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RegGuheert
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Re: Tesla Semi Truck

Wed Mar 14, 2018 5:58 am

Electrek reports that a Tesla Semi has been spotted in St. Louis!:
Electrek wrote:Just a few days after completing its first cargo trip, a Tesla Semi electric truck has now been spotted all the way in St-Louis at a Supercharger station.
I wonder if this is part of a tour of customers with the truck, similar to what Boeing and Airbus do with their new planes prior to introduction.
RegGuheert
2011 Leaf SL Demo vehicle
10K mi. on 041413; 20K mi. (55.7Ah) on 080714; 30K mi. (52.0Ah) on 123015; 40K mi. (49.8Ah) on 020817; 50K mi. (47.2Ah) on 120717; 60K mi. (43.66Ah) on 091918.
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dgpcolorado
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Re: Tesla Semi Truck

Wed Mar 14, 2018 10:49 am

RegGuheert wrote:Electrek reports that a Tesla Semi has been spotted in St. Louis!:
Electrek wrote:Just a few days after completing its first cargo trip, a Tesla Semi electric truck has now been spotted all the way in St-Louis at a Supercharger station.
Must take a long time to Supercharge such a large battery with a single nozzle. I presume that the megachargers will be a lot faster, besides being trailer friendly.
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RegGuheert
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Re: Tesla Semi Truck

Wed Mar 14, 2018 1:04 pm

dgpcolorado wrote:Must take a long time to Supercharge such a large battery with a single nozzle. I presume that the megachargers will be a lot faster, besides being trailer friendly.
I read somewhere last week that they can connect to two SuperChargers at the same time. Still, it would take some time.

I'm wondering if I should start looking for the Tesla Semis here in VA.
RegGuheert
2011 Leaf SL Demo vehicle
10K mi. on 041413; 20K mi. (55.7Ah) on 080714; 30K mi. (52.0Ah) on 123015; 40K mi. (49.8Ah) on 020817; 50K mi. (47.2Ah) on 120717; 60K mi. (43.66Ah) on 091918.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

GRA
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Re: Tesla Semi Truck

Wed Mar 14, 2018 5:57 pm

RegGuheert wrote:Electrek reports that a Tesla Semi has been spotted in St. Louis!:
Electrek wrote:Just a few days after completing its first cargo trip, a Tesla Semi electric truck has now been spotted all the way in St-Louis at a Supercharger station.
I wonder if this is part of a tour of customers with the truck, similar to what Boeing and Airbus do with their new planes prior to introduction.

Almost as rare is what appears to be a Think Citi parked next to it. The plastic body is a giveaway.
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keydiver
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Re: Tesla Semi Truck

Wed Mar 14, 2018 6:02 pm

I wouldn't doubt that they would plug into 4 SC chargers at a time, if the cords would only reach. :D
If i recall, the Megacharger connector has 8 huge terminals, which would seem to indicate 4 separate battery packs, one for each motor. So, maybe they are charging 2 packs at a time, doubling the charging time compared to a Megacharger. Just a guess.
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RegGuheert
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Re: Tesla Semi Truck

Thu Mar 15, 2018 1:43 pm

RegGuheert wrote:I wonder if this is part of a tour of customers with the truck, similar to what Boeing and Airbus do with their new planes prior to introduction.
It looks like the customer was Anheuser-Busch:
Electrek wrote:After this first cargo run between Nevada and California, one of the prototypes apparently set out to St-Louis for Anheuser-Busch, the brewer behind Budweiser who also ordered 40 Tesla Semi trucks last year.

People at the early Tesla Semi reservation holder were able to get a close look at the vehicle and Tony Knoblauch sent us a bunch of great up close pictures of the truck (thanks to his brother Brandon too)...
Here is a photograph of a couple of the electric motors and their gearboxes taken during that visit:

Image
RegGuheert
2011 Leaf SL Demo vehicle
10K mi. on 041413; 20K mi. (55.7Ah) on 080714; 30K mi. (52.0Ah) on 123015; 40K mi. (49.8Ah) on 020817; 50K mi. (47.2Ah) on 120717; 60K mi. (43.66Ah) on 091918.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

NeilBlanchard
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Re: Tesla Semi Truck

Fri Mar 16, 2018 10:07 am

RegGuheert wrote:
cmwade77 wrote:Not really, because per mile driven EVs consume less electricity than gas powered vehicles and considering most of the refining of oil is done in Southern California, as demand for gas goes down, the electricity will be freed up for EVs.
Let's not repeat this oft-stated myth. Here are a few calculations to estimate how much electricity is used to produce each gallon of gasoline:

Some assumptions:
- Each barrel of oil produces about 20 gallons of gasoline
- All oil consumed in the US is refined in the US.
- About 1/2 of the electricity used for pumping oil and refining oil is for the gasoline portion. (The truth is probably lower than this, but this is close enough for these purposes.)

