“It’S A Brick” – Tesla Motors’ Devastating Design Problem Don't let that battery go flat - the broken window fallacy?
Posted 25 February 2012 - 09:13 AM
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Posted 25 February 2012 - 10:15 AM
When there is an electric car with LiPo (Lithium Polymer) batteries, or something with the same charge capacity, that also has a backup petrol generator I'll lay out my money, but not yet.
I'd like 250-350 miles on a charge with the backup generator to rescue me if I travel to the Outer Hebrides and run out of charging points.
It will come, all electric cars people buy today will have computer like depreciation over the next 5 years, by 2017-20 the technology will be 'done', but its not there yet except for city dwellers with charging points in every borough.
You're basically saying you'll never buy an electric car.
An electric car with 250 mile range doesn't need a range extender.
An electric car with a range extender doesn't need a 250 mile range.
It's like asking for a car that's left hand drive and also right hand drive (for driving on the continent). It's possible to make but It'll never be built.
So what are going to buy?
A Tesla Model S ( http://www.teslamotors.com/models)
Or a Chevy Volt / Vauxhall Ampera? (http://www.vauxhall-ampera.co.uk/ )
This post has been edited by gadget: 25 February 2012 - 10:16 AM
Posted 25 February 2012 - 10:41 AM
Modern R/C cars have being using lithium batteries for the last 4 years or so. Speed controllers used in them have been designed in such a way that when the battery is getting towards the minimum voltage all power is cut. Tesla should have this built in, no excuse really and an obvious design oversight.
Posted 25 February 2012 - 10:46 AM
Even allowing a 10 year life for the battery (I think I'm being kind), that's still £4K per year to replace.
Exactly, R/C lipo batteries are generally guaranteed for a 1000 cycles or so, some fail long before that, some can be cycled more.
Posted 25 February 2012 - 10:57 AM
It does sound an alarm - weeks before IIRC, when it gets down to the few days left stage it actually contacts Tesla
The story is just nonsense from Clarkson-loving goons with no mind of their own.
Posted 25 February 2012 - 10:59 AM
That homes of the future thing showed that mad dad who unplugged the bloke so he almost didn't get to work
Posted 25 February 2012 - 11:03 AM
Tell that to anyone with a pacemaker
What you are saying is that your OH can't read a manual, and this unfortunate trait is compounded by having no understanding of how different battery technologies work.
Posted 25 February 2012 - 11:07 AM
The battery holds its charge for months when not being used, and alerts the owner and Tesla when charge gets low. Clever car!
Tesla stated the issue in their warranty, in the same way an ICE manufacturer insists on regular services, oil changes etc, etc, etc,...
This problem is not an issue with the high volume cars like the Nissan Leaf (see below)
Not convinced. If Nissan can sort it out, so can Tesla. Seems to be an analagous problem to a design flaw in a regular motor which could leave you with a big bill, eg VW water pump bearings can disintegrate which throws off cambelt and ruins engine on their 20 valve 1.8 from the late nineties, or BMW's Nikasil problems with high sulphur fuel in the 90s.
The instances may be rare, but it is the sort of flaw that ought to have been ironed out. I'm not sure you need to go into the eleccy/fossil fuel debate- it's just a question of design.
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Andrew Charalambous said:
Posted 25 February 2012 - 11:08 AM
I can see that it is a pretty rare event when the car is charged, but I can easily imagine rushing home to go on holiday, parking up, then clearing off for 2 weeks, only to find a dead car when I got home.
Looks simple enough to fix - a firmware upgrade in the battery management system should fix it.
Posted 25 February 2012 - 11:11 AM
1) This problem could (and should) have been engineered away
2) You have to be pretty stupid to get your Tesla into this situation. Along the lines of droping your ICE car into neutral, revving it to 16,000 rpm and then complaining when the engine blows up.
Posted 25 February 2012 - 11:34 AM
Posted 25 February 2012 - 11:42 AM
Inductive roads been considered:
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Posted 25 February 2012 - 02:58 PM
By the sounds of things, the battery pack has an extremely complex active management system that is designed to keep the battery in optimal condition. So, it constantly monitors for weak cells, and presumably will draw power from the pack as a whole to top-up weak or undercharged cells. There may also be small heaters in the pack, to ensure that the batteries don't freeze (causing damage) or offer inadequate performance at low temperatures.
The mistake seems to have been using such a system which might be quite an energy hog, and not considering the issue that people may not always be able to act upon low battery warnings - people go on holiday, get ill, etc.