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 > EV's I know there are folks better versed than me in here

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Learjet

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Posted: 07/26/21 12:30pm Link  |  Quote  |  Print  |  Notify Moderator

Some of the new Tesla's can charge at rate of 900 miles per hour with a 250kw charger....charging speeds are going up with some of the new vehicles.


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Learjet

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Posted: 07/26/21 12:31pm Link  |  Quote  |  Print  |  Notify Moderator

wanderingaimlessly wrote:

time2roll wrote:

Yes you can find some issues if you go looking for them. You can find even more boring success stories too but they don't make for exciting print.

https://electrek.co/2020/06/30/tesla-mod........l-3-police-cars-faster-roi-police-chief/


One thing I'm not sure of for police use is idle time sitting on the roadside running heat or AC. Either watching traffic, surveillance, or completing paperwork there is a lot of time spent in the vehicle, if the car is driven maybe 50% of the shift, and just sitting with the climate control running, will a single charge cover a full shift?


I'm pretty sure a Tesla can run the AC or heat for a day or two on a charged battery... if just parked.

8.1 Van

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Posted: 07/26/21 02:40pm Link  |  Quote  |  Print  |  Notify Moderator

wanderingaimlessly wrote:

time2roll wrote:

Yes you can find some issues if you go looking for them. You can find even more boring success stories too but they don't make for exciting print.

https://electrek.co/2020/06/30/tesla-mod........l-3-police-cars-faster-roi-police-chief/


One thing I'm not sure of for police use is idle time sitting on the roadside running heat or AC. Either watching traffic, surveillance, or completing paperwork there is a lot of time spent in the vehicle, if the car is driven maybe 50% of the shift, and just sitting with the climate control running, will a single charge cover a full shift?

NYPD buys Tesla Model 3 and turns it into an electric patrol vehicle


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Posted: 07/27/21 05:58am Link  |  Quote  |  Print  |  Notify Moderator

Learjet wrote:

Some of the new Tesla's can charge at rate of 900 miles per hour with a 250kw charger....charging speeds are going up with some of the new vehicles.


Any idea how much it costs to run a 250kw connection to a charging station?

A 200amp @ 240v household connection peaks at around 48kw but in reality, the power company doesn't provide 48kw for each house in the neighborhood because generally, household draws never come close to 48kw. They significantly de-rate the upstream connection because they know it won't be used.

A 250kw charger will be pulling it's full rating probably more like 260-280kw (accounting for losses) and it will do it continuously while charging.

Now if you have a station with 10 charging stations, that means they need a supply equal to 2600-2800kw. Getting a connection on that size range in to the station can easily run into the low to mid 6 figure range. Amortize that and add in the cost of the actual power and don't be surprised when the cost is higher than gasoline. If you try to install one out away from major cities, it could easily move up into the 7 figure range.

Admittedly, most charging will be slow charging at home but don't expect 250kw chargers to be common place. Most likely they will always be specialty items.


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thomas201

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Posted: 07/27/21 11:07am Link  |  Quote  |  Print  |  Notify Moderator

Not that I think that other car makers are any better, but you need to pay attention and cut through the hype. Marketing and sales are not always your friends.

Car and Diver did a test, same car, no prewarm either time and 3% to 100% on charge. This was a Tesla Model 3 LR:

"Although the total energy expended was 1.1-kWh more at the V3 Supercharger, about 40 percent of that difference was due to more energy being wasted at the higher-output station. The overall charge time at the 250-kW Supercharger was one hour and six minutes, saving us two minutes over the 150-kW charger, which filled our battery from three to 100 percent in one hour and eight minutes."

Car and Driver, 4/20

EV's are getting their for my use, just not quite yet. Your Mileage May Vary

8.1 Van

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Posted: 07/27/21 11:56am Link  |  Quote  |  Print  |  Notify Moderator

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time2roll

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Posted: 07/27/21 12:00pm Link  |  Quote  |  Print  |  Notify Moderator

The V3 will make a bigger difference on the CT with larger battery. This is why I did not get the L3 connector on my original LEAF back in 2011... battery was too small to make enough difference. And besides very few L3 stations back then.

I wonder if the V3 might be used on the Semi for overnight charging instead of the mega-charger.


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wilber1

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Posted: 07/29/21 10:23pm Link  |  Quote  |  Print  |  Notify Moderator

Dang physics.

Energy density of lithium ion battery 0.37 to 0.95 MJ/kg
Energy density of gasoline 44.0 MJ/kg


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time2roll

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Posted: 07/29/21 10:30pm Link  |  Quote  |  Print  |  Notify Moderator

wilber1 wrote:

Dang physics.

Energy density of lithium ion battery 0.37 to 0.95 MJ/kg
Energy density of gasoline 44.0 MJ/kg
Does that include the air you burn from the atmosphere?

ktmrfs

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Posted: 07/29/21 10:44pm Link  |  Quote  |  Print  |  Notify Moderator

wilber1 wrote:

Dang physics.

Energy density of lithium ion battery 0.37 to 0.95 MJ/kg
Energy density of gasoline 44.0 MJ/kg


gas engine efficiency about 25% at best during a drive cycle. electric motors in the high 90-95 %. + the energy recovered during braking.

so that turns tables to about 5 or 10:1 on a weight basis. still and advantage to a gas engine, but not as dramatic as it first seems.

Key is
1) getting charging tine down to about time to fill a gas car 10-15minutes
2) getting infrastructure to support the charging
3) getting power from non hydrocarbon or carbon sources (coal, NG)_ Thermal efficiency of gas turbine power stations is about 60%, better than internal combustion but still not great.


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