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botsapper 02-22-2012 01:17 PM

Costly bricking of Tesla?
 
EV owners have to be completely aware of severe battery failure could destroy any resale value of those cars. The reputation of any EV brand could at risk with the general car buying public. Any completely discharged Tesla would be difficult to recharged/restarted and even to be pushed/towed along the street, requiring flatbed towing. Battery depletion has to be a constant concern for any Tesla owner/future buyer.
Unplugged or even insufficient current in recharging can deplete the battery charge and essentially destroy it. Teslas are always 'on', with parasitic maintenance subsystems continually working. Tesla warns that it takes 10-11 weeks of inactivity to completely discharge its batteries. Without replenishing them, will totally disable the vehicle. Long airport parking or defective/accidentally pulled extension cords in their garages are typical scenarios, creating disastrous results. When a Tesla battery does totally discharge, it cannot be recharged and would have to be replaced. Replacement costs are estimated to be 40K!!! Reports of disabled Roadsters are kept quiet but these unfortunate Tesla owners are claiming that Tesla warranties does not offer financial relief and requires them to pay for brand new batteries. Overseas Teslas are having these problems because of voltage incompatibility and are being returned. Typical auto insurance does not cover or even offer additional policies to cover this potential failure. Tesla does have a $12K battery replacement plan but interestingly it does not cover accidentally discharged batteries! Pay up, then you can get it back on the road.
Everyone with Teslas (Roadsters, for now) have to fundamentally understand that you have vehicles that could be rendered useless w/ discharges and there is NO way of monetary protection when it happens.
the understatement

rmay635703 02-22-2012 01:20 PM

If my suburban sits for over 2 weeks without being started the battery is fully discharged and normally needs replacement, perhaps tesla needs an e breaker for when the car sits so it can sit a little longer.

UFO 02-22-2012 02:01 PM

I'm surprised there is not a lockout on further discharge below a certain level, above the level where the battery cannot be recharged. That's how I would design it, and yes, I am an electrical engineer who has designed batteries, chargers, switching supplies and analog data acquisition systems.

oil pan 4 02-22-2012 02:11 PM

Quote:

Originally Posted by rmay635703 (Post 288507)
If my suburban sits for over 2 weeks without being started the battery is fully discharged and normally needs replacement, perhaps tesla needs an e breaker for when the car sits so it can sit a little longer.

My car had that problem, if it would sit more than 3 months the battery would discharge. When converted to the back seat LiFePO4 battery I installed a battery disconnect switch from painless wiring, $50, well worth it to protect a $300 battery.
Last time I went to afghanistan before the LiFePO4 conversion it was a huge problem to get the women to reconnect the - battery cable, and then they didn't unhook it after the car was moved. I get back, battery was dead.

botsapper 02-22-2012 04:21 PM

Quote:

Originally Posted by UFO (Post 288512)
I'm surprised there is not a lockout on further discharge below a certain level, above the level where the battery cannot be recharged. That's how I would design it, and yes, I am an electrical engineer who has designed batteries, chargers, switching supplies and analog data acquisition systems.

UFO, how about designing an aftermarket limit/threshold alarm to send e-notifications to Tesla, your phone and your mother messages to remind you, GET SOME ELECTRICITY!

Daox 02-22-2012 04:33 PM

Quote:

Originally Posted by botsapper (Post 288534)
UFO, how about designing an aftermarket limit/threshold alarm to send e-notifications to Tesla, your phone and your mother messages to remind you, GET SOME ELECTRICITY!

Tesla actually already offers that. It will send info to your phone telling you to charge it because its too low.

Daox 02-22-2012 05:01 PM

Here is some more info, a bit more level headed at that...

Tesla Battery 'Bricking': The Real Story Behind The Scare

botsapper 02-22-2012 05:05 PM

Quote:

Originally Posted by Daox (Post 288537)
Tesla actually already offers that. It will send info to your phone telling you to charge it because its too low.

How about sending a technician to your garage/location and put the plug back in?
Seriously, some multiple-supercar and occasional EV owners could use this type of concierge service.

Ryland 02-22-2012 11:35 PM

a constant 30 watt draw seems a little steep and that is what it would take to discharge the 56kw battery pack over 11 weeks, but still it should be part of ANY battery BMS to cut power if the voltage drops to low, that is a big part of the point of having a battery management system (BMS) so to allow that 30 watt draw to stay on all the time is odd... have a "power up" lag time if the car has sat for weeks without being charged! my electric car's controller draws 50 watts for a few seconds every few minutes and that is it to keep the controller powered up and ready to go on the spot, sitting over winter is not an issue and that is with a much smaller battery pack.

markweatherill 02-23-2012 01:17 AM

I don't know how the battery sizes compare, but the Tesla Roadster has a better range than the Nissan Leaf. Perhaps that is (partly) because the Tesla appears to allow more of the battery capacity to be used? I wonder if that really does affect battery longevity. (I also wonder what the range of a Leaf would be if it was hacked to allow greater discharge than 20%)


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