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post #21 of 27 Old 03-21-2013
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Re: Battery Recommendations

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Originally Posted by T37Chef View Post
Can I get absolute clarification please...

2 each Group GC2 6V batteries would equal 215 Amp hours, or about 105 usable a/h?

You do not get 215 a/h out of each.
...so technically (and I hope this isn't more confusing) yes you get 215 a/h out of each - its just you need two of them providing current simultaneously to get 12V. Net result, yes, two 6V 215ah batteries combined give you the same as a single 12V 215ah.
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post #22 of 27 Old 03-21-2013
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Re: Battery Recommendations

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Originally Posted by chef2sail View Post
I look at it in 2 dimesions for fitting as height if it fits is irrelevant.
Hi Chef,
My battery storage area like me is vertically challenged. (i have improved the wiring to my batteries over the winter since this photo was taken.)

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post #23 of 27 Old 03-21-2013
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Re: Battery Recommendations

With a combination of 6 and 12 volt batteries will the alternator or battery charger overcharge one or the other? I have a Yanmar 80 amp alternator and an older 10 ap Xantrex.
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post #24 of 27 Old 03-21-2013
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Re: Battery Recommendations

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Originally Posted by Oaksail View Post
Hi Chef,
My battery storage area like me is vertically challenged. (i have improved the wiring to my batteries over the winter since this photo was taken.)
Lots of boats, including most CS built boats are vertical challenged. My new LiFePO4 bank won't fit in the factory location as it is 1/2" to tall. Had to find a new location... Arghh....

This bank is 390Ah and takes up 11.5" W X 14"L in foot print. That's pretty small for a 390Ah bank.. You can get L16's with capacities up to 450Ah in the same foot print...

This bank is going in a custom roto-molded battery box on a Pearson 36-2. It is going in the lazarette. The factory space for batteries on the P 36-2 is very limited so sometimes a custom approach is needed....





BTW when I picked this bank up yesterday (freshly ordered) it was resting at 12.72V (technically "full") yet it took 30A of in-rush current then quickly tapered down to about 5A. After many hours of charging, at 14.8V, it was taking about 0.8A. I then dropped the voltage back down to 14.4v for about 5 more hours and it was then taking just 0.1A at 14.4V. This is a FULLY charged 390Ah battery taking just 0.1A to maintain 14.4V or just 0.02% acceptance.

This is why we rarely if ever see a true "full" on sailboats. I started at "full", based on open circuit voltage, and it still took many hours to actually get to a true full charge...
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post #25 of 27 Old 03-22-2013
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Re: Battery Recommendations

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Originally Posted by Maine Sail View Post
Lots of boats, including most CS built boats are vertical challenged. My new LiFePO4 bank won't fit in the factory location as it is 1/2" to tall. Had to find a new location... Arghh....

...
I had the same problem with our C&C35MKII space for the batteries was tight and height challenged for 6 volts.

I actually enlarged the space and raised the quarter berth 1 inch, so I had a beter compartment for the batteries


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post #26 of 27 Old 03-24-2013
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Re: Battery Recommendations

With a mix of 6 volt and 12 volt batteries will the alternator or battery charger overcharge one or the other? I have a stock Yanmar 80 amp alternator and an older 10 amp Xantrex.
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post #27 of 27 Old 03-24-2013
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Re: Battery Recommendations

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Originally Posted by Oaksail View Post
Hi Chef,
My battery storage area like me is vertically challenged. (i have improved the wiring to my batteries over the winter since this photo was taken.)
Are those wet-cell batteries???
It must be an all-day affair to check the electrolyte level..


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Last edited by eherlihy; 03-24-2013 at 10:01 PM.
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