Tesla Motors downplays risk of bricking a Roadster
Last night a blog post by blogger Michael DeGusta (reposted by Jalopnik) went into great detail explaining how several Tesla Roadsters were made into inoperable bricks after sitting idle for a few weeks. He even has an unnamed Tesla service manager as proof, so the story must be true, right? The Internet being what it is these days, Twitter is full of links to various news articles and posts weighing in on the story.
To start with some basic facts, all cars will have problems develop if they sit idle. In a gasoline car the various fluids can seize the engine, at which point the engine replacement cost is expensive. Batteries, in particular, run down, and can run down to where it would damage the battery. Are we to be surprised that an electric car, if left idle for awhile, would not see a problem develop?
By the way "Brick" is technoslang for a previously operable device that's now inoperable. An example usage is "I jailbroke my iPhone and now it's bricked".
According to DeGusta, a Tesla Roadster that's simply parked and left unplugged will still drain the battery pack below a zero state of charge, at which point the battery pack is destroyed. Further, the Tesla warranty will not, according to DeGusta, cover this situation, and battery pack replacement costs upwards of $40,000. The issue is certain subsystems in the car are always "on" even if the car itself is "off," not unlike various gizmos in your house that still draw power from the wall even if the gizmo is turned off. If the Tesla Roadster is not plugged in, the power to run these always-on subsystems comes from the battery pack and, according to DeGusta, there is no protection built into the Roadster to prevent the battery pack from running all the way down and getting damaged. Supposedly this has happened to at least five Tesla Roadster owners, according to the unnamed Tesla service manager who DeGusta consulted with for the story. He also tells us that Tesla began remote monitoring of all Roadsters, and in at least one instance saw a Roadster whose battery state-of-charge was dangerously low, and being unable to contact the owner of that Roadster, turned on its GPS locator and dispatched a service team to plug the car in.
Tesla Motors, for their part, released this statement:
All automobiles require some level of owner care. For example, combustion vehicles require regular oil changes or the engine will be destroyed. Electric vehicles should be plugged in and charging when not in use for maximum performance. All batteries are subject to damage if the charge is kept at zero for long periods of time. However, Tesla avoids this problem in virtually all instances with numerous counter-measures. Tesla batteries can remain unplugged for weeks (even months), without reaching zero state of charge. Owners of Roadster 2.0 and all subsequent Tesla products can request that their vehicle alert Tesla if SOC falls to a low level. All Tesla vehicles emit various visual and audible warnings if the battery pack falls below 5 percent SOC. Tesla provides extensive maintenance recommendations as part of the customer experience.
In other words, Tesla has confirmed it's possible for the battery pack to get damaged, but that they've designed in several safeguards.
If the problem afflicts Tesla Roadsters, then what about other electric cars? Nissan issued this statement concerning the Nissan Leaf: