kevin1956murray
Posts: 44
Joined: Sat Jan 19, 2019 1:29 pm

Re: ChargePoint Charging Question

Wed Jul 24, 2019 9:41 am

Now that I realize that there are "shared" and "per port" type of dual cord ChargePoint stations, I went today to charge at a "per port" station, to see how the MiEV's charging rate would look as it came out of the pause. It came out well, back to the full 3kW rate.

So the low rate after the pause sure does seem to be caused by an interaction with the ChargePoint Power Management sharing software.

I do not know why it took me so long to notice that there are two types of dual cord stations. I plan now to stay away from the "shared" stations, even though they are closer to my beaten path. I also do no know why ChargePoint customer support people have not clued me in to using "per port" stations instead.

Below is a picture of this morning's station display, showing that even though it is a dual cord station, it does not say "shared" in the orange text near the upper right. Below that is this morning's trace showing that the rate is 3kW even after the pause.

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JoeS
Site Moderator
Posts: 3727
Joined: Thu Dec 15, 2011 5:47 am
Location: Silicon Valley, California

Re: ChargePoint Charging Question

Wed Jul 24, 2019 10:39 pm

Great observation that we can tell what type of dual-port ChargePoint station that is! I'll be watching for that.

Your charge taper graph shows an unusually-long taper that goes quite low and keeps going. Mine cuts off abruptly at around 0.5kW and lasts about one hour. The graph below was taken seven years ago: the red line represents only one leg of the 240vac and the green line is solar production.

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EVs: 2 Wht/Blu SE Prem., '13 Tesla MS85, 3 156v CorbinSparrows (2 Li-ion), 24v EcoScoot(LiFePO4)
EV Conv: 156v '86 Ram PU, 144v '65 Saab 96
Hybrids: 48v1kW bike
ICE: '88 Isuzu Trooper. Mothballed: '67 Saab (orig.owner), '76 MBZ L206D RHD RV

kevin1956murray
Posts: 44
Joined: Sat Jan 19, 2019 1:29 pm

Re: ChargePoint Charging Question

Thu Jul 25, 2019 4:05 am

I too had noticed that Tuesday's taper was quite shallow and long. I know that because I was sitting by the car in Texas heat, waiting for it to finish, in hopes of seeing exactly what the station display would show. I finally gave up.

Yesterday's taper looked more like your graph (as I was monitoring the trace on the app), but now it is more condensed since I did not get back to the fully charged car in a timely fashion. (Graph below.)

Anyway, I'll be watching that, by looking for a taper that is about an hour long, on a station that I know is pushing 240V.

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kevin1956murray
Posts: 44
Joined: Sat Jan 19, 2019 1:29 pm

Re: ChargePoint Charging Question

Thu Jul 25, 2019 12:30 pm

Below is today's charge, showing what looks like a normal (not shallow) end taper. So I'm thinking my old MiEV is still OK.

I am not sure why that end taper was so shallow the other day. It could be because of the throttling of the "shared" line, even though no other car was plugged in. Or it could have been the result of me pressing the release button near the end, as an experiment to see if the trace would glitch upwards.

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kevin1956murray
Posts: 44
Joined: Sat Jan 19, 2019 1:29 pm

Re: ChargePoint Charging Question

Sun Jul 28, 2019 8:24 am

I have just realized that the ChargePoint website indicates a "shared" station in the 'more info' popup, by turning a little wishbone icon (lower right of the popup box) blue.

The Parmer station shown just below is shared, where as the Nordstrom station screenshot below that is not shared (the 'wishbone' split wye is very faint).

The app shows it too, but in a different way. Shared stations say "shared" at the 'Start Charge' page. (Unshared stations do not say shared.)

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Last edited by kevin1956murray on Sun Jul 28, 2019 8:26 am, edited 1 time in total.

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