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BYD Co. Unveiled a new very rapid electric vehicle charge system. NECESSARY?

 

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David has provided a very insightful overview of the non-technical aspects of BEV dcfc, i.e., the psychology of people.

Psychology aside, I will add to that the "mathematical" aspect of taking BEV trips and that the need for very rapid dcfc charging (>100kW, recognizing that many present cars are in the 150kW-250kW range), is unnecessary.

I am specifically excluding the needs of multi-unit dwellers who have challenges in their everyday charging needs, anyway.

We're not talking about average US daily trips of ~35 miles which my 13-year-old i-MiEV (original EPA range 62 miles) continues to satisfy admirably on one charge. We need to accept the fact that almost all current BEVs have sufficient range to accommodate most Bay Area round-trip drives on a single charge, and thus dcfc charging speed is a moot point.

I will suggest the unusual example where one's car is not charged (why not keep it at 60%?) and all of a sudden one needs to drive to the North Bay from the South Bay, and back, with no opportunity to charge at the North Bay destination (why not?). Ok, we have plenty of dcfc stations in the Bay Area and a quick 15-minute stop for a bathroom break and a cup of coffee with no waiting time will invariably be sufficient to get home. This example accounts for perhaps less than 5% of all of one's driving.

Now, for longer trips, say from the Bay Area to Los Angeles or Medford, Oregon, each around 400 miles one way, I contend that inordinately-high dcfc charging speed is also not required:

? Start in the morning with a full tank.
? Drive for a couple or three hours and stop at a dcfc and plug in immediately. Go to the bathroom and grab a coffee and get back to the car and unplug it. That was just a 10-15 minute stop.
? Get back on the road and drive for a couple of more hours.?
? Stop for lunch at a dcfc and have a leisurely lunch - the car will get sufficiently (>80%) charged before you've finished eating.
? Rinse and repeat in the afternoon. Bingo! 400 miles just driven.

On the road, any time you stop be sure to plug the car into something. When road-tripping, the goal is to never ever have to wait for the car to charge. Hey, if nothing else, go for a walk (much needed when on the road). The last thing you want to do is sit in the car and catch up on all your smartphone activities as, if you do that, I contend that you are not waiting for the car to charge, but vice-versa!

Now, if you want to drive a 750-mile day, that's also doable but requires some planning and break optimization. A nice math puzzle balancing a few more variables and often relying on keeping the car at a low SoC to maximize the amount of energy replenished in the shortest amount of time. How often do people need to do this and is this a prerequisite to purchasing a car with a super-rapid dcfc capability?

Enough, as I believe it is up to us to educate non-EV owners (and, as I've found out, existing EV owners) about the realities of taking extended EV trips and adjusting charging appropriately. We need to make the paradigm-shift away from the gas-station model painless!

(flame suit on) :-)

Joe Siudzinski

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On Mar 18, 2025, at 20:54, David Sooby via groups.io <lensman03@...> wrote:

On Mon, Mar 17, 2025 at 4:52?PM T.Kim Parnell via <kim.parnell=stanfordalumni.org@groups.io> wrote:
On a trip, faster charging is very important.
Kim Parnell?

Yes, exactly.? Sure, a lot of us (perhaps most) EV supporters consider "Your car can charge while you're sleeping or doing other things" to be a very important selling point.

But here's what I've read about the psychology of people choosing their "daily driver" vehicle:? They will choose a vehicle which they think will do everything they need it to, 98-99% of the time.? (People don't buy moving vans as their daily driver, because 99%+ of the time they don't need to haul around that much stuff.)

Driving on long trips is seen by the average car buyer as included in that 98-99% of things they need the car to do.? So for the average car buyer, the fact that current state-of-the-art EVs can NOT be quickly charged en route, is an important factor in deciding what car to buy... and what car NOT to buy.

If the state-of-the-art gets to where people can reliably charge their BEV en route in 10 minutes or less, I think we will see a LARGE upswing in demand for BEVs.? That needs not only cars which can be charged much faster, but also widespread charging infrastructure capable of supporting much faster charging.

~~~~~~~~~~
Electric cars forever!
David Sooby
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