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EV-based road transportation is not viable

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nctnico:

--- Quote from: TimFox on February 18, 2023, 12:36:50 am ---
--- Quote from: nctnico on February 18, 2023, 12:28:50 am ---Why would you like to have extra noise in the cabin? To me the idea is insane. Sound doesn't make a car go faster.  My previous car had a rather loud diesel engine. I installed over 25 sqm of thick, sound proofing rubber mats in it to lower the noise a bit. I took the entire interior + lining out and put the rubber mats underneath.

--- End quote ---

Why do motorcyclists insist on loud noise from their machines?  It's a matter of taste.
However,  there are regulations requiring audible sounds outside the vehicle to warn pedestrians of its approach.
US regulation for hybrid and electric vehicles (2022): 

--- End quote ---
But those relate to outside sounds. I don't want to have sounds inside the car except for the radio or having a conversation with a passenger. Sure I had a rattle on the wheels of my bike when I was 8 years old but I have outgrown that quickly.

TimFox:

--- Quote from: nctnico on February 18, 2023, 12:48:51 am ---
--- Quote from: TimFox on February 18, 2023, 12:36:50 am ---
--- Quote from: nctnico on February 18, 2023, 12:28:50 am ---Why would you like to have extra noise in the cabin? To me the idea is insane. Sound doesn't make a car go faster.  My previous car had a rather loud diesel engine. I installed over 25 sqm of thick, sound proofing rubber mats in it to lower the noise a bit. I took the entire interior + lining out and put the rubber mats underneath.

--- End quote ---

Why do motorcyclists insist on loud noise from their machines?  It's a matter of taste.
However,  there are regulations requiring audible sounds outside the vehicle to warn pedestrians of its approach.
US regulation for hybrid and electric vehicles (2022): 

--- End quote ---
But those relate to outside sounds. I don't want to have sounds inside the car except for the radio or having a conversation with a passenger. Sure I had a rattle on the wheels of my bike when I was 8 years old but I have outgrown that quickly.

--- End quote ---

Outside sounds are a matter of regulation.
Inside sounds are a matter of taste.
Have you watched a child play with a toy car?  They always make car noises while pushing it along the floor.
Motorcycles are both inside and outside.
Personally, I prefer quiet, with minimal noise from my car, passing motorcycles, and subwoofers from the pickup truck next to me at the traffic light.
Since my modestly-priced car has non-minimal cabin noise, I did not buy an expensive audio system to listen to classical music.

Marco:

--- Quote from: mikeselectricstuff on February 18, 2023, 12:02:53 am ---High power DC chargers already have liquid cooling of the cable and plug

--- End quote ---
That leaves the battery pack.

The standard cooling system isn't going to accomplish much against 100+ kW of heating. It's pretty much all going to go into the battery pack.

tggzzz:

--- Quote from: karpouzi9 on February 18, 2023, 07:28:40 am ---What would even be the point of charging a 60 kWh battery in 35 seconds rather than 10 minutes?

--- End quote ---

Charging like that would be like refilling an ICE engine's tank.
Major benefit: the existing petrol stations could be repurposed
Major benefit: no need for very expensive new distributed fragile infrastructure everywhere cars are parked.

tom66:

--- Quote from: karpouzi9 on February 18, 2023, 07:28:40 am ---Imagine putting massive carbon-carbon brakes on a stock Prius or bicycle rim brakes on an F1 car. It makes no sense. If your car has a battery that can dissipate XXX kilowatts of heat when charging, and the plumbing + thermal capacity to handle that, the car's going to be marketed as capable of that heat dissipation capability while driving (discharging) too. It's going to have a cooler good for XXX kilowatts already. And, this might be surprising, but usually batteries can discharge faster than they can charge, while the resistance is the same -- so you're always going to have more heat rejection capacity than you need for charging anyway.
--- End quote ---

Yeah I heard this idea before that we'll have 2-3MW+ charging and I don't buy it.  You don't reasonably need more than 250kW discharge, so if you had that much charge current, your battery, all of its current collectors, busbars, main wiring, contactors etc. would have to be oversized for that charging current.  Lots of weight and cost for that.  More likely the people who don't like stopping so often will get a 100-120kWh battery car instead of a 60kWh battery car.  120kWh at 3.5mi/kWh gets you 420 miles (nice) so if it could do say 650-700 miles with one 10 minute stop then it's pretty close to as convenient as an ICE.

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