Disclaimer. After nearly 40 years managing money for some of the largest life offices and investment managers in the world, I think I have something to offer. These days I'm retired, and I can't by law give you advice. While I do make mistakes, I try hard to do my analysis thoroughly, and to make sure my data are correct (old habits die hard!) Also, don't ask me why I called it "Volewica". It's too late, now.

BTW, clicking on most charts will produce the original-sized, i.e., bigger version.

Monday, April 30, 2018

Less than 10% battery degradation over 160,000 miles

One of the big worries about electric cars has been that one would have to replace the battery after only a few years, which would be very costly.  This worry was made more real by the performance of the early Leafs.  But we now have more data from older Teslas, and it seems that only about 10% of the battery's capacity is lost by 180,000 miles (290,000 kms)  The average car is driven 12,000 miles (about 19,000 kms) per year, so this means that you'd get a minimum of 15 years from your Tesla battery.  And then you'd be able to sell it for use as a battery for a house or small business.  Try doing that with a 15 year old car engine or drive-train!

Battery life is improved by not charging to 100% or discharging to zero except occasionally or in emergencies.  Musk himself says that charging to a max of 80% and never going below 30% prolongs battery life.  Tesla has software which discourages overcharging and over discharging.

Tesla Model S/X Mileage vs remaining battery capacity
Source: Electrek

[Read more here]

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