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Charge Slowed from 220kw to 45kw

Peter 224

Member
May 9, 2021
456
299
Salisbury
I needed to charge after a home to LHR and return, starting with about 190 miles showing, I arrived home with 7% showing, so I charged up to 15% before driving 10 miles to the Amesbury Supercharger to grab some of the free miles I have in my loot box.
The satnav started "preparing. for fast charge" and it had finished as I arrived in Amesbury.
My car is a Q2 M3LR, MiC.
The Amesbury chargers are V3, nominally 250kw.
3 of 16 chargers were in use, I was No 4. .

When I plugged in the charge was over 200kw, but 35% charge it had dropped to 114kw

IMG_0524.jpeg


By the time it had reached 85% it had fallen to under 50kw.

Temperature 21c, quite a nice day.

Is this decay in charge power normal, a site issue or a car issue? I doubt the latter as a number of others were complaining about the slow charge rate.

Still 40 mins gave me time to get a coffee and chat with other owners.. and the power was free!
 

DJP31

Active Member
Aug 30, 2015
1,691
1,096
UK
As others have said perfectly normal. Think of your battery as a big jug. When it's near to empty you can turn the tap pretty much full on. As the jug fills the flow of water needs to be slowed down, as you can't spill a drop.

If this is going to be your first winter with a Tesla, you'll also find the charge rate isn't as quick as you'd expect as the battery pack will be cold. Even with preconditoning you'll be hard pressed to get the same rate as during the summer.
 
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Mr_Dave

Guest
Imagine you have 100 sponges and want to put them in a box that’s only big enough for 30. So the first 30 sponges just slot in the box easily and really quickly, but take up all the space. The only way to get more in is to start compressing the sponges already in the box as well as squashing the ones your adding. This takes longer and is harder so uses energy just to do it. Once you’ve 80 sponges in the box, they’re really well squashed so it takes a lot more energy to keep squeezing them in until eventually all 100 sponges are squashed tightly in the box.
 

Limey

Member
Sep 30, 2020
152
162
England
It's normal but Teslas drop off from peak chasing speed very quickly past 25%. Some of the Germans can hold it past 50%.

Tesla have some work to do here
 

Yev000

Active Member
May 3, 2019
1,368
966
Knaphill
It's normal but Teslas drop off from peak chasing speed very quickly past 25%. Some of the Germans can hold it past 50%.

Tesla have some work to do here
Germans have more in reserve and sell their cars at a loss. They are also a lot less efficient. End result you are spending just as long on a charger....


Basically only E-Tron GT is 15 min faster than Teslas - in Norway (with a lot of non-Tesla charging locations).... And that's before testing the new S.
 

Limey

Member
Sep 30, 2020
152
162
England
Germans have more in reserve and sell their cars at a loss. They are also a lot less efficient. End result you are spending just as long on a charger....

I'm talking about peak charging speed over time, not about car Totally effeciency and if the manufacturer is selling for a loss.

Tesla can do better, that's all.
 

Peter 224

Member
May 9, 2021
456
299
Salisbury
Thanks everyone, my wife "got" the sponge analogy immediately!!
Still on a learning curve.
So at 7kw the rate of charge must be virtually constant, and slow.
 

Adopado

Active Member
Aug 19, 2019
4,533
3,422
Scotland
Thanks everyone, my wife "got" the sponge analogy immediately!!
Still on a learning curve.
So at 7kw the rate of charge must be virtually constant, and slow.
Indeed it is but if you have cause to charge to 100% even that speed will drop for the final percent top off.
 

LukeUK

Member
Feb 25, 2020
426
261
Shropshire, UK
So at 7kw the rate of charge must be virtually constant, and slow.
About 28 mph equivalent, as long as you're not sat in the car with the A/C going, etc. Quite different to the ~1000 mph achievable with a flat battery at a super charger.

As above, it does drop towards the end if you do charge to 100%, but that shouldn't be too often.
 

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