[ref http://electric-vehicle-discussion-list.413529.n4.nabble.com/EVLN-Flash-charging-set-to-revolutionize-EV-travel-video-tp4663412p4663426.html ] > The 400kW charger would top up 80% of the Leaf pack (20 of the 24 kWh) in 1/20 hour, which is 3 minutes. Sweet. Cor van de Water <
To help others keep things in perspective, Cor also pointed out that every ice on the highway is wasting huge amounts of energy as heat. With that in mind, since a ~300mi Tesla-S has an 85kWh pack http://www.teslamotors.com/models/options then using ratios, to recharge it would take ((85/24)*3min=) ~11minutes. That is hardly enough time for a restroom break, and purchase your beverage/munchies. If in the way future the flash EVSE got enough continuous business, the EVs would have to be queued-up (like a car-wash) so the EVSE would be at its maximum utilization. Which bring to mind some other questions/grey-cell-exercises to gain perspective. To many, ice-racers (formula 1?) are a familiar item. At a pit stop, don't ice race cars take on a huge amount of energy during the quick refuel? -How many gallons of gasoline do those ice race cars take on? -How many kW is that? -What would be an equivalent capability/performance ice vehicle to a Tesla-S? -What would be that ice vehicle's kW/mi vs Tesla-S kW/mi @65mph ? -And what is the equivalent amount of gasoline for the energy the flash-EVSE uses to replenish the (20/24*85kW= ) ~70.8kW to bring the Tesla-S pack from 10% to 80%SOC? With those answers, my hope is that I could compare apples with apples for the public to understand. {brucedp.150m.com} - [ref http://electric-vehicle-discussion-list.413529.n4.nabble.com/EVLN-Flash-charging-set-to-revolutionize-EV-travel-video-tp4663412p4663431.html ] On Wed, Jun 5, 2013, at 08:54 PM, Cor van de Water wrote: > This is not for typical home use but utility-size equipment. > Utilities are used to dealing with stuff like this and if the waste > is significant enough to cost money then they will make sure that > the designer of the equipment knows what to design for. > Not that the typical building transformer is particularly efficient, > even though it *can* be - I am always amazed when I walk into the > utility room and am greeted with a loud hum and a lot of heat because > the building transformer is almost cooking hot.... > Since that waste is likely paid by the customer since it is *after* > the meter, the utility does not care much. But I expect that if it > is unmetered then they *do* care about waste. > However, if the electricity cost to the utility is about $1 and they > can charge $10 or $20 for a flash fillup then they probably do not care > much > about 20% waste of that $1.... > > BTW, note that *every* ICE has a waste heat in the order of 100kW > when running at freeway speed and they can easily do this for hours at a > time > so apparently that amount of waste is not so big a deal for a 3-min > period > if you see it in that perspective. Use the radiator of an ICE and you can > cool the 400kW charger while still being *way* more efficient than an > ICE. - -- http://www.fastmail.fm - mmm... Fastmail... _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
