GRA wrote: ↑
Fri Sep 18, 2020 9:24 pm
^^^ Uh huh, and now with per kWh pricing no one will care what SoC they start at, or how their particular car charging profile tapers,
or what the ambient or battery temp is and how that will affect their charge rate.
Instead, they will know exactly how much a given # of kWh will cost them without needing to consider any of that. Simple just like buying gas, and makes comparing prices easy. If you think station/network A is expensive, anyone can easily determine if station/network B is less expensive.
The bolded part is the potential problem. People could tie up the station as their car slows to crawl. The red line in the graph of https://www.chevybolt.org/threads/best- ... 15&slide=0
is about right. Max charging rate eventually goes from (approx) 55 kW to 37 kW to 25 kW to 17 kW to 11 kW and 9 kW when really near full.
Instead of people being incentivized on a trip to only get enough + some buffer to get to the next stop and maximize charging rate/keep costs down, they might charge all the way to full, tying up the station.
In Jeff's movie at https://electricrevs.com/2018/07/17/wat ... -to-55-kw/
, you'll notice from the 60 to 90 minute mark, he only got about 10 kWh. He or the car or charger terminated it before it slowed to 9 kW or less (I've taken my Bolt to that point before). If his session ran longer, the last 30 minutes would've had a couple kWh less dispensed.
Yet in the 1st 30 minutes, he got about 26 kWh.
Network B, C, etc. might not have per kWh rates. EVgo in CA is still charging by the minute. There are other chargers that charge by time or a combo of time and energy.