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Old 07-10-2012, 06:31   #1
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edwmama's Avatar

Join Date: Jun 2008
Location: southern california
Boat: cal cruising 46
Posts: 71
Battery water level

Can anyone tell me or educate me on this issue that baffles the heck outa me?

Besides my separate starter batteries I have two sets of house battery. One set consists of two 4D connected in parallel. Another set contains four 6V batteries in which 2 pairs are in a series which In turn are in a parallel connection. My question is. Why is it then when I go to top off the water the 4D never require water but the 6 V always do even though the 4D are my primary bats? I am using the 4D and they are always full and the 6V are back ups yet there always low every two months? Mysterious



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Old 07-10-2012, 06:47   #2
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Join Date: Oct 2007
Location: Lakewood Ranch, FLORIDA
Boat: Alden 50, Sarasota, Florida
Posts: 2,323
Re: Battery water level

Are they co-located? Same ambient temp? Same vent caps? Same charging source and same voltage? Same age and condition? Difficult to make comparisons with so many variables.
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