Automotive Industry migrates to 48V electrical system

"... raising automotive voltage to 48 is a terrible idea...", this versus the 300V off the battery pack?

The ship has already sailed.

 

Ever hear of a aircraft called the Hindenburg? Hydrogen is the most explosive element on earth.

 

The Hindenburg was using hydrogen for lift, not as a fuel. It wasn't contained like it is in a vehicle. Apples/oranges. Not to say there aren't risks, but there are risks in anything.

 

Old news, there are already Hydrogen fueled cars out there. They have come and gone to make the fruits and nuts in Calaphonie happy. Latest failure is Honda Clarity will be a flop like any Hydrogen economy fueled by the Green Mafia and Tree Hugger nonsense.

First hydrogen is not a Fuel Source, it is an Energy Carrier like compressed air, pump back lake, or a battery. Hydrogen has to be made from a Fuel Source like natural gas, coal, nuclear energy etc... That means hydrogen will always be a multiple of the Source Fuel. With a Efficiency of 5 to 10% round trip is plain ole simple Green Mafia madness. You take 10 to 20 units of s Source Fuel, and when converted to hydrogen and back to energy you get 1 unit output. Example 20 therms of Natural Gas, store it, and you get 1 therm out when used. Hydrogen is a huge waste of resources and money robbing future generation of resources and money.

 

Finally!!! It's about time that someone has pointed out the nonsense of using Hydrogen as a fuel. If Hydrogen were to be a viable energy source, there would have to be a large amount of free, elemental Hydrogen that was readily accessible from the surface of the Earth. This is not the case. Virtually all Hydrogen on Earth is in the form of a compound, combined with at least one other element, for example, with Oxygen to form water, or with Carbon to form the 10s of thousands of hydrocarbon compounds, or with Oxygen and Carbon to form carbohydrates, etc. We would need to consume energy to separate the Hydrogen from the other elements before we could use it as a fuel. From where would that energy come? Burning fossil fuels? Kinda like the battery powered electric car, what is the source of the energy that charges the batteries? The majority of electricity in North America is generated by burning coal, so that "clean" electric car is really powered by burning coal! We need to consider not only how "clean" the vehicle is, but the "cleanliness" of the entire system.

Burning Methane (aka, natural gas) for our energy is much more practical than burning Hydrogen. Methane is plentiful and readily accessible in the Earth's crust. Methane is CH4, one Carbon atom and four Hydrogen atoms combined into one molecule. When burned, it yields one molecule of Carbon Dioxide (CO2) and four molecules of water (H2O). Green plants absorb the CO2 and break it down, releasing the Oxygen back into the atmosphere. As long as we have enough green plants, the CO2 will be cleansed from our atmosphere and oxygen will be returned. The water that is created, however, is an extremely stable compound, and it will remain as water because there are no natural processes that break it down into Hydrogen and Oxygen. Maybe our real environmental pollutant will turn out to be too much water, instead of too much Carbon Dioxide.

 

Teslas have drive across the USA for a number of years and I've not heard any trouble with the existing Wifi connections from friends who own them.

 

So why do power utilities use high voltage power lines again? Oh.. Thats right... They use higher voltage (which enables them to use smaller wire) to lessen the voltage drop! Better get your calculator calibrated son!

73
Jim W7RY

 

You just described the Mercedes diesel cars from the 1980's ...

 

Oh... Forgot to say its about watts. 100 watts at 12 volts is 8.3 amps. At 48 volts, its 2 amps. That would be less voltage drop so a smaller wire would work just fine. Smaller wires, means the vehicle weighs less!

 

It's a matter of what you hold constant, and what you allow to vary. In the first post on this thread, to which I replied, the scenario was what happens if you hold wire size and current constant, but vary the voltage supplied at the power source. The voltage drop along the wires is given by E=IR, and I is constant (because the scenario is to hold current constant) and R is constant (because it's the same wire), so E dropped by the wire is constant.

The classic explanation of why power companies use high voltage involves comparing two ways of delivering the same power to the load. Not holding current constant, but holding power constant. Since P=IE, When you hold power constant, if E is increased, I must be decreased so that the product of IxE stays constant.

In that scenario, of course the voltage drop is reduced, because the current is reduced.

But that's not what we were talking about.

 

When I saw this equation as a kid, "P=IE", I knew electronic was my future. I love Pie!

But that's not what we were talking about, either.

 

Ya, that is why I stick with older cars. Just share the amount of those electronics in the modern car makes me sick! All those screens and LEDs.

 

5G is one too many "G's"

 

The new thing is remote operation from the car. I know a few people that use a Flex at home remote networked and use an Ipad and headset with a hotspot in the car for mobile.

Less or no issues with RFI, Much more efficient antennas and far fewer installation hassles of rig and antenna.

 

We have not had 12 volt systems in nearly 30 years. As it is now the automotive systems are 14 volts. With start stop techknowledgey Higher voltage will be required.
Most of the communication is 5 volt. CAN Buss is the wave of today. But just think at 48 volts you an run your FET amp direct.
Ive been in the automotive business for over 34 years and I m not loosing any sleep over such a minor issue.
In ten years 90 percent of all vehicles produced will have some sort of hybrid technology incorporated.
The good news is you will have plenty of time to think about it, while your car drives you to your destination.