So, why cars still use 12V electrical system.
Wouldn't 48V be smaller and more efficient also it's a mature technology in telco industry.
There's literally no reason we should be stuck with it
Why change something thats not broken?
Also try to get companies on board, good luck
>>15346877
BMW is supposed to switch to 48v, but its not easy. cars have been running on 12v for like 80 years.
Switching is gonna make a lot of mass produced parts different. Car electronics are the most expensive shit to produce. Most car companies dont even make their own window switches, they are usually made by 3rd party companies.
There is a reason older exotic cars just used existing production car headlights, and tailights assemblies. Its cheaper to make a carbon fiber body panel than it is to make taillights, and window switches.
>>15346877
>more efficient
what lol?
Anyway, they are already changing since cars are now iphones on wheels.
>>15346877
The battery lobby has congress bought and paid for.
>>15346890
4X the voltage means 1/4 the amps so smaller wires, switches, etc.
>>15346898
that doesn't mean it's more efficient.
>>15346933
Yes it does
>>15346935
no, it doesn't.
>>15346941
yes, it does
>>15346935
Power consumption makes it more efficient not the voltage you're using
>>15346950
Have fun powering that starter motor fuckboi
>>15346956
>I have no understanding of the basics of electrical engineering
Ok
>>15346933
Then why do power transmission lines use high voltage?
Is there a specific problem with 12v to be solved that would be worth the cost of switching to 48?
>>15346959
For smaller cables, you don't need smaller cables in a car, they're pretty small to begin with
>>15346959
Lower loss rates. Ohm's law!
>>15346887
Can't stop picturing the R390
I hate the thread-jack, but this makes me think of when I think about how a lot of cars are still using traditional filament-type bulbs. Because business.
>>15346882
heres your reply
>>15346972
not really.
save weight on the loom and lower the load on the alternator.
seems kind of stupid to be conscerned with 30lbs of loom weight when your car is packed with 1,000lbs of bullshit "features" and "safety".
>>15347166
Kill yourself you fucking retarded newfag
>>15346890
>>15346951
>>15346933
Holy shit guys pick up a multimeter and a book and find out for yourselves.
Higher voltage means higher efficiency regardless of wire thickness. It just so happens that less current means less heat created and therefore the wires don't need to be as beefy.
>>15347175
Most IC level shit in modern cars runs at ~5v or less. Stepping down from 48v to 5v is not efficient.
>>15347175
Obviously you don't understand what voltage is.
>>15346972
in the future some systems like 4ws will require high power so increasing voltage is a good thing.
as said bmw has been considering 48v for about a decade or more but the costs are too much
The only drawback of 48V is that it can zap humans, not much but you can feel it, compared to the 12V which you can't feel a thing
Can we get an electrical engineer in here to prove that this guy >>15346933 is a faggot.
>>15347236
48V DC can't do shit to anyone.
>>15347236
i was just thinking this, would a higher voltage mean more issues with internal arcing in components?
>>15346959
Because voltage drop over long distances, iirc most cars aren't hundreds of miles long
>>15346877
>Wouldn't 48V be smaller and more efficient also it's a mature technology in telco industry.
Unlike 48V, 12VDC is far more mature in the automotive industry. So your reasoning about maturity there is flawed. Otherwise, you can say 4800 volt electrical lines are very mature in the electrical industry, thus cars should all use high voltage. All aux power outlets in cars should be 4800 volt for baby fingers to touch.
To a baby, 12v is not bad. But 48volt would be bad. Power system shorts at 48 volts are serious. It's why electrical insulation above 30 volts is of a different type. 30 volts and lower is considered low voltage wiring in the insurance industry too. So if you go to 48 volt wiring, your insurance costs will necessarily go up.
>>15347307
>48V DC can't do shit to anyone.
Yes it can. Wire can almost explode at that voltage level if it shorts.
>>15346877
>There's literally no reason we should be stuck with it
So, by your logic, if there is even one reason, then your logic fails.
Userbase Inertia
The legal requirements to support the existing userbase with parts for at least 7 years after the release of a model car.
12 volt electrical wiring systems are safer than 48 volt electrical wiring systems.
>>15346890
Fuck you. You are the shit that is ruining this board. If you don't know how higher voltage would be more efficient, either read a book, or fuck off and never come back.
>>15347851
It's okay to admit you don't know what you're talking about.
>>15346877
There have been plans to switch to 48V for 30 years now. It only has advantages. Making transitions like this is hard for the automotive industry. Ethernet is superior to the CAN-protocol in every way but it will take decades before we see ethernet-buses.
>>15346877
Electric idiot here
If one cell is 2.1v. Does adding maybe 6 extra cells make it 25.2v? Or not this simple?
>>15347937
Add batteries in series to increase voltage like you said, put them in parallel to increase the current
>>15347937
Yes, in series. You can also cancel out cells this way, if you ever needed to
>>15347937
That's part of the reason it went from 6 to 12 and is gonna be 48, instead of 50 or something nice and round.
>>15347161
>implying 90% people on road care about their lights
Mechanic here. The most bullshit complain I hear about is "wahhh! How could this little light cost $30!! I hate mechanics now!"
Well no fucking shit if you're cheap ass just stop buying newer featured cars
Nigger if you work in the field, you'd know that even Mercedes drivers want to spend no more than $5 on a bulb and still complain when it burns. Average people ain't you /o/tist type
This is like the wall power outlet thing all over again.
>>15346886
Because modern cars have so many modules and technological bullshit that they're running out of juice to power it all. Something like 30+ different modules on the new caddies
>>15347999
Pretty much. The only reason some countries are still stuck with 117 volts is that its a precedent.
>>15348010
You have absolutely no idea how electricity works
>>15346877
Increased risk of electrical shock
>>15347918
unfortunately
>>15347263
it is more efficient but by a tiny bit that it literally doesn't matter if were talking about a car scenario
>>15347328
again, the voltage drop can be ignored because of the way the electrical system is designed, also the reason for using high voltages is to cut down massively on losses
>>15347851
>>15347878
read above
>>15347999
>>15348704
the public voltage regulations are much more complicated than "just switch outlets lmao"
