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deej(at)deej.net
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 Posted: Mon Jul 14, 2014 7:10 am Post subject: Battery choice |
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On 05/22/2014 09:18 PM, Dj Merrill wrote:
| Quote: | $44 including shipping from Amazon for the UB12220 battery, 12v 22Ah in
the same form factor.
A plus is that it is 9 lbs lighter than the 25 Ah battery it will be
replacing (a B and C model BC110-1).
Bob,
I will report back to the list as to how it performs. I have a low
compression 150hp Lycoming O-320 with a light weight starter, so it
should hopefully turn it over with no difficulty.
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Finally got the plane back together yesterday from the panel upgrade,
and am reporting back to the list with the results. I installed one of
these as the main battery:
http://www.amazon.com/gp/product/B001G8FY38/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1
and one of these as the aux battery:
http://www.amazon.com/gp/product/B004J2TAZQ/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1
I was only able to do taxi testing yesterday due to weather, however,
the UB12220 battery turned the engine over just as fast as the previous
B&C battery, so no issues with cranking power (in summer at least).
I'll let you know more as I test further.
On a somewhat related note, do contactors normally get very hot when in
use? After running the engine and taxiing around for 15-20 mins
yesterday, I stuck my hand back behind the baggage area to feel the
battery and listen to see if I could hear it "boiling" (it was not hot
or boiling). I happened to touch the contactor, and it was very hot,
almost to the point of burning my hand, but not quite. Hot enough so
that it was very uncomfortable keeping my hand on it for more than a few
seconds. Is this is normal?
Thanks,
-Dj
--
Dj Merrill - N1JOV - VP EAA Chapter 87
Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/
Glastar Flyer N866RH - http://deej.net/glastar/
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nuckolls.bob(at)aeroelect
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| Posted: Mon Jul 14, 2014 8:19 am Post subject: Battery choice |
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On a somewhat related note, do contactors normally get very hot when in
use? After running the engine and taxiing around for 15-20 mins
yesterday, I stuck my hand back behind the baggage area to feel the
battery and listen to see if I could hear it "boiling" (it was not hot
or boiling). I happened to touch the contactor, and it was very hot,
almost to the point of burning my hand, but not quite. Hot enough so
that it was very uncomfortable keeping my hand on it for more than a few
seconds. Is this is normal?
Yes. "Hot" is a relative term. While the outside
surface of the contactor may become too warm to
keep your fingers on it, this condition is normal.
http://tinyurl.com/mpcgp3t
http://tinyurl.com/k6bwdqo
Internal components of the contactor
are rated for much higher levels.
An RG battery in distress doesn't 'gurgle' but
it does whistle. Finished some tests on a really
big RG battery a few months ago wherein a Schumacher
charger failed to perform as advertised . . .
the battery was 'singing' as pressures exceeded
settings on the vent valves.
Bob . . .
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deej(at)deej.net
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| Posted: Mon Jul 14, 2014 9:01 am Post subject: Battery choice |
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On 07/14/2014 12:18 PM, Robert L. Nuckolls, III wrote:
| Quote: | Yes. "Hot" is a relative term. While the outside
surface of the contactor may become too warm to
keep your fingers on it, this condition is normal.
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Excellent, thank you!
| Quote: | An RG battery in distress doesn't 'gurgle' but
it does whistle.
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I was listening for any sort of weird noise coming from the battery.
I've also had a Schumacher charger go wonky on me (it is sitting on my
bench right now), and from one RG battery I could clearly hear what
sounded like "boiling/bubbling", and from another the "hissing/singing"
as you describe. The voltage from the charger was getting up to 15.7 or
so. I haven't had the time to tear it apart to see if it can be
adjusted down. The other charger that seems to be working correctly
puts out 14.5 volts.
The UB12220 battery has a label on the top that says it can handle up to
14.7 volts, and my alternator is putting out 14.2, so I am hopeful this
battery will work fine in the plane. The essential bus diode is
dropping 0.6v across it, giving 13.6 v on the e-bus, which seems reasonable.
-Dj
--
Dj Merrill - N1JOV - VP EAA Chapter 87
Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/
Glastar Flyer N866RH - http://deej.net/glastar/
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nuckolls.bob(at)aeroelect
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| Posted: Mon Jul 14, 2014 11:31 am Post subject: Battery choice |
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The UB12220 battery has a label on the top that says it can handle up to
14.7 volts, and my alternator is putting out 14.2, so I am hopeful this
battery will work fine in the plane. The essential bus diode is
dropping 0.6v across it, giving 13.6 v on the e-bus, which seems reasonable.
-Dj
Some weeks ago, a Lister published a reply from Odyssey
in response to a query about his PC680 battery life.
The response spoke to the holy-watered manner in which
Odyssey batteries should be recharged . . . the letter
also stated that "no Schumacher chargers are approved".
I've been a follower of SOME Schumacher products for
a dozen years or more. In particular, I've owned a number
of 1562, 2A charger/maintainers. For the most part, every
1562 I've tested produced a recharge profile that mirrored
this plot. Well within the recommended profile suggested
by Hawker-Enersys.
http://tinyurl.com/pwo2oxv
I do have a 1562 charger around here that was
sent to me for testing . . . but it got 'swallowed
up' in a re-organization of my shop digs perpetrated
by a grandma/grand-daughter conspiracy . . .
the charter is not lost, I just don't know where it
is right now . . . the shop looks nice.
A few weeks ago I spoke to my disappointment for the
demonstrated performance of a new Schumacher XC75W
charger with lots of push buttons and a digital display.
Three successive recharge cycles of the same battery
produced these profiles . . .
[img]cid:.0[/img]
The first recharge was in the "AGM" mode, consistent with
the configuration of battery. As you can see, this profile peaked
at over 15.5 volts . . . The next time I tried the "STD"
mode with similar results. Finally a recharge cycle in the "GEL"
mode produced a perfectly acceptable performance . . .
I forwarded this data to Schumacher asking for an opportunity
to talk with an engineer . . . I have yet to hear from them.
From this experience I must conclude that any tendency
toward blind faith in Schumacher's ability to produce a
well crafted recharge profile is not well placed.
I was surprised that Odyssey put the evil eye on Schumacher
some years ago . . . they did the same thing to Battery
Minder. I would like to see the data upon which their
displeasure stands but the data above suggests that
Odyssey's displeasure may be standing on solid physics . . .
You spoke to an observed output of 14.2 volts . . . which
is in no way abusive to the battery. But the Rest Of the
Story speaks to the complete recharge profile as plotted
in the data cited above. I'm doing a study of both lithium
batteries and suitable chargers . . . watch this space.
I have no doubt that the 12220 battery will perform well
when knew. If it suffers any weakness, it will manifest
in poor service ilfe . . .
Bob . . .
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fly4grins(at)gmail.com
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| Posted: Fri Jul 18, 2014 1:26 pm Post subject: battery choice |
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| Quote: | ...I was only able to do taxi testing yesterday due to weather, however, >the UB12220 battery turned the engine over just as fast as the previous>B&C battery, so no issues with cranking power (in summer at least). >I'll let you know more as I test further.
|
FWIW, I installed a pair of those in my as yet unfinished -8. It seems my battery tender jr smoked them....
[quote][b]
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