Group 27 & 24 Deep Cycle Batterries

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Group 27 & 24 Deep Cycle Batterries

Postby boatguy » Fri Feb 12, 2010 9:03 am

Arild, I currently have one house bank of 6-Group 27 DC Lead Acid WM batteries and the other house bank is 6- Group 24 DC-LTH Lead Acid batteries.
I think i have a storage capacity of about 600 A/H per bank.
Is there a benefit to go to 2-8D's per bank, or 6 Golf carts series to 12V banks?
Cost 4-8D's @ $400.00 ea?
12- Golf Carts @ $100.00 ea?
I have the storage bank boxes that currently hold 6 of each per side, in the engine room of my 42 ft Trawler.
I have two independant start baterries for the engines.
I use a 60 amp Prosine charger for the house banks and a PS 40 amp charger for the start banks.
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Re: Group 27 & 24 Deep Cycle Batterries

Postby elnav » Fri Feb 12, 2010 2:11 pm

Personally I have not had much success with size 8D deep cycle batteries. The one exception being Concorde Lifeline brand. However most of the 6 V golf cart deep cycle do appear to be true deep cycle batteries instead of rebranded truck start batteries. I have even gone so far as to cut off the tops of so called 'deep cycle' size D8 batteries. Inside I found what looked very much like ordinary thinner plate start batteries.
Whether you use the smallest T105, mid sized T305, or the really big L16 two of them fits the same foot print as one D8 but contains as much or more amp hour capacity and give good service when charged correctly.
My preference would be for using 6V golf cart deep cycle batteries.
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Re: Group 27 & 24 Deep Cycle Batterries

Postby elnav » Fri Feb 12, 2010 2:12 pm

Personally I have not had much success with size 8D deep cycle batteries. The one exception being Concorde Lifeline brand. However most of the 6 V golf cart deep cycle do appear to be true deep cycle batteries instead of rebranded truck start batteries. I have even gone so far as to cut off the tops of so called 'deep cycle' size D8 batteries. Inside I found what looked very much like ordinary thinner plate start batteries.
Whether you use the smallest T105, mid sized T305, or the really big L16 two of them fits the same foot print as one D8 but contains as much or more amp hour capacity and give good service when charged correctly.
My preference would be for using 6V golf cart deep cycle batteries.
Arild Jensen
Custom electrical design for cruising boats
Telephone: 250 998 4474
Site: http://www.electronicnavigator.com
Email: mailto:2elnav@netbistro.com
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Re: Group 27 & 24 Deep Cycle Batterries

Postby capn chuck » Fri Feb 12, 2010 4:49 pm

Arild, Your repeating yourself:) I wanted to add, that we replaced our 8D batteries several years ago and have been delighted with the results. The big savings in cost, the ability to replace one smaller battery if we lost a set and the smaller footprint in addition to our ability to get the batteries on and off the boat without a lift make this a smart choice. With extensive charging and discharging cycles while cruising we get about seven years out of a pair and it is usually one battery that starts to weaken. But at seven years we replace the pair just to be safe. Chuck
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Re: Group 27 & 24 Deep Cycle Batterries

Postby elnav » Fri Feb 12, 2010 4:57 pm

I once got curious why 8D batteries were specified so often. Answers ranged from "well everybody else does it" to that is the way it has always been done'. Rarely did I encounter anyone who truly looked into the subject and sought to find a better solution. Most of the time those who did were considered mavericks or eccentrics or else totally ignored. DIY boat owners do not count as industry experts. :-(((
So the subject bears repeating. Maybe in another 10 or 20 years industry designers will get the message and do something better as the norm.
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Re: Group 27 & 24 Deep Cycle Batterries

Postby capn chuck » Fri Feb 12, 2010 8:54 pm

I have always been a firm believer that every designer, engineer, draftsman or anyone else connected to the marine industry, including the guy that sweeps the factory floors, must spend no less than one year working in the field, crawling around in bilges, and repairing equipment before they are ever allowed to design or build a piece of equipment or a boat. If that were the case we would see much more sensible designs and solutions. Chuck
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Re: Group 27 & 24 Deep Cycle Batterries

Postby elnav » Sun Feb 14, 2010 12:48 pm

I would agree but it ain't gonna happen in my lifetime
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Re: Group 27 & 24 Deep Cycle Batterries

Postby dogdidit » Wed Dec 21, 2011 11:17 am

Hi, I just saw some golf cart batteries at Costco for $ 80.00 each. This might save you some money.
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