Tbobz wrote: ↑
Wed Jan 01, 2020 9:03 pm
Dave- Dr. Holland writes this in the article
"A useful partial solution would be to allow customers to manually set a peak charging rate (below the safe limit) that minimises heat gain and gets predictable results. The rate options should be 20 to 35 kW in 2.5 kW increments. Grey out/disable higher powered options as they become unavailable due to overheating risk. Ideally, make the power curves on these options flatter and less peaky (peaky = heaty). This will allow the customer to access more modest but more sustainable charging power and less overall heat gain during a long journey.
46 kW charging (adding 70%) takes 38–40 mins, but adds 20° Celsius of heat. 28 kW takes 53 mins, but adds half the heat. 23 kW charging takes 64 minutes, but adds just one quarter of the heat. 23 kW (or 22.5) would be ideal for a meal break, for example. These manual options would make a big difference to the user experience on a long journey."
The idea is to avoid, or at least, delay for a meaningful time, excessive battery heat when driving the Leaf on a long journey.
a statement w/o regards to the size of the battery is simply folly.
to wit; On December 31st; I did a free NCTC charge session on EVGO. Lasted "around" 30 mins which charge rate at 120-121 amps for the duration. I received 22.9 kwh.
Battery temps started at 51.0/51.6/52.0
Battery temps ended at 71.4/72.0/73.4
The largest increase was 21.4º F or 13.4ºC
But that isn't even the issue. We are talking about a woefully overwhelmed network. Increasing charging time on a such a vital resource is a good idea how? What gives you the right to make this decision on your own? In a per minute billing scheme; its one thing to decide to pay the extra money for the increased time to charge but in the new Pay per kwh scheme California is so enamoured over, you simply don't have the right! In my case; a 23 kw charging rate would be well over 2 hours!
Now, if there was an abundance of money to add charging stations that cater to every need, then fine. Let me know when that happens.
2011 SL; 44,598 mi, 87% SOH. 2013 S; 44,840 mi, 91% SOH. 2016 S30; 29,413 mi, 99% SOH. 2018 S; 25,185 mi, SOH 92.23%. 2019 S Plus; 3500.3 mi, 96.95% SOH
My Blog; http://daveinolywa.blogspot.com
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