Larry said,
> "I will trust my little 4 AMP hour backup battery"
Ah ha ha ha ha ha ho ho ho ho ho hee hee hee.
4 Ah?
What can anyone do with 4 amp hours I ask you? That's not enough amp
hours to even make a small puddle. The World, nay, the Universe Itself
cannot help but burst its seams with mirth upon hearing such a claim. 4
amp hours isn't enough reserve to even wave a weary arm in distress. 4
Ah isn't enough to even flash the flasher, if you've already done it that
day. Help needs to be on the way forthwith as 4 amp hours can sustain
but moments and the end shan't be tidy. I would ought avert mine eyes
and alert the authorities should success depend upon so little.
Instead, look upon this little fellow. 7 3/4" across the front
5" front to
back
8" high
SPECIFICATIONS
55 Ah Capacity
380 CCA at 0 degrees F
570 CA at 32 degrees F
725 CA at 68 degrees F
Length: 7.72" (196mm)
Width: 5.05" (129mm)
Height: 8.93" (227mm) - Over Terminals
Chemistry: Sealed AGM/VRLA
1 Year Free Replacement Warranty
***************
Sorry Larry. For an avionics back-up I'm sure that little thing is fine,
although for the same purpose as you use yours I use one with 20 Ah.
Your set-up is more elegant than mine and as it turns out I don't think I
even need an avionics back-up if I would just re-design my back-up
system. OR . . . keep my current system but have it wired and switched
in such a way that I could turn it on as a supplement to the primary
system. When I put it in I wasn't clever enough to mess around with
diodes and so just to keep things simple I made it a completely separate
system but in the long run I've discovered that's not true anymore. I've
somehow gotten them intermingled. Not good.
Having my back-up system available to supplement my primary system would
be an excellent solution, especially since I use such a substantial
battery for my back-up power source. But I'm realizing I don't need a
back-up system for fuel pump and avionics, at least not as I originally
concieved it.
It will be fun once I get this Cavalier project finished and delivered
(within a week or so I'm thinking) to take a fresh look at my electrical
systems on the KR and start having some fun learning and applying some
new ideas.
I guess all these little things Lithium this and lithium that will work
IF they're fully charged and IF there's no glitches in the start sequence
or other unknown or unexpected drain on the system you are counting on
when the chips are down. Draw these little batteries down just a little
and you've got nothing left though. Then they're just cute little
useless gizmos. They have no reserve. These motorcycle-sized batteries
are good for two or three attempts, if that, and then you're done for the
day. You're either going to start propping or call a cab.
My failing 32 Ah battery that would barely turn the prop that night in
Merced, eventually did turn the prop once I turned my beacon and radio
and everything else off that might have been on. These light little
loads normally don't make any difference and I have gotten sloppy . . .
but that night getting them turned off and waiting just a little longer
for the battery to build up some strength, was enough - just barely
enough - to get the engine running. I really wasn't wanting to get out
and tie the tail down in the dark and start propping the engine and
running around in the dark to catch the throttle. I could have done it
and would have, reluctantly - but thanks to the fact I had an eight-year
old 25 lb. AGM battery with sufficient reserve capacity (even though
wounded), the engine caught and I was saved.
This new AGM from Japan weighs 28 lbs. I wouldn't care if it weighed 38
lbs - the plane doesn't notice the weight. I can't imagine it affects my
take off distance or climb rate in the slightest whether it weighs 28
lbs., 8 lbs. or 38 lbs.
These batteries with large reserve capacities are a true instance of
turning lead into gold, especially in the dead of night in the middle of
nowhere. Add cold temperatures into the mix and the case for having a
really good battery grows even stronger.
A light weight battery is kind of cute I suppose. But what good is it?
Mike
KSEE
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