NewEnergyNews: TODAY’S STUDY: THE POWER OF TESLA’S BATTERY

NewEnergyNews

Gleanings from the web and the world, condensed for convenience, illustrated for enlightenment, arranged for impact...

The challenge now: To make every day Earth Day.

YESTERDAY

  • TODAY’S STUDY: The Way To Grow EVs
  • QUICK NEWS, April 25: Private Sector Takes Over The Climate Fight; How Sea Level Rise Would Change The Map; Wind Jobs Top 100,000 As Wind Energy Booms
  • THE DAY BEFORE

  • TODAY’S STUDY: The Risk Of Natural Gas Vs. The Risk Of Wind
  • QUICK NEWS, April 24: The Health Impacts Of Climate Change; New Energy Is Everywhere; Study Shows LA Does Not Need Aliso Canyon
  • THE DAY BEFORE THE DAY BEFORE

  • Weekend Video: How To Win Friends For New Energy
  • Weekend Video: The Electric Vehicle Highway
  • Weekend Video: Wind And The Economy
  • THE DAY BEFORE THAT

  • FRIDAY WORLD HEADLINE-A Deeper Look At The Heat
  • FRIDAY WORLD HEADLINE-Wind Gets Market Tough
  • FRIDAY WORLD HEADLINE-UK Gets Utility-Led Solar Plus Storage
  • FRIDAY WORLD HEADLINE-Germany’s VW Talking Its EV To China
  • AND THE DAY BEFORE THAT

    THINGS-TO-THINK-ABOUT THURSDAY, April 20:

  • TTTA Thursday-U.S. Military Affirms Climate Change-War Link
  • TTTA Thursday-Solar Plus Hydro Drive Wholesale Power Cost Sub-Zero
  • TTTA Thursday-Wind Boom Goes On Growing Midwest Wealth
  • TTTA Thursday-More Kentucky Jobs In New Energy Than In Coal
  • THE LAST DAY UP HERE

  • ORIGINAL REPORTING: Rocky Mountain compromise: Inside Xcel's landmark Colorado solar settlement
  • ORIGINAL REPORTING: Fixed charge battle looms in Texas as regulators tackle rate design reform
  • ORIGINAL REPORTING: No time to think: How utilities are handling the deluge of grid data

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    Anne B. Butterfield of Daily Camera and Huffington Post, f is an occasional contributor to NewEnergyNews

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    Some of Anne's contributions:

  • Another Tipping Point: US Coal Supply Decline So Real Even West Virginia Concurs (REPORT), November 26, 2013
  • SOLAR FOR ME BUT NOT FOR THEE ~ Xcel's Push to Undermine Rooftop Solar, September 20, 2013
  • NEW BILLS AND NEW BIRDS in Colorado's recent session, May 20, 2013
  • Lies, damned lies and politicians (October 8, 2012)
  • Colorado's Elegant Solution to Fracking (April 23, 2012)
  • Shale Gas: From Geologic Bubble to Economic Bubble (March 15, 2012)
  • Taken for granted no more (February 5, 2012)
  • The Republican clown car circus (January 6, 2012)
  • Twenty-Somethings of Colorado With Skin in the Game (November 22, 2011)
  • Occupy, Xcel, and the Mother of All Cliffs (October 31, 2011)
  • Boulder Can Own Its Power With Distributed Generation (June 7, 2011)
  • The Plunging Cost of Renewables and Boulder's Energy Future (April 19, 2011)
  • Paddling Down the River Denial (January 12, 2011)
  • The Fox (News) That Jumped the Shark (December 16, 2010)
  • Click here for an archive of Butterfield columns

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    Some details about NewEnergyNews and the man behind the curtain: Herman K. Trabish, Agua Dulce, CA., Doctor with my hands, Writer with my head, Student of New Energy and Human Experience with my heart

    email: herman@NewEnergyNews.net

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      A tip of the NewEnergyNews cap to Phillip Garcia for crucial assistance in the design implementation of this site. Thanks, Phillip.

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    Pay a visit to the HARRY BOYKOFF page at Basketball Reference, sponsored by NewEnergyNews and Oil In Their Blood.

