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Go Back   SailNet Community > On Board > Gear & Maintenance > Battery Recommendations
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Topic Review (Newest First)
03-24-2013 10:59 PM
eherlihy
Re: Battery Recommendations

Quote:
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..
03-24-2013 10:15 PM
jsaronson
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.
03-22-2013 01:03 AM
chef2sail
Re: Battery Recommendations

Quote:
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
03-21-2013 10:55 PM
Maine Sail
Re: Battery Recommendations

Quote:
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...
03-21-2013 10:43 PM
jsaronson
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.
03-21-2013 09:26 PM
Oaksail
Re: Battery Recommendations

Quote:
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.)
03-21-2013 10:47 AM
asdf38
Re: Battery Recommendations

Quote:
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.
03-21-2013 03:21 AM
chef2sail
Re: Battery Recommendations

Quote:
Originally Posted by Oaksail View Post
I don't see the physical numbers as you mention. I'm about to pull the trigger on adding 2 group 31 batteries to my house bank, but maybe i should reconsider.

Trojan T-125 - 6 volt 240 AH,
Weight: 66 lbs
Size (inches): L-10.38 W-7.13 H-10.88
Volume: 803 cu-in

Group 31 dimensions
L 13"
W 6-3/4"
H 9-3/8"
Volume 822.7 cu-in.

The advantage for the 6 volt is only 2.5% (803 cu-in / 822.7 cu-in.) however most group 31's are rated for 115 amp hour so 2 will give you 230. another 4% in favour of the 6 volt, but combined its only 6.5%

Am i missing something? I would love to get the capacity you're talking about.
I look at it in 2 dimesions for fitting as height if it fits is irrelevant.

For my bank 6- 6 volts= 660ah ( 330 usable) 10.38X7,13X6= 444 sq in
6 group 31= 690 ah (345 usable) =13X6.75X6=526.5 sq in.

(526.5-444)/ 444= 18% space savings for virtually the same ah

330 ah usable and our diet is 78 ah/ day.
03-21-2013 12:46 AM
chef2sail
Re: Battery Recommendations

Quote:
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.
yes
03-21-2013 12:29 AM
T37Chef
Re: Battery Recommendations

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.
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