GMC HUMMER EV Forum | HummerChat.com banner
1 - 6 of 6 Posts

· Registered
GMC Sierra, Bolt, Sky, Mach E
Joined
·
876 Posts
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.
 

· Registered
GMC Sierra, Bolt, Sky, Mach E
Joined
·
876 Posts
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?
 

· Registered
GMC Sierra, Bolt, Sky, Mach E
Joined
·
876 Posts
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.
 

· Registered
GMC Sierra, Bolt, Sky, Mach E
Joined
·
876 Posts
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.
 

· Registered
GMC Sierra, Bolt, Sky, Mach E
Joined
·
876 Posts

· Registered
GMC Sierra, Bolt, Sky, Mach E
Joined
·
876 Posts
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.

View attachment 1948
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.
 
1 - 6 of 6 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top