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a.s.elliott(at)cox.net
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 Posted: Mon Jun 06, 2016 6:37 am Post subject: 24V replacement batteries? |
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I have a Concorde RG-24-15 battery in my IFR EAB aircraft. It is an SLA-AGM type battery. It was installed in 2012, and has been living in Arizona for the past 16 months. It is installed in the cabin, but experience has shown that batteries don’t last too long out here, where hangar temps go over 120°F on a regular basis. 3-year replacement cycles are reasonable, and new from AS&S it is $549.
Does anyone know of any appropriate service, perhaps non-aviation-specific, lower cost 24V batteries out there that could reasonably replace it? I have a little additional space to work with, so equal-size or smaller would be good! (It is approx. 5.95x7.11x7.15”.)
Andy
------------------------
Andy Elliott, N127VE, GP-4
CL: 480-695-9568
“If things seem under control, you’re just not going fast enough.” - Mario Andretti
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jmjones2000(at)mindspring
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| Posted: Mon Jun 06, 2016 9:18 am Post subject: 24V replacement batteries? |
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Andy,
Why not connect 2 Oddesey AGM batteries in series to obtain the 24v you are looking for? They are around $120-$130 each. The dimensions can be found online but they are small batteries. You could also bend up a new battery box or boxes.
Justin
On Jun 6, 2016, at 06:34, Andy Elliott <a.s.elliott(at)cox.net (a.s.elliott(at)cox.net)> wrote:
| Quote: | <![endif]--> <![endif]-->
I have a Concorde RG-24-15 battery in my IFR EAB aircraft. It is an SLA-AGM type battery. It was installed in 2012, and has been living in Arizona for the past 16 months. It is installed in the cabin, but experience has shown that batteries don’t last too long out here, where hangar temps go over 120°F on a regular basis. 3-year replacement cycles are reasonable, and new from AS&S it is $549.
Does anyone know of any appropriate service, perhaps non-aviation-specific, lower cost 24V batteries out there that could reasonably replace it? I have a little additional space to work with, so equal-size or smaller would be good! (It is approx. 5.95x7.11x7.15”.)
Andy
------------------------
Andy Elliott, N127VE, GP-4
CL: 480-695-9568
“If things seem under control, you’re just not going fast enough.” - Mario Andretti
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nuckolls.bob(at)aeroelect
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| Posted: Tue Jun 07, 2016 5:11 am Post subject: 24V replacement batteries? |
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At 12:16 PM 6/6/2016, you wrote:
| Quote: | Andy,
Why not connect 2 Oddesey AGM batteries in series to obtain the 24v you are looking for? They are around $120-$130 each. The dimensions can be found online but they are small batteries. You could also bend up a new battery box or boxes. |
AGM batteries do not need 'boxes' . . . they will
not leak even if you drive a nail into them and
pull it out. Just strap them down with materials
that equal or exceed the legacy 10g crash retention
design goal. That means for 15 pounds of SVLA battery,
you need 150 pounds of tear-out resistance. Here's
a dual, 12v battery installation that most likely
meets that goal. Set the batteries in a shallow
tray and strap them down.
[img]cid:.0[/img]
Bob . . .
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ceengland7(at)gmail.com
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| Posted: Tue Jun 07, 2016 11:04 am Post subject: 24V replacement batteries? |
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-------- Original message --------
From: "Robert L. Nuckolls, III"
Date:06/07/2016 9:04 AM (GMT-05:00)
To: aeroelectric-list(at)matronics.com
Subject: Re: AeroElectric-List: 24V replacement batteries?
AGM batteries do not need 'boxes' . . . they will
not leak even if you drive a nail into them and
pull it out.
Heads-up; not universally true. Commonly available agm quit starting my rv4 after about a year of use. Pulled top cowl & found a pinhole in side of case, & acid stain on the firewall 'shelf'. Obvious acid trail from pinhole. Furtunately, it didn't eat through the stainless firewall.
I still use open hold downs like the pic, but a rubber 'tray liner' now seems advisable.
Charlie
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nuckolls.bob(at)aeroelect
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| Posted: Wed Jun 08, 2016 3:48 pm Post subject: 24V replacement batteries? |
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| Quote: |
Heads-up; not universally true. Commonly available agm quit starting my rv4 after about a year of use. Pulled top cowl & found a pinhole in side of case, & acid stain on the firewall 'shelf'. Obvious acid trail from pinhole. Furtunately, it didn't eat through the stainless firewall.
