Using Ed's equation with Cor's corrections, and adding in the energy
lost to 90% efficiency (waste heat and the energy to cool it all off):
My assumptions:
0 to 80% in 10 minutes requires a 400kW burst + 10% losses = the actual
total power used.
400kW * 1.1 = 440kW during that short 10 minute duration (to recharge a
300 mile range pack to 80%SOC or regain 240 miles).
Assuming Tesla's Ultracharger becomes a standard (Level-4 ?) that all
other EVs will emulate / want to use ...
If a public level-3 EVSE use-fee is to be $8 (non-blink-member-rate in
the SFBA) for a 30 minute charge, ...
? How much would the EVSE company ding a driver for this 10 minute L4
EVSE charge?
Its 3 times faster, so 3+ times more costly? ~$30
That seems way too low a price for the convenience.
And what about any heat build up in the pack as it reaches 80%SOC?
Cor mentioned that there would need to be a design change, but keeping
that pack cool to ensure its longevity would important.
What additional hardware will be needed to keep the pack cool while it
is L4 charging?
Lastly, there has been lots-o-newswire chatter about a new-and-improved
li-ion chemistry/manufacturing processes that will bump up the energy
density, thus lowering the pack cost. Let's assume Tesla-S' 300 mile
range doubles, so now we are talking a 20 minute L4 EVSE use-fee at
what? ~$60+ to regain 480 miles?
Assuming a comparable ice that gets 35 mpge, that would be ...
$60+ / (480 miles / 35 mpge) or ($60 / 13.72 gallons) = $4.37 gallon
That is not that far off into the future, that a driver would not mind
paying for not having to wait.
I ask that more knowledgeable members check my math, and give
corrections/comments.
{brucedp.150m.com}
(From my pclinuxos-lxde-2013.07 desktop)
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