How do Tesla Chargers Work?

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OK Pawi, explanation is clear describing how we can get 1A with < 4.2V. I guess I was thinking about car batteries where you can really hit them in the bulk stage, then finish off at 14.4 and 13.2V. While everyone is thinking about multi mode chargers, how do those tesla chargers work? Whats the V and A? Do you need a credit card to use them? How much does it cost? (I assume its more than $.15 per KWhr?) I've only seen one Tesla, never ridden in one, and I saw a charger in front of some lawyers office. Seems like negative advertising if you're looking for some bargain legal advice.

 

 

 

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Jim

Imagecraft compiler user

Last Edited: Tue. Jan 3, 2017 - 02:10 AM
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bobgardner wrote:

While everyone is thinking about multi mode chargers, how do those tesla chargers work? Whats the V and A?

 

Honestly, I have no clue at what voltages and currents Teslas operate. I only know that Renault uses about 400V packs, probably 100 cells in series. It is certain however that they all use the CC/CV method as it's the only sensible one there is.

As for Renault, it's also evident from the fact that it takes very little time to go to 80% charge compared to the last 20%. Some charging stations also display the current current (this isn't correct English, is it?!). On these chargers, this CC/CV thing can be observed quite clearly.

The Renaults can use up to 400V at 16A tri-phase AC.

For the the people from areas with different mains power: This kind of power is standard in most of central Europe. 230V AC from line to neutral, 400V from line to line, three lines at 120° phase shift. The normal outlets have three wires: line, neutral and ground, and they deliver nominally 230V at 10A. Tri-phase is used almost exclusively for appliances like dishwashers, washing machines and ovens. Therefore the five pin outlet(3 lines, neutral , gnd) is only found in kitchens, laundry rooms and sometimes garages.

 

Edit: formatting

"Some people die at 25 and aren't buried until 75." -Benjamin Franklin

 

What is life's greatest illusion?"  "Innocence, my brother." -Skyrim

 

Last Edited: Mon. Jan 2, 2017 - 08:39 PM
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pawi777 wrote:
... but why bother?
Alternate instruments and methods.

The Linear Technology solution has less volume with much less noise than the portable switcher I operated twenty years ago.

The PowerStream solution is less expensive, has battery charging information with it, and PowerStream is a source of battery information and chargers.

 

"Dare to be naïve." - Buckminster Fuller

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bobgardner wrote:
... how do those tesla chargers work? Whats the V and A?
Up to 120kW

bobgardner wrote:
Do you need a credit card to use them? How much does it cost? (I assume its more than $.15 per KWhr?)
Zero price; an assumption is the cost is a part of sales and leases.

Locally, have seen EV chargers at a Cracker Barrel and new hotels (a few parking spots)

For Texas, the Tesla Motors Supercharger network appears to be more for urban, semi-urban, and along interstates.

There are Tesla Motors operators in rural Texas; likely modified their garages and barns to add a common EV charger (guests may have a Chevrolet Volt, Nissan Leaf, etc)


https://www.tesla.com/supercharger

https://www.tesla.com/support/supercharging

https://www.crackerbarrel.com/

 

"Dare to be naïve." - Buckminster Fuller

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I used the tesla supercharger info to make this ss. Looks like a half hour on a supercharger is worth $12 or so. You cant charge it for an hr because it aint got that many kwhrs. So 170 mi at 30 mpg in a gasser should use 5.6 gal at $2.40/gal or $13.60, so I claim the tesla 'gets about 30 mpg'.

 

file teslacharger.xls              
Jan 2 17 Bob G   0.15 $/kwhr        
      miles per 1hr charge units? v a A per phase 1hr cost
single 10 kw 28 2.8 120 83.3    $       1.50
dual 20 kw 52 2.6 240 83.3    $       3.00
super 170 kw 340 130.8 480 354.2 118.1  $    25.50

 

I reworked the ss. Units is KWhr/mi, and the last row is same as the middle row, 2.8. Recip is Mi/KWhr. Amps per phase is same 83.3, 1 hr cost on the supercharger is $12, so that should double the equivalent mpg. I'm at work, but I'll edit the msg with the new ss when I get home.

 

Imagecraft compiler user

Last Edited: Tue. Jan 3, 2017 - 03:16 PM
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The local EV chargers :

  • EVgo, 50kW, 2 parking spots for one dual charger, RFID, one hour limit
  • BMW dealership, BMW i3, one charger though probably more

 

"Dare to be naïve." - Buckminster Fuller

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The university where I hang out has 21 chargers scattered around campus. These are the plug-in type. Some are from "Blink" and some are from "ChargePoint". There is a "membership fee" to use the Blink chargers (don't know how it is metered). 

 

The university, itself, has many electric vehicles. Some are like big ATVs while others are full vans, for the campus mail and maintenance folks, for example. The vehicle noise level on campus is much lower than it was just a few years ago. The campus is moderately large in area, with a core that is close to 1 square mile. 

 

Jim

 

Until Black Lives Matter, we do not have "All Lives Matter"!

 

 

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bobgardner wrote:
I've only seen one Tesla

I guess I see  about one a week these days on my commute (so it could be the same ones over & over).

 

That's in addition to other EVs/Hybrids.

 

EV chargers are quite common around here these days

 

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