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
What I'm trying to say is just that different battery chemistries behave differently. Some don't mind being stored at 0 volts while this instantly destroys others. Some have low self discharge, others high. Some need to be hot, others like to be cool, and so on. They are simply different. Even different versions of a single chemistry can behave very differently, Altairnano being one example.
As an EV owner you really want to keep your particular variant happy, so reading the manual is a must
This sounds like one of those, What If I want to drive to my great gramma's house?" questions. The answers are as easy as "rent a car" or Have someone check on your car.
I mean, if an EV owner is in a horrible accident and is in a coma for a year maybe they have a dead EV in the garage. Meanwhile they might have lost the house, wife and job. Stuff happens. Electric cars are not perfect, just more perfect than gasoline cars.
Last edited by vfx; 02-29-2012 at 10:18 AM.
The world loves to be deceived.
The trade-off is that Tesla uses a battery type with greater energy density by both weight and price, but the "cost" is that it requires more care, and therefore more power, than other battery types (some of which weren't even available when the Roadster was designed). With LiFePO4 the Roadster pack would have needed less care, and could have been designed to endure years (?) without being plugged in. But the car would have cost more and had less range. Trade-offs.
The relatively shorter safe no-plug time is the "price" of getting the most range and keeping the cost down.
BTW and FWIW, I took a long vacation, left the car plugged in in Storage mode, and IIRC the pack was at about 20% when I returned home. This was plenty to do some shopping immediately, and the next morning the pack was at a "full" Standard charge. (I had no reason to charge it immediately, so let it wait for its usual midnight start time.
A related question: How much money do you want to spend to reduce the likelihood of an event which is already extremely unlikely? If a different design would have enabled to car to sit unplugged for a year but would have raised its price by $10,000, would it be worth it to protect the car against the event that you are in a coma for two months AND your circuit-breaker trips AND you have nobody checking messages who can deal with the car when Tesla tries to notify you? I think it's a case of dreaming up extremely unlikely scenarios to justify adding a possibly expensive additional fail-safe. The guy who started all this simply neglected to plug in his car. The lesson for the rest of us: Plug in your car.
But, OTOH, if a simple software update can extend the safe unplugged time without making a different fail route more likely, then I'm all for it.
Last edited by dsm363; 02-29-2012 at 10:31 AM.
Or have a 700 mile range or charge in 2 minutes or carry a sheet of plywood build a guestroom or stockpile for the coming apocalypse ?A related question: How much money do you want to spend to reduce the likelihood of an event which is already extremely unlikely? If a different design would have enabled to car to sit unplugged for a year but would have raised its price by $10,000, would it be worth it
The world loves to be deceived.
I just see this as an issue of relative risk. There appears to be a tiny risk of bricking it if I'm stupid enough, but I get withdrawal after just a couple of days if I haven't driven it, so the idea I'd neglect it for months on end is preposterous. I'm not remotely afraid of this happening.
A far more likely scenario is my Roadster gets written off by a lamp post or driven into by some idiot. Now that's a risk I spend effort worrying about. Next issue please.
Speaking of which - that is a real scenario - a wrecked car sitting in a salvage or repair lot with the battery/pack heading toward oblivion.
Hopefully someone (Tesla themselves?) is able to go rescue packs of otherwise disabled cars. Lets say for instance that the charge port got damaged in an accident.
Neglect and/or forgetting is one thing, but what about those rare situations where you are unable to charge even if you wanted to?
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