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post #11 of 15 Old 10-15-2013 Thread Starter
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Re: Problem with new batteries keeping the charge

Hellosailor: Thanks for info. I have checked the date on the batteries and it was 07/2013, so hopefully they did not have enough time to sulfate while sitting around. Also, the voltmeter is newly installed and calibrated (or at least that is what I was told). However, I will check on the maker's numbers for the voltage to see which apply to these batteries. I have double checked that nothing is connected, except for the bilge pump which is direct wired. However, I empty the bilge manually before leaving and check when I come back to see if there is any water to know whether it had a chance to cycle and thus draw anything on the battery.

svHyLyte: Good idea to check on the grounding foil. Will definitely follow up on that and check to make sure there are no leaks through the positive cables. Thanks.

Don0190: I do not believe that sg has been measured on the batteries. Will discuss this with the yard technician. Unfortunately, you are correct in assuming (as it is becoming more and more clear to me) that electrical part of the boat may not necessarily be their strongest area of expertise.

Once again, thank you to everyone who responded to my inquiry as it gives me a better idea as to which additional areas should be explored and addressed in trying to resolve this issue as well as educate myself better on the topic.

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post #12 of 15 Old 10-15-2013
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Re: Problem with new batteries keeping the charge

It may or may not have anything to so with your current problems (no pun intended), but a cycle counter (clicky-clicky) hooked up to the bilge pump circuit will let you know for sure just how much your pump is working. I put one in my boat and it has twice let me know of problems I otherwise probably wouldn't have caught.

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post #13 of 15 Old 10-16-2013
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Re: Problem with new batteries keeping the charge

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I was told by a battery distributor that for wet cells, some companies actually fill with a different electrolyte (different sg) depending on the climate in the area they are sold to. So if you have "New England" batteries, or "Tropical" batteries, even allowing for temperature corrections there is apparently some difference in what the "right" sg should be, depending on how they were initially filled.

If you really want to keep tabs on the batteries, there are also electronic capacity testers now
Amazon.com: battery capacity tester: Automotive Amazon.com: battery capacity tester: Automotive
Some under $50 and that's a third option. If the tester agrees with the rating, you know they're probably just fine.

I just find anytime I mess with testing sg, there's a new hole burned through something shortly after. And if the electrolyte hasn't had time to equalize in the cell, which can take hours, then you need to suck it up, squirt it back, swirl it around...and let it stand to get the air bubbles out too. SG isn't a panacea either.
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post #14 of 15 Old 10-20-2013
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Re: Problem with new batteries keeping the charge

Depending on the capacity of the new house batteries and the capacity of your charger, there is a very good chance that 3 to 4 hours of charging is not bring the batteries to a 100% charge as several others here have noted. Does the charger indicate that the batteries are fully charged?
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post #15 of 15 Old 10-20-2013
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Re: Problem with new batteries keeping the charge

3-4 Hours is not enough for a full garunteed charge. You are only getting a flash charge. You'll need an overnight charge then 24 hours of sitting time to get a good state of charge reading.
Better yet - get a battery monitor like a Victron BMV 600s and hook it up. Simply using voltage readings for state of charge values is less than optimal.

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