are considering a Tesla Roadster I would strongly suggest you investigate the issues surrounding battery degradation. I also suggest everyone records logs on a regular basis because it’s only a matter of time until you will need them.

    Unfortunately for me time has run out and my regular trips are already beyond the range of my Roadster today :-(


    (1) My Tesla Roadster Battery History

    1st November 2011 - email from Tesla Service “We have notice that a component within your battery has started to work outside the recommended parameters and as a consequence we would like to replace it at your earliest convenience. This operation will take five working days and will need to be brought into our London workshop.”

    3rd December 2011 - car returned to me following battery repair.

    19th April 2012 - email to Tesla Service “Range seems to have tailed off a lot recently… I did a performance mode charge with no improvement. Can I send you the logs for analysis?”

    27th April 2012 - email from Tesla Service “Our technical team are looking into the range issue you have experienced lately.”

    8th May 2012 - Tesla Service visit my home and undertake some battery analysis.

    30th May 2012 - email to Tesla Service “Further to your recent visit I can confirm that the range has remained depressed following the battery work late last year.”

    June - October 2012 - worked with Tesla Service trying different charging regimes but range problems persisted.

    10th October 2012 - battery bleed resistors replaced at Tesla workshop.

    18th April 2013 - email to Tesla Service “I also think I've lost about 10% battery capacity now I've driven just over 40,486 miles… is this typical?”

    22nd April 2013 - email from Tesla Service “The battery concerns you have will need further investigation as you rightly point out, we would need to look at the log data, carry out a bleed test and the imbalance.”

    13th May 2013 - battery failed bleed test at Tesla workshop.

    30th May 2013 - email from Tesla Service regarding repair on 13th May “While investigating your range concerns/carrying out the battery bleed test we noticed one of the battery monitoring boards was showing some issue, one of the functions of the BMB is communicate with the VMS (vehicle management system) to monitor the battery voltage on each sheet, then when commanded by the VMS the BMB will discharge individual bricks within the sheet in coordination with the other 10 BMB’s in order to maintain correct state of charge of all bricks within the battery. Hence, if one of these boards is not functioning correctly this could have a detrimental effect on the calculated range.”

    30th May 2013 - email to Tesla Service “Brick 8 first showed up as the weakest performer on May 10th, 2011 and has*been the weakest performer consistently since July 3rd, 2011. That brick*has apparently been setting my CAC value all this time”

    30th May 2013 - email from Tesla Service “The CAC value is not calculated solely on the value of the lowest brick, *do you know which sheet was this information taken from?”

    June - October 2013 - worked with Tesla Service trying different charging regimes but range problems persisted.

    10th October 2013 - battery passed bleed test at Tesla workshop.

    20th June - 20th August 2014 - car at Tesla workshop following breakdown.

    5th July 2014 - email from Tesla Service “Completed a bleed scan. Battery is in good condition.”

    5th July 2014 - email to Tesla Service “Can you provide some detailed results of the battery bleed test? I want to understand when the battery warranty would be invoked.”

    7th July 2014 - email from Tesla Service “Unfortunately we cannot go into further detail with regards to the condition of the battery itself.”

    10th July 2014 - email to Tesla Service “I have reviewed car logs from May 2010 to June 2014 and it’s clear that*Brick 8 has been consistently the*weakest performer and is apparently setting the CAC value.”

    11th July 2014 - email from Tesla Service “Thank you for bringing this to our attention. We will immediately escalate this to our battery department to gain further insight”

    15th July 2014 - email from Tesla Service “With regards to the battery information you have provided, there is clearly some degradation occurring within the pack. However we have checked and fundamentally there is no fault within the battery. The reduction in range you are experiencing is related to this, however with the mileage you have covered in the Roadster this is to be expected.”

    15th July 2014 - I escalated this issue to Country Director for Tesla UK reminding him that “The battery pack has had problems with brick number 8 since at least February 2011”

    15th July 2014 - email from Country Director for Tesla UK “Thanks for your email. I am checking with xxxx and the team and we will get back to you”

    15th July 2014 - email from Tesla Service Management “I have been talking to our senior EU engineers regarding your battery concern. They will carry out further in depth analysis and report back to me as soon as possible.”

    16th July 2014 - responded to request for more information from Tesla Service Management by providing complete log history and background data (again!)

    26th July 2014 - email from Tesla Service “it’s probably best you can drive away in your Roadster. Firstly because currently we won’t be swapping out the battery pack, and secondly we are waiting on batteries for Roadsters that are ‘off-road’. We are in the midst of sourcing packs for them but currently I have been informed there is an extended lead time.”

    15th August 2014 - email from Tesla Service Management “we have raised your concern to the battery engineering team in Deer Creek and they have reviewed the log data from your Roadster. The response from our senior manager of engineering is as follows:
    *
    We are responding to your questions about the condition of your lithium-ion battery for your Roadster.* After a review of your vehicle’s historical log file and diagnostic data, we have determined that there has been no abnormal degradation with respect to your vehicle’s battery and that it is operating within normal operating parameters.

    The battery pack design is a collection of batteries (“bricks”) tied together in series and they each retain capacity at varying rates. When we evaluate the rate of capacity retention for the battery pack, we are actually evaluating each brick individually and focus our attention on the lowest capacity brick. From one date to the next, we expect to find the same brick location identified as the lowest capacity brick. For your vehicle, we have evaluated the capacity retention of pack, focusing on the brick in question (referenced as #8) and found it to be operating within expectations.”



    (2) Excerpts From My Tesla Roadster Battery Logs

    Note how bricknumber is always #8 and compare this with logs from ‘normal’ Roadsters in (3) below…

    timestamp, brickahmin, brickahave, bricknumber
    12/02/2011 15:11:20, 146.85, 149.07, 8
    12/03/2011 18:08:53, 146.85, 149.07, 8
    12/04/2011 20:26:32, 147.31, 149.47, 8
    12/06/2011 00:01:57, 147.31, 149.47, 8
    12/07/2011 00:01:56, 147.31, 149.47, 8
    12/08/2011 00:01:56, 147.53, 149.87, 8
    12/09/2011 00:01:56, 147.53, 149.87, 8
    12/10/2011 19:31:51, 147.70, 150.27, 8
    12/11/2011 19:31:51, 147.70, 150.27, 8
    12/12/2011 20:54:11, 148.10, 150.73, 8
    12/13/2011 22:41:19, 148.10, 150.73, 8
    12/14/2011 22:41:18, 147.82, 150.56, 8
    12/15/2011 22:41:18, 147.82, 150.56, 8
    12/16/2011 22:41:17, 147.82, 150.56, 8
    12/17/2011 22:41:17, 147.82, 150.56, 8
    12/18/2011 22:41:16, 147.82, 150.56, 8
    12/19/2011 22:41:16, 147.82, 150.56, 8
    12/20/2011 22:41:15, 147.88, 150.61, 8
    12/21/2011 22:41:15, 147.93, 150.61, 8
    12/22/2011 22:41:14, 147.93, 150.61, 8
    12/23/2011 22:41:14, 148.22, 150.84, 8
    12/24/2011 22:41:13, 148.22, 150.84, 8
    12/25/2011 22:41:13, 148.22, 150.84, 8
    12/26/2011 22:41:13, 148.22, 150.84, 8
    12/27/2011 22:41:13, 148.22, 150.84, 8
    12/28/2011 22:41:12, 148.22, 150.84, 8
    12/29/2011 22:41:11, 148.22, 150.84, 8
    12/30/2011 22:41:11, 148.22, 150.84, 8
    12/31/2011 22:41:11, 148.22, 150.84, 8
    01/01/2012 22:41:11, 148.22, 150.84, 8
    01/02/2012 22:41:12, 148.22, 150.84, 8
    01/03/2012 22:41:12, 148.22, 150.84, 8
    01/04/2012 22:41:10, 148.22, 150.84, 8
    01/05/2012 22:41:11, 148.45, 151.18, 8
    01/07/2012 00:19:02, 148.45, 151.18, 8
    01/08/2012 00:19:01, 148.16, 150.50, 8
    01/09/2012 04:43:17, 148.33, 150.56, 8
    01/10/2012 14:45:38, 148.67, 151.13, 8
    01/11/2012 14:45:38, 148.79, 151.41, 8
    01/12/2012 14:45:38, 148.79, 151.41, 8
    01/13/2012 14:45:37, 148.79, 151.41, 8
    01/14/2012 14:45:37, 148.79, 151.41, 8
    01/15/2012 14:45:36, 148.79, 151.41, 8
    01/16/2012 14:45:36, 148.79, 151.41, 8
    01/17/2012 14:45:35, 148.90, 151.52, 8
    01/18/2012 14:45:35, 149.02, 151.70, 8
    01/19/2012 14:45:35, 149.02, 151.70, 8
    01/20/2012 15:34:11, 149.02, 151.70, 8
    --------------
    timestamp, firmware version
    12/01/2011 15:05:07, 4.6.3 40
    Daily Timestamp from '12/01/2011 15:05:07' to '01/20/2012 15:34:11'; 50 days
    Detail Timestamp from 10/23/2011 20:59:23 to 01/20/2012 15:34:11; 88 days
    Days of detail: 51, odomoter max: 22823


