RegGuheert wrote:DanCar linked this article in another thread: ABB announced their new quick-charge stations at Busworld 2015:ABB wrote:ABB, the leading power and automation technology group, announced today that it introduces an automated fast charging system which allows electric city buses to drive 24/7, thus enabling true zero emission bus transport in cities. With its automated rooftop connection and a typical charge time of 4–6 minutes, the system can easily be integrated in existing bus lines by installing fast chargers at end points, terminals, depots and/or intermediate stops. The modular design offering 150 kW, 300 kW or 450 kW of charging power provides any city bus with enough energy in only a few minutes to run its inner-city route continuously throughout the day.
Personally, I'm not convinced that quick-charging will win out over high-capacity batteries for BEV city buses. Even though the quick-charge approach should make the buses lighter, a much larger percentage of the charging will occur during the daytime when peak electrical demand occurs. Long-range BEV buses have the benefit of being charged overnight when there is less electrical load. Of course initially both types will find service until operators can decide which approach suits their municipality best.
In the future there may be a large amount of PV power on the grid, which may make daytime (quick) charging more attractive at that time.
I'm with you, and I'd add operational reliability issues - if one enroute site is down, you need to have enough battery storage to bypass it and get to the next, which decreases the whole cost advantage of the smaller battery. Of course, if the power at the bus barn goes down, every bus is screwed, but that should be a lot less common as you can have onsite genset (fuel cell?) backup. This point also favors FCEV buses rather than BEVs in areas with frequent outages, but that decision will ultimately come down to overall cost, once BEV buses have the necessary range to serve all the required routes. To minimize disaster-related curtailment it's useful to have at least two full days of operating range autonomy onboard regardless of the source, but that raises cost, space/weight issues.