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1. 05:28 PM - Re: Ni-Cad? (John Loram)
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Well Said! -john-
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Wednesday, July 30, 2014 8:15 AM
Subject: Re: AeroElectric-List: Ni-Cad?
..
People who understood batteries published reams of data
on how to get the best performance from Ni-Cads . . . data
which said "constant current charge" . . . but those-
who-know-more-about-airplanes-than-we-do decided that it
would be too much to expect an air-framer to install
ni-cad friendly starter-generator controllers. They decreed
that thermometers be added to ni-cads with displays
on the panel along with warning lights for battery overheat.
Instead of crafting a battery management system totally
transparent to the pilots . . . the pilots were burdened
with rudimentary system management duties to offset
poor regulatory judgement.
Hence, the ni-cad gets this bad rap for being higher
risk . . . risks driven by inelegant design. As a chemical
energy storage system, ni-cads have a lot going for them.
But as we've discussed here on the List . . . there is
no such creature as an alternative chemistry, drop-in
lead-acid replacement. THERE ARE DIFFERENCES that
beg understanding and deference in design, fabrication,
installation, operation and maintenance.
Whether lead-acid, ni-cad or lithium-ion . . . failure
to pay homage to the physics gods is at best just
expensive . . . at worst it sets airplanes on fire.
Every technology comes with its own constellation of
challenges.
http://tinyurl.com/kxu3s6j
Bob . . .
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