    timestamp, brickahmin, brickahave, bricknumber
    04/16/2013 11:01:56, 143.71, 147.36, 8
    04/17/2013 11:01:56, 143.71, 147.36, 8
    04/18/2013 11:01:55, 143.71, 147.36, 8
    04/19/2013 11:01:55, 143.71, 147.36, 8
    04/20/2013 11:01:54, 143.71, 147.36, 8
    04/21/2013 11:01:55, 143.71, 147.36, 8
    04/22/2013 11:01:54, 143.71, 147.36, 8
    04/23/2013 11:01:54, 143.71, 147.36, 8
    04/24/2013 11:01:53, 143.71, 147.36, 8
    04/25/2013 11:01:53, 143.71, 147.36, 8
    04/26/2013 11:01:52, 143.71, 147.36, 8
    04/27/2013 11:22:40, 143.71, 147.36, 8
    04/28/2013 11:51:36, 142.75, 145.82, 8
    04/29/2013 11:51:36, 143.09, 146.34, 8
    04/30/2013 11:51:35, 143.09, 146.34, 8
    05/01/2013 11:55:01, 143.09, 146.34, 8
    05/02/2013 11:55:01, 143.09, 146.34, 8
    05/03/2013 13:27:32, 143.09, 146.34, 8
    05/04/2013 13:27:31, 142.92, 146.91, 8
    05/05/2013 13:27:31, 142.92, 146.91, 8
    05/06/2013 13:27:30, 142.92, 146.91, 8
    05/07/2013 13:27:31, 142.92, 146.91, 8
    05/07/2013 17:45:34, 0.00, 0.00, 0
    05/08/2013 17:45:34, 142.92, 146.91, 8
    05/10/2013 11:36:50, 142.92, 146.91, 8
    05/11/2013 11:36:51, 142.92, 146.91, 8
    05/12/2013 11:36:51, 142.92, 146.91, 8
    05/13/2013 11:46:03, 142.92, 146.91, 8
    05/14/2013 11:46:03, 141.89, 145.54, 8
    05/15/2013 11:46:01, 140.75, 145.14, 8
    05/16/2013 11:46:01, 141.26, 145.25, 8
    05/17/2013 11:46:02, 141.26, 145.25, 8
    05/18/2013 11:46:02, 141.26, 145.25, 8
    05/19/2013 11:46:01, 141.26, 145.25, 8
    05/20/2013 11:46:00, 141.26, 145.25, 8
    05/21/2013 13:34:03, 141.26, 145.25, 8
    05/22/2013 13:34:04, 141.55, 145.48, 8
    05/23/2013 13:34:04, 141.55, 145.48, 8
    05/24/2013 13:34:04, 141.55, 145.48, 8
    05/25/2013 13:34:04, 141.55, 145.48, 8
    05/26/2013 14:08:38, 141.55, 145.48, 8
    05/27/2013 14:28:43, 141.60, 145.54, 8
    05/28/2013 14:28:44, 141.60, 145.54, 8
    05/29/2013 19:06:20, 141.60, 145.54, 8
    05/30/2013 19:06:19, 141.78, 145.71, 8
    05/31/2013 19:06:20, 141.78, 145.71, 8
    06/01/2013 19:06:19, 141.78, 145.71, 8
    06/02/2013 19:06:19, 141.78, 145.71, 8
    06/03/2013 19:08:37, 141.78, 145.71, 8
    06/04/2013 19:08:36, 141.83, 145.71, 8
    06/05/2013 19:08:35, 141.83, 145.71, 8
    06/06/2013 20:27:06, 141.83, 145.88, 8
    06/07/2013 20:27:06, 141.83, 145.88, 8
    06/08/2013 20:27:05, 141.83, 145.88, 8
    06/09/2013 20:29:48, 142.23, 146.45, 8
    06/11/2013 07:50:05, 140.81, 145.48, 8
    06/12/2013 07:50:05, 140.81, 145.48, 8
    06/13/2013 09:56:35, 141.21, 145.77, 8
    06/14/2013 09:56:35, 139.67, 143.32, 8
    06/15/2013 09:56:34, 139.67, 143.32, 8
    06/16/2013 10:43:55, 140.01, 143.49, 8
    06/17/2013 14:40:29, 139.95, 143.60, 8
    06/18/2013 15:59:33, 139.95, 143.60, 8
    06/19/2013 15:59:33, 140.29, 143.94, 8
    06/20/2013 18:01:44, 140.41, 144.34, 8
    06/21/2013 20:18:36, 140.41, 144.34, 8
    06/22/2013 20:18:35, 140.86, 144.97, 8
    06/24/2013 02:04:16, 140.98, 145.08, 8
    06/25/2013 02:04:16, 141.21, 145.25, 8
    06/26/2013 03:00:05, 140.18, 145.25, 8
    06/27/2013 05:31:34, 140.46, 145.65, 8
    06/28/2013 05:31:33, 140.46, 145.88, 8
    06/29/2013 05:31:32, 140.98, 146.22, 8
    06/30/2013 07:23:46, 141.72, 146.62, 8
    07/01/2013 07:26:08, 141.72, 146.74, 8
    07/02/2013 07:58:22, 141.78, 146.85, 8
    07/03/2013 07:58:22, 141.95, 147.13, 8
    07/04/2013 08:31:30, 142.46, 147.93, 8
    07/05/2013 08:31:29, 142.52, 147.88, 8
    07/06/2013 08:31:30, 142.46, 147.59, 8
    07/07/2013 08:35:16, 142.52, 147.76, 8
    07/08/2013 08:35:16, 142.86, 148.05, 8
    07/09/2013 08:35:15, 142.80, 148.22, 8
    07/10/2013 08:35:16, 142.92, 148.22, 8
    07/11/2013 09:10:39, 142.12, 146.51, 8
    07/12/2013 10:09:08, 141.89, 146.17, 8
    07/13/2013 11:50:31, 141.78, 146.51, 8
    07/14/2013 18:36:23, 139.95, 143.77, 8
    07/15/2013 18:36:24, 139.67, 143.20, 8
    07/16/2013 18:36:24, 139.67, 143.20, 8
    07/17/2013 18:36:24, 139.67, 143.20, 8
    07/18/2013 18:36:23, 139.67, 143.20, 8
    07/19/2013 18:57:37, 139.72, 143.03, 8
    07/21/2013 07:29:23, 139.84, 143.26, 8
    07/22/2013 07:29:22, 139.89, 143.32, 8
    07/23/2013 08:41:45, 139.89, 143.32, 8
    07/24/2013 08:41:45, 139.89, 143.32, 8
    07/25/2013 08:41:44, 140.52, 144.46, 8
    07/26/2013 08:41:44, 140.52, 144.46, 8
    07/27/2013 08:41:43, 140.52, 144.46, 8
    07/28/2013 08:41:43, 140.52, 144.46, 8
    07/29/2013 08:41:44, 140.52, 144.46, 8
    07/30/2013 08:41:43, 140.52, 144.46, 8
    07/31/2013 08:41:43, 140.52, 144.46, 8
    08/01/2013 10:03:42, 140.52, 144.46, 8
    08/02/2013 10:03:44, 138.24, 141.89, 8
    08/03/2013 10:03:42, 138.24, 141.89, 8
    08/04/2013 10:03:43, 138.24, 141.89, 8
    08/05/2013 10:03:43, 138.24, 141.89, 8
    08/06/2013 10:03:42, 138.24, 141.89, 8
    08/07/2013 10:03:42, 138.24, 141.89, 8
    08/08/2013 10:03:41, 138.24, 141.89, 8
    08/09/2013 10:03:42, 138.24, 141.89, 8
    08/10/2013 10:03:41, 138.24, 141.89, 8
    08/11/2013 10:03:41, 138.24, 141.89, 8
    08/12/2013 10:03:41, 138.24, 141.89, 8
    08/13/2013 10:03:40, 138.24, 141.89, 8
    08/14/2013 10:03:40, 138.24, 141.89, 8
    08/15/2013 10:03:40, 138.24, 141.89, 8
