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Battery disconnect with dual battery and trickle charger

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ceengland7(at)gmail.com
Guest

Posted: Sat Jan 26, 2019 6:00 am Post subject: Battery disconnect with dual battery and trickle charger

On Sat, Jan 26, 2019 at 5:54 AM whodja <whodja(at)gmail.com> wrote:



[quote] 



 Iâ€™m almost finished with my RV-10 build and Iâ€™d like use my trickle

 charger

 for both batteries on the ground. Iâ€™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

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

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

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