I'm new to this and your discussion has me totally confused. What is
the verdict? Sep 12v Battery for accessories or not??
Sent from my iPhone
> On 06 Jun 2016, at 8:51 PM, Lee Hart via EV <ev@lists.evdl.org> wrote:
>
> John Lussmyer wrote:
>> Putting 300VDC at the fingertips of the driver and passengers?
>
> Note that normal 240vac has a peak of around 340v.
>
> High-power accessories like heaters, air conditioners, power steering pumps,
> etc. could run directly from the 300vdc. They would be hard wired, so
> consumers wouldn't have access to the power leads for these.
>
> Accessory outlets for charging things like your cellphone would still be
> 12vdc. It would be provided by an isolated DC/DC converter.
>
> I'd also expect that there would be an inverter to produce isolated 120vac,
> so all sorts of things consumers are used to plugging in would now work in
> the car.
>
>> Main pack dies - you can't turn on the emergency flashers.
>
> A backup system would be a good idea. But you don't need a 60 lbs battery to
> supply it.
>
>> 300VDC switches are MUCH more expensive and complex.
>
> Not really. They are likely to be solid state switches, which are smaller and
> cheaper than low-voltage-high-current switches.
>
>> Accessories need to work over a large variation of voltage. (280-330 in my
>> truck).
>
> That's less than +/-10% range. Normal AC appliances already have to operate
> with +/-10% variations in their supply.
>
> I'm not saying there are NO problems. It's just that the problems are
> different, and probably easier to handle with HV than LV.
>
> --
> "IC chip performance doubles every 18 months." -- Moore's law
> "The speed of software halves every 18 months." -- Gates' law
> --
> Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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