    08/16/2013 10:03:39, 138.24, 141.89, 8
    08/17/2013 10:03:40, 138.24, 141.89, 8
    08/18/2013 10:03:39, 138.24, 141.89, 8
    08/19/2013 10:03:39, 138.24, 141.89, 8
    08/20/2013 10:03:38, 138.24, 141.89, 8
    08/21/2013 10:03:38, 138.24, 141.89, 8
    08/22/2013 10:03:38, 138.24, 141.89, 8
    08/23/2013 10:03:38, 138.24, 141.89, 8
    08/24/2013 10:03:38, 138.24, 141.89, 8
    08/25/2013 10:03:38, 138.24, 141.89, 8
    08/26/2013 10:03:38, 138.24, 141.89, 8
    08/27/2013 10:03:38, 138.24, 141.89, 8
    08/28/2013 10:03:37, 138.24, 141.89, 8
    08/29/2013 10:03:36, 138.24, 141.89, 8
    08/30/2013 10:03:36, 138.24, 141.89, 8
    08/31/2013 10:03:36, 138.24, 141.89, 8
    09/01/2013 10:03:35, 138.24, 141.89, 8
    09/02/2013 10:03:35, 138.24, 141.89, 8
    09/03/2013 10:03:34, 138.24, 141.89, 8
    09/04/2013 10:03:34, 138.24, 141.89, 8
    09/05/2013 10:03:35, 138.24, 141.89, 8
    09/06/2013 10:03:34, 138.24, 141.89, 8
    09/07/2013 10:03:35, 138.24, 141.89, 8
    09/08/2013 10:03:34, 138.24, 141.89, 8
    09/09/2013 10:03:33, 138.24, 141.89, 8
    09/10/2013 13:43:52, 138.24, 141.89, 8
    09/11/2013 15:56:22, 138.01, 141.49, 8
    09/12/2013 15:56:23, 137.73, 141.43, 8
    09/13/2013 17:04:50, 137.73, 141.43, 8
    09/14/2013 17:04:50, 137.96, 141.49, 8
    09/15/2013 17:04:49, 137.96, 141.49, 8
    09/16/2013 17:52:31, 136.87, 141.09, 8
    09/17/2013 17:52:32, 136.87, 141.09, 8
    09/18/2013 17:52:32, 137.16, 141.26, 8
    09/19/2013 17:52:31, 137.16, 141.26, 8
    09/20/2013 17:52:30, 137.16, 141.26, 8
    09/21/2013 17:52:29, 137.16, 141.26, 8
    09/22/2013 17:52:30, 137.16, 141.26, 8
    09/23/2013 17:52:30, 137.16, 141.26, 8
    09/24/2013 17:52:29, 137.16, 141.26, 8
    09/25/2013 17:52:28, 137.16, 141.26, 8
    09/26/2013 17:52:29, 137.16, 141.26, 8
    09/27/2013 17:52:28, 137.16, 141.26, 8
    09/28/2013 17:52:27, 137.16, 141.26, 8
    09/29/2013 17:52:27, 137.16, 141.26, 8
    09/30/2013 17:52:26, 137.16, 141.26, 8
    10/01/2013 17:52:26, 137.16, 141.26, 8
    10/02/2013 17:52:27, 137.16, 141.26, 8
    10/03/2013 17:52:26, 137.16, 141.26, 8
    10/04/2013 17:52:26, 137.16, 141.26, 8
    10/05/2013 18:31:07, 137.16, 141.26, 8
    10/06/2013 18:31:07, 137.16, 141.26, 8
    10/07/2013 18:31:07, 137.16, 141.26, 8
    10/08/2013 18:31:06, 137.16, 141.26, 8
    10/09/2013 20:44:00, 137.16, 141.26, 8
    10/11/2013 16:45:41, 135.11, 140.07, 8
    10/12/2013 16:53:36, 134.88, 139.55, 8
    10/13/2013 17:12:34, 135.73, 140.29, 8
    10/14/2013 17:12:34, 135.73, 140.29, 8
    10/15/2013 18:12:30, 135.73, 140.29, 8
    10/16/2013 18:12:31, 135.79, 140.35, 8
    10/17/2013 18:12:30, 135.79, 140.35, 8
    10/19/2013 08:52:11, 135.79, 140.52, 8
    10/20/2013 08:52:11, 135.85, 140.64, 8
    10/21/2013 08:52:11, 136.47, 140.81, 8
    10/22/2013 08:52:10, 136.47, 140.81, 8
    10/23/2013 08:52:09, 136.47, 140.81, 8
    10/24/2013 10:34:07, 137.22, 141.43, 8
    10/25/2013 10:34:08, 137.22, 141.43, 8
    10/26/2013 13:57:52, 137.61, 142.23, 8
    10/27/2013 12:57:52, 137.61, 142.23, 8
    10/28/2013 12:57:51, 137.61, 142.23, 8
    10/29/2013 12:57:50, 137.61, 142.23, 8
    10/30/2013 12:57:50, 137.61, 141.95, 8
    10/31/2013 15:41:13, 137.67, 142.18, 8
    11/01/2013 16:55:04, 137.67, 142.18, 8
    11/02/2013 18:00:09, 137.79, 142.29, 8
    11/03/2013 18:34:21, 137.96, 142.40, 8
    11/04/2013 18:34:21, 137.50, 141.89, 8
    11/05/2013 18:34:21, 138.07, 142.52, 8
    11/06/2013 18:34:22, 138.07, 142.52, 8
    11/07/2013 18:34:21, 138.07, 142.52, 8
    11/08/2013 18:34:21, 138.07, 142.52, 8
    11/09/2013 18:34:21, 138.07, 142.52, 8
    11/10/2013 19:01:09, 138.18, 142.69, 8
    11/11/2013 19:01:09, 138.18, 142.69, 8
    11/12/2013 19:01:08, 138.47, 142.97, 8
    11/13/2013 19:01:08, 138.47, 142.97, 8
    11/14/2013 19:01:08, 138.47, 142.97, 8
    11/15/2013 19:01:07, 138.53, 142.97, 8
    11/16/2013 19:01:07, 138.53, 143.09, 8
    11/17/2013 19:01:07, 138.53, 143.09, 8
    11/18/2013 19:01:07, 138.53, 143.09, 8
    11/19/2013 19:01:07, 138.53, 143.09, 8
    11/20/2013 19:01:06, 138.53, 143.09, 8
    11/22/2013 08:44:01, 138.53, 143.66, 8
    11/23/2013 08:44:00, 138.87, 144.11, 8
    11/24/2013 08:44:00, 138.87, 144.11, 8
    11/25/2013 08:44:00, 138.87, 144.11, 8
    11/26/2013 08:43:59, 138.87, 144.11, 8
    12/06/2013 15:02:43, 138.87, 144.11, 8
    12/07/2013 15:02:43, 138.87, 144.11, 8
    12/08/2013 15:02:42, 138.87, 144.11, 8
    12/09/2013 15:02:42, 138.87, 144.11, 8
    12/10/2013 15:14:58, 138.87, 144.11, 8
    12/11/2013 15:14:59, 138.98, 144.34, 8
    12/12/2013 16:33:19, 138.98, 144.34, 8
    12/13/2013 16:33:19, 138.98, 144.34, 8
    12/14/2013 16:33:18, 138.98, 144.34, 8
    12/15/2013 17:35:08, 138.98, 144.34, 8
    12/16/2013 17:35:09, 138.98, 144.34, 8
    12/17/2013 17:35:08, 138.98, 144.34, 8
    12/18/2013 17:35:08, 138.98, 144.34, 8
    12/19/2013 17:35:08, 138.81, 144.00, 8
    12/20/2013 17:35:07, 138.81, 144.00, 8
    12/21/2013 17:35:08, 139.04, 144.28, 8
    12/22/2013 19:11:40, 139.27, 144.51, 8
    12/23/2013 19:11:39, 139.27, 144.51, 8
    12/24/2013 19:11:39, 139.27, 144.51, 8
