Tech Briefs Magazine - December 2023 - BET-17

document because of some of the
intricacies that are there from a communication
protocol, etc. and technical
statements that are in there just so we
don't repeat ourselves.
McGee: It's important to remember
that J1772 is also used in Japan and
South Korea. There's no indication at
the moment that's changing. There are a
number of other smaller countries that
may continue to use that plug and even
if over time the plug becomes more common,
it's a lot of the descriptions of things
that live in J1772 that may continue to be
described within that document.
Brulte: What is the impact of NACS on
commercial vehicles, say Class 6 through
Class 8?
McGee: SAE has Ground Vehicle standards
and under that are the Truck
and Bus Council and the Motor Vehicle
Council. The NACS Task force lives under
Motor Vehicle Council. I also have standards
that I work on in Truck and Bus.
One of the things that come out of this
discussion is a good analogy: if you've
ever gone to one of those stations that
service tractor-trailer [Class 8] trucks,
you know that they have bigger filling
nozzles because those vehicles need
quicker energy delivery, via diesel in
those cases.
They
[commercial-vehicle interests]
want higher-power DC charging, that's
megawatt. SAE has a megawatt-level DC
charging standard, focused on those vehicles
for plugin charging. A couple of years
ago, SAE published overhead-charging
non-handheld couplers, and the J3105
series, which is basically about electrifying
city buses and vehicles like this. For
DC charging, [generally] we want higher
power levels than the passenger-car market,
because we have batteries that are
three and four times bigger.
Those vehicles may have goods, sometimes
millions of dollars' worth of goods
on them. They can't fail. They need to get
to their destination. That is one of the legitimate
reasons that those vehicles generally
lag behind passenger-car [change
and innovation], because the truck sector
wants [equipment] that's known reliable
and that's well-understood.
Even though there's been some
high-profile deployments of vehicles like
electric school buses, they're really leveraging
passenger-car standards. A city
bus, we pretty much drive these buses
23 hours a day, so we need overhead
charging at above a megawatt. It's really
about the truck and bus [interests]
deciding to electrify and then figuring
out how they get there from here and
making standards that sort of enable the
mass deployment.
To listen to the full episode of the podcast,
visit https://tinyurl.com/yckefu9e. 
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Tech Briefs Magazine - December 2023

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