If this thread has taught us anything is that you must read and abide by the rules set out in your manual...From the Ferrari 458 Owner's Manual:http://jalopnik.com/5893895/the-ten-...als/gallery/11
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I own an EV and know that I must keep it charged
I own an EV but it wasn't made clear to me that I must keep it from being discharged
I don't own an EV but knew that you had to keep the battery from going flat
I don't own an EV and didn't know that you needed to keep them charged
Ferrari 458 Manual
If this thread has taught us anything is that you must read and abide by the rules set out in your manual...From the Ferrari 458 Owner's Manual:http://jalopnik.com/5893895/the-ten-...als/gallery/11
ok I must leave the car charged. But what should be the SOC percentage? 80%? 90%? or 100%?Originally Posted by Lloyd
I'd use 80% SOC.
Doesn't matter too much as long as it never goes to 0%.
The healthiest for the batteries is around 50%. 100% will put strain on the batteries. But 0% is deadly.
If you are storing a Tesla, Tesla recommends using the storage mode for the roadster (which charge to around 50% and keeps doing so as needed). I believe the recommendation for the Model S will be to us the standard charge mode. Note, I have not seen the owners manual yet, so that is just a guess at this point.
EVs should not only be charged when parked for hours or days, but also plugged in. It may be acceptable to leave your model S unplugged at the airport for 2-3 weeks, but be sure you make it back on schedule. If you were to be detained overseas, someone will need to rescue your car. Better to leave it plugged in and take a cab to the airport.
80% SOC is good if you plan to drive the car, but 50% SOC would be better for long term storage (weeks or months). Tesla offers "standard mode" charging and "storage mode," with SOC levels pre-set by Tesla engineers.
GSP
I agree. If you're gone on a really long trip it may be cheaper and faster to take a cab anyway than pay $10-20/day long term parking. Tesla has said the Model S can sit for a year at 50% SOC but I'd just do a full standard charge before heading to the airport assuming I'd have enough to cover sitting there unplugged and to make it back.
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Depends a lot on the specific EV. For example, if you leave your LEAF plugged in for 2 or more weeks, it's quite likely that you'll come back to a dead 12v battery unless you start with a low charge and set up a charge timer so that the car charges at least 30 minutes. Apparently there's an oversight in the firmware which keeps the HV battery from charging the 12v battery sufficiently in that situation. No thermal management system - so no need to leave it plugged in to keep the battery conditioned, either.
I thought that the S would tolerate months without being plugged in without issue as long as it had a decent charge to start with?
Having a "vacation mode" for most EVs would really seem to make sense where one could program the car to maintain a low SOC - calendar life of lithium batteries can be extended significantly by storing at low SOC instead of high SOC. Kind of makes me wonder why on a car like the S with a huge battery why they might not have a 50% "regular" charge level for daily use or something else besides standard/range modes. I imagine that for typical use one is probably only going to use 10% of the total capacity. Maybe the benefit isn't all that big compared to storage at 80% or whatever the regular charge stops at - but the data I've seen typically indicates at least a 25% improvement in calendar life - I imagine that many people would use it if given the opportunity.
I chose 80% for a number of reasons if the car will be left unplugged. 80% is low enough that extended time at that SOC will not impact the battery much, and over time the SOC will drop. It also provides enough energy for the pack to power temperature control for a while if needed when not plugged in, ( or if plugged in but power is lost). Since the S will go into a sleep mode when the pack SOC drops low enough it seems quite safe to leave the vehicle for extended periods not plugged in, I think Tesla says up to a year now, so you could get away with leaving it at an even lower SOC, but at some point you'll be without temperature management. If you're in a climate where that is not a concern then you don't have to worry about it.
Not sure if this has been posted on TMC so cross posting from the TM boards.
Rod and Barbara who took delivery of their Founders car a while ago have confirmed the Model S does not have a Storage mode, only Standard and Max. Link
Rod and Barbara | August 30, 2012
Butch asked on Aug 18 if the Model S has a Storage mode of charging like the Roadster. The Model S Guide for Owners and the touch screen only have two charging levels: Standard (85% of battery capacity) and Max Range (100% of battery capacity). We checked with the Tesla Ownership Experience team and they confirmed there is no Storage mode. If the Model S is to be left unattended for a prolonged time period it is supposed to connected and charged in Standard mode.
If I was letting my roadster sit for a week or more without any use I'd leave the SOC at 50%, hook to the charger and let it sit in storage mode. In storage mode the car wakes up once a day to check the SOC. I forget the SOC that storage mode keeps the care in, 20-30%?... (it may take your starting SOC and divide that by half, so if we started at 50% it will wait until 25% to charge) but it will kick on if it need to add a charge plus it its hot the roadster can handle the hot days better plugged (with its thermal management system) than unplugged.
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