I'm confused by this part. Maybe it’s a WV thing? It sounds like, from your other statements, that WV has some issues with enabling decent charging. That’s unfortunate.
My experience in the southwest and west coast is that it’s not—in general—the charger but the vehicle that is the limiting factor. Obviously sometimes the charger is the issue.
I've done hundreds of DCFC sessions with 400 V vehicles. We use ~150 kW chargers probably around 95% of the time. This is because most of the time, the 150 kW chargers don't provide any slower charge than the 350 kW chargers and we leave the 350 kW chargers for 800V vehicle drivers who can make use of the higher rate. The chargers that provide us with the slowest charge are the 250 kW SCs.
When both the vehicle and the charger are in good condition and temperatures aren't a limiting factor, the vehicle’s charge curve is the limitation, not the charger.
The peak charge rate is a metric that is used a lot, but it's ultimately meaningless. The full curve is what matters. A couple minutes at 207 kW doesn’t substantially improve the overall charge time.
Here are two real-world examples where I charged on a 150 kW charger and a 350 kW charger. Obviously different times, different locations, so I couldn’t control all of the variables. These are just two examples I quickly pulled from my database. They’re both a little lower than the average/median of my charge rates. This is for the Mustang, which has a ~92 kWh battery operating at approximately 400 Volts.
| Date | Charger | Peak (spike) Charge Rate | Total Energy Added | Time | Average Rate (total energy divided by time spent charging) | Ending State of Charge |
| 28 May 2022 | Kingman, AZ
EA 350 kW | 207 kW | 39 kWh | 30 minutes | 78 kW | 86% |
| 18 March 2023 | Van Horn, TX
EA 150 kW
(they’ve since all been upgraded to 350 kW) | 134 kW | 41 kWh | 32 minutes | 77 kW | 84% |
I’ve charged at EA for 111 recorded charging sessions. I’ve done closer to 200 charging sessions at EA, but not all of them get sent to my account record for various reasons.
At EA, on average for the Mustang I get about 88 kW over the full charge. The median rate is 87 kW. Ford originally rated the battery at 88 kWh and later released some of its margin to ~92 kWh, but they didn’t update the charge curve to get to 92 kW. That doesn’t impact us very much.
The Lightning gets a better rate because it has a bigger battery. Its median is about 130 kW. Note that these are both very close to the 1C charge rate.
On average, I spend about 27.1 minutes at a DCFC. The median time is 27.9 minutes. That’s for around 50% added to the vehicle.
Some manufacturers allow higher than 1C charge rate averages, but Ford is very conservative with both the Mustang and the Lightning.
It really doesn’t matter if I plug into a 350 kW charger or a 150 kW charger, if everything is operating at optimum capability, the average charge rate will be around 1C for the Ford vehicles. I haven’t gathered enough data for the Silverado yet.