EV Charging, how fast can you get?

I know the Tesla super fast charger (250kW) uses liquid cooling in the cables and the car prepares the batteries by warming them to a specific temperature to be able to take the charge, but even then it probably has a ramp up time. They say you can get 1000 miles of charge in just 1 hour.


A 1.2MW charger is absolutely ludicrous, unless you have banks and banks of batteries all taking the charge evenly, or running it at HV, but if it's to do with lorries and heavy equipment, my concern would be any damage to the cables.


Now if only we could get the batteries to last longer and hold a bigger charge...

SScho:

Now if only we could get the batteries to last longer and hold a bigger charge...

Well - with my car, I have a storage system that allows me to travel a fairly long way before it needs recharging - most people call it the fuel tank  - I put diesel in mine. I like to think of it as a readily transportable, high energy density, battery !!


OMS

1.2 Mw is easily available at 33 Kv and just about doable at 11 Kv.

Presuming that we are sticking with LV for the actual charging connection and flexible thereto, then the currents are substantial but not un-manageable. A few hundred amps at 990 volts.

I don't foresee such fast chargers being hugely popular due to the costs. A lot of EV charging will probably be done overnight whilst the owner sleeps, or during the day whilst the owner is at work. A 7 KW domestic charger will fully charge most batteries overnight. A 22 KW charger at a workplace would fully charge  most batteries during a working day.

The main demand for very fast charging seems likely to be at motorway filling stations. 10 minutes of very fast charging whilst the owner uses the toilet and purchases a cup of coffee would give a significant extra mileage. Many EV batteries can achieve a 200 mile range, a 50% increase whilst making a brief stop would give 300 miles, as far as many people wish to drive in a single day.

Those willing to drive greater distances will need either a higher specification EV with a larger battery, or will need to make multiple stops.

broadgage:

1.2 Mw is easily available at 33 Kv and just about doable at 11 Kv.

 

I really meant where is it all going to come from rather than how would it get there.  By 2040 all that energy that is today coming from petrol or diesel will have to change to electricity.  Will we only be able to go out on windy days? ?

Assuming that this sort of thing is for recharging a fleet of articulated lorries, then to replace that diesel tank in the yard, a local substation (OK maybe a 33kV one) is going to be essential - a 400V 3 phase supply from 300 yards away simply won't hack it. Ideally, to keep the cable manageable, (as I have said elsewhere before)  we will at some point need to overcome our squeamishness about having higher voltages than the current 1kV limit for things to be handled by the general public, or maybe trained members of staff. After all, copper mines in Africa seem to manage to use connectors for 3000V or so to get hundreds of kW to go a decent distance, so it is not like it can't be done, it just needs the mind set. And the current method using a water cooled cable to keep the voltage below 999V is not a well thought solution - just imagine the mess if the cable develops a coolant leak.