Battery based electric vehicles of today and tomorrow.

[Larry Caldwell]

What if in the future, several hundred, if not thousands of electric cars are on the GW bridge, Lincoln tunnel or the capitol beltway in DC and there’s a accident in front of them and an hours-long traffic jam develops?
Now we all know, just like ICE vehicles low of fuel, plenty of the EVs will be low on battery life. Once dozens of EV batteries go dead in the traffic jam, how will you get to them to get them up and running to unblock traffic? If it’s on a bridge, tunnel or multi lane highway where there’s no aces to them, how do you recharge them?
With an ICE vehicle, you can literally walk to the vehicle with a gallon of gas and get moving.
Not so with an EV.
Sounds like a nightmare waiting to happen in congested cities all around the world.

That's a serious consideration in cold or hot weather. AC/heat sucks a lot of battery life. Improved efficiency may solve some of that problem, but not all of it.

New EV Air Conditioner Refrigerant Said To Extend Range By 50%

In extreme temperatures, cabin cooling and heating eat up significant amounts of power from an EV’s battery. A

electricvehiclenewsfeed.com

 

[Larry Caldwell]

From the article:
“Other potential solutions included a mobile charging pack, an adaptor to make all electric vehicles compatible with the most common charging station, and options to transport more battery replacements. The “wild” concept was a new service offering in which a recharging service provider brings a portable recharging station to drivers. The drivers could schedule recharges anywhere, on-demand.”

If this is the solution, how does a rescue vehicle drive to the dead battery EV possibly miles ahead in congested traffic? One can walk a gallon of gas to an ICE vehicle. What will the recharging pack weigh? I bet a lot.
Maybe a new business opportunity in the offing? Linebacker sized non-birthing/birthing persons with jumper backpacks waiting for helpless EV drivers to be stranded in endless backups in the Lincoln Tunnel? Lol

I would expect something like the "spare tire" donut shipped with most cars today. Something that would let you move 5 mph for a limited range, like a mile or two.

 

[Larry Caldwell]

Way more than an hour to charge. The 1 hour charge is just to make it to next fueling station. The forg lightning wants 8 hour charge at 80 amps.

That's draining the battery 20 times. It would be a big cost savings if you are putting 6000 miles a month on a rig.

 

[grsthegreat]

That's draining the battery 20 times. It would be a big cost savings if you are putting 6000 miles a month on a rig.

.???. Not sure what you mean

 

[Grumpycat]

And luckily, ALL EVs charge at night!
Never during the day at peak demand. Batteries always fully charged during the day lol

Why would one ever charge during the day when one can start every morning with a full charge for 150-300 miles? Especially where T.O.U. billing is used in areas deprived of sufficient generating capacity by government mismanagement. In those areas nighttime electric power is outright cheap. So cheap people purchase $10k Tesla Powerwalls to charge at night with cheap power so as to supplement their daytime usage.

The answer is one would charge during the day on rare road trips to distant locales. Is a very small percentage of EV power usage but something lightweight thinkers can not get "the gas station paradigm" out of their heads as the only means of fuel/powering all modes of transportation.

 

[Whidbey]

Why would one ever charge during the day when one can start every morning with a full charge for 150-300 miles? Especially where T.O.U. billing is used in areas deprived of sufficient generating capacity by government mismanagement. In those areas nighttime electric power is outright cheap. So cheap people purchase $10k Tesla Powerwalls to charge at night with cheap power so as to supplement their daytime usage.

The answer is one would charge during the day on rare road trips to distant locales. Is a very small percentage of EV power usage but something lightweight thinkers can not get "the gas station paradigm" out of their heads as the only means of fuel/powering all modes of transportation.

Maybe some of these EV owners work at might. It stands to reason that a significant percentage of thesr owners will be charging during the day at some point. The idea of purchasing a Tesla Powerwall sounds very Californian to me.

 

[Grumpycat]

Way more than an hour to charge. The 1 hour charge is just to make it to next fueling station. The ford lightning wants 8 hour charge at 80 amps.

Your ignorance is showing. Trivially easy internet search, "ford lightning charge rates" finds this as the 2nd hit:

https://media.ford.com/content/dam/fordmedia/North%20America/US/product/2022/f-150-lightning/pdf/F-150_Lightning_Tech_Specs.pdf

Says to charge from 15% to 80% takes the standard battery 44 minutes on the 150 kW DCFC one would use for intercity travel. Surprisingly faster 41 minutes with the larger battery. That is 150 miles added to the standard battery in 44 minutes, 195 miles for the extended range battery in 41 minutes. "Way less than an hour", and more than enough to get between charging stations (if it was a Tesla).

10 minutes will add 41 or 54 miles.

80A L2 charging is what one uses overnight at home.

80% is the common practice "full charge" because unlike ICE vehicles filling the gas tank to the top one does not fully charge nor fully discharge the battery but in rare instances the need is great. Wear on the battery is much greater in the top 10% and bottom 10%. Less the next 10%. Very wear little between 20% and 80%. So it is the same sort of thing as not shifting the transmission at redline everywhere you go.

 

[Grumpycat]

Which brings up the question:

If an EV runs out of battery power, can you put it in neutral to push it off the side of the road?

EVs do not really have neutral. Motor is permanently geared to the wheels. No clutch, no torque converter.

On Tesla Model S the rear wheel drive motor uses an excited field so when that is not energized the motor turns free. Parking brake clamps the rotors. Pretty sure that is powered from the 12v battery which powers all the lights and computers.

The Model 3 motor is more advanced with partial permanent magnet and partial excited field. So without power it will drag a bit. The only issue is releasing the parking brake.

Both Teslas have a "neutral", and a tow mode, that the car can be pushed.

 

[txdon]

During a normal 10-hour shift the average police patrol vehicle only drives between 50 and 100 miles. Roughly 50% of a shift is spent idling which is what makes EVs so appealing. At the rate they're used you could go days without ever having to recharge. I've never seen data for ambulance and fire vehicles but I'd guess they drive even less and idle more. In fact having a close, fixed station makes EVs ideal

Some problems with this.
1. Police shifts work 24 hours not 10 the vehicles are shared between shifts. (Maybe a few detectives and chiefs work just the day shift). Patrols idling in Texas would have to utilize the A/C 9 months of the year.
2. Ambulances go to the location of the sick/injured usually within 20 miles but the run to the hospital that can accept certain patients can be 50 miles one way. Again they work 24/7 and the Ambulance would have to be put out of service during recharge.
3. Fire trucks are scattered to reduce response time, but if there is a large working fire the pumps will have to pump thousands of gallons an hour all day/night.

 

[Fixastuff]

Some problems with this.
1. Police shifts work 24 hours not 10 the vehicles are shared between shifts.

Not true. My across the street neighbor is a policeman and when he's not on duty the car is parked at his house. Probably every city does it different.