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Tesla shares 48V architecture with other automakers

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Re: Tesla shares 48V architecture with other automakers

#501

Earlier quoted context omitted.

Good look doing DIY work on the 48V network of a modern car, ICE or EV or 12, 24 or 48 V doesn't matter. And the past 12 V systems are dead easy to work on. On older cars that is, as soon as you have electronics and bus systems DIY basically requires deep car electronics knowledge and skills.

> as soon as you have electronics and bus systems DIY basically requires deep car electronics knowledge and skills. So how is this done on cars? Dores each manufacturer have their own proprietary bus system (what i imagine), or is there a standard that everyone can use?

Nah there’s been mandated standards since the 90s eg OBD I/II/III

Protocols like CAN, LIN, SENT and XCP are all standardised point to point and bus protocols for automotive stuff

I personally think the standardisation is actually a bit limiting[1]

Just like SpaceX found massive cost savings in using networking tech over hard wired interconnects, I think there’s a good chance China or other manufacturers might catch on

[1]I think interconnect failure rates are so low out of factory it’s not unethical to begin making things more lean, obviously with sufficient human safety testing

But I’m not an expert, just a former engineer working in an electronics shop…

Re: Tesla shares 48V architecture with other automakers

#502
post #369

Earlier quoted context omitted.

I get this a lot I work at an electronics store in Australia This week I had a customer dumbfounded why his 3,500W inverter almost caught fire He was using 8-gauge wire (~56A max) He needed 00-gauge (almost 300A max) If he’d have run the system at 48V instead of 12V he’d have saved $200+ per metre on cabling his inverter My advice on voltage selection for a vehicle is once you’re needing more than a few metres of 0-g…

Thanks for posting this - I only noticed your reply now. Exactly this. Installing inverters for my own projects is what really highlighted the amp/volts/gaugerelationship. I quickly moved to 24V and will push for 48V for my next. As an aside I use Victron gear which I'm very happy with. Biggest install is for a film van and has dual 5KW inverters that can deliver 8KW continuous - and it's a 24V system.

Victron is an amazing manufacturer

I love that they don’t keep releasing new products so they can properly support their existing (extremely well made) lineup

Look into data centre infrastructure if you want to find interesting brands and solutions

A lot of automotive/DIY marketed gear seems to be reinventing the wheel and charging a much higher premium for it

Re: Tesla shares 48V architecture with other automakers

#503
post #369

Earlier quoted context omitted.

I get this a lot I work at an electronics store in Australia This week I had a customer dumbfounded why his 3,500W inverter almost caught fire He was using 8-gauge wire (~56A max) He needed 00-gauge (almost 300A max) If he’d have run the system at 48V instead of 12V he’d have saved $200+ per metre on cabling his inverter My advice on voltage selection for a vehicle is once you’re needing more than a few metres of 0-g…

How do you integrate the 48V system with the existing 12V system when doing aftermarket/DIY work? Do you add a 48V inverter? A buck-boost DC-DC converter? between the battery (or main fuse block) and the 48V system?

Do not attempt a hybrid system with different voltages DIY

In an industrial setting it can be done but you need an extremely well designed and made termination point for one system and an interconnect for another, I’ve seen customers using floating grounds (and negative voltages) to enforce it

If upgrading to 24V or 48V I recommend having a solid grasp on circuit protection first, and if you have concerns, pay the 30 minutes or so labour for an automotive electrician to inspect it

Re: Tesla shares 48V architecture with other automakers

#504
post #400
post #369

Earlier quoted context omitted.

I get this a lot I work at an electronics store in Australia This week I had a customer dumbfounded why his 3,500W inverter almost caught fire He was using 8-gauge wire (~56A max) He needed 00-gauge (almost 300A max) If he’d have run the system at 48V instead of 12V he’d have saved $200+ per metre on cabling his inverter My advice on voltage selection for a vehicle is once you’re needing more than a few metres of 0-g…

I guess you work at Jaycar too? Always a fun conversation trying to explain voltage drop to someone who wants to cheap out on cable with our inverters and DC/DC chargers. I'm sure a 48V bus would solve all those F1 errors too.

Yeah my dude

Didn’t think there’d be more than one of us on here

Such a wild west company to work for. I enjoy meeting the many very bright people who work for us before they inevitably move onto other things

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