Published on September 28th, 2020 |
by Paul Fosse
September 28th, 2020 by Paul Fosse
As soon as I saw Tesla’s Battery Day, I became impressed with both the breadth and the depth of the conception they equipped. It lined the total formula of the battery, but moreover how the battery is placed in the automobile. The one question it raised became: “Did they set their in reality intensive engineering abilities into solving the correct space?”
I mediate the reply is sure, but attributable to my work on specializing in the total fee of ownership of the electric autos, I knew Tesla became lacking a huge different by no longer spending any engineering effort on tires. Many of the controversy on tires is either on bettering effectivity or on bettering efficiency, but for 90% of the field, the mammoth topic is the fee of the tires. On this text, I’ll existing the scale of the space and propose 3 solutions to the space.
I estimate the associated fee of per kWh of the battery pack to be about $158 this day, and if we retract Tesla achieves its talked about 56% fee reduction goal, the firm can be ready to originate a pack at about $69 a kWh. For a runt 50kWh pack former for a robotaxi, this may perchance well be $3,450 and it would perchance maybe doubtless exercise lithium-iron-phosphate batteries for his or her long cycle lifestyles (let’s correct name that a million-mile battery). So, for exercise in a robotaxi the put it will experience a million miles, the associated fee of the battery per mile is $3,450 divided by 1,000,000, or 0.345 cents a mile, grand decrease than a penny a mile.
If you correct substitute the tires for your Mannequin 3 with the tires it came with, tires charges are a considerably higher fee than the battery over the lifetime of the automobile. The Tesla Mannequin 3 Long-established Vary Plus (SR+) comes with Michelin Primacy MXM4 tires which hold a treadwear ranking of 500, a traction ranking of A, and a temperature ranking of A (500AA). You should always soundless procure spherical 40,000 miles out of those tires, with a fee on Simpletire of $276. Add on native set up and a road hazard warranty and it comes to about $1,358 for 4 tires. $1,358 divided by 40,000 is set 3.4 cents a mile, or about 10 times as grand as battery charges! Over a million miles, 24 tire changes would be wanted and that can add as a lot as $32,592! Holy cow — why are we terrified about battery charges when tires charges are projected to be so grand higher?
Perchance on fable of battery fee is a fee that hits you at purchase time, whereas tire charges hit you down the road. It would perchance maybe also moreover be that we’re hooked in to working on the diversities between electric autos and gasoline autos. Nonetheless, the customer doesn’t care the put fee financial savings come from, they correct settle on decrease charges.
One part I’ve learned from 30 years of efficiency tuning tool: you may perchance well maybe be ready to simplest build time and sources the put they are former. It sounds easy, but frequently folks originate assumptions (like Tesla did with Battery Day that the space is in the associated fee of making the battery, when the far higher topic is in the associated fee of the tires).
Step 1 — Store spherical
Step one may perchance well also also be carried out by shoppers without any back from Tesla. Simpletire’s best doubtless-rated tire for the Tesla Mannequin 3 with 18 wobble wheels is the South Korean made Lexani LXUHP-207, with the equal 500AA ranking for $83 a tire. Together with set up and road hazard coverage for 4 tires comes to $470. (If we took off the road hazard coverage, we would also procure to $420, which is a very normal number with Tesla fans.) $470 divided by 40,000 miles is set 1.2 cents a mile, for a 65% financial savings.
Step 2 — Screech a smaller wheel size
Twenty-5 years prior to now, I saw a tire advert for some tires with a 30,000-mile warranty marketed for $12.99 a tire. I drove to the Sear’s retailer that became marketing the tires and talked about I wanted the $12.99 tire. They answered, “That is the associated fee for the tire for the 12-wobble wheel, the associated fee to your automobile can be about $30 or $40 a tire.” I talked about I pressure a Toyota Tercel with 12-wobble wheels and that 12-wobble tire will work completely for my automobile. They had been nervous. I don’t mediate that they had ever equipped the $12.99 tires. I drove out of the retailer having spent decrease than $50 for 2 tires, mounted and balanced!
Now, Tesla would hold to scheme the brakes to be smaller so we would also exercise a 17-wobble wheel with a higher facet ratio. This received’t be acceptable for heaps of interior most autos on fable of the handling received’t be as aesthetic and the looks of the automobile will suffer, alternatively it’d be enormous for a robotaxi for 3 reasons.
- Lower tag
- Higher proof against potholes
- Smoother experience
The tag of the Canadian constructed tire is diminished from $470 to $364 by this swap, but since the decrease efficiency tire has a extra grand compound, it is warranted for 50% extra miles. So, the associated fee per mile of $364 divided by 60,000 miles is $0.006 a mile, or 50% decrease than the Lexani. We are now up from a 65% financial savings to a 82% financial savings!
The trucking swap has been the usage of retreated tires for over 50 years to construct money and pure sources. Based entirely on tirerecappers.com, regarding the benefits of retreads:
“First, it keeps your destroy down, and ensures that your tires aren’t being thrown onto the heap alongside with hundreds of others in dumps and landfills across the country. 2nd, getting a retread tire is considerably less pricey than attempting to fetch a be aware unusual tire, as they’re less pricey to originate, and exercise considerably fewer materials.”
The retreading huge Bandag became one of many first shares my father purchased for me as barely one. (I no longer maintain the inventory.) It became a mammoth winner in the 1970s. Based entirely on Bandag’s Environmental Sustainability Online page:
“More than 800 tires per hour are retreaded with Bandag. In a year, this helps encourage roughly seven million tires out of the destroy traipse.
“Bandag retreads require correct 30% of the vitality to originate as a unusual tire.
“Making a Bandag retread takes simplest seven gallons of oil, in comparison to 22 gallons required to procure a unusual tire.
“Lots of Bandag franchisees are taking fair correct thing about different vitality corresponding to photo voltaic vitality.
“Bandag FuelTech products provide about a of the bottom rolling resistance in the swap, which contributes to gasoline effectivity gains, guaranteeing that the environmental benefits of our retreads prolong well beyond the production line.”
Bandag became very a hit at increasing its sales and increasing its profits, and for aesthetic cause, it saves industrial users 50% to 70% of the associated fee of most up-to-date tires without reducing quality. If we are able to adapt retread abilities to decrease charges by 50%, that can minimize the associated fee per mile from 0.6 cents a mile to 0.3 cents a mile. Since this received’t decrease set up charges, let’s retract a 43% reduction to 0.34 cents a mile. This would give us a whopping 90% fee reduction from the distinctive 3.4 cents a mile!
I am hoping this text spurs a discussion in the land of tires and helps Tesla and its owners put about $29,000 in financial savings over a million miles versus the $4,400 detailed in Tesla’s Battery Day presentation. That is over 6.5 times the financial savings. There can be some engineering required, but fervent in the massive fee financial savings, it is completely price the hassle.
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About the Creator
Paul Fosse A Instrument engineer for over 30 years, first establishing EDI tool, then establishing data warehouse systems. Alongside the strategy, I’ve moreover had the risk to back open a tool consulting company and put portfolio management. In 2010, I took an hobby in electric autos on fable of gas became getting pricey. In 2015, I started reading CleanTechnica and took an hobby in photo voltaic, totally on fable of it became a threat to my oil and gas investments. Follow me on Twitter @atj721 Tesla investor. Tesla referral code: https://ts.la/paul92237