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Old 08-16-2014, 10:28 PM   #11
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Quote:
Originally Posted by gbaglo View Post
Any idea how I could go from full charge to 12.02 in 24 hours, other than that the battery is deceased?
Actually, that is a good indicator of a near-dead battery. It will also charge rapidly to full voltage. Of course you aren't actually storing much energy, just moving the tiny remaining bit of un-sulphated lead back out of solution onto the plates. Or in other words, you have a 1 Amp hour battery in a 90 Amp hour case.

I'm betting you were coming to that conclusion.

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Old 08-16-2014, 10:35 PM   #12
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I use this 5 amp "battery Tender" for my 6 volt battery bank.

Battery Tender 12v 5 Amp Power Tender Plus Charger PT12v022-0157 Large View
Same here, seems to work well.
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Old 08-16-2014, 11:57 PM   #13
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Are two different volt meters in use? Was the first reading taken with one volt meter at the terminals and the second with a different meter at an outlet?

A reading of 12.76 is hard to reconcile with your first reading.

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Old 08-17-2014, 12:58 AM   #14
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Both readings were from a 12V outlet in the trailer. I left the trailer unplugged from shore power and I'll take another reading tomorrow morning ( make that mourning ).
I'm also going to check cells with my new hydrometer and will report.
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Old 08-17-2014, 07:58 AM   #15
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Originally Posted by hotfishtacos View Post
I use this 5 amp "battery Tender" for my 6 volt battery bank.

Battery Tender 12v 5 Amp Power Tender Plus Charger PT12v022-0157 Large View
The key is to get the battery desulphated and then KEEP it desulphated. While the Battery Tender (TM) is a "smart" trickle charger, it DOES NOT have the capability to desulphate.
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Old 08-17-2014, 08:30 AM   #16
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Interesting article on this topic: Sulfation and How to Prevent it - Battery University
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Old 08-17-2014, 10:44 AM   #17
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Boondocker Main Board Assembly for WFCO 8955
Very easy install !
For a remote charger:
http://www.bestconverter.com/12-volt...der_p_139.html
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Old 08-17-2014, 12:29 PM   #18
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Originally Posted by gbaglo View Post
Both readings were from a 12V outlet in the trailer.
I've never found 12V outlets to be all that reliable. The first reading could have been a poor connection. I've had to "wiggle and jiggle" (tech term) sometimes to get a good connection.

An inexpensive multi-meter measuring from the battery terminals probably gives a more consistently accurate measurement of the battery voltage.

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Old 08-17-2014, 12:40 PM   #19
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Interesting article on this topic: Sulfation and How to Prevent it - Battery University
Good read. Looks like you have to start with a healthy battery.
Have to dig out my multi-meter and the manual.
Cheap voltmeter is reading 12.60 from DC outlet this morning.
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Old 08-17-2014, 04:55 PM   #20
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Tested cells this afternoon. Hydrometer read 12.75 or better on all cells (probably more like 12.71 if adjusted for temperature ). Electrolyte is clear.
Beats me.
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