I still use open hold downs like the pic, but a rubber 'tray liner' now seems advisable.
Charlie |
Interesting. What kind of battery was this? Was there
a 'goose egg' under the pin hole? I'm mystified as
to how this might happen. The AGM is valve regulated
to vent at 1-2 psi so that any swelling of the case
is associated with expanding plates material in their
death throes. I've not heard of a cell getting opened
to atmosphere on the sides without first suffering
gross chemical and electrical energy releases within
the cell. This has the smell of a manufacturing
defect.
Did you go back in with the same brand and part
number?
Bob . . .
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ceengland7(at)gmail.com
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| Posted: Wed Jun 08, 2016 6:14 pm Post subject: 24V replacement batteries? |
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On June 8, 2016 6:38:19 PM CDT, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:
| Quote: |
>Heads-up; not universally true. Commonly available agm quit starting
>my rv4 after about a year of use. Pulled top cowl & found a pinhole
>in side of case, & acid stain on the firewall 'shelf'. Obvious
>acid trail from pinhole. Furtunately, it didn't eat through the
>stainless firewall.
>
>I still use open hold downs like the pic, but a rubber 'tray liner'
>now seems advisable.
>
>Charlie
Interesting. What kind of battery was this? Was there
a 'goose egg' under the pin hole? I'm mystified as
to how this might happen. The AGM is valve regulated
to vent at 1-2 psi so that any swelling of the case
is associated with expanding plates material in their
death throes. I've not heard of a cell getting opened
to atmosphere on the sides without first suffering
gross chemical and electrical energy releases within
the cell. This has the smell of a manufacturing
defect.
Did you go back in with the same brand and part
number?
Bob . . .
Response was to the 'poke a hole; can't leak' statement. Hard to edit a quote on a phone/tablet screen keyboard. Pinhole likely happened in shipping. Worked for almost a year, but was slowly losing acid out the pinhole and on to the stainless firewall.
|
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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ceengland7(at)gmail.com
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| Posted: Thu Jun 09, 2016 9:25 am Post subject: 24V replacement batteries? |
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On June 8, 2016 6:38:19 PM CDT, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:
| Quote: |
>Heads-up; not universally true. Commonly available agm quit starting
>my rv4 after about a year of use. Pulled top cowl & found a pinhole
>in side of case, & acid stain on the firewall 'shelf'. Obvious
>acid trail from pinhole. Furtunately, it didn't eat through the
>stainless firewall.
>
>I still use open hold downs like the pic, but a rubber 'tray liner'
>now seems advisable.
>
>Charlie
Interesting. What kind of battery was this? Was there
a 'goose egg' under the pin hole? I'm mystified as
to how this might happen. The AGM is valve regulated
to vent at 1-2 psi so that any swelling of the case
is associated with expanding plates material in their
death throes. I've not heard of a cell getting opened
to atmosphere on the sides without first suffering
gross chemical and electrical energy releases within
the cell. This has the smell of a manufacturing
defect.
Did you go back in with the same brand and part
number?
Bob . . .
Don't know if this went through on the 1st attempt.
|
Response was to the 'poke a hole; can't leak' statement. Hard to edit a quote on a phone/tablet screen keyboard. Pinhole likely happened in shipping. Worked for almost a year, but was slowly losing acid out the pinhole and on to the stainless firewall.
Charlie
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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nuckolls.bob(at)aeroelect
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| Posted: Thu Jun 09, 2016 6:38 pm Post subject: 24V replacement batteries? |
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| Quote: |
Don't know if this went through on the 1st attempt.
Response was to the 'poke a hole; can't leak' statement. Hard to edit a quote on a phone/tablet screen keyboard. Pinhole likely happened in shipping. Worked for almost a year, but was slowly losing acid out the pinhole and on to the stainless firewall. |
that makes more sense. internal pressure excursions
. . .while small . . . are not zero. So it makes
sense that over time, such excursions could cause
small amounts of moisture to get loose on each cycle
and over time, the effects may well become observable.
Good data . . . thanks.
Bob . . .
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