A technology of flash charging of Electric Buses in 20 Sec @ 600 kW is mentioned. On simple calculation it is found that more than 1500 A current @ 400 V infrastucture will be needed. Further it has many limitations for gap of bus stands which sideline it from fuel buses. Kindly see the limitations in attachment and advise in interest of public to save Global Climate Change.
It is not train, hence for electric road transport, metallic strip are used, running on road. Compare to over head lines, it is more economical, efficient, reliable and easy for maintenance....
a) Depending on the energy storage limitations- fast charging of some solutions might cause quicker degradation, shorter lifetime thus the sustainability of the solution might suffer;
b) From economic perspectives, if the ESS is designed properly, such solution is viable and sustainable for the city buses;
c) Stability of the grid is another question and it depends on the connection to the grid, related substation and used road side ESS to provide high current solution.
Overall, if high penetration of renewable energy sources is presented, EV system will show higher sustainability on the long run.
VAH ( voltage x Current x time) , the three variables shall maintain capacity of recharge.
Fast Charging must need high current at limited voltage i.e 100 kWH ( 100k VA hrs) will need 30000 Amps current for 3 sec @ 400V or 25 A for 10 hrs @ 400 V.
2. Overhead supply for regular driving of EV (mileage 2 units) will need only 12 Amp @ 600 V only without any storage.
3. Distributed energy plants ( green or thermal) to feed EVs on remote highways or roads.
4. Green energy plants to feed EVs in residential areas for door to door travel.
5. Finally fast charging is not solution for Zero Emissions to save Climate Change.
Question is related to charging capacity.
Mr. Martin, as per your mileage data 2kWh/ km will need 360kVA charger for 20 sec. Further 2kWh will need minimum 3600 A @100 V or 600 A @600 V for 20 sec.
Fast Charging is not concern with battery but ultra capacitors or supercapacitor to collect energy in short time and facilitate to charge batteries as per their normal charging capacity.
Is it economical to install 360 k VA substation at each km or laying of overhead supply line directly to feed EVs to drive long distance without batteries?
A very simple electric network across road/highways and current collector shall help road transport directly feeded from directly Grid supply using a current collector and charging points for light vehicles using various onboard supplies convert to zero emissions suitable for Natural Climate.
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