Today's Message Index:
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1. 06:47 PM - Re: Marine deep cycle battery charging question (Robert L. Nuckolls, III)
2. 07:01 PM - Re: Marine deep cycle battery charging question (Earl)
Message 1
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| Subject: | Re: Marine deep cycle battery charging question |
At 18:47 2014-12-24, you wrote:
>
>Hello listers,
>
>I have four 12volt RV/Marine deep cycle batteries that I need to
>trickle charge over the winter. Can I just connect them in parallel
>and use a trickle charger ?
'Trickle charge' is an archaic term that accuratly describes
it's philosophy. Put the battery in a tiny but perpetual charge
mode . . . where 'trickle' used be a rate around 1 amp for honk'n
truck and car WET cells. Such treatment on a modern RG battery
is detrimental.
The ideal charge and maintenance profile for a rechargeable
battery looks like this . . .
http://aeroelectric.com/Pictures/Curves/Charger_Performance/Ide
Charge at some reasonable current until the 'absorption' voltage
appropriate to the chmistry is reached and hold there for some
top-off time. Note that the recharge current during absorption
charging is constantly declining as the battery tops off. When
current falls to less than 5% of initial absorption rate, then
drop the charging voltage to just above the normal, open circuit
voltage for the battery.
Absorption voltage for SVLA is on the order of 15.0 volts, OC voltage
is just under 13.0 volts. So to keep the battery's internal leakage
from discharing the battery, SUPPORT it at just above delivery
voltage . . . hence the only think leakage can do is load the
charger to a few mililamps and the charter is incapable of damaging
the battery.
That de-sulfation thingy as a prophy7lactic or recovery process for
SVLA batteries has been hyped for decades I have yet to see a
double-blind study that demonstrates is efficacy. See.
http://batteryuniversity.com/learn/article/sulfation_and_how_to_prevent_it
I've had as many as a half dozen batteries of various sizes
attached to a single Battery Minder (circa before 'de-sulfating'
fads bubbled up). These were my laboratory portable power batteries
some of which held as-new capacity for as long as a decade.
The Shumacher 1562, 1.5A chartger/maintainer is an excellent
product in this class of device and sells for about $20 at
Wal-Mart. Having the de-sulfation feature doesn't hurt but
it dosen't help either. Don't pay extra for it.
Bob . . .
Message 2
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| Subject: | Re: Marine deep cycle battery charging question |
Bob is sticking to this story..
=46rom Earl, Retired fm GE, Sport Pilot now
> On Dec 26, 2014, at 8:45 PM, Robert L. Nuckolls, III <nuckolls.bob@aeroele
ctric.com> wrote:
>
> At 18:47 2014-12-24, you wrote:
>>
>> Hello listers,
>>
>> I have four 12volt RV/Marine deep cycle batteries that I need to trickle c
harge over the winter. Can I just connect them in parallel and use a trickl
e charger ?
>
>
> 'Trickle charge' is an archaic term that accuratly describes
> it's philosophy. Put the battery in a tiny but perpetual charge
> mode . . . where 'trickle' used be a rate around 1 amp for honk'n
> truck and car WET cells. Such treatment on a modern RG battery
> is detrimental.
>
> The ideal charge and maintenance profile for a rechargeable
> battery looks like this . . .
>
>
>
> Charge at some reasonable current until the 'absorption' voltage
> appropriate to the chmistry is reached and hold there for some
> top-off time. Note that the recharge current during absorption
> charging is constantly declining as the battery tops off. When
> current falls to less than 5% of initial absorption rate, then
> drop the charging voltage to just above the normal, open circuit
> voltage for the battery.
>
> Absorption voltage for SVLA is on the order of 15.0 volts, OC voltage
> is just under 13.0 volts. So to keep the battery's internal leakage
> from discharing the battery, SUPPORT it at just above delivery
> voltage . . . hence the only think leakage can do is load the
> charger to a few mililamps and the charter is incapable of damaging
> the battery.
>
> That de-sulfation thingy as a prophy7lactic or recovery process for
> SVLA batteries has been hyped for decades I have yet to see a
> double-blind study that demonstrates is efficacy. See.
>
> http://batteryuniversity.com/learn/article/sulfation_and_how_to_prevent_it
>
> I've had as many as a half dozen batteries of various sizes
> attached to a single Battery Minder (circa before 'de-sulfating'
> fads bubbled up). These were my laboratory portable power batteries
> some of which held as-new capacity for as long as a decade.
>
> The Shumacher 1562, 1.5A chartger/maintainer is an excellent
> product in this class of device and sells for about $20 at
> Wal-Mart. Having the de-sulfation feature doesn't hurt but
> it dosen't help either. Don't pay extra for it.
>
>
> Bob . . .
>
>
>
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