Some data:
- In 2016, the US consume 7.21 billion barrels of oil each year
- In 2016, the US refineries purchased 47.388 billion kWh of electricity
- This site estimates that it takes, on average, 18 kWh to pump a gallon of oil from the ground in CA (back in 2011).

Crunching the number:
- Electricity used to refine each barrel of oil in the US in 2016: 47.388 billion kWh / 7.21 billion barrels = 6.6 kWh/barrel
- Total electricity used to produce and refine each barrel of oil: 24.6 kWh
- Portion of per-barrel electricity used for gasoline: 50% * 24.6 kWh = 12.3 kWh
- Approximate amount of electricity consumed to pump and refine each gallon of gasoline in the US: 12.3 kWh/20 gallons = 0.6 kWh/gallon

The gallon of gasoline will take you between about 15 and 50 miles while the 0.6 kWh of electricity will take you fewer than three miles. In other words, the gasoline allows you to travel 5X to 17X as far as the electricity alone would. Simply put, we need to produce significantly more electricity than we do today in order to convert the transportation sector from oil to electricity.


Extraction takes a LOT of electricity. In California, I heard that oil extraction is the second largest portion of all consumption, statewide. For some extraction operations, they use super heated steam to just get the oil out of the ground.

All that water has to come from somewhere, and that uses a lot of electricity, too.

lorenfb
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Re: Tesla Semi Truck

Sat Mar 17, 2018 8:11 am

Mercedes Benz actually has EV trucks being used by end-customers!

https://electrek.co/2018/02/21/mercedes ... k-eactros/

Daimler built two variants with a gross vehicle weight of 18 or 25 tonnes.
The truck is powered by two electric motors with a total power output of 250 kW and powered by two battery packs with a 240 kWh capacity.
The German truck manufacturer describes the powertrain:
The drive system comprises two electric motors located close to the rear-axle wheel hubs. These three-phase asynchronous motors are liquid-cooled and operate with a nominal voltage of 400 volts. They generate an output of 125 kW each, with maximum torque of 485 Nm each. The gearing ratios convert this into 11 000 Nm each, resulting in driving performance on a par with that of a diesel truck.
The maximum permissible axle load stands at the usual 11.5 tonnes. The energy for a range of up to 200 km is provided by two lithium-ion batteries with an output of 240 kWh.
Mercedes Benz actually has EV trucks being used by end-customers!
“We are now passing both two- and three-axle variants of our heavy-duty electric truck, the Mercedes-Benz eActros, into the hands of customers. Initially the focus will be on inner-city goods transport and delivery services – the ranges required here are well within the scope of our Mercedes-Benz eActros.”

The batteries are located in eleven modules –  three of these are located in the frame area and the rest are underneath.


Image

Note: Efficiency - 1.2 kWh / km ( ~ 2 kWh / mi )
Leaf SL MY 9/13: 70K miles, 49 Ahrs, 5.1 miles/kWh (average), Hx=70, SOH=78, L2 charges to 100% > 1000, max battery temp < 95F (35C), min discharge point > 20 Ahrs

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RegGuheert
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Re: Tesla Semi Truck

Tue Mar 20, 2018 4:32 am

Tesla Semi was last spotted in Dallas, TX. I wonder if it will come further east.
RegGuheert
2011 Leaf SL Demo vehicle
10K mi. on 041413; 20K mi. (55.7Ah) on 080714; 30K mi. (52.0Ah) on 123015; 40K mi. (49.8Ah) on 020817; 50K mi. (47.2Ah) on 120717; 60K mi. (43.66Ah) on 091918.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

LeftieBiker
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Re: Tesla Semi Truck

Tue Mar 20, 2018 4:51 am

There were electric milk trucks in operation in England in the 1950s.
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