| Re: [GMCnet] Battery charging confusion [message #105043] |
Thu, 04 November 2010 11:38 |
rallymaster
Messages: 662
Registered: February 2004
Location: North Plains, ORYGUN
Karma: -4
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Senior Member |
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Ken, it doesn't matter that your car battery never gets a really complete
charge.
It gets charged everytime you run the engine, and you're not trying to
get the absolute best daily use (down to 50%, at least) out of it.
That's Bob's reason for following Trojan's charge recommendation.
RonC
On Thu, 04 Nov 2010 01:27:19 -0500 Ken Burton <n9cv@comcast.net> writes:
>
>
> jayrabe wrote on Wed, 03 November 2010 18:08
> > Thanks Ken,
> >
> > OTOH Handy Bob was pretty unequivocal that 14.8 for an hour or two
> before floating was the only way to get a battery 100.00% charged, &
> he quotes batt mfr specs to support that. Is he mistaken or just
> radically over-reacting?
> >
> > J
> > 76 PB
> > Portland, OR
>
> 14.8 will get you charged sooner, but not any more completely. I
> personally would not do it because of the risk of boiling and
> destroying the batteries.
>
> Some expensive charge controllers have a temperature probe that sits
> in the battery to tell to the charger to down shift when things get
> too warm. Your final charge to finish off the battery will be
> around 13.8 no matter what the initial charge rate was.
>
> Float or maintenance more is another thing and it is around 13.2
> volts.
>
> If Bob was correct then every car and truck running around would be
> under charged. Every automotive alternator system I know of runs
> 13.8 to 14.2. Most of those that run up to 14.2 sense the
> alternator temperature and throttle down to 13.8 when it get warm.
> This reduces the charge rate and tops off the battery without over
> charging it.
>
> In another application I have several small battery packs that have
> thermistors implanted in them. The thermistors tell the matching
> smart charger when they are being over charged. Once the thermistor
> trips the charger throttles down and stays there until the pack is
> removed from the charger and is reconnected again. This arrangement
> allow much higher initial charging rates and shortens the normal
> slow 12 hour charge rate on a completely depleted battery to about
> 2.0 hours. It works.
>
> If you had similar smart charging technology built into your battery
> and a smart charger to interpret it, then you could go to 14.8 or
> higher on your GMC batteries. Without it I suggest you stay in the
> 13.8 to 14.2 volt range and float them to 13.2 when they are fully
> charged.
>
>
>
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
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Ron & Linda Clark
1978 Eleganza II
North Plains, ORYGUN
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Ron & Linda Clark
North Plains, ORYGUN
78 Eleganza II
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