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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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You cannot expect fast charging to be inexpensive like home charging. These charging companies get hit with demand charges by the electric companies and that costs them a lot of money. I charge my EVs at home during off peak hours only, and it costs 0.06/kWh. On long road trips I probably spend about the same amount as I would for gas.
 

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My wife and I bought a GM buyback Bolt in September of 2019. I've never charged it at home. Thus far, I've only used Charge Point and Greenlots (a Shell Oil company) free public chargers so I am yet to spend a single cent on charging the car. Iowa actually has a good EV charging infrastructure thanks to MidAmerican Energy, which has been installing 50-150 kW DC units throughout the state. There's a 150 kW charger near the grocery store we go to so we charge up then. There is more competition for the chargers lately though.
 

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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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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.
View attachment 1854
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?
 

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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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So there is a report out on one of the Inside EVs podcasts that EA is limiting many of the 350kw chargers to 350A, apparently the older ABB units. That would definitely keep the Hummer charging curve below 300kw on those chargers, if that is true. It sounds like the newer Signet units are not affected.
 
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