On 6 Jun 2016 at 8:57, John Lussmyer via EV wrote:

> Putting 300VDC at the fingertips of the driver and passengers?  Doesn't sound
> like a good idea. 

Aren't most all vehicle electrical items switched electronically these days? 
Everything seems to go through some computer.   

> Main pack dies - you can't turn on the emergency flashers.

The same thing happens if your current 12v house battery goes flat.

> 300VDC switches are MUCH more expensive and complex. 

Is it more expensive to design semiconductors to switch 10 amps at 12 volts, 
or 0.4 amps at 300 volts?  That's not a rhetorical question: I don't know.

> Accessories need to work over a large variation of voltage. (280-330 in
> my truck). 

You could regulate the accessory bus.That would provide the side benefit of 
allowing a range of nominal voltages for the traction battery while 
standardizing accessories at, say, 100 volts.

But if you're going to do that, I guess you might as well just "regulate" it 
down to the now-standard 12v.

David Roden - Akron, Ohio, USA
EVDL Administrator

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