nuckollsr(at)cox.net
Guest
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 Posted: Tue Jan 02, 2007 9:10 am Post subject: Back-Up Battery ground (The multi-word answer) |
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At 11:51 AM 1/2/2007 -0500, you wrote:
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<echristley(at)nc.rr.com>
Robert L. Nuckolls, III wrote:
>
> In other words, if this battery has real value as a backup
> energy source, does this not speak poorly of any efforts
> to make the additional battery unnecessary in the first place?
>
> Bob . . .
Not necessarily. With an electrically dependant, auto-conversion engine
you have ignition, control computers and fuel pumps which must all be fed
a healthy diet of electrons at somewhere around 15A. Even with the
'backup' battery, it would not be possible to burn through all the usable
fuel on board in case of an alternator failure. A 20Ah unit would be
marginal at best. The extra battery capacity in this case carries very
real benefits.
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Not the point. This is a 4.5 a.h. "backup" battery installed
in lieu of dead-lead as ballast. The question before us is
to ascribe value in having "ballast" assume lifetime requirements
for maintenance. This assumes the rest of the electrical system is
already blessed with load analysis, failure mode effects analysis and
preventative maintenance to insure that all other battery(ies)
will meet their intended purposes as sources of energy to back
up an alternator failure.
In other words, what is the return on investment for "useful"
ballast as opposed to "dead-lead."
Bob . . .
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< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
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