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ceengland7(at)gmail.com Guest
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Posted: Sat Jan 26, 2019 6:00 am Post subject: Battery disconnect with dual battery and trickle charger |
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On Sat, Jan 26, 2019 at 5:54 AM whodja <whodja(at)gmail.com> wrote:
[quote]
I’m almost finished with my RV-10 build and I’d like use my trickle
charger
for both batteries on the ground. I’ve been maintaining both batteries
during the build with an Odyssey battery charger and both batteries wired
in
parallel.
My electrical system is designed with dual batteries, each having an
Independent system with separate battery contactors and a crossfeed relay
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ceengland7(at)gmail.com Guest
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Posted: Sat Jan 26, 2019 9:31 am Post subject: Battery disconnect with dual battery and trickle charger |
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On 1/26/2019 10:23 AM, Robert L. Nuckolls, III wrote:
Quote: | Quote: |
I bought a 'no name' SLA battery through ebay back in mid November for a Kolb project that won't fly until spring. I just checked its voltage, and it's still at 12.8V. How long do you plan for the plane to sit between flights? While some have had decent luck using 'maintainer' chargers on SLA batteries, many have seen greatly reduced lifespans when using maintainers. If the battery technology doesn't need it (extremely low self-discharge rate), why risk it? Odyssey's technical documents will show you the self-discharge rate for one of their healthy batteries. |
�If you have a demonstrated incident of
�death-by-maintainer, then the maintainer
�was (1) badly designed or (2) defective.
�An 'ideal' recharge/maintenance plot
�looks like this:
https://tinyurl.com/k6xr9mk
�Here's a measured performance on
�a Schumacher XC75 charger on a
�100AH truck battery
https://tinyurl.com/k6xr9mk
�Here's a plot on a Schumacher WM1562A
�on a 20AH SLVA
https://tinyurl.com/mtqyhxb
�Here's a Battery Tender Jr. on a 7AH
�SVLA
https://tinyurl.com/b4td78b
�While some do not closely follow the
�'ideal' plots, they do achieve a top-off
�followed by a drop-and-hold to the
�maintenance level. I've been
�using various charger/maintainer
�products for decades on both vehicles
�and lab batteries with expected
�results: Some of my lab batteries are
�over ten years old and still deliver
�a substantial fraction of their
�name-plate capacity. I.e. still
�over 80%.
�I've yet to test any Harbor Freight
�maintainer that produces the necessary
�performance . . . doesn't mean that
�there are none . . . just that the
�two I tested went into the round-file
�and that was over 10 years ago.
�While it's true that well constructed
�SVLA batteries may not benefit greatly
�from the use of a maintainer, it's
�not a BAD thing to do either and
�in some cases a necessary thing to do.
�
� Bob . . . | Bob,
No disagreement that if everything is 'right', it'll be ok. But. The fact remains that quite a few a/c-application SLA users that have practiced maintainer continuous use,� report relatively short lived batteries. on the other hand, I don't recall ever hearing a report of short battery life from someone who *doesn't* have a maintainer in continuous service, even in planes that aren't regularly flown. My a/c fits the latter category; it often goes longer than a month without flying, and I've never had an issue with short battery life.
Given that SLAs can go many months with minimal self-discharge (begs the question of need), and the risk of unintentional use of an incorrect or defective charger, why go to the trouble?� Now if it's going to sit for a year...
Charlie
Virus-free. www.avast.com [url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2] [/url]
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