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Charging Choice


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#31 ckent323

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Posted 13 September 2019 - 06:40 PM

I found the following information which may be of use relative to battery charging

https://batteryunive...ad_acid_battery

https://www.itacanet...ery/battery.pdf

https://www.impactba...my-car-battery/

https://www.powerstream.com/SLA.htm



Relative to Lifeline Batteries I found the following:

"The charging current during bulk charging should be set as high as practical; higher current levels mean faster recharge time and less time for the plates to become sulfated. Due to the low impedance design, Lifeline batteries can tolerate an inrush current as high as 5C (500 A for a 100 Ah battery)."

I do not believe this is unique to Lifeline batteries but it may only apply to high quality batteries - I don't really know.

Ref: http://lifelinebatte...ical-Manual.pdf


Note: internal resistance in a lead acid battery changes with SOC and temperature.

https://batteryunive...ect_performance

and

https://batteryunive...rnal_resistance

I hope this information is helpful.

Regards,

Craig

Edited by ckent323, 14 September 2019 - 08:22 PM.

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#32 radarcontact

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Posted 14 September 2019 - 02:28 PM

Sounds like this thread is winding down, as Alan did some rewiring and improved his charging.  Just wanted to throw in my recent experience w/charging, in case anyone else is considering charging alternatives.

 

I recently replaced my original Surepower 1314A separator with a Blue Sea 7611 ACR.  When the separator was in place I would notice, after camping at night and driving the next day, that it would take a long time to bring the batteries up to full charge when the engine was running.  I have a hefty solar panel bank on my Hawk roof (320W), so charging the camper batteries is not usually a big concern for me, but the slowness of charging when driving, on a cloudy day, bugged me.  I attributed this to the separator not connecting when camper batteries were in the mid 12V or lower range.  Anyway, I thought the 7611 ACR would be a simple and inexpensive experiment.   I left all my original camper wiring the same, i.e., 10 AWG.  Since replacing the separator w/the ACR I've noticed a significant improvement in charging.  If, for example, I wake up one morning after camping and my batteries are, say, 82-85% capacity, which is typical for my usage, and my battery voltage is around 12.4-12.5, I can start my engine and the amperage going into the batteries is usually over 10A initially, according to my battery monitor (I've seen it as high as 15-16A).  It will gradually drop off as the batteries become fully charged.  Happens much faster than with the separator.  After driving for an hour or two everything is 100%, and my camper batteries are in float mode.

 

So, just swapping the separator with the ACR and making no other changes did improve things for me.  Plus, I now can keep my engine battery topped off w/solar, since the ACR joins the two battery banks and acts as one.   Of course, having heavier gauge wire would improve charging even more, but at this point I don't really feel I need it.  


Edited by radarcontact, 14 September 2019 - 02:33 PM.

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#33 So Cal Adventurer

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Posted 28 September 2019 - 12:43 PM

Excellent Info here!  I am getting ready to upgrade all of my wiring as well!

 

Thanks


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