Will the Tesla batteries exhibit the dreaded "battery memory effect" if the owner puts in short charges?
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Will the Tesla batteries exhibit the dreaded "battery memory effect" if the owner puts in short charges?
Anything wrong with living in the 70 - 90% zone? I've heard that the big killers from Li-Ion are time at 100% SOC and number of deep discharge cycles. I am trying to figure out whether to live in the 30-50% range most of the time and take it higher when needed or just keep in the 70 - 90% range.
I wouldn't say that's a good idea for long term life. It's just if you are the type to stress over the stated range of your battery, it'll ease your concerns by showing higher numbers.No, but it is a good idea to periodically (every few hundred miles) charge the car fully (90% "standard" charge is fine) and then let the car sit for at least an hour before driving to allow the pack to balance.
An out of balance pack will degrade faster than a balanced one as the out of balance cells will be charged higher and/or discharged lower than the rest resulting in faster degradation of those cells which further limits the pack capacity. You can only charge and discharge to the level of the weakest cells.I wouldn't say that's a good idea for long term life. It's just if you are the type to stress over the stated range of your battery, it'll ease your concerns by showing higher numbers.
Anything wrong with living in the 70 - 90% zone? I've heard that the big killers from Li-Ion are time at 100% SOC and number of deep discharge cycles. I am trying to figure out whether to live in the 30-50% range most of the time and take it higher when needed or just keep in the 70 - 90% range.
I don't think the damage from regularly charging all cells to 90% is less than leaving it out of balance at 50% or so. Yes, the out of balance cells will be stressed slightly more, but it's still at relatively low SOC (so not overly stressed).An out of balance pack will degrade faster than a balanced one as the out of balance cells will be charged higher and/or discharged lower than the rest resulting in faster degradation of those cells which further limits the pack capacity. You can only charge and discharge to the level of the weakest cells.
An out of balance pack will degrade faster than a balanced one
These two statements seem to be in conflict. Can someone speak to whether (and under what conditions) balancing will happen at 50% SOC?I don't think it is in dispute that closest to 50% is ideal.
These two statements seem to be in conflict. Can someone speak to whether (and under what conditions) balancing will happen at 50% SOC?
Exactly. This is a better expression of my basic question. I drive ~30 - 60 miles/day most days. I've been standard charging at night. So my battery lives in the 75 - 90 zone. Trying to calculate whether I charge to 50% on weekdays and 90% on weekends (more driving on weekends) is better or worse overall for the battery condition.
I agree /w this. But this is only for OCD nerds who want to mess w/ their charge settings every day. If you drive your car every day leave it at 90% and just drive it. If you're going to store it for days/weeks/months put it at 50%. If you want to minimize time at 90% just set your charge timer to start charging later so it finishes closer to when you plan to leave.Yes, 50% on weekdays and 90% on weekends is better for the pack than keeping it at 90%. You'll have a lower average SOC but still have a chance to balance on weekends.
On the Roadster it was 80% and above. I would bet that the Model S is similar.Yes. I've been building confidence towards scheduling a 3AM charge start time. That would cover me and reduce the hours at 90%.
I would still like more information on balancing. Does that only happen at 90% or above?
Related: So if I go on vacation and the car sits for two weeks, what's the ideal percentage?