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Old 11-25-2013, 11:13 AM   #21
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You won't go wrong by sticking with the Lifeline.
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Old 11-30-2013, 07:28 AM   #22
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Odyssey!!!!

And FF, while you are correct reference the need for LOTS of amps to recharged, that is not the only advantage of AGM batteries. AGMs can take more abuse than wet batteries. If you treat wet batteries perfectly, they will serve you well and it is difficult to argue the value of AGMs. BUT, I don't live in a perfect world and shit happens. Shit like somebody unplugging your boat and DC power running down your batteries to nothing and then your. Boat sitting unattended for weeks with dead batteries. That will be near death for a wet battery. Not so for AGM. Also, AGMs do not gas like wet batteries do nor do they leak...more advantages. So while we don't often have the ability to take advantage of the rapid recharge rates offered by AGMs, there are other advantages. And given an imperfect world, they do last longer.
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Old 11-30-2013, 08:37 PM   #23
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Lifeline's have a good rep.

For those considering changing from AGMs to flooded batteries, make sure your battery boxes and compartments are suitable for flooded batteries. Many Nordhavns are set up for AGMs and don't have battery boxes capable of capturing spilled electrolyte. ABYC calls for such a containment box for flooded batteries. I think there are also venting requirements, but I'm not sure.
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Old 11-30-2013, 08:57 PM   #24
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Lifeline recommends a charge rate of not less than 20% of the AH of the batteries. I doubt many trawlers have that ability as the battery banks are typically in excess of 1,000 AH.

I would think most owners ignore this requirement with the AGMs.

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Old 12-03-2013, 01:02 PM   #25
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Lifeline recommends a charge rate of not less than 20% of the AH of the batteries. I doubt many trawlers have that ability as the battery banks are typically in excess of 1,000 AH.

I would think most owners ignore this requirement with the AGMs.

Marty
The purpose of that is so that they can desulfate. Maybe a separate desulfator would help in that situation. My batter banks is about 550ah. That means I would need 110 amps according to your spec. I might be able to get there with the alternators running at cruise speed. My battery charger is 80 amps and I think it has a peak higher than that although I can't remember. Anyways, I might be close. I was speaking with an Odyssey rep and I don't remember the math she was using but I was well short on charging capacity according to her calculations. Anyway, that was the reason she gave me for high amperage charging...desulfating!
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Old 12-03-2013, 04:31 PM   #26
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Oliver,
Stick with the 8D Lifelines. I'm on my second set of Lifelines, 6v ones in my case, and I think they are a quality product.

One suggestion I would make is to contact Lifeline tech support, describe how you use your boat and batteries (what % at dock or anchor, loads, etc and what charger you have) and they can recommend what voltages to charge at and how often to equalize to maximize the life of the batteries.

Another resource is Attainable Adventures which did a long term evaluation on Lifeline AGM batteries. He has some very good recommendations on how to extend the life of the batteries, as well as being an excellent resource on cruising in general.

Frank
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Old 12-03-2013, 05:17 PM   #27
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Oliver, Stick with the 8D Lifelines. I'm on my second set of Lifelines, 6v ones in my case, and I think they are a quality product. One suggestion I would make is to contact Lifeline tech support, describe how you use your boat and batteries (what % at dock or anchor, loads, etc and what charger you have) and they can recommend what voltages to charge at and how often to equalize to maximize the life of the batteries. Another resource is Attainable Adventures which did a long term evaluation on Lifeline AGM batteries. He has some very good recommendations on how to extend the life of the batteries, as well as being an excellent resource on cruising in general. Frank
Thanks, were going get them all pulled and replaced by our battery guy. Ain't cheap, but they'll go for another 10 years (their original batteries).
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Old 12-05-2013, 07:41 AM   #28
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>Ain't cheap, but they'll go for another 10 years (their original batteries). <

Perhaps , a really deep discharge will reduce the battery capacity and life the same as 1/2 priced LA wet batts.

AGM ARE harder to destroy , but a lack of information makes it really easy to kill any style..

Do you have a SOC meter? Or even just a low voltage alarm?

Knowledge is Power! Just ask the NSA.
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Old 12-05-2013, 07:43 AM   #29
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>Ain't cheap, but they'll go for another 10 years (their original batteries). < Perhaps , a really deep discharge will reduce the battery capacity and life the same as 1/2 priced LA wet batts. AGM ARE harder to destroy , but a lack of information makes it really easy. Do you have a SOC meter? Or even just a low voltage alarm? Knowledge is Power!
Nope But we're going to add one.
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Old 12-12-2013, 04:48 PM   #30
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Just found out we actually have 10 batteries total, long story. But yay more batteries!
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Old 12-12-2013, 05:38 PM   #31
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Do you have room for L16 size? I replaced my 8Ds with L16s because they are easier to move (less weight per battery) and more amp hours (taller). LA or AGM either way.
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Old 12-12-2013, 05:42 PM   #32
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Do you have room for L16 size? I replaced my 8Ds with L16s because they are easier to move (less weight per battery) and more amp hours (taller). LA or AGM either way.
No all off our battery boxes are setup for 8D's.
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Old 12-12-2013, 05:47 PM   #33
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L16's fit in 8D boxes if they do not have tops on the boxes or there is room to raise it.
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Old 12-12-2013, 05:53 PM   #34
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L16's fit in 8D boxes if they do not have tops on the boxes or there is room to raise it.
Thats the problem there's no heighth above them.
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Old 12-30-2013, 10:30 AM   #35
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Battery madness!
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Old 12-30-2013, 10:41 AM   #36
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My back hurts just looking at that picture! Who was it that decided 150 pound batteries were a good idea on boats? I think we should hunt him down and kick his ...
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Old 12-30-2013, 10:49 AM   #37
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I agree :-) :-)
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Old 12-30-2013, 11:00 AM   #38
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It's hard to get the big picture of that space from the pic. Is there some way to rig a lifting device to the overhead? Perhaps fabricate a sliding tray of some sort? Marine consignment stores are loaded with all sorts of blow-boat contraptions to add mechanical advantage. you just need something to take some of the weight so you can readjust your own body mechanics to guide them into place. I plan to made a large, and quite heavy duty, battery tray the next time I have my batteries out to not only aid in installation, but to make it far easier to check the water.
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Old 12-30-2013, 11:48 AM   #39
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It's hard to get the big picture of that space from the pic. Is there some way to rig a lifting device to the overhead? Perhaps fabricate a sliding tray of some sort? Marine consignment stores are loaded with all sorts of blow-boat contraptions to add mechanical advantage. you just need something to take some of the weight so you can readjust your own body mechanics to guide them into place. I plan to made a large, and quite heavy duty, battery tray the next time I have my batteries out to not only aid in installation, but to make it far easier to check the water.
We used the davit to lift them from the dock to the lazzerette. It definetly saved backs, hopefully we won't need batteries for another 8-10 years.
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Old 12-30-2013, 11:59 AM   #40
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I have a 2 foot long piece of 1/4 aluminum, about 4" wide, that worked as an excellent pry to lift up the side of my batteries, then the batteries slide beautifully on the bar so they do not have to be lifted but slide with not too much resistance on the aluminum. For batteries, it is as slippery as star-board. Slid them right on to a hand cart. Depending if they are in boxes, or not.
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