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Discussion Starter · #1 · (Edited)
Got here and there was a prototype SUV. Chatted him up and forgot to get a picture of both vehicles.
Started off at the 150kW station because both the 350s were in use. Speed when I unplugged to move was 136kW.

Now on the 350kW station, started at 33%. No idea if this is all the current it is going to get, I had the force battery conditioning on the whole 45 minutes drive. At 45% and the rate is slowly climbing up, at 232kW now. Lots of noise coming from below the truck.

Planning on sticking around until it tapers off, no video though.

225kW at 61%
Started to fall off at 64%, 20 minutes into the session.
150kW at 65%
125kW at 69%
Wife texted me to tell me to go inside to grab some stuff. Got back out and it was at 81% doing 28kW. Not sure when it really fell off a cliff but it looks like I'm going to plan to keep sessions under 65% on our trip.

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Discussion Starter · #7 ·
Some other observations I didn't share earlier.

On 800V charging, it does split it into two packs, but it doesn't seem to just put them in series. The BECM displays information about the split. I don't really know why the values in here are the way they are, each pack has a positive voltage and negative voltage that vary by quite a bit, but the actual stated voltage between the two packs tracked pretty closely. At this one instance in time, I was observing pack 1 at 360.22V, pack 2 at 361.00V. Power sharing seems to be continually adjusted on a frequency of about 1/5 hz, graph looks like a modified sawtooth.

The number being reported about charging power didn't make sense, was a maxed out 16 bit unsigned integer, but the current didn't make sense either, it was displaying ~1200A. But doing some calculations off it, I'm wondering if taking the 65.535 kw * current / pack voltage wouldn't give me the actual charge rate in kW, since that number is awfully close to what I think I was observing at the time.
 

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Discussion Starter · #14 ·
This is the session that bugged out on us. It actually went to over 80% charge. Interesting that they must have also lost the data for the remainder of the session. Demonstrates we averaged 255kW from 11-39% in 30F weather though, so that's pretty neat.
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Discussion Starter · #16 ·
That is pretty good for that temperature. So I guess you got some free charging for the rest of the session. I had a session using my plug and charge on my Mach E where I went for a bathroom break and came back with the charger screen stuck in "initiating". It had actually been charging the car during the whole time, but I never did get charged for that session. My Fordpass app never gave me any alerts that it had stopped charging. With plug & charge there is no info available in the EA app it is done totally via Ford, including billing.

Can you see any charging session info in the MyGMC app? Or get any alerts?
I still got the alert over SMS that it hit 80% but both the EA and GMC apps weren't giving me status.
 

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Discussion Starter · #17 ·
EA is going to go bankrupt with this per-minute pricing. Saw 275kW in the truck just before I kicked it off the charger so we could keep going. Just enough time for two runs into Walmart to use the bathroom. High 60s outside temp. Truck automatically conditioned for this stop, we navigated to our destination, it suggested we add a stop, the EA station was in the list so we selected it.
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Discussion Starter · #20 ·
This taper at 80% is awful. Hopefully GM can improve it a bit. Was hoping to get a small buffer for tomorrow's first leg but I'd rather add another 5 minute stop.
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Discussion Starter · #25 ·
My Mach E was dropping to 12kw at 80%, then I got a software update that increased it to 44kw. There is also some speculation that GM added a battery check at 80% as a result of the Bolt fires. Lowering the charge rate and checking cell balance. I can see my Bolt cycling the power even on my ChargePoint L2 during long charges at home. That is happening with my new battery.

Hyundai was doing something similar on the Kona, after their fires. It could be interesting to go past 80% and see if it ramps up again. someone saw this when they did a fast charge on one of the new Hyundai EVs.
It might, but at 81% dropping down to 20kW, I had enough waiting.
 

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Discussion Starter · #27 ·
Highest I've ever actually witnessed so far. Taper started right after this point. We plugged in at ~34% and the automatic preconditioning kicked on way before we arrived.

I am wondering if they do some kind of a controlled increase in charge rate the more you DC charge the truck, I saw some reset function mentioned in the dealer tools that sounded like it could be for that.

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Discussion Starter · #29 ·
What brand of charger, ABB or Signet? The reason I ask is that the ABB 350kw chargers have a 400A current limit. So at 720V nominal, you will only be able to get 290kw. A Signet charger with 500A will allow 350kw at that voltage.
It was raining out, didn't feel like looking at them.
 
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