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Tesla shares 48V architecture with other automakers

electrek.co

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Re: Tesla shares 48V architecture with other automakers

#231

Post by dreamcompiler »

Moto7451 wrote: post #189

Audi also has a 48v architecture in use for mild hybrids like my SQ5. This is an older article but explains it well https://www.greencarcongress.com/2017/06/20170602-audi.html My 2021 is fully 48v except for an inverter for necessary 12v circuits (like cigarette outlets and the jumper pins) and a small motorcycle battery that is used for minimal 12v functionality. The mild hybrid battery is under the rear seats and s…

> except for an inverter for necessary 12v circuits

Nitpick: That's a DC-DC converter, not an inverter.

Re: Tesla shares 48V architecture with other automakers

#232

Post by bhauer »

Moto7451 wrote: post #189

Audi also has a 48v architecture in use for mild hybrids like my SQ5. This is an older article but explains it well https://www.greencarcongress.com/2017/06/20170602-audi.html My 2021 is fully 48v except for an inverter for necessary 12v circuits (like cigarette outlets and the jumper pins) and a small motorcycle battery that is used for minimal 12v functionality. The mild hybrid battery is under the rear seats and s…

> My guess is that handing this out is a very nice thing to do but perhaps irrelevant in a world where 400v and 800v drive systems are the state of the art.

The high-voltage system for the drive motors, whether 400V or 800V, is unrelated to the low-voltage system for accessories. The transition from 12V to 48V is concerning the low-voltage system. Prior to the Cybertruck, no automobile ever had a fully 48V low-voltage system. To learn more about how this is a big deal, check out Jason Cammisa's video on the subject. I've cued it to the specific topic in the [1] link below.

[1] https://youtu.be/L6WDq0V5oBg?si=dbzsPMAkvmGiQQ8n&t=613

Re: Tesla shares 48V architecture with other automakers

#233

Post by Geee »

jrockway wrote: post #179
jnsaff2 wrote: post #83

The "expert" in the article got it wrong. The relationship between the voltage and the losses in the wires is not proportional. They are squared. Going from 12V to 48V is not a saving of 4x rather 16x. For some applications you could also consider Power over Ethernet in the car, get both shielded comms and power. Or can and power over twisted pair.

> Or can and power over twisted pair. I was reading an anti-Musk subreddit over on Reddit and I think the cybertruck is doing this? They were mad that the cybertruck uses 48V and Ethernet cables, but to me, that seems perfect for CAN and power. We already use 48V (or similar) for PoE, and CAN needs a twisted pair... so why not buy that off the shelf instead of using a custom wiring harness? I don't think the cybertru…

Yeah, Elon talked about this in his latest interview with Munro. It seems that they just use Ethernet rather than CAN bus.[0]

[0] https://youtu.be/ky1Z2klPalw?t=791

Re: Tesla shares 48V architecture with other automakers

#234

Post by rasz »

dududhxhd wrote: post #155
jmrm wrote: post #141

>48V architecture also potentially improves overall electrical efficiency for reasons that I am not sufficiently qualified to explain beyond a kindergarten level This is double bad in a green energy and EV website: On one hand, they admit they don't now why that happens, but on the other hand, they also didn't research just a bit more on that, and that's bad journalism. Most of the comment threads in this HN post are…

Nonsense. It’s a bit of self deprecating humor and gives readers enough information to follow along.

"Before joining Electrek, David was a mobile technology journalist for over a decade at Android Police, where he started as a writer and went on to serve as Editor-in-Chief. He later accepted a side quest in the world of startup marketing, heading up content and product marketing initiatives at two SaaS companies."

Re: Tesla shares 48V architecture with other automakers

#235

Post by dreamcompiler »

gleenn wrote: post #212
Moto7451 wrote: post #189

Audi also has a 48v architecture in use for mild hybrids like my SQ5. This is an older article but explains it well https://www.greencarcongress.com/2017/06/20170602-audi.html My 2021 is fully 48v except for an inverter for necessary 12v circuits (like cigarette outlets and the jumper pins) and a small motorcycle battery that is used for minimal 12v functionality. The mild hybrid battery is under the rear seats and s…

My understanding was that nearly every production vehicle on the road is 12V and that Tesla and perhaps Audi as you mentioned are doing things differently. Who is using 400-800V systems? That sounds extremely dangerous.

Tesla uses 800v only to run the Cybertruck's drive motors. Every other electric load in the truck uses 48v. Both of these are much higher in the Cybertruck than all other Tesla models. All other Tesla models use 400v [IIRC] for the drive motors and 12v for everything else.

Re: Tesla shares 48V architecture with other automakers

#236

Post by MrVitaliy »

PoE over CAN bus moves more complexity from EE world into software world. While Tesla currently has best auto software, this is still a very foreign and a different way of thinking/managing for traditional auto manufacturing. This won't be just using a different set of cables, it's going to flip their engineering departments upside down.

Re: Tesla shares 48V architecture with other automakers

#237

Post by commoner »

eternityforest wrote: post #176
ipaddr wrote: post #173

Earlier quoted context omitted.

He said "Journalism". A non-journalist can produce material that can be considered journalism. A student can teach. A homemaker can even write working code. The labels we give to others to divide us

I always wondered why there's not some kind of nonprofit volunteer journalism organization you can get involved with. It doesn't appear to be something anyone tries to get normal citizens into, despite the fact that we constantly try to convince people to learn other stuff with much less individual scale value, sometimes even somewhat crazy stuff like home chemistry experiments with lead salts. I always thought that'…

Have you tried writing for Wikinews?

https://en.wikinews.org/wiki/Main_Page

Unlike Wikipedia, Wikinews allows and encourages original reporting. You don't need a journalism degree to contribute an article.

Re: Tesla shares 48V architecture with other automakers

#238

Post by sbierwagen »

Moto7451 wrote: post #189

Audi also has a 48v architecture in use for mild hybrids like my SQ5. This is an older article but explains it well https://www.greencarcongress.com/2017/06/20170602-audi.html My 2021 is fully 48v except for an inverter for necessary 12v circuits (like cigarette outlets and the jumper pins) and a small motorcycle battery that is used for minimal 12v functionality. The mild hybrid battery is under the rear seats and s…

>and the jumper pins

It can be started through the converter? That takes something like a hundred amps. It must be pretty beefy.

Re: Tesla shares 48V architecture with other automakers

#240

Post by klysm »

MrVitaliy wrote: post #236

PoE over CAN bus moves more complexity from EE world into software world. While Tesla currently has best auto software, this is still a very foreign and a different way of thinking/managing for traditional auto manufacturing. This won't be just using a different set of cables, it's going to flip their engineering departments upside down.

Wouldn’t it be PoC instead of PoE?
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