  • ---------------
  • TODAY AT NewEnergyNews, April 26:

  • ORIGINAL REPORTING: Mixed-ownership models spur utility investment in microgrids
  • ORIGINAL REPORTING: How the wind industry can continue its boom into the 2020s
  • ORIGINAL REPORTING: Rhode Island targets a common perspective on DER values

    Monday, July 22, 2013

    TODAY’S STUDY: THE POWER OF TESLA’S BATTERY

    Plug In America’s Tesla Roadster Battery Study

    Tom Saxton, July 13, 2013 (Plug In America)

    Introduction

    As the first full-production all-electric vehicle of the modern era, the Tesla Roadster represents a unique opportunity to study battery pack longevity. Deliveries of the vehicles began in 2008 with a total of 2,500 Roadsters produced through the end of production in January, 20121. As of July 4, 2013, Tesla Motors reports that “2,100+ Roadsters” have been driven over 35 million miles.

    .

    For this study, Tesla Roadster owners were contacted via social media including the Tesla Motors Club and various other online groups and asked to submit data for their vehicles. As of July 5, 2013, 126 vehicles totaling 3,198,749 miles have contributed to the survey, amounting to approximately 5% of the user base and nearly 10% of the miles driven as reported by Tesla Motors. In addition, data from 106 Roadsters was collected anonymously through the Open Vehicle Monitoring System (OVMS), with considerable overlap expected between the two data sets.

    In 2006, Tesla Motors projected that the Roadster battery pack would have more than 100,000 miles of driving range and more than 5 years of useful life. Over this period, the capacity of the battery pack would be expected to decline. As an example, a Roadster driven 10,000 miles per year for 5 years would be expected to have 70% of the original battery pack capacity.

    The purpose of this study is to determine how the battery packs are holding up and how real world performance compares to the expectations set by Tesla Motors in the timeframe when the Roadster was first announced and described in 2006.

    Summary of Results

    Of the factors considered – miles driven, vehicle age, and climate – only mileage showed a significant correlation with battery pack capacity.

    Data collected suggests that, on average, a Roadster battery pack will have between 80% and 85% of original capacity after 100,000 miles.

    Unlike results from the Plug In America LEAF Battery Survey, no significant correlation was found between climate and battery longevity.

    There is significant variation in battery capacity reported; the difference in capacity between vehicles with similar mileage can be as large as the projected loss over 100,000 miles of use. Individual owners should therefore expect variation between their experience and the projected average performance.

    Because of the variation in battery pack longevity experienced by owners, especially where such variation may be due to factors beyond the owners’ control, it would seem desirable for the manufacturers of electric vehicles to guarantee not only the life of the battery pack, but also the capacity performance over time and miles. Nissan Motors responded to the climate issues reported by LEAF owners (and confirmed by the Plug In America study) by amending their battery warranty to cover capacity. With the performance of the Roadster battery packs exceeding early expectations, it’s curious that Tesla Motors doesn’t offer any capacity warranty, even on the 85 kWh Model S, which has a warranty good for 8 years and unlimited miles…

    Conclusions

    The projections from the various data sets studied suggest that Roadster batteries will be at 80% to 85% capacity after 100,000 miles, on average. Stated another way, the study shows an average loss of about 3.7 ideal miles of range (1.6%) per 10,000 miles driven. As there is considerable variation among vehicles with similar mileage, an individual owner’s experience may vary significantly from the average.

    The survey found no significant correlation between climate and battery pack longevity. Individual experience may vary. The survey data for high-mileage vehicles is sparse with little variation in climate among those vehicles, so it’s possible an effect from climate will emerge as more data is collected.

    The survey found no significant correlation between vehicle age and battery pack longevity, although the study has no data on the first year of use, nor use beyond 4.5 years.

    The calculated amp-hour capacity is the most reliable measure of battery pack capacity. It would be a benefit if this value were readily visible to Roadster owners.

    It’s curious that Tesla does not offer any sort of warranty on battery pack capacity, not previously as part of a new Roadster purchase, not as part of the extended warranty they are now offering Roadster owners as their warranties expire, and not even to Model S owners despite the purported improvement in battery chemistry and corresponding increase in both time and miles on the Model S battery warranty…

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