    12/25/2013 19:11:39, 139.27, 144.51, 8
    12/26/2013 19:11:40, 139.27, 144.51, 8
    12/27/2013 19:11:39, 139.27, 144.51, 8
    12/28/2013 19:11:38, 139.27, 144.51, 8
    12/29/2013 19:11:37, 139.27, 144.51, 8
    12/30/2013 19:11:38, 139.27, 144.51, 8
    12/31/2013 19:11:38, 139.27, 144.51, 8
    01/01/2014 19:11:37, 139.27, 144.51, 8
    01/02/2014 19:11:37, 139.27, 144.51, 8
    01/03/2014 19:11:36, 139.27, 144.51, 8
    01/04/2014 19:11:37, 139.27, 144.51, 8
    01/05/2014 19:11:36, 139.27, 144.51, 8
    01/06/2014 19:11:35, 139.27, 144.51, 8
    01/07/2014 19:11:35, 139.27, 144.51, 8
    01/08/2014 19:11:34, 139.27, 144.51, 8
    01/09/2014 19:11:35, 139.27, 144.51, 8
    01/10/2014 19:11:34, 139.27, 144.51, 8
    01/11/2014 19:11:34, 139.27, 144.51, 8
    01/12/2014 19:11:33, 139.27, 144.51, 8
    01/13/2014 19:11:33, 139.27, 144.51, 8
    01/14/2014 19:11:33, 139.27, 144.51, 8
    01/15/2014 19:11:32, 139.44, 144.68, 8
    01/16/2014 19:11:31, 139.38, 144.34, 8
    01/17/2014 19:11:31, 139.44, 144.57, 8
    01/18/2014 19:11:31, 139.44, 144.57, 8
    01/19/2014 19:11:31, 139.44, 144.57, 8
    01/20/2014 19:11:30, 139.44, 144.57, 8
    01/21/2014 19:11:30, 139.44, 144.57, 8
    01/22/2014 19:11:30, 139.44, 144.57, 8
    01/23/2014 19:11:29, 139.44, 144.57, 8
    01/24/2014 19:11:28, 139.44, 144.57, 8
    01/25/2014 19:11:27, 139.44, 144.57, 8
    01/26/2014 19:11:27, 139.44, 144.57, 8
    01/27/2014 19:11:27, 139.44, 144.57, 8
    01/29/2014 13:07:51, 138.47, 144.57, 8
    01/30/2014 13:07:52, 138.47, 144.57, 8
    01/31/2014 21:38:47, 137.61, 143.32, 8
    02/01/2014 21:38:48, 137.50, 143.14, 8
    02/02/2014 21:38:47, 137.50, 143.14, 8
    02/03/2014 21:38:47, 137.50, 143.14, 8
    02/04/2014 21:38:46, 137.50, 143.14, 8
    02/05/2014 21:38:46, 137.50, 143.14, 8
    02/06/2014 21:38:46, 137.50, 143.14, 8
    02/07/2014 21:38:46, 137.50, 143.14, 8
    02/08/2014 21:38:45, 137.50, 143.14, 8
    02/09/2014 21:38:44, 137.50, 143.14, 8
    02/10/2014 21:38:44, 137.50, 143.14, 8
    02/11/2014 21:38:44, 137.50, 143.14, 8
    02/12/2014 21:38:42, 137.50, 143.14, 8
    02/13/2014 21:38:42, 137.50, 143.14, 8
    02/14/2014 21:38:43, 137.50, 143.14, 8
    02/15/2014 21:38:43, 137.50, 143.14, 8
    02/16/2014 21:38:42, 137.50, 143.14, 8
    02/17/2014 21:38:42, 137.50, 143.14, 8
    02/18/2014 21:38:41, 137.50, 143.14, 8
    02/19/2014 21:38:41, 137.50, 143.14, 8
    02/20/2014 21:38:40, 137.39, 143.54, 8
    02/21/2014 21:38:40, 137.56, 143.66, 8
    02/22/2014 21:38:39, 137.56, 143.66, 8
    02/23/2014 21:38:40, 137.56, 143.66, 8
    02/24/2014 21:38:39, 137.56, 143.66, 8
    02/25/2014 21:38:39, 137.56, 143.66, 8
    02/26/2014 21:38:38, 137.56, 143.66, 8
    02/27/2014 21:38:38, 137.56, 143.66, 8
    02/28/2014 21:38:38, 137.56, 143.66, 8
    03/01/2014 21:38:37, 137.56, 143.66, 8
    03/02/2014 21:38:37, 137.56, 143.66, 8
    03/03/2014 21:38:36, 137.56, 143.66, 8
    03/04/2014 21:38:37, 137.56, 143.66, 8
    03/05/2014 21:38:36, 137.56, 143.66, 8
    03/06/2014 21:38:36, 137.56, 143.66, 8
    03/07/2014 21:38:36, 137.56, 143.66, 8
    03/08/2014 21:38:36, 137.56, 143.66, 8
    03/09/2014 21:38:36, 137.56, 143.66, 8
    03/10/2014 21:38:35, 137.56, 143.66, 8
    03/11/2014 21:38:34, 137.56, 143.66, 8
    03/12/2014 21:38:35, 137.22, 142.75, 8
    03/13/2014 21:38:35, 137.22, 143.14, 8
    03/14/2014 21:38:34, 137.22, 143.14, 8
    03/15/2014 21:38:33, 137.22, 143.14, 8
    03/16/2014 21:38:33, 137.22, 143.14, 8
    03/17/2014 21:38:33, 137.22, 143.14, 8
    03/18/2014 21:38:34, 137.22, 143.14, 8
    03/19/2014 21:38:33, 137.22, 143.14, 8
    03/20/2014 21:38:33, 137.22, 143.14, 8
    03/21/2014 21:38:33, 137.22, 143.14, 8
    03/22/2014 21:38:33, 137.22, 143.14, 8
    03/23/2014 21:38:32, 137.22, 143.14, 8
    03/24/2014 21:38:32, 137.22, 143.14, 8
    03/25/2014 21:38:31, 137.22, 143.14, 8
    03/26/2014 21:38:31, 137.22, 143.14, 8
    03/27/2014 21:38:31, 137.22, 143.14, 8
    03/28/2014 21:38:31, 137.22, 143.14, 8
    03/30/2014 00:44:19, 137.22, 143.14, 8
    03/31/2014 17:32:33, 137.84, 143.49, 8
    04/01/2014 17:32:32, 137.96, 143.54, 8
    04/02/2014 17:32:31, 137.96, 143.54, 8
    04/03/2014 17:32:29, 137.96, 143.54, 8
    04/04/2014 17:32:31, 137.96, 143.54, 8
    04/05/2014 17:32:31, 137.96, 143.54, 8
    04/06/2014 17:32:30, 137.96, 143.54, 8
    04/07/2014 17:32:30, 137.96, 143.54, 8
    04/08/2014 17:32:30, 137.96, 143.54, 8
    04/09/2014 17:32:30, 137.96, 143.54, 8
    04/10/2014 17:32:29, 137.96, 143.54, 8
    04/11/2014 17:32:29, 137.96, 143.54, 8
    04/12/2014 17:32:29, 137.96, 143.54, 8
    04/13/2014 17:58:40, 137.96, 143.54, 8
    04/14/2014 17:58:40, 137.96, 143.54, 8
    04/16/2014 02:40:01, 138.07, 143.37, 8
    04/17/2014 07:00:51, 138.47, 143.89, 8
    04/18/2014 07:00:51, 138.47, 143.83, 8
    04/19/2014 07:00:50, 138.47, 143.83, 8
    04/20/2014 07:00:49, 138.47, 143.83, 8
    04/21/2014 07:00:50, 138.47, 143.83, 8
    04/22/2014 07:00:50, 138.47, 143.83, 8
    04/23/2014 16:04:47, 138.24, 143.43, 8
    04/24/2014 17:57:01, 138.87, 143.94, 8
    04/25/2014 17:57:00, 136.70, 142.35, 8
    04/26/2014 17:56:59, 136.99, 141.95, 8
