BENCHMARK PLAN
I'll make three loops doing: SuperCharger, Electrify America, and EVgo. I'll leave Huntsville with a 15% SOC (36 mi) reserve and drive to Chattanooga, to normalize the SR+M3. There I will charge enough to have a 15% reserve (36 mi) to the same charger network in Nashville. Finally I'll charge to reach the free, CHAdeMO/CCS charger in Huntsville before heading home.
The goals:
- Cost of each SuperCharger, CHAdeMO via Electrify America, and CHAdeMO via EVgo.
- Charging profile at each network, the charge as a function of time recorded using "Time Lapse"
There is an Athens AL SuperCharger but it isn't clear we gain anything as I've already got a Nashville-to-Athens benchmark and a full SuperCharger record. However, there has been a suggestion that since my last video recording of a full charge, the SuperCharger profile may have changed. I will monitor and decide on the way back if another, full charge session is needed.
INITIAL TESTING
I borrowed a CHAdeMO adapter and went to the local, free CCS-1/CHAdeMO charging station to make sure everything works:
Past experience with my BMW i3-REx revealed we never get more than 100A from this unit. So the actual kW is driven by the battery battery voltage until the taper begins to reduce the current.
My first test, dangled the adapter and cable but it shutdown in a few minutes:
I suspect the tension on the adapter-cable or the heavy torque on the Tesla port cause a momentary, electrical problem triggering the abort.
Initial charging rate is consistent with the SOC of the Tesla:
After the abort, I draped the CHAdeMO adapter and cable over the back of the car and there were no more interruptions:
It looks like a strap from inside the car out the rear glass could hold the adapter and cable up to offload the mechanical stress on the connectors. I'll do some experiments.
To protect the paint, a blanket or throw rug might keep the cable from direct contact with the car:
However, I could try parking on the wrong side of the street so the cable does not stretch across the car.
As the charge tapered down, the voltage was higher but the current significantly smaller, about half the initial value:
Bob Wilson