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Tesla Semi battery weight criticisms are rooted in outdated ideas: EV expert

The Tesla Semi visits Yandell Truckaway. (Photo: Arash Malek)

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4 years ago

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A good number of skeptics critical of battery-electric long-haulers like the Tesla Semi typically argue that the weight of the vehicles’ batteries makes them ineffective against competitors that are powered by diesel or hydrogen. As noted by an electric vehicle veteran and expert recently, however, these ideas are rooted in outdated ideas about battery weight. And if one considers more recent battery tech, electric Class 8 trucks may not only be feasible; they may actually be closer than expected. 

In a recent piece on Bulk Distributor Magazine’s November/December 2020 issue, Auke Hoekstra, Senior Advisor for Electric Mobility at the Eindhoven University of Technology, noted that contrary to popular belief, long-haul trucks would not be the last vehicles to become battery-powered. This is in no small part due to the advancement of battery technology. Hoekstra noted that within five years, he believes that “electric trucks will become the logical choice for many bulk transporters” And within 10 years, vehicles like the Tesla Sei will likely dominate new sales. 

The stunning progression of battery technology could be seen in just how much batteries have gotten better and cheaper over the years. Hoekstra noted that myths about electric trucks being too heavy were true 20 years ago, but not today. If electric long-haulers existed 20 years ago, they would likely be powered by lead-acid batteries, and assuming a battery size of 1 MWh, such a vehicle will require a pack that will likely weigh about 25 tons. That’s more than the entire payload of the truck. This is, of course, not the case today. 

Hoekstra noted that when he wrote his first book about electric vehicles for the Dutch Ministry of Road Transport 13 years ago, lithium-ion batteries had started to emerge. Lithium-ion batteries offered reductions in weight, resulting in a 1 MWh pack weighing only about 10 tons. Today, this is even better, with modern electric cars having batteries that weigh about 5 kg per kWh or 5 tons per MWh. “I expect that with five years, that weight will be down to 3.5 tons. And it doesn’t stop there,” the EV veteran wrote. 

Class 8 trucks like the Tesla Semi, which are designed from the ground up to be electric, will likely offer even better weight advantages. Hoekstra estimated that Tesla would see further weight reductions of about 2.5 to 3 tons due to the vehicle’s all-electric platform. “The electric motor is lighter, and you can get rid of the diesel tank and exhaust treatment. Then you place the electric motors between the wheels and lose the differential, driveshaft, and a host of other components,” he wrote. 

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What’s particularly interesting is that these estimates don’t even take into account the innovations that Tesla unveiled in its Battery Day event. Once Tesla’s 4680 tabless cells and structural battery packs enter the equation, the Semi becomes an even more compelling alternative to diesel-powered trucks. Hoekstra estimated that Tesla’s structural battery packs could save another ton to the Semi’s overall weight, seeing as the battery would practically displace the steel beams that give traditional Class 8 long-haulers their rigidity. With this in mind, the EV veteran noted that “battery weight will soon be a problem of the past.” 

There are other advantages to electric trucks that were highlighted by Hoekstra in his piece, such as the cost savings that will result from the use of a fleet of electric trucks. This is something that Tesla has highlighted in the past, with CEO Elon Musk stating during the vehicle’s unveiling that the Semi will vastly undercut diesel-powered rivals when it comes to operating costs. Couple this with the low maintenance requirements of EVs, as well as the fact that batteries now last much longer, and trucks like the Tesla Semi will likely become very attractive options for operators in the very near future. 

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Simon is an experienced automotive reporter with a passion for electric cars and clean energy. Fascinated by the world envisioned by Elon Musk, he hopes to make it to Mars (at least as a tourist) someday. For stories or tips--or even to just say a simple hello--send a message to his email, simon@teslarati.com or his handle on X, @ResidentSponge.

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Tesla doubles down on Robotaxi launch date, putting a big bet on its timeline

Tesla continues to double down on its June goal to launch the Robotaxi ride-hailing platform.

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10 hours ago

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April 18, 2025

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Credit: Tesla

Tesla has doubled down on its potential launch date for the Robotaxi ride-hailing platform, which will utilize the Cybercab and other vehicles in its lineup to offer driverless rides in Austin, Texas.

Tesla said earlier this year that it was in talks with the City of Austin to launch its first Robotaxi rides, and it planned to launch the platform in June.

This has been a widely discussed timeline in the community, with some confident in the company’s ability to offer it based on the progress of the Full Self-Driving suite.

However, others are skeptical of it based on Tesla’s history of meeting timelines, especially regarding its rollout of FSD.

Nevertheless, Tesla was asked when it would be able to offer Robotaxi rides and where, and it clearly is not backing down from that June date:

It is getting to a point where Tesla is showing incredible confidence regarding the rollout of the Robotaxi in June. We have not seen this kind of reiteration regarding the rollout of something regarding autonomy from Tesla at any point in the past.