    04/27/2014 17:56:59, 136.99, 141.95, 8
    04/28/2014 17:56:59, 136.99, 141.95, 8
    04/29/2014 17:56:59, 136.99, 141.95, 8
    04/30/2014 17:56:59, 136.99, 141.95, 8
    05/01/2014 18:30:24, 136.99, 141.95, 8
    05/02/2014 18:44:26, 136.42, 141.89, 8
    05/03/2014 18:44:25, 136.42, 141.60, 8
    05/04/2014 18:44:24, 136.36, 141.49, 8
    05/05/2014 18:44:24, 136.36, 141.49, 8
    05/06/2014 18:44:25, 136.36, 141.49, 8
    05/07/2014 18:44:25, 136.36, 141.49, 8
    05/08/2014 18:44:24, 136.36, 141.49, 8
    05/09/2014 18:44:24, 136.36, 141.49, 8
    05/10/2014 18:44:23, 136.36, 141.49, 8
    05/11/2014 19:39:01, 136.93, 142.23, 8
    05/12/2014 19:39:01, 136.25, 141.15, 8
    05/13/2014 19:39:00, 134.88, 140.75, 8
    05/14/2014 19:39:01, 134.88, 140.75, 8
    05/15/2014 19:39:00, 134.88, 140.75, 8
    05/16/2014 19:39:00, 134.88, 140.75, 8
    05/17/2014 19:39:00, 134.88, 140.75, 8
    05/18/2014 19:38:59, 134.88, 140.75, 8
    05/19/2014 19:38:58, 134.88, 140.75, 8
    05/20/2014 19:38:57, 134.88, 140.75, 8
    05/21/2014 19:38:57, 134.88, 140.75, 8
    05/22/2014 19:46:57, 135.22, 140.92, 8
    05/24/2014 08:24:05, 133.00, 139.15, 8
    05/25/2014 08:24:05, 133.05, 139.21, 8
    05/26/2014 08:24:04, 133.05, 139.21, 8
    05/27/2014 08:24:04, 133.05, 139.21, 8
    05/28/2014 08:24:04, 133.05, 139.21, 8
    05/29/2014 08:24:04, 133.05, 139.21, 8
    05/30/2014 08:24:04, 133.05, 139.21, 8
    05/31/2014 08:24:03, 133.05, 139.32, 8
    06/01/2014 12:53:43, 132.48, 137.79, 8
    06/02/2014 13:30:37, 132.31, 137.39, 8
    06/03/2014 18:26:01, 131.97, 136.47, 8
    06/04/2014 18:26:04, 131.91, 136.36, 8
    06/05/2014 18:26:03, 131.91, 136.36, 8
    06/06/2014 18:26:03, 131.97, 136.47, 8
    06/07/2014 18:28:17, 132.31, 136.87, 8
    06/08/2014 18:28:17, 130.77, 135.68, 8
    06/09/2014 18:28:17, 131.00, 135.68, 8
    06/10/2014 18:28:16, 131.00, 135.68, 8
    06/11/2014 18:28:16, 131.00, 135.68, 8
    06/12/2014 18:28:16, 131.00, 135.68, 8
    06/13/2014 18:28:15, 131.00, 135.68, 8
    06/14/2014 18:28:15, 131.00, 135.68, 8
    06/15/2014 18:28:15, 131.17, 135.85, 8
    06/16/2014 18:28:16, 129.23, 135.22, 8
    06/17/2014 18:28:15, 129.01, 135.16, 8
    06/18/2014 18:28:14, 129.01, 135.16, 8
    06/19/2014 18:28:15, 129.18, 135.33, 8
    06/20/2014 19:02:27, 129.18, 135.33, 8
    06/21/2014 19:02:28, 129.18, 135.33, 8
    06/22/2014 19:02:27, 129.18, 135.33, 8
    06/23/2014 19:02:26, 129.18, 135.33, 8
    06/24/2014 19:02:25, 129.18, 135.33, 8
    06/25/2014 19:02:25, 129.18, 135.33, 8
    06/26/2014 19:02:25, 129.18, 135.33, 8
    06/27/2014 19:02:24, 129.18, 135.33, 8
    06/28/2014 19:02:24, 129.18, 135.33, 8
    06/29/2014 19:02:24, 129.18, 135.33, 8
    06/30/2014 19:02:24, 129.18, 135.33, 8
    07/01/2014 09:22:32, 0.00, 0.00, 0
    07/02/2014 15:23:02, 129.41, 135.11, 8
    07/03/2014 15:23:03, 129.41, 135.11, 8
    07/05/2014 15:27:46, 129.41, 135.11, 8
    07/06/2014 15:27:45, 129.41, 135.11, 8
    07/07/2014 15:27:45, 129.41, 135.11, 8
    07/08/2014 15:27:45, 129.41, 135.11, 8
    07/09/2014 15:27:45, 129.41, 135.11, 8
    07/10/2014 15:27:45, 129.41, 135.11, 8
    07/11/2014 15:27:44, 129.41, 135.11, 8
    07/12/2014 15:27:44, 129.41, 135.11, 8
    07/13/2014 15:27:44, 129.41, 135.11, 8
    07/15/2014 13:01:19, 129.41, 135.11, 8
    07/16/2014 13:01:18, 129.41, 135.11, 8
    07/17/2014 13:05:33, 129.41, 135.11, 8
    07/18/2014 13:05:33, 129.41, 135.11, 8
    07/19/2014 13:05:33, 129.41, 135.11, 8
    07/20/2014 13:05:32, 129.41, 135.11, 8
    07/21/2014 13:05:32, 129.41, 135.11, 8
    07/22/2014 13:05:32, 129.41, 135.11, 8
    07/23/2014 13:05:31, 129.41, 135.11, 8
    07/24/2014 13:05:31, 129.41, 135.11, 8
    07/25/2014 13:05:31, 129.41, 135.11, 8
    07/26/2014 13:05:30, 129.41, 135.11, 8
    07/27/2014 13:05:29, 129.41, 135.11, 8
    07/28/2014 13:05:30, 129.41, 135.11, 8
    07/29/2014 13:05:31, 129.41, 135.11, 8
    07/30/2014 13:05:29, 129.41, 135.11, 8
    07/31/2014 13:05:29, 129.41, 135.11, 8
    08/01/2014 13:05:30, 129.41, 135.11, 8
    08/02/2014 13:05:29, 129.41, 135.11, 8
    08/03/2014 13:05:29, 129.41, 135.11, 8
    08/04/2014 13:05:30, 129.41, 135.11, 8
    08/05/2014 13:05:29, 129.41, 135.11, 8
    08/06/2014 13:05:29, 129.41, 135.11, 8
    08/07/2014 13:05:28, 129.41, 135.11, 8
    08/08/2014 13:05:28, 129.41, 135.11, 8
    08/09/2014 13:05:28, 129.41, 135.11, 8
    08/10/2014 13:05:27, 129.41, 135.11, 8
    08/11/2014 13:05:26, 129.41, 135.11, 8
    08/12/2014 13:05:25, 129.41, 135.11, 8
    08/13/2014 13:05:26, 129.41, 135.11, 8
    08/14/2014 13:05:26, 129.41, 135.11, 8
    08/15/2014 13:05:26, 129.41, 135.11, 8
    08/16/2014 13:05:26, 129.41, 135.11, 8
    08/17/2014 13:05:25, 129.41, 135.11, 8
    08/18/2014 13:05:25, 129.41, 135.11, 8
    08/19/2014 13:05:25, 129.41, 135.11, 8
    --------------
    timestamp, firmware version
    04/15/2013 10:57:36, 4.6.5 40
    07/01/2014 15:18:42, 4.6.8 40
    Daily Timestamp from '04/15/2013 10:57:36' to '11/26/2013 08:43:59'; 224 days
    Detail Timestamp from ------------------- to -------------------; 0 days
    Days of detail: 0, odomoter max: 55519



