abasile wrote:However, it seems to be a trend that many QC units are set to shut off after reaching "80%" or "90%", numbers that continue to be inflated due to a LEAF software bug.
On the Blink, did you override the charge to stop at 100%? Do you have last year's P3227 update? Someone said that they noticed the car would continue to charge past 80% after the P3227 even after starting below 50%.
abasile wrote:On the other hand, for a QC site to be relied on by anyone resembling the general public, it should possess multiple chargers, be available 24/7, and be priced no more than gasoline for a Prius. Basically, it needs to resemble a gas station (or SuperCharger site). I have to admit that it took me a while to come to appreciate the need for this approach.
Definitely. Tesla made the right call by installing more plugs per location as it improves efficiency of the stations as a whole while minimizing risk of a user being stranded or finding all stations busy. As a software engineer, you would probably enjoy this thread: Capacity of Charging Stations Using an Erlang-B Model
abasile wrote:Of course, such an approach necessitates substantial subsidies from interested parties (car makers and/or government) and would be helped by lowering/eliminating electric demand charges for EVs.
Yes, something to help mitigate demand charges for EV charging would help a lot. But still, smarter charging infrastructure would also go a long ways towards minimizing those charges. Again, one just has to look at Tesla for a model.
Let's just look at the QC station around the I10/I215 interchange that you are near. There are 3 different QCs within 7 miles. All have suffered from various states of unavailability over the last 3 months while ringing up 50 kW of demand charges every single month they have been running.
Instead of scattering those stations around, wouldn't it be better to have all 3 stations at the same spot near the I10 / I215 interchange? Install a communications module that limits the maximum total demand for all three stations combined to 60 kW. If the comms module fails, just limit each to 20 kW by default so none are dependent on the other to function. As further backup and to assist non-QC vehicles, install 2 CT4000 J1772 stations.
Install these every 20-40 miles along major thorough fairs like the I10/I215 interchange. Now you minimize the cost of charging infrastructure cost to provide reliable regional mobility. To fill in the holes, add J1772 stations, but always install at least 2 and preferably 4 plugs per location. All stations should ideally be located near restaurants and/or shopping and/or parks to help pass the time if needed, be located away from prime parking and have parking time limits - 45 minutes for QC spots, 4 hours for L2 spots with perhaps provisions for overnight parking if desirable. Finally, all spots should be able to reach multiple parking spots to minimize the effect of being ICEd or other inconsiderate plug-in drivers who hog spots.
Oh well, one can dream.
TomT wrote:Yep, that is why I consider single QCs to be worthless for any trip that is even remotely mission critical...
So you're saying that you can't rely on QCs at all? I think there's basically only a few locations in all of the USA where there's more than one CHAdeMO station per location.