Re: 42V Car Batteries

On Wed, 31 Oct 2007 14:12:59 -0700, the renowned Winfield Hill
<hill@xxxxxxxxxxx> wrote:

Al wrote:

A well worn engine takes less juice to start. I lived in Montana and a
fellow I knew had a Kaiser-Fraiser, an old beast of a car. The engine
was very loose and it was the only one which would start after an
overnight cold soak of -30 to -40F. It would go, blub, blub, blub and
slowly speed up. Once it was cranking, it was used to jump start some
other cars in the parking lot. The car batteries put out very little
juice at those temps.

I wonder how the new wonder-hybrids would do under those conditions?

The Prius has an interesting feature: After you turn it
off, there's a little whirring noise as a pump fills an
insulated tank with hot engine coolant. When you start
the car, and are running off the big NiMH battery, it
presumably transfers the saved warm water back to the
engine, to pre-warm the block. After a going a short
way, the engine starts and finishes warming up to be
ready for efficient use. I had good experience with it
at 10 below freezing, but don't know beyond that. When
it's cold, the control electronics keeps the battery
close to full charge, and is very parsimonious with the
battery, consequently the MPG performance drops badly.

NiMH battery capacity drops very quickly below room temperature.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@xxxxxxxxxxxx Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
.

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