    (3) Excerpt from UK Tesla Roadster Battery Logs

    Note how bricknumber varies overtime…

    timestamp, brickahmin, brickahave, bricknumber
    02/07/2014 17:52:07, 149.81, 152.49, 91
    02/08/2014 17:52:08, 149.07, 151.58, 93
    02/09/2014 17:52:08, 149.59, 152.27, 68
    02/10/2014 17:52:07, 149.59, 152.27, 68
    02/11/2014 17:52:07, 149.53, 152.15, 68
    02/13/2014 04:01:46, 149.41, 152.09, 68
    02/14/2014 04:01:46, 149.41, 152.09, 68
    02/15/2014 04:01:46, 149.41, 152.09, 68
    02/16/2014 04:01:47, 149.41, 152.09, 68
    02/17/2014 05:25:11, 149.41, 152.09, 68
    02/18/2014 05:25:11, 149.41, 152.09, 68
    02/19/2014 05:25:11, 149.41, 152.09, 68
    02/20/2014 05:25:12, 149.41, 152.09, 68
    02/21/2014 05:25:12, 149.41, 152.09, 68
    02/22/2014 05:25:12, 149.41, 152.09, 68
    02/23/2014 05:25:13, 149.41, 152.09, 68
    02/24/2014 05:25:13, 149.41, 152.09, 68
    02/25/2014 05:25:13, 149.41, 152.09, 68
    02/26/2014 06:31:44, 149.47, 152.44, 92
    02/27/2014 06:31:44, 149.47, 152.44, 92
    02/28/2014 06:31:45, 149.81, 152.72, 92
    03/01/2014 08:41:15, 149.81, 152.72, 92
    03/02/2014 08:41:15, 149.81, 152.72, 92
    03/03/2014 08:41:14, 149.81, 152.72, 92
    03/04/2014 12:28:14, 150.10, 152.95, 92
    03/05/2014 14:33:50, 149.36, 152.27, 92
    03/06/2014 14:33:50, 149.53, 152.21, 68
    03/07/2014 15:24:01, 149.81, 152.72, 92
    03/08/2014 15:24:01, 149.87, 152.89, 92
    03/09/2014 15:46:47, 149.87, 152.89, 92
    03/10/2014 15:46:46, 150.10, 153.06, 92
    03/11/2014 15:46:47, 150.10, 153.06, 92
    03/12/2014 15:46:47, 150.10, 153.06, 92
    03/13/2014 15:46:47, 150.10, 153.06, 92
    03/14/2014 15:46:47, 150.10, 153.06, 92
    03/15/2014 15:46:47, 150.10, 153.06, 92
    03/16/2014 15:46:48, 150.10, 153.06, 92
    03/17/2014 16:00:06, 150.10, 153.06, 92
    03/18/2014 16:00:06, 150.10, 153.06, 92
    03/19/2014 16:00:06, 151.01, 153.98, 91
    03/20/2014 16:00:07, 151.01, 153.98, 91
    03/21/2014 16:00:07, 151.07, 154.09, 91
    03/22/2014 16:00:08, 151.07, 154.09, 91
    03/23/2014 16:00:08, 151.07, 154.09, 91
    03/24/2014 16:00:08, 151.07, 154.09, 91
    03/25/2014 16:00:09, 151.30, 154.32, 68
    03/26/2014 16:00:09, 151.64, 154.55, 68
    03/27/2014 16:00:09, 151.64, 154.55, 68
    03/28/2014 16:00:10, 151.64, 154.55, 68
    03/29/2014 16:00:10, 151.64, 154.55, 68
    03/30/2014 17:00:10, 151.64, 154.55, 68
    03/31/2014 17:00:11, 151.64, 154.55, 68
    04/01/2014 17:00:12, 151.64, 154.55, 68
    04/02/2014 17:20:31, 151.64, 154.55, 68
    04/03/2014 17:20:32, 150.78, 153.69, 91
    04/05/2014 01:17:39, 150.84, 153.80, 91
    04/06/2014 01:17:40, 150.84, 153.80, 91
    04/07/2014 06:15:49, 150.90, 153.86, 95
    04/08/2014 06:15:49, 150.84, 153.86, 91
    04/09/2014 06:15:50, 149.76, 153.06, 91
    04/10/2014 06:15:50, 149.76, 153.06, 91
    04/11/2014 06:15:49, 149.76, 153.06, 91
    04/12/2014 06:15:49, 149.76, 153.06, 91
    04/13/2014 06:15:50, 149.76, 153.06, 91
    04/14/2014 06:15:50, 149.76, 153.06, 91
    04/15/2014 06:43:54, 149.76, 153.06, 91
    04/16/2014 06:43:54, 149.98, 152.84, 91
    04/17/2014 07:27:58, 150.10, 153.12, 91
    04/18/2014 07:27:58, 149.87, 153.12, 92
    04/19/2014 07:27:59, 149.87, 153.12, 92
    04/20/2014 07:27:58, 149.87, 153.12, 92
    04/21/2014 07:28:00, 149.87, 153.12, 92
    04/22/2014 07:27:59, 149.87, 153.12, 92
    04/23/2014 08:33:38, 149.93, 153.12, 92
    04/24/2014 08:33:38, 150.33, 153.46, 91
    04/25/2014 08:36:24, 150.73, 153.92, 91
    04/26/2014 08:36:24, 150.56, 153.86, 91
    04/27/2014 08:36:24, 150.56, 153.86, 91
    04/28/2014 08:36:23, 150.56, 153.86, 91
    04/29/2014 08:36:24, 150.56, 153.86, 91
    04/30/2014 08:36:24, 150.56, 153.86, 91
    05/01/2014 08:36:25, 150.56, 153.86, 91
    05/02/2014 08:36:25, 149.76, 153.58, 91
    05/03/2014 08:36:25, 149.70, 153.69, 91
    05/04/2014 08:36:25, 149.70, 153.69, 91
    05/05/2014 08:36:26, 149.70, 153.69, 91
