Charge Question - Page 2 - Fiberglass RV


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Old 12-10-2014, 06:09 PM   #15
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Originally Posted by cpaharley2008 View Post
Casita Greg is correct in saying that 2 different 12v batteries in parallel will not charge 100% completely as the weaker battery will pull most of the load. Also when charging in parallel be sure and connect the charger to the negative on one and the positive on the other, do not just connect to the first battery and expect good results. See here http://www.gearseds.com/files/twobat_onechgr2.pdf

You found it on the internet so it must be true.
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Old 12-10-2014, 06:12 PM   #16
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Actually Byron, from experience, the internet just happens to agree with me.......
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Old 12-10-2014, 07:18 PM   #17
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Actually Byron, from experience, the internet just happens to agree with me.......
According to my electronic engineering degree my comments are real.
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Old 12-10-2014, 07:22 PM   #18
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So I guess it's experience vs education? Either way I'm trying to bolster or agree with the previous post not argue.
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Old 12-10-2014, 08:09 PM   #19
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So I guess it's experience vs education? Either way I'm trying to bolster or agree with the previous post not argue.
I guess I forgot to add my 50 years experience. So call me educated and experienced.
Now to check it out go look at 40' motor home. I know some have as many as 6 batteries. 2 for cranking and 4 for as house batteries. All charged from the same source, isolated but charged in a group of 2 (cranking) and a group of 4 (house). Look at police, fire, etc. repeater sites. Banks of batteries all charged from the same source at the same time.

I'm also an Amateur Radio Operator, and have worked on Ham repeater sites. Some with 8 to 10 12Volt batteries several different brands, sizes all connected in parallel with common load and charge source so drained and charged all at the same time.

I think I have a pretty good understanding and a lot of experience when it comes to electrical stuff.
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Old 12-10-2014, 08:16 PM   #20
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I don't think that anyone is questioning your experience, education, training, longevity, accolades, etc, etc, etc.
It's just the smug know-it-all cutting way you present your point, (and yourself,) that is most irritating. Obviously, no one knows as much as you do.
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Old 12-10-2014, 09:11 PM   #21
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Hmmmm, guess this 73 year old mechanic has been charging his batteries the wrong way for almost 60 years. The same way Byron mentions.
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Old 12-11-2014, 04:37 AM   #22
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Originally Posted by Casita Greg View Post
I don't think that anyone is questioning your experience, education, training, longevity, accolades, etc, etc, etc.
It's just the smug know-it-all cutting way you present your point, (and yourself,) that is most irritating. Obviously, no one knows as much as you do.
Greg, what you see as being smug is really frustration. I too am an EE. Most of the electrical topics discussed on this forum are first year, first semester; pretty basic fundamental stuff. After a while you get tired of arguing with internet experts that know all they know from reading " The 12 volt Side of Life" and " Handy Bob's Blog". I've pretty much given up. I applaud Byron for still trying to help out. Good engineers are very matter of fact and to the point. They tell you what they think. They make lousy politicians. Raz
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Old 12-11-2014, 05:57 AM   #23
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Good engineers are very matter of fact and to the point. They tell you what they think. They make lousy politicians. Raz
Good point Raz. My wife tells me I tend to be cryptic, giving short answers that can come across a little crass. Engineers tend to give short and concise answers.

One of the disadvantages of the Internet is the tendency towards short answers, a lacking of a human touch. We need to be very careful not to attack each other, be careful not to let anger overcome our good sense, and to look for the good in each other.

In life it is all to easy to remember the small negatives to the extent that the overwhelm the positive nature of life.

In this case the OP could charge both batteries in parallel from a single source and in relatively short order see the results for himself.
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Old 12-11-2014, 06:16 AM   #24
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Good reply Norm, this was starting to go sideways
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Old 12-17-2014, 06:48 AM   #25
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This thread reminds me of the thread about adding OMW's shock kits.
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Old 01-22-2015, 04:42 PM   #26
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You can only charge multiple batteries together that are exactly the same, right down to service cycle. If these two batteries weren't used together in the same bank from day one, You'll not get 100% capacity no matter what charger or trick you try. Charge one for a week, Clean the top case until you can't measure any voltage from each post to the area of plastic near the other post, and place on shelf at a cool room temperature. Charge the second one for a week, and do the same. In spring time measure each battery. If they drop anywhere near 12v throw them away.
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Old 02-01-2015, 06:23 PM   #27
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Charge Question

Not my opinion but Trojan Battery's: their wet cell battery's self discharge 1% per week at 42 degrees F, 2% per week at 75 degrees and 5% per week at 86 degrees F. Cleaning off the top is probably a good idea but they self discharge anyway.

You know your storage temp and can do the math.

If it were me I'd forget about the very low power (for its cost) battery tender and just recharge the batteries when they are layed up for winter, in January and when they are put back into service in the spring. Storage in an unheated garage would be perfect in most climates. Even a 50% discharged battery won't freeze above zero F. 15% discharged battery is good to 60 below.

It's really important to disconnect the battery from any possible load, unhook them from anything in the trailer. Tiny loads, like a battery meter or propane alarm, even a powered off battery charger can draw enough current to kill the battery over a long winter.

Trojan info here http://www.trojanbattery.com/pdf/WP_...orage_0512.pdf

Denny Wolfe
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