Charging hint by Tesla: ...use scheduled charging to start charge 3 hours after end of drive

[TMThree]

After abusing the heck out of a model S and needing battery replacement in the eHawk, Tesla found the battery died due to constant supercharging from low SoC to high SoC. They gave several hints to making the battery last longer (stuff we all know, such as don't go to 100% all the time). But this one caught my eye since I haven't heard about it before:

"We also recommend that the customer use scheduled charging to start charge 3 hours after end of drive at low SOC."
​

What's the point of this? To let the battery cool? I was under the impression that you want to limit time spent at either extreme of SoC.

Also note that while the recommendation appears to be talking about supercharging hints, there is no scheduled start for supercharge usage.

 

[Xevex]

Just curious, how much does it cost you to replace the battery?

 

[Cyclone]

constant supercharging from low SoC to high SoC

"We also recommend that the customer use scheduled charging to start charge 3 hours after end of drive at low SOC."

That will be quite the idle fee charge! Lol

 

[gaswalla]

I've seen this before - seems like the idea is that temperature is worse that a low state of charge. So, charging up after the battery cools down is ideal. What's odd is that the latest software update actually heats up the battery en route to a supercharger to maximize supercharge rate of charge.

 

[TMThree]

I've seen this before - seems like the idea is that temperature is worse that a low state of charge. So, charging up after the battery cools down is ideal. What's odd is that the latest software update actually heats up the battery en route to a supercharger to maximize supercharge rate of charge.

Does it do that only for cold temps, or even in hot?

 

[TMThree]

Just curious, how much does it cost you to replace the battery?

Everyone should still have battery coverage right now (unless you're a model 3 with >120k miles or original roadster). Musk said it would be 5-7k for a pack replacement. Model 3 has 4 packs.

It sounds like Musk expects battery costs to be cut in half in the next few years, so by the time Model 3 owners are even starting to think about battery replacements, maybe their cost will be trivial.

 

[Big Earl]

Everyone should still have battery coverage right now (unless you're a model 3 with >120k miles or original roadster). Musk said it would be 5-7k for a pack replacement. Model 3 has 4 packs.

It sounds like Musk expects battery costs to be cut in half in the next few years, so by the time Model 3 owners are even starting to think about battery replacements, maybe their cost will be trivial.

Model 3 has one pack that contains four modules.

 

[TMThree]

Yeah, wrong word nomenclature.


this is Musk's tweet:

Model 3 drive unit & body is designed like a commercial truck for a million mile life. Current battery modules should last 300k to 500k miles (1500 cycles). Replacing modules (not pack) will only cost $5k to $7k.

 

[ngogas]

Don’t worry about your battery. Stop babying it. Charge away.

 

[Jedi2155]

My pack has lost 3% in 6 months (10,000 miles) so more than I'd like but not horrible. Supercharging isn't good though....

 

[Zoomit]

My pack has lost 3% in 6 months (10,000 miles) so more than I'd like but not horrible. Supercharging isn't good though....

Good news!—that 3% is a known bug. It’ll come back. Here’s my 10,000 mi battery. See when the bug hit?

 

[Jedi2155]

Good news!—that 3% is a known bug. It’ll come back. Here’s my 10,000 mi battery. See when the bug hit?

View attachment 404212

I hope it's a bug but it could also be a more accurate measurement of our pack capacity. We'll know in time....

 

[ewoodrick]

First, was this a random Tesla employee or official correspondence?

Yes, this would be to let the battery cool after a long drive,. Low SOC is probably more like 20% in this case.

Sitting at extremes for long times isn't great, but that's months, not hours.

But I believe that in your case, the recommendation is to stay away from Supercharging, especially from the extremes

 

[TMThree]

I hope it's a bug but it could also be a more accurate measurement of our pack capacity. We'll know in time....

View attachment 404213

No, it's a bug. My car had about 600 miles on it when the new firmware decided to make my car go from 325 range to 316.

 

[TMThree]

 

[AmpedRealtor]

Yeah, wrong word nomenclature.


this is Musk's tweet:

Model 3 drive unit & body is designed like a commercial truck for a million mile life. Current battery modules should last 300k to 500k miles (1500 cycles). Replacing modules (not pack) will only cost $5k to $7k.

So replace the pack will cost $20k-$28k on a car that costs about $45k. That's ridiculous!

 

[TMThree]

So replace the pack will cost $20k-$28k on a car that costs about $45k. That's ridiculous!

Well, remember its not just the battery module, you have the labor too.

And keep in mind all modules are unlikely to be needing to be replaced.

Also odds are low that you'd want to keep the car longer than the battery is able to function. I've never had a car at 300-500k miles, have you?

 

[Zoomit]

So replace the pack will cost $20k-$28k on a car that costs about $45k. That's ridiculous!

The correct interpretation of the tweet was that replacing all four modules would be $5-7k.

 

[CSFTN]

After abusing the heck out of a model S and needing battery replacement in the eHawk, Tesla found the battery died due to constant supercharging from low SoC to high SoC. They gave several hints to making the battery last longer (stuff we all know, such as don't go to 100% all the time). But this one caught my eye since I haven't heard about it before:

"We also recommend that the customer use scheduled charging to start charge 3 hours after end of drive at low SOC."
​

What's the point of this? To let the battery cool? I was under the impression that you want to limit time spent at either extreme of SoC.

Also note that while the recommendation appears to be talking about supercharging hints, there is no scheduled start for supercharge usage.

No. Limit the time spent SITTING full (or very hot), limit the time spent CHARGING at low temperature (<50ºF IIRC).

 

[AMPd]

Yeah, wrong word nomenclature.


this is Musk's tweet:

Model 3 drive unit & body is designed like a commercial truck for a million mile life. Current battery modules should last 300k to 500k miles (1500 cycles). Replacing modules (not pack) will only cost $5k to $7k.

So to replace a pack would cost between 20-28k?
By the time the pack needs replacing, it wouldn’t even be worth replacing it.