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Old 29-11-2009, 20:56   #1
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6vdc vs 12vdc - Round 6?

Okay, sorry to bludgeon the battery dead horse here, but I still have some unanswered questions. I am coverting my O'Day 40' for cruising and was just trying to figure out how to fit 6 Trojan 6v batteries under the aft berth where the old bank of 2 group 27's were, when I made a surprising discovery. The yacht I work on just bought a new golf cart for transporting the boss around the marina, and I went to check the water levels today and discovered that the "golf cart" batteries weren't the normal 6v batteries at all, but instead are 12v Trojan T-1275's!
So, here is my question(s) If the 1275s are roughly the same size as the T-105's (width and height the same, but 2 inches longer) and produce 150 amp hrs of 12v power vs the 225 amp hours of 6v power of the T-105s, this would mean that the two of them would produce 300 amp hours while two 105's would still be 225 amp hours. So, bang for the buck in a tight space, isn't the 12v T1275 a better option? Other than the less cumbersome weight, what is the advantage of using 6v if you are going to put them in series anyway??
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Old 29-11-2009, 21:22   #2
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Go for it.
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Old 30-11-2009, 02:20   #3
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Yep....IMO you will have a better system going with what you have ( the 1275's)...However there is a Science that IIRC proves a larger sink source will deplete slower then a smaller one rated the same amperage ....but I would go with what you have if it were my boat.
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Old 30-11-2009, 10:40   #4
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OK ---I'm in the new battery market too.

I just saw a "cyber monday" offering a "deal" on Trojan T-1275s @ $219/ea with free shipping.

Anyone used batteriesinaflash.com before? Is this a decent price? I figure shipping would be a huge expense on these suckers, so a free shipping deal would be good.
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Old 30-11-2009, 11:03   #5
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drat ---darned fine print ......all the big batteries are excluded from the free shipping special! grr
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Old 01-12-2009, 09:28   #6
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The 12v Trojan T-1275's are usually about twice the cost of the 6v T-105's, which can readily be found for around $100 or so each. $200 or so for 2 T-105's vs $400 or so for 2 T-1275's is a good enough incentive for me to stick with the 6v T-105's. If you find that the price is similar for each battery type in your area then of course it's prudent to go with the T-1275's. The beauty of the T-105's is that they are commonly incredibly inexpensive.
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Old 04-12-2009, 07:13   #7
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Actually I found the 1275's locally from our golf cart dealer for $145 each, vs. $105 for the T-105's. But when you consider that I am installing 6 of them for a total price of $870, and it would take 8 T-105's to provide the same amp hours at $105 each, it works out to just $30 difference.
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Old 04-12-2009, 19:08   #8
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Why not use 12 V and keep it simple.

b.
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Old 04-12-2009, 19:31   #9
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If you are going to be cruising to far away destinations then go with batteries that are easy to find replacements for.
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Old 04-12-2009, 21:21   #10
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I can't believe that $145 price. That seems too good to be true.
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Old 05-12-2009, 09:14   #11
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Thumbs up

Yeah, I was surprised at the price also. I figured it was because we just bought a couple of golf carts from him, but I have since found similar prices at a dealer in North Florida and another in N. Carolina. Actually, the guy in North Florida will even install them for that price.
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Old 05-12-2009, 11:07   #12
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Batteries that are not available locally might as well be on Mars. It does little to no good other than as anecdotal information if the best price on a battery is not somewhere that you can easily put your hands on it.
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Old 05-12-2009, 11:13   #13
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Batteries that are not available locally might as well be on Mars. It does little to no good other than as anecdotal information if the best price on a battery is not somewhere that you can easily put your hands on it.
You are exactly right. I sometimes wonder when I read of people buying these relatively exotic, very expensive, high performance batteries who are then going to take off to relatively primitive destinations. Batteries do fail. Its definitely a consideration.
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Old 05-12-2009, 11:14   #14
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Don't forget the cost of the cables and terminals, 6v means more, 2v's mean even more.
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Old 05-12-2009, 11:32   #15
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Yeah, I was surprised at the price also. I figured it was because we just bought a couple of golf carts from him, but I have since found similar prices at a dealer in North Florida and another in N. Carolina. Actually, the guy in North Florida will even install them for that price.
I just got a quote from a local guy in Pittsburgh who says he can get them for $150 each. That is substantially less that the $230 as advertised on line. Would you characterize these batteries as exotic?
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