GRA
Posts: 7427
Joined: Mon Sep 19, 2011 1:49 pm
Location: East side of San Francisco Bay

Re: Is the "plug-in" era nearly over?

Wed Feb 15, 2017 6:29 pm

smkettner wrote:Unless all the cars are self driving it would seem less disruptive to share a single cord.
And then there is cost..... I would rather have 10 cords to ??? probably half or less as many wireless.

The question is, how likely are the cords to be there, and working? I've seen more than a few vandalized or accidentally damaged EVSEs, and wireless buried in the pavement/curb reduces/eliminates those issues. Once we get autonomous cars that can go find the nearest charging station, it's a no-brainer - every time I see Tesla's robotic charging 'arm' I just think Falcon Wing Doors issues x 10 - 100. As wireless charging and that level of autonomy look likely to appear about the same time, might as well start providing the infrastructure now.
Guy [I have lots of experience designing/selling off-grid AE systems, some using EVs but don't own one. Local trips are by foot, bike and/or rapid transit].

The 'best' is the enemy of 'good enough'. Copper shot, not Silver bullets.

smkettner
Posts: 7004
Joined: Mon Aug 09, 2010 10:13 pm
Delivery Date: 26 Feb 2014
Location: Orange County, CA

Re: Is the "plug-in" era nearly over?

Wed Feb 15, 2017 7:23 pm

Fair enough. My company has about 30 cords at various properties that have been in place five years.
Never vandalism.

As far as working they have been pretty good. Always the controller or a wire issue which applies same to wireless.
For the same money there could be more cords so even if there were issues there should remain more working.
JMHO

I am not against wireless for others. I just see increased vehicle cost, increased EVSE cost, reduced efficiency.
No thanks for the automatic arm. Although that is Tesla's cost so it is up to them and reliability issues that may or may not exist.
1 bar lost at 21,451 miles, 16 months.
2 bar lost at 35,339 miles, 25 months.
LEAF traded at 45,400 miles for a RAV4-EV

GRA
Posts: 7427
Joined: Mon Sep 19, 2011 1:49 pm
Location: East side of San Francisco Bay

Re: Is the "plug-in" era nearly over?

Fri Feb 17, 2017 4:49 pm

Via GCC:
Update: SAE J2954 wireless charging validation to 11kW, Recommended Practice to enable autonomous vehicle parking and charging in 2017
http://www.greencarcongress.com/2017/02 ... j2954.html

. . .
    The upcoming SAE J2954 Recommended Practice will enable a seamless, automated standard methodology to charge for individual vehicles to fleets of autonomous vehicles and their infrastructures. All of this with a specification to charge with high efficiencies over an air gap of 250mm (10 inches).

    —Jesse Schneider, chair of the SAE J2954 task force

For the infrastructure side, a common location for the wireless charging ground assembly—in the parking lot—will be determined in 2017. In the published SAE TIR J2954, alignment is done through magnetic field triangulation using either the existing charging coils or an auxiliary antenna. SAE J2954 is planning to make a decision regarding alignment in 2017 as a basis for all infrastructure ground assemblies.

The SAE Communications Taskforce is assisting the Wireless Charging with an ecosystem for wireless communications, to allow a seamless vehicle to wireless infrastructure and later vehicle to ground assembly. SAE is utilizing IEEE 802.11(n) as a basis for this communications, which is similar to DSRC (or IEEE802.11p). The goal is that the vehicle navigation system can first locate an available wireless charging parking spot, lead you to a wireless charging point and SAE J2954 would help align your car in the parking spot, and finally wirelessly charge. As a concept, payment could be also automated through the same communications hub with no interaction required from the customer except pre-authorizing the payment. . . .
Guy [I have lots of experience designing/selling off-grid AE systems, some using EVs but don't own one. Local trips are by foot, bike and/or rapid transit].

The 'best' is the enemy of 'good enough'. Copper shot, not Silver bullets.

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