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Preconditioning for fast charging, worth it?
- Thread starter davraker
- Start date
YEah, that's why I always periodically check what the arrival SoC is... I know one time I left the SC, and it said I was going to arrive at my destination at 25%. It started raining heavily shortly after I left. (Was not windy). The estimate changed to 9% about halfway thru the leg. I actually arrived at 10%. So I always trust the arrival SoC... I just make sure to always pad the initial estimate while I'm charging.
Yeah, I wish it was at the bottom of the nav window instead of having to open up the entire step-by-step window and scroll to the bottom.
On road trips I set the energy app to a shortcut at the bottom with the new V11 UI and so it becomes a one push to open the trip energy screen (after first time opening and selecting trip graph) and one push to close. This way I can quickly check destination % periodically between superchargers. It's much easier than opening up the step-by-step and scrolling to the bottom, especially if you have a lot of turns.
Obviously having it displayed where you could see it without pushing anything is optimal but this is the easiest work-around I could think of.
Last Weekend I did another trip from my Snohomish, WA to Portland, OR where I charged at the Kelso Supercharger going both directions.
From Snohomish to Kelso (4/2)
- Distance = just over 150 miles
- Ambient Temp = 55F (or so)
- Rain = None to Moderate
- Charge Leaving = 90%
- Range estimate to the Target at the location = 19%
- Range estimate to the Supercharger at the location = 16% (the difference is accounting for preconditioning)
- Driving time elapsed before car started to precondition = 15 minutes (roughly)
- Driver behind the wheel stopped the preconditioning = Yes
- Why driver stopped the preconditioning = Lack of trust, and desire to control situation
- When did human allow preconditioning = Last 45 min of lag
- Any Range issues = No, it was decent for the conditions and speed
- Any charge issue = Nope, started charge at 1K miles and then tapered per normal
From Portland to Kelso (4/3)
- Distance = just over 45 miles (or so)
- Ambient Temp = 55F (or so)
- Rain = None to Moderate
- Charge Leaving = Did not record
- Range estimate to the Target at the location = Did not record
- Range estimate to the Supercharger at the location = Did not record
- Driving time elapsed before car started to precondition = Immediately
- Driver behind the wheel stopped the preconditioning = No
- Any Range issues = No, didn't care and seemed like typical preconditioning
- Distance = just over 150 miles
- Ambient Temp = 50F (or so)
- Rain = Light to Moderate
- Charge = 90%
- Range estimate to Snohomish = 8%
- Did driver leave with only 8% = No
- Charge = 95%
- Range estimate to Snohomish = 14%
- Actual Range at arrival in Snohomish = 25% (this included stopping for Chipotle which added mileage)
This is the second time within the last month or so that its estimating crazy energy consumptions for the trip from a Supercharger to my house. Normally the range estimate always underestimate how much energy I'll use as I generally drive 10 over unless something prevents me from doing so. The last time it was estimating 75% of the battery range to do 100 miles.
I think there is a bug between preconditioning and the trip planner where it reports abnormally high energy consumption on the way to a destination from a charger in which it preconditioned for.
I've also been having issues with just getting the rotating circle with an arrow where it takes a long time to show the estimate.
Hi, trying to understand if supercharging without pre heating could have any adverse effect on the battery ? I know that the charge speed is throttled, but just wanted to make sure.
Sometimes I prefer to not pre heat in order to have a bit longer at the mall otherwise it’s just too quick and I’d end up paying extra for not unplugging post charge.
you answered your own question. cold battery = slow charging. You cannot escape the law of physics and thermodynamics. Chemical reaction slows down in the battery cells when cold.
Yes. I know that BMS takes care of it and reduces the charge speed to protect the battery. I just wanted to make sure that this is surely bullet proof.
(Love my Tesla too much
)Well nothing is 100% but with Tesla batteries lasting 200k-plus miles, it seems like they have it down pretty well...Yes. I know that BMS takes care of it and reduces the charge speed to protect the battery. I just wanted to make sure that this is surely bullet proof.
(Love my Tesla too much
Watts_Up
Well-Known Member
Regarding the topic of "Preconditioning for fast charging, worth it?"
Bjørn Nyland in this video Tesla Model S LR Palladium charging test & cold battery test
was comparing charging from 10% to 90%:
I don't want to spill the bean, but the study was quite interesting.
Bjørn Nyland in this video Tesla Model S LR Palladium charging test & cold battery test
was comparing charging from 10% to 90%:
- a Model S Plaid with cold battery
- a Model S Plaid with pre-heated battery
- a Model S LR with pre-heated battery
I don't want to spill the bean, but the study was quite interesting.
SageBrush
REJECT Fascism
It is an interesting question, and only Tesla knows the answer. The pack damage mechanism is from Li plating. The phenomenon is well described so I think Tesla *can* modulate charging speed so that the Li plating effects are similar at different pack temperatures. How closely they toe the line is unknown.
The only Tesla we have access to is the customer care. They’re level 1 folks who don’t know much about the product and it’s functioning and spit out lines they were taught for x, y, z conditions. I tried. The dude had no idea what I meant.
(I even had to educate him about the battery size and the charging capacity of my Tesla)
andaconda
Active Member
This is a lengthy thread, but I'll throw in my 2 cents
I live in a state that charges by the minute, not by the Kwh that is put into the car.
As an example - if I anticipate using a ccs charger I will precondition about 20 mins before my arrival - that way those first few minutes I can pull 150~160 kw - and then it ramps down to about 70~80 when I near 80% SOC. So it does save a quite a bit in charging cost. Now on the other hand if I were to go to a Tesla charger - preconditioning doesn't make that much difference, because Tesla charges on a sliding tier scale. Tesla charges more for the first few minutes of your charge whereas the ccs chargers are a flat rate through the whole charge.
I live in a state that charges by the minute, not by the Kwh that is put into the car.
As an example - if I anticipate using a ccs charger I will precondition about 20 mins before my arrival - that way those first few minutes I can pull 150~160 kw - and then it ramps down to about 70~80 when I near 80% SOC. So it does save a quite a bit in charging cost. Now on the other hand if I were to go to a Tesla charger - preconditioning doesn't make that much difference, because Tesla charges on a sliding tier scale. Tesla charges more for the first few minutes of your charge whereas the ccs chargers are a flat rate through the whole charge.
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