Uneven Water Loss in Batteries - Page 2 - SailNet Community
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post #11 of 22 Old 11-01-2013
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Re: Uneven Water Loss in Batteries

You can not assume that new batteries are good. And your charger could be faulty and overcharging. Or as mentioned before, you have something constantly drain that battery. You said you have two 12v batts in series? 24V system?

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post #12 of 22 Old 11-01-2013
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Re: Uneven Water Loss in Batteries



Procedure here for testing http://www.batteryequaliser.com/prod...aintenance.htm

Eric
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post #13 of 22 Old 11-01-2013 Thread Starter
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Re: Uneven Water Loss in Batteries

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Originally Posted by Delta-T View Post
You can not assume that new batteries are good. And your charger could be faulty and overcharging. Or as mentioned before, you have something constantly drain that battery. You said you have two 12v batts in series? 24V system?
The house bank is 2x Group 27 in PARALLEL.

There are actually 2 banks. The starting ban is a single Group 27. Then theres the house bank. Everything is a 12v.

Could it be the uneven size of the banks?

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post #14 of 22 Old 11-01-2013
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Re: Uneven Water Loss in Batteries

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Parallel is no good. Will not charge or discharge evenly. No matter how you have the wire connected.
Please give us the details & scientific dissertation on this claim. Please keep in mind that there are millions of batteries out there wired in parallel, it is one method of building capacity. This is done not only in marine applications but in industry, fire and EMS service vehicles, uninterrupted power supply systems, cordless power tools, solar, military etc. etc. on and on. Even some of the large truck makers have moved away from 4D and 8D's for engine starting and are now wiring TPPL AGM batteries, often group 31's in parallel. I have some parallel banks out there at 13 years of age still performing well. I also own the equipment to test batteries via internal resistance and well wired parallel banks survive and charge perfectly fine. If they are "single end wired" I do see imbalance issues and my test equipment shows me this is possible. When end to end wired I don't see imbalance issues any more so that with 6V batteries... I generally prefer 6V or 2V batteries but even with 6V you will need to wire series parallel to gain Ah capacity. I have some vesels I work on with banks in excess of 1200Ah. You don't get there on a boat, with the space constraints, without using parallel wiring..

Sure it would be nice if we all used 2V cells in series but they are huge, expensive and tough to fit. They represent about 2% of the banks I see on boats. When you jump up to 6V you lose many of the benefits you'd gain by using 2V cells. No longer can you measure individual cell voltages as you can with a 2V bank because the individual cells are not accessible for voltage measurements..


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You need to add a combiner for even charging, but will not help with uneven discharge... MASTERVOLT Battery Mate IG 1602, 2 Battery Isolator at West Marine

Simpler to have two 6v batts in series to make the 12V and have added amps. No charging or discharging issues.
That is not a combiner it is an isolator. Again please explain for us scientifically why you "need" a combiner to charge evenly.


I suspect the OP simply got a bad battery, it happens. Another possibility is these are private labeled "battery distributor" batteries where they slap labels on anything that comes through the door. I had a customer two years ago with identical labeled/stickered batteries yet the batteries were completely different brands and not even a similar case.. Differnt brands use water at differnt rates. Also the battery losing water could be the battery closest to the engine and running at a higher temp. I have even seen batteries get heated by dark colored topsides when the sun comes up. The SG should be checked to confirm there is not a cell going bad...

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Last edited by Maine Sail; 11-01-2013 at 10:02 PM.
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post #15 of 22 Old 11-02-2013 Thread Starter
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Re: Uneven Water Loss in Batteries

@Maine Sail - thanks for the voice of expert here. The battery thats losing water *IS* the battery nearer to the engine.

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post #16 of 22 Old 11-02-2013
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Re: Uneven Water Loss in Batteries

I agree with Maine. Parallel works well in installations on boats as in industry. I have installed 12 volt batteries in parallel as well as 6 volt batteries in series/parallel without issues for years, in banks as large as 1000 AH. As long as the bank is drawn from evenly there have not been any problems. As Maine stated it is the only affordable way to create a large bank.

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post #17 of 22 Old 11-02-2013
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Re: Uneven Water Loss in Batteries

I take back what I said, all I am finding is that Paralleling batt is fine. Sorry for the misinformation.

Back to the issue....I did find some thing that might help and I did not know. "If there is a .05 or more difference in the specific gravity reading
between the highest and lowest cell, you have a weak or dead cell(s). If you
are really lucky, applying an EQUALIZING charge may correct this condition."

"RECOMMENDED that you use a
temperature compensated hydrometer, which can be purchased, at an auto parts
store"

"Most of the "defective" batteries that are returned to the manufacturer during
free placement warranty periods are good. This suggests that most sellers
of new batteries do not know how or take the time to properly load test or
recharge batteries."

"Another major cause of premature battery failure is sulfation. When batteries are stored discharged or stored fully charged for over three months without being recharged"

EQUALIZING charge will fix this. This info came from this great site... DEEP CYCLE BATTERY FAQ

Eric
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post #18 of 22 Old 11-02-2013
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Re: Uneven Water Loss in Batteries

Series-parallel has many decades of successful performance in telephone systems and diesel-electric submarines, in electric fork trucks, and many other applications. If you follow good practice for wiring and good practice for maintenance and charging they will last a long time.

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post #19 of 22 Old 11-02-2013
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Re: Uneven Water Loss in Batteries

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Series-parallel has many decades of successful performance in telephone systems and diesel-electric submarines, in electric fork trucks, and many other applications. If you follow good practice for wiring and good practice for maintenance and charging they will last a long time.
Yep..

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post #20 of 22 Old 11-02-2013
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Re: Uneven Water Loss in Batteries

And one more for the books...
A damaged battery cable will carry less electrical energy than a battery cable in good repair. A battery cable can become damaged by mechanical stresses or corrosion. It is important, therefore, to periodically replace battery cables that are installed in an environment where there is vibration, movement, or corrosive chemicals. An ohmmeter or a digital multimeter may be used to test a suspected bad battery cable. If the ohmmeter measures a high degree of resistance in the cable, the cable should be replaced.

Sorry no scientific data to back that up.

Eric
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