Why you might be charging your EV wrong – and what to do instead
Many EV drivers carry over habits from driving gasoline cars when they charge EVs, but that leads to wasted time, inconvenience, and range anxiety, according to a new study.
Professors Frances Sprei of Sweden’s Chalmers University and Willett Kempton of the University of Delaware are EV technology and usage experts. They interviewed EV users in both Sweden and the US and found unanticipated and previously unreported EV charging habits and ideas.
Their study, “Mental models guide electric vehicle charging,” in April’s edition of the peer-reviewed journal Energy, found that novice EV drivers, and even those who had months of EV driving experience, use a “monitor gauge” mental model: They monitor the battery charge gauge while driving, and when the gauge is low, head to an EV charging station to recharge, as a gas car driver would at a gas station.
In contrast, the study found that a few experienced EV drivers had developed a strategy of
using a trigger event to spur them to plug in their EV.
Kempton said:
Some of the more sophisticated EV users had picked a repeating event that happens at a place they can plug in and at a time or event lasting several hours. This is commonly when returning home at the end of the day or arriving at work.
A few people had selected unexpected triggers, such as shopping, and for one, when walking his dog in the evening.
Users with the “event-triggered” mental model respond to their selected event by plugging in without the need to make decisions on a daily basis. This model means that the driver will likely plug in even if it’s not needed, but interviewees’ feedback suggested that’s worth it not to have to make charging decisions:
“Which trips do I need to take tomorrow?”
“Are tomorrow’s trips less than the miles shown on the gauge now?”
“How likely is an unexpected trip tomorrow?”
The researchers also found a “planning” mental model for taking road trips in an EV. This third model is used only when a driver needs to take a trip longer than their battery range, so they have to plan for DC fast charging availability. Most drivers take longer road trips just a few days a year, but, the authors note, DC fast charging consumes most of the attention in planning EV charging station infrastructure.
The article points out that the problem with using the old “monitor gauge” model is that EV recharging and gasoline refueling require different strategies.
Refueling with gasoline takes only a few minutes, and one has to drive to or stop at a gas station.
By contrast, it can take hours to charge an EV with a Level 1 or 2 charger, and that can be done at home, work, or other places where one is parked anyway. If recharging is started at the right time and place, it takes only seconds to plug in.
Thus, each mental model is well adapted for one fuel but not the other.
Experienced EV drivers who had developed the “event-triggered” model didn’t complain
about range anxiety, inconvenience, or waiting to charge. Rather, the study quotes them saying the following about charging:
“[Recharging] is very practical … Even if you do it every day, it’s a routine thing.”
“The EV is much more convenient … You just put a cord in the wall instead of having to drive to a gas station and refuel and so on.”
“It was pretty nice not to have to refuel. Or rather, one refuels every evening. But one doesn’t have to think about it other times, somehow.”
Sprei said, “One of the implications of our results is that prospective EV buyers, as well as policymakers, should focus on securing access to charging close to home. If you are an EV buyer, you are not just buying a car.”
She added, “The old ‘monitor gauge’ mental model may also lead to a suboptimal oversizing of batteries that causes higher purchasing costs and excess vehicle weight.”
Read more: Volvo Cars says its new partner will reduce its EVs’ charging time by 30%
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EV sales kept up their momentum in December 2024, with incentives playing a big role, according to the latest Cox Automotive’s Kelley Blue Book report.
December’s strong EV sales saw an average transaction price (ATP) of $55,544, which helped push the industry-wide ATP higher, according to Kelley Blue Book. The December ATP for an EV was higher year-over-year by 0.8%, slightly below the industry average, and higher month-over-month by 1.1%. Tesla ATPs were higher year-over-year by 10.5%.
Incentives for EVs remained elevated in December, although they were slightly lower month-over-month at 14.3% of ATP, down from 14.7% in November.
