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Battery disconnect with dual battery and trickle charger

 
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ceengland7(at)gmail.com
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PostPosted: Sat Jan 26, 2019 6:00 am    Post subject: Battery disconnect with dual battery and trickle charger Reply with quote

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
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PostPosted: Sat Jan 26, 2019 9:31 am    Post subject: Battery disconnect with dual battery and trickle charger Reply with quote

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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