    05/06/2014 08:36:25, 149.70, 153.69, 91
    05/07/2014 08:36:25, 149.70, 153.69, 91
    05/08/2014 08:36:26, 149.70, 153.69, 91
    05/09/2014 08:36:27, 149.70, 153.69, 91
    05/10/2014 08:36:26, 149.70, 153.69, 91
    05/11/2014 08:36:27, 149.70, 153.69, 91
    05/12/2014 08:36:27, 149.70, 153.69, 91
    05/13/2014 08:36:28, 149.70, 153.69, 91
    05/14/2014 08:36:28, 149.70, 153.69, 91
    05/15/2014 08:36:28, 149.70, 153.69, 91
    05/16/2014 08:36:29, 149.70, 153.69, 91
    05/17/2014 08:36:30, 149.70, 153.69, 91
    05/18/2014 08:36:31, 149.70, 153.69, 91
    05/19/2014 08:36:31, 149.70, 153.69, 91
    05/20/2014 15:21:56, 149.70, 153.69, 91
    05/21/2014 17:38:17, 149.70, 153.69, 91
    05/22/2014 19:05:30, 149.70, 153.69, 91
    05/23/2014 19:05:31, 150.21, 153.98, 91
    05/25/2014 08:46:30, 150.21, 153.63, 91
    05/26/2014 09:01:12, 150.10, 153.18, 91
    05/27/2014 09:56:20, 150.27, 153.23, 91
    05/28/2014 11:23:14, 150.33, 153.12, 91
    05/29/2014 11:30:26, 150.56, 153.23, 91
    05/30/2014 11:30:25, 150.33, 152.44, 93
    05/31/2014 11:30:25, 148.10, 150.04, 93
    06/01/2014 11:30:26, 148.10, 150.04, 93
    06/02/2014 11:30:26, 148.10, 150.04, 93
    06/03/2014 11:49:46, 148.50, 150.44, 93
    06/04/2014 12:04:50, 149.19, 151.13, 93
    06/05/2014 12:04:50, 147.99, 150.38, 93
    06/06/2014 12:04:51, 148.50, 150.95, 68
    06/07/2014 12:28:57, 148.62, 151.07, 68
    06/08/2014 12:28:56, 146.68, 148.62, 95
    06/09/2014 12:39:56, 147.93, 149.93, 95
    06/10/2014 12:39:56, 148.05, 150.04, 95
    06/11/2014 12:39:57, 148.05, 150.04, 95
    06/12/2014 21:31:12, 148.05, 150.04, 95
    06/13/2014 23:21:54, 148.50, 150.44, 95
    06/14/2014 23:26:29, 148.62, 150.50, 95
    06/15/2014 23:26:28, 148.67, 150.56, 95
    06/16/2014 23:26:30, 148.67, 150.56, 95
    06/17/2014 23:26:31, 148.67, 150.56, 95
    06/18/2014 23:26:31, 148.67, 150.56, 95
    06/19/2014 23:26:31, 148.67, 150.56, 95
    06/20/2014 23:26:32, 148.67, 150.56, 95
    06/21/2014 23:26:33, 148.67, 150.56, 95
    06/22/2014 23:26:33, 148.67, 150.56, 95
    06/23/2014 23:26:34, 148.67, 150.56, 95
    06/24/2014 23:26:33, 148.67, 150.56, 95
    06/26/2014 04:30:58, 149.13, 151.13, 68
    06/27/2014 04:30:59, 149.13, 151.13, 68
    06/28/2014 18:43:08, 147.59, 149.93, 92
    06/29/2014 18:43:08, 147.59, 149.93, 92
    06/30/2014 18:43:09, 147.59, 149.93, 92
    07/01/2014 18:43:09, 147.59, 149.93, 92
    07/02/2014 18:43:10, 147.59, 149.93, 92
    07/03/2014 18:43:10, 147.59, 149.93, 92
    07/04/2014 18:43:10, 147.59, 149.93, 92
    07/05/2014 18:43:11, 147.59, 149.93, 92
    07/06/2014 18:43:12, 147.59, 149.93, 92
    07/07/2014 18:43:13, 147.59, 149.93, 92
    07/08/2014 18:43:13, 147.59, 149.93, 92
    07/09/2014 18:43:13, 147.59, 149.93, 92
    07/10/2014 18:43:13, 147.59, 149.93, 92
    07/11/2014 19:11:39, 147.59, 149.93, 92
    --------------
    timestamp, firmware version
    02/06/2014 17:47:47, 4.6.5 40
    03/03/2014 12:23:54, 4.6.8 40
    Daily Timestamp from '02/06/2014 17:47:47' to '07/12/2014 13:11:43'; 155 days
    Detail Timestamp from 05/26/2014 11:48:27 to 07/12/2014 13:11:43; 47 days
    Days of detail: 48, odomoter max: 49158



    (4) UK Tesla Roadsters Range Reports

    Eugene Lambert (5,000 miles) - “about 190 miles”

    David Peilow (12,800 miles) - “After 4 years, @TeslaMotors Roadster still getting 183/184 ideal miles standard mode and 234/235 miles range mode” David Peilow on Twitter:

    Mark Perrin (19,000 miles, CAC 150) - “mines 181 on Standard today” Mark Perrin on Twitter:

    Mark Sanders (12,000 miles, CAC 153) - “similar .... varies 179 to 184, CAC gradually increased” Mark Sanders on Twitter:

    Alexander Sims (51,000 miles) - “Had 190 miles when brand new, now 50,000 miles later I still get 182 on a charge... Amazing” Alexander Sims on Twitter:
     
  2. abasile

    abasile Independent Software Eng.

