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'[OT]: transient specs -- jump starts'
2002\01\16@144810 by Barry Gershenfeld

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>>Lyle Killough wrote

>> For automotive systems, devices must be designed to withstand 24V for at
>> least 5 minutes.   Apparently, a 24V battery is used to jump 12V cars in
>> some instances.  Does anyone know if 48V is used to jump 24V systems?

>Huh ? Imho you can jump a car with 24V only once (the last time). The same
>is true with 24V probably. In my experience the strength of surges
>increases with the square of the supply voltage. This is caused by
>stronger inductive consumers being used on the higher voltage systems.
>
>Peter

I wonder about this, too.  Recent* rumours have it that jump starting
one vehicle with another will kill one or both of their alternator
diodes or other electronic thingies...  Those who have heard this
avoid ever giving jumpstarts.  When I do it, I leave the engine
off and use the battery only, if that's enough to do it.  When
I'm on the receiving end I'll try disconnecting first before
starting...if I can...  I know I'm OK but I don't want to
damage the other vehicle.

I'm not so sure that this has to do with transients.  It might be
more like one vehicle's regulator trying to match the other
or something.   What do you all know about this?

Considering the above, the suggestion of connecting 24V for
a while startled me a bit.  :)

Barry

[*] My cars are 40+ years old and use generators.  So
   "recent" has an unusual meaning here...

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