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EV Charging

Roger B

A couple of interesting reads on EVs:

The first looks at how to reimburse company car users when they charge their vehicles at home and the problems of the different tariffs.

https://www.fleetnews.co.uk/features/charging-evs-at-home-what-fleet-managers-need-to-know

The second is looking at electric trucks, including mention of the Megawatt Charging System (MCS).

“In addition to the CCS standard with up to 375kW, MAN is offering the even more powerful megawatt charging standard (MCS) for fast intermediate charging during breaks from driving.

This will initially enable up to 750kW, with over 1MW of charging power on the horizon.

It will be available from 2025 onwards he stated, and will be capable of getting a truck’s battery pack from 10% to 80% of its charging capacity in no more than half-an-hour.”

https://www.fleetnews.co.uk/features/man-gears-up-for-sustainable-future-with-electric-and-autonomous-vehicles

The MCS will require some significant infrastructure and MV/HV feeders.

Parents

  • Certainly will need more than the usual dedicated LV line ;-)

    More technical meat in this paper

    https://www.charin.global/media/pages/technology/knowledge-base/c708ba3361-1670238823/whitepaper_megawatt_charging_system_1.0.pdf

    note references to 1500V DC  and charging currents up to 3kA (not at the same time) in the text.

    The section on potential fault currents makes eye watering reading.

    The short circuit current should be limited by the vehicle to a peak current of 70kA and 12MA²s
    between the DC+ and DC- terminals. The EV supply equipment shall limit the peak current to 30kA and
    1MA²s at the vehicle connector. In case of two independent faults (one in the vehicle and one in the EV
    supply equipment) a short circuit current may flow through the protective conductor. Based on the added
    impedance of the charging cable, the peak current will be limited to 55kA, and 11MA²s.

    And we worry about fault currents from 1MVA substations!!

    a few dozen chargers like that  would make anything like the Eddie Stobart depot into  a major node on the national grid.

     

    Mike

  • in reply to mapj1

    ||||Looks like we need a power station at every motorway charging point for trucks. Could be a mini nuclear site.

  • in reply to CliveS

    And when there are no trucks to charge, maybe they could be making some hydrogen or other storage mechanism? I assume they can switch between loads pretty quickly, just not on and off quick.

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  • in reply to CliveS

    And when there are no trucks to charge, maybe they could be making some hydrogen or other storage mechanism? I assume they can switch between loads pretty quickly, just not on and off quick.

Children
  • in reply to Roger Greenwood

    Yes, Roger, the power plant would obviously be synchronised with the grid so could generate or receive from it.  If we could miniaturise the nuclear to the size of a submarine we may even be able to run it on automatic with just a maintenance engineer or two onsite, in case of a problem. 

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