CEO Elon Musk has even been increasingly confident that Tesla will meet its target. Earlier this week, he said the vehicles will be able to roll off production lines and drive themselves straight to a customer’s house:

Elon Musk continues to push optimistic goal for Tesla Full Self-Driving

There could be some discussion of an acceptable grace period, as the timeline for the Robotaxi rollout could still be considered a success, even if it were a month or two late. However, if it were pushed back further into 2025 or even 2026, skepticism regarding these timelines would continue to persist.

As of right now, it seems Tesla is extremely confident it will meet its goal.

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Tesla Semi fleet from Frito-Lay gets more charging at Bakersfield factory

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12 hours ago

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April 18, 2025

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Tesla Semis showcased at Frito-Lay plant in Modesto, CA
Frito-Lay transformed its Modesto, Calif., site by replacing diesel fleet assets with ZE and NZE alternatives and installing fueling and charging infrastructure for the new fleet as well as on-site renewable energy generation and storage.

Among the several companies that have had the opportunity to add Tesla Semi all-electric Class 8 trucks to their fleets earlier than others, the most notable is arguably Frito-Lay, which has utilized the vehicle for a couple of years now.

However, as their fleet is making more local runs and there are undoubtedly plans to expand to more Semi units, the company has recognized it needs additional Megachargers to give juice to their trucks.

As a result, Frit-Lay decided to build more chargers at their Bakersfield, California facility, according to new permits filed by Tesla:

There are already chargers at the company’s Modesto, California, factory, but Bakersfield is roughly three hours south of Modesto.

Interestingly, Tesla is calling the chargers “Semi Chargers” in the filing, potentially hinting that it is no longer referring to them as “Megachargers,” as they have been in the past. This is a relatively minor detail, but it is worth taking note of.

In 2022, Frito-Lay began installing these chargers in preparation for the Semi to become one of the company’s main logistics tools for deliveries in California and surrounding states.

Frito-Lay is not the only company that has chosen to utilize the Tesla Semi for these early “pilot” runs. PepsiCo has also been a company that has used the Semi very publicly over the past two years.

Additionally, the Tesla Semi participated in the Run on Less EV trucking study back in late 2023, where it managed to complete a 1,000-mile run in a single day:

Tesla Semi logs 1,000-mile day in Run on Less EV trucking study

Tesla is planning to ramp production of the Semi late this year. On the Q4 2024 Earnings Call, VP of Vehicle Engineering Lars Moravy said the company would be focusing on the first builds of the Semi’s high-volume design late this year before ramping production in the early portion of 2026:

“We just closed out the Semi factory roof and walls last week in Reno, a schedule which is great with the weather. In Reno, you never know what’s going to happen. But we’re prepping for mechanical installation of all the equipment in the coming months. The first builds of the high-volume Semi design will come late this year in 2025 and begin ramping early in 2026.”

Tesla will build these units at a new Semi production facility located in Reno near its Gigafactory. The company is getting closer to finishing construction, as a drone video from this morning showed the facility is coming along at a good pace:

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Tesla Cybercab no longer using chase vehicles in Giga Texas

Elon Musk expects Tesla to produce about 2 million Cybercab units per year.

Published

13 hours ago

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April 18, 2025

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Credit: Joe Tegtmeyer/X

The Tesla Cybercab is the company’s first vehicle that is designed solely for autonomous driving. And while the spacious two-seater is expected to start volume production in 2026, the vehicle’s development seems to be moving at a steady pace.

This was hinted at in recent images taken by a longtime Tesla watcher at the Giga Texas complex.

Tesla Cybercab Production

The Cybercab will likely be Tesla’s highest volume vehicle, with CEO Elon Musk stating during the company’s Q1 2025 All-Hands meeting that the robotaxi’s production line will resemble a high-speed consumer electronics line. Part of this is due to Tesla’s unboxed process, which should make the Cybercab easy to produce.

Elon Musk expects Tesla to produce about 2 million Cybercabs per year. And while the vehicle is expected to see volume production at Giga Texas next year, the CEO noted that the vehicle will be manufactured in more than one facility when it is fully ramped.

No More Chase Cars

While the Cybercab is not yet being produced, Tesla is evidently busy testing the vehicle’s fully autonomous driving system. This could be hinted at by the Cybercabs that have been spotted around the Giga Texas complex over the past months. Following last year’s We, Robot event, drone operators such as longtime Tesla watcher Joe Tegtmeyer have spotted Cybercabs being tested around the Giga Texas complex.

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At the time, videos from Giga Texas showed that the driverless Cybercabs were always accompanied by a manually driven Model 3 validation chase car. This was understandable considering that the Giga Texas complex features pedestrians, other cars, and construction areas. As per the drone operator in a recent post on social media platform X, however, Tesla seems to have stopped using chase cars for its Cybercab tests a few weeks ago.

Aggressive Tints

The reasons behind this alleged update are up for speculation, though it would not be surprising if the Cybercab’s autonomous driving system could now safely navigate the Gigafactory Texas complex on its own. Interestingly enough, the Cybercabs that were recently photographed by the drone operator featured very aggressive tint, making it almost impossible to make out the interior of the robotaxi.

This is quite interesting as other Cybercabs that have been spotted around Giga Texas were only equipped with semi-dark tints. One such vehicle that was spotted in February was even speculated to be fitted with an apparent steering wheel.

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