EV incentives were higher by an impressive 41% year-over-year and have been above 12% of ATP for six consecutive months. Strong sales incentives, which averaged more than $6,700 per sale in 2024, were one reason EV sales surpassed 1.3 million units last year, according to Cox Automotive, a new record for volume and share.
(My colleague Jameson Dow reported yesterday, “In 2024, the world sold 3.5 million more EVs than it did in the previous year … This increase is larger than the 3.2 million increase in EV sales from the previous year – meaning that EV sales aren’t just up, but that the rate of growth is itself increasing.”)
Kelley Blue Book estimated that in December, approximately 84,000 vehicles – or 5.6% of total sales – transacted at prices higher than $80,000 – the highest volume ever. KBB lumps gas cars and EVs together into this luxury vehicle category, so this is where Tesla Cybertruck is slotted.
However, Tesla bundles sales figures of Cybertruck with Model S, Model X, and Tesla Semi(!) into a category it calls “other models,” so we don’t know for sure exactly how many Cybertrucks Tesla sold in Q4, much less in December. However, Electrek‘s Fred Lambert estimates between 9,000 and 12,000 Cybertrucks were sold in Q4, and that’s not a stellar sales figure.
What will January bring when it comes to EV ATPs? What about tax credits? Check back in a month and I’ll fill you in.
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Tesla is now claiming that Cybertruck was the ‘best-selling electric pickup in US’ last year despite not even reporting the number of deliveries.
There’s a lot of context needed here.
As we often highlighted, Tesla is sadly one of, if not the most, opaque automakers regarding sales reports.
Tesla doesn’t break down sales per model or even region.
For comparison, here’s Ford’s Q4 2024 sales report compared to Tesla’s:
You could argue that Tesla has fewer models than Ford, and that’s true, but Tesla’s report literally has two lines despite having six different models.
There’s no reason not to offer a complete breakdown like all other automakers other than trying to make it hard to verify the health of each vehicle program.
This has been the case with the Cybertruck. Tesla is bundling its Cybertruck deliveries with Model S, Model X, and Tesla Semi deliveries.
Despite this lack of disclosure, Tesla has been able to claim that the Cybertruck has become “the best-selling electric pickup truck” in the US in 2024:
It very well might be true. Ford disclosed 33,510 F-150 Lightning truck deliveries in the US in 2024 while most estimates are putting Cybertruck deliveries at around 40,000 units.
Those are global deliveries, but Tesla only delivered the Cybertruck in the US, Canada, and Mexico in 2024, and most of the deliveries are believed to be in the US.
However, there’s essential context needed here, as we highlighted in our recent ‘Tesla Cybertruck sales are disastrous‘ article.
First off, Tesla had a backlog of over 1 million reservations for the Cybertruck that it has been building since 2019. This led many to believe Tesla already had years of demand baked in for the truck and that production would be the constraint.
However, based on estimates, again, because Tesla refuses to disclose the data, Cybertruck deliveries were either flat or down in Q4 versus Q3 despite Tesla introducing cheaper versions of the vehicle and ramping up production.
Again, that’s after just about 40,000 deliveries.
Furthermore, with almost 11,000 deliveries in Q4 in the US, Ford more likely than not outsold Cybertruck with the F-150 Lightning in Q4.
Electrek’s Take
Tesla is in damage control here. There’s no doubt that it is having issues selling the Cybertruck.
Inventory is full of Cybertrucks and Tesla is now discounting them and offering free lifetime Supercharging.
Tesla is great at ramping up production, and it’s clear the Cybertruck is not production-constrained anymore. It is demand-constrained despite having over 1 million reservations.
Again, those reservations were made before Tesla unveiled the production version, which happened to have less range and cost significantly more.
The upcoming cheaper single motor version should help with demand, but I have serious doubts Tesla can ramp this program up to more than 100,000 units in the US.
As a reminder, Tesla installed a production capacity of 250,000 units annually and Musk said he could see Tesla selling 500,000 Cybertrucks per year.
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