    Joined:
    Oct 21, 2012
    Messages:
    356
    Location:
    San Bernardino Mts., CA (Elev. 6100' / 1800m)
    If I'm understanding correctly, after 55K miles and four years, your Roadster has lost 19% of its battery capacity. While this is high compared to the average Roadster capacity loss, could it be that this is indeed "within normal operating parameters" for a Roadster? Certainly, within what could be considered "normal", some will do better than others. I think I recall reading that the Model S battery packs are engineered to last longer than Roadster batteries.

    I'm sure you're aware that the first generation Nissan LEAF batteries (which are not thermally managed unlike Tesla's packs) have lost capacity more rapidly than hoped for. At 50K miles and 3+ years of ownership, my 2011 LEAF's battery capacity is down 20%. This is disappointing, but it doesn't rise to the level of a warranty claim and my LEAF continues to be very useful. I would certainly hope for more from Tesla, and I can sympathize with you, but this situation doesn't seem black and white to me.
     
  3. spaceballs

    spaceballs Member

    Joined:
    Sep 17, 2013
    Messages:
    533
    Location:
    Sammamish
    Kevin, did you tried hcsharp and my idea? what was your result?
    Need roadster advice - Page 4

    - - - Updated - - -

    Also from what I remember of his other posts, it looked like was all of that lost capacity was due to one brick (one bank of batteries out of 99). So swapping in a new sheet (contains 9 bricks) would fix this.
     
  4. Kevin Sharpe

    Kevin Sharpe Active Member

    Joined:
    Jul 29, 2010
    Messages:
    1,761
    Location:
    Bradford on Avon, UK
    Not yet... I've been traveling for almost three months and Tesla had the car for two... I'm around for a couple of weeks so will record the results and post them here.

    Correct, if you look at my logs above you'll see brick #8 has been setting the CAC since at least December 2011. An ex-Tesla ESS engineer commented privately that swapping the sheet would have solved this :confused:
     
  5. wycolo

    wycolo Active Member

    Joined:
    May 16, 2012
    Messages:
    2,421
    Location:
    WY
    Or somehow going in and disabling the bad bank of the 99, which would reduce kwh of battery by only 1 per cent (??).
    --
     
  6. spaceballs

    spaceballs Member

    Joined:
    Sep 17, 2013
    Messages:
    533
    Location:
    Sammamish
    Interesting that you say that, my roadster is currently doing exactly that :)
    Problem is bypassing the bad brick, is much harder than just swapping in a new sheet!
     
  7. tom66

    tom66 Member

    Joined:
    Dec 17, 2013
    Messages:
    622
    Location:
    United Kingdom
    You can't disable just one brick - you risk under-discharging or reverse biasing the brick which could lead to a battery fire. You might be able to bypass it - but the operation would be quite complicated.
     
  8. marco2228

    marco2228 Roadster Signature #34

    Joined:
    Nov 19, 2010
    Messages:
    185
    Location:
    Cologne/Bremen , Germany
    How do you get this spread sheet and these numbers, Kevin?
    What file in the log shows that?

    Thanks
     
  9. stopcrazypp

    stopcrazypp Well-Known Member

    Joined:
    Dec 8, 2007
    Messages:
    7,035
    Aren't the bricks all in series? So if you "bypass" one, your battery voltage would drop.
     
  10. spaceballs

    spaceballs Member

    Joined:
    Sep 17, 2013
    Messages:
    533
    Location:
    Sammamish
    How much longer is your ESS ESA before it runs out?
    When it does expire, and if you still have the low brick present in the roadster. I'm building for myself an BMB add-on attachment that can do active balancing within the sheet. Though it's only limited to 0.5 Amps but it will do it continuously to balance the sheet while the car is idle. It might (that a big if) help your scenario.

    - - - Updated - - -

    Yes battery voltage does drop.. but with some BMB add-ons you can still drive it :)
     
  11. dsm363

    dsm363 Roadster + Sig Model S

    Joined:
    May 17, 2009
    Messages:
    18,235
    Location:
    Las Vegas, NV
    It seems odd that if one brick is consistently low that Tesla wouldn't replace it. Must be more to story.
     
  12. andrewket

    andrewket 2014 S P85DL, 2016 X P90DL (soon 100)

    Joined:
    Dec 20, 2012
    Messages:
    5,042
    Tesla battery range degredation forcing return to gas

    Putting the warranty issue aside for the moment; Have you asked Tesla if they would be willing to replace the one sheet and what they would charge?
     
  13. spaceballs

    spaceballs Member

    Joined:
    Sep 17, 2013
    Messages:
    533
    Location:
    Sammamish
    I was able to do this, but it's more work than I recommend for anyone one do to. As you have to pull out the sheet, disconnect all cells in that brick, then bypass it, and then build BMB addons.. i.e. just be easier to buy a new sheet.

    - - - Updated - - -

    +This
    I still never got an answer on dollar amount when I asked about it.
     
  14. spaceballs

    spaceballs Member

    Joined:
    Sep 17, 2013
    Messages:
    533
    Location:
    Sammamish
    Likely brick AH is still within the calculated lifetime AH window for it's age/usage.
     
  15. JRP3

    JRP3 Hyperactive Member

    Joined:
    Aug 20, 2007
    Messages:
    10,082
    Location:
    Central New York
    Translation: "We can't get the cells right now and other cars are worse off than yours." Unfortunate that they left you hanging like this, hopefully they can do something soon.
     
  16. spaceballs

    spaceballs Member

    Joined:
    Sep 17, 2013
    Messages:
    533
    Location:
    Sammamish
    This is a good point you noticed, as this could affect customers that is asking (or needing) replacements sheets/ESS/etc..
     
  17. dpeilow

    dpeilow Moderator

    Joined:
    May 23, 2008
    Messages:
    8,572
    Location:
    Winchester, UK
    It looks like while Kevin's pack may just be within the confines of the warranty, Tesla are stringing him out until 1) they can source new cells/bricks/entire ESSes or 2) his warranty runs out. Even if technically the ESS is within spec at the moment, on its current trajectory it soon won't be. For that reason alone this is just catastrophically bad customer service and PR.

    It's pretty obvious now why they had to announce a 400 mile pack, even if they don't have the details worked out.
     
  18. qwk

    qwk Model S P2681

    Joined:
    Dec 19, 2008
    Messages:
    2,817
    This has got to be it, because the pack is always going to be limited by the weakest sheet. It used to be around $4k to replace a sheet, but I would bet that Tesla isn't offering this anymore due to 2.2 Ah cell shortages(they haven't been manufactured for quite some time).
     
  19. Mark77a

    Mark77a Member

    Joined:
    Jul 7, 2012
    Messages:
    292
    Location:
    Poole, Dorset, UK
    Sadly, this looks like the case.

    And a PR disaster in waiting if Tesla evangelists like Kevin, are given what appears to be the 'cold shoulder'.
    If only Tesla could offer some more transparency and less secrecy. Releasing workshop manuals would be a start.
     
  20. abasile

    abasile Independent Software Eng.

    Joined:
    Oct 21, 2012
    Messages:
    356
    Location:
    San Bernardino Mts., CA (Elev. 6100' / 1800m)
    Indeed, they ought to give Kevin and other Roadster owners a cut-rate price on the "400 mile" upgrade.
     

Share This Page