peter(at)sportingaero.com
Guest
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 Posted: Thu Feb 25, 2010 3:54 pm Post subject: GPU connection philosophy WAS: Re: GPU for Piper |
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Bob,
When I was in the military we sometimes had aircraft in the hangar on
ground power for many hours at a time as electrics or avionics snags
were investigated. Ground Power plugs were wired up to by-pass the
battery, and most times (always?) the battery connector was pulled.
Also, if the battery (24v Ni-Cad) was flat we took it down to the
battery bay and got another. We also used to start the aircraft every
time on external power (unless a power rig wasn't available).
Perhaps this thinking has found its way by osmosis into the small
aircraft TC community without any good reason? Perhaps its also an
attempt to stop owners charging old wet electrolyte batteries in situ,
with the risk of acid spillage, or worse?
Regards, Peter
Robert L. Nuckolls, III wrote:
| Quote: |
<nuckolls.bob(at)aeroelectric.com>
At 11:30 PM 2/24/2010, you wrote:
> Bob, Could you expand on the two philosophies or point me to a
> further discussion. I've been wrestling with both ways and each time
> I decide one way, I think about it some more and change my
> mind...again? Is either choice superior or is it six of one and half
> a dozen of the other?
If you hook ground power to the battery side of the
GP_Contactor, you can charge the battery without
powering up the aircraft. Further, you would not
be able to hook ground power to the aircraft WITHOUT
having the battery on line as well. This would be
my preferred configuration.
Production TC do it both ways but predominantly
the OTHER way. I'm mystified as to the rationale
for doing it the other way . . . somebody made
that decision long before my time and isn't around
to explain it any more. I'm unable to deduce
any advantage that would give it precedence over
the first way. I am presuming that they had a
"good" reason but I don't know what it is.
Bob . . .
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