May Charging Log

DerekS

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If anyone is interested this is my charging log for the month of May.

My electric rate is $0.089705/kWh.

5/6/2022 25.23 kWh: $2.26
5/7/2022 28.37 kWh: $2.54
5/9/2022 18.581 kWh: $7.14 NOTE: EVGo fast DC charger
5/11/2022 14.03 kWh: $1.26
5/14/2022 15.62 kWh: $1.40
5/14/2022 42.84 kWh: $3.84
5/14/2022 29.00 kWh: $0.00 NOTE: FREE Electrify America charger
5/15/2022 18.15 kWh: $1.63
5/18/2022 4.24 kWh: $0.38
5/18/2022 39.00 kWh: $0.00 NOTE: FREE Electrify America charger
5/19/2022 19.08 kWh: $1.71
5/20/2022 21.65 kWh: $1.94
5/20/2022 6.40 kWh: $0.57
5/24/2022 18.69 kWh: $1.68
5/25/2022 28.07 kWh: $2.52
5/25/2022 22.79 kWh: $2.04
5/26/2022 20.42 kWh: $1.83
5/27/2022 19.53 kWh: $1.75
5/28/2022 24.08 kWh: $2.16
5/31/2022 27.42 kWh: $2.46

Miles Start 15885
Miles End 17179
Home Charging $34.16
Fast DC Charging $7.14
Total $41.30
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WattTurbo

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Quite frugal your car. What really helped you is your low electricity rate. You must have been locked in a contract before the rates skyrocketed. Once you renew, your cost to drive it would probably double since the rates I am seeing now is around $0.18/kWh and up.
 
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DerekS

DerekS

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I retrieved the kWh use values from the web server on the Porsche Charger Plus, if anyone is curious.

I'm considering writing an app to enter/store this stuff, and perhaps even fetch it from the web server automatically. If that's a thing you'd be interested in for a couple dollars, LMK.
 

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DerekS

DerekS

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@WattTurbo are you on TXU?

They have a "Green Energy" plan with free electricity all night starting at 8pm!
 

WattTurbo

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@WattTurbo are you on TXU?

They have a "Green Energy" plan with free electricity all night starting at 8pm!
No, I'm with Amigo right now. The current contract is expiring in a month so I am expecting them to send me a renewal offer soon. I've been using PowerToChoose to find the best rates, but now Centerpoint has been charging a $150 fee for switching so unless the rates is low enough to cover that, I'd have to stick with Amigo.
 


WasserGKuehlt

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I retrieved the kWh use values from the web server on the Porsche Charger Plus, if anyone is curious.
Resurrecting this thread, as I was looking for a way to access the car’s charging log. @DerekS did you set up a power line connection for the charger to upload data, or does it store the log on its own? That is, could I retrieve this log for past sessions?

As far as I can tell, the charging log is not accessible from PCM, nor is it available via the Porsche app or website..

Thanks for any hints.
 
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DerekS

DerekS

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I set up a powerline network and hit the charger with a web browser.

It sucked though, it only showed the last 3 charging sessions.

I’ve since moved to a Wallbox which has a much better app and web interface. And it can do 40 amps without overheating.
 

WasserGKuehlt

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Thanks. My outlet is on its own circuit, and I’m not sure if I can set up a PLC across breakers.
It’s a bit weird the backend has a record for every driving session (even moving it) but nothing on charging..
 

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My ChargePoint provides all of these data too - here are a few examples (you can dig deeper into individual charge sessions by clinking any entry here and shows graphs etc):

Also I have a fixed rate plan but was locked in long term (years) and will need to be renewed in 2024. But seems to be a decent rate (despite it being higher because its fixed but I never worry about massive overcharges when the grid goes awry as we know from recent past experience in TX!).

Now I have not entered my actual rate from Centerpoint/Reliant into ChargePoint's app and they are simply grabbing posted general rates (mine is actually better as negotiated).

Also for more first plot here is my entire AC and DC charging history in respect the 'estimated' post-AC charging ranges for Normal and Range mode with AC off (as posted elsewhere):

EDIT: data on right (text summary) not up to date - will update shortly

Porsche Taycan May Charging Log Screenshot 2023-01-31 at 10.02.58 AM


Porsche Taycan May Charging Log IMG_0237.PNG



We were in NZ all month :) re Dec!
Porsche Taycan May Charging Log IMG_0238.PNG


Porsche Taycan May Charging Log IMG_0239.PNG


Porsche Taycan May Charging Log IMG_0240.PNG


Porsche Taycan May Charging Log IMG_0241.PNG
 
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WasserGKuehlt

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Thanks, all, for sharing your data. To add a bit more context on my inquiry, I'm trying to figure out an optimal charging schedule. My utility provider does not do preferential pricing by time-of-day (instead, it's a 2 tier pricing model, with the first ~660kWh at the lower price), so the optimization is aimed at the following goals:
- reasonable SoC on a given day, so that topping off for an unexpected longer trip doesn't require more than ~2hrs advance notice
- as much as possible avoid conflict with other large consumers in the household (furnace or vacuum starting, etc.)
- I has new toy, wanna play with it

For now, I'm running the PMC+, which seems to work just fine at 100%. Out of an abundance of caution, though, I'd prefer to run it at 50% but I'm having a hard time finding out exactly how much energy is actually needed from a given SoC starting state to reach the desired SoC target. For instance, there were days when I plugged in at a lowish SoC (PMC at 50% current), got an ETA for completion of "next afternoon", and yet charging completed by the morning (direct charging, and by 'completed' here I mean it went to ~90% SoC). I guess the car itself has not yet figured out its actual charging rate at higher SoC levels?

Back on point, the ideal behavior would be:
- plug in the early evening, at 20-30 SoC
- _don't_ start charging until 11pm-ish
- charge till ~7am or 85% SoC
(basically a scheduled direct charging, but without manual input)

I've tried to extrapolate the charge rate and energy from the trip data, but something is off; e.g.: 16 electrical miles at 2.3mi/kWh represented a discharge of ~7% (86 to 79 SoC; not sure if the cost of heating is reflected in either the consumption or the SoC estimate), but that would mean a ~99.3kWh total capacity, which is .. wrong.

Taking the inverse approach - what the EVSE can deliver at 50% rate over ~9 hrs seems to be 39.6kWh, which is ~44% of a (presumably) 90kWh total capacity. Counting back from a goal of 80-85% SoC, that'd mean I can achieve my goal by plugging in with about ~41% SoC (and setting the preferred times and SoC targets as above).

The mismatch in calculated energy/capacity bothers me, though, and I'm not sure if the SoC itself is trustworthy, or the electrical miles measures really just power delivered for motion (so heat and lights are unaccounted for). If I could corroborate the trip data with an actual charging log, I could then sleep soundly (or find something else to worry about).

I'm going to try a PLC adaptor, and will report back.
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