Is 'Bricking' going to be a problem?

2130 Views 4 Replies 4 Participants Last post by kabalah70, Mar 1, 2012

Shane

Discussion Starter · Feb 22, 2012

Check out this article on Jalopnik... Is the battery technology in the Karma the same as Tesla?

http://jalopnik.com/5887265/tesla-motors-devastating-design-problem

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ct-fiskerbuzz

· #2 · Feb 22, 2012

This is also covered in this thread. Here's what I wrote there:

Speed-sensitive steering assistance is provided by an electrohydraulic system that runs on the car’s 12-volt system. This low-voltage system powers the on-board accessories, lighting, and infotainment system, and stores power in a conventional lead-acid battery. The roof of the Karma has solar panels that feed the system with up to 120 watts of power on sunny days. While this electricity never powers the wheels directly, it can reduce the amount of low-voltage power pulled from the high-voltage system, and could, in theory, add up to 200 miles of additional range per year. Cool, yes, but it’s mostly there to make a statement, we suspect.

Click to expand...

source

Basically, everything that does "power drain while off" is run off this separate, conventional-car system. The li-ion batteries are free to sustain themselves for long periods with no draw at all.

Note that if you're at 15% SOC ("0 miles" of range) and you leave the car sitting for six months in extreme (e.g., very much below freezing, or very much above 100-ish F / 40-ish C) temperatures, you still run some risk of killing the batteries. Leaving it for a month should be fine though. Unlike the Roadster, there should be no "parasitic drain" on the li-ion batteries.

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magnus

· #3 · Feb 22, 2012

Jalopnik is garbage. They also seem to have some type of personal grudge against electric/hybrid vehicles.

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kabalah70

· #4 · Feb 22, 2012

This is also discussed elsewhere in the forum where I gave a link discussing the different chemistry and LiFePO is much less susceptible to self-discharge than the Li-Nickel chemistry in the standard Li-ion batteries used by Tesla. As for the Model S/X I am not worried because they come with 8-year warranties.

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kabalah70

· #5 · Mar 1, 2012

New article about Teslas and bricking:

http://green.autoblog.com/2012/02/24/tesla-model-s-and-x-can-be-parked-for-a-year-without-bricking/

considering that LiFePO is less suceptible, it really should not be an issue for the Karma.

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