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Old 04-10-2017, 11:54 AM   #1
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Optima Gel battery

When looking at a starting requirement. I see a blue top and a red top group 34 in the optima batteries.
Can not really see why i would want one over the other.
What is the difference besides cost?

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Old 04-10-2017, 12:13 PM   #2
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The Blue Tops are pushed for marine/rv with the sae plus 5/16" ss studs.
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Old 04-10-2017, 12:28 PM   #3
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There is very little difference between the two, probably packaging. Definitely get the ones with studs. They are AGMs, not gels BTW.

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Old 04-10-2017, 01:25 PM   #4
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what is the difference between gel and AGM?
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Old 04-10-2017, 01:36 PM   #5
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http://bfy.tw/B9Hq
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Old 04-10-2017, 03:08 PM   #6
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I went with the red topped batteries for both starting and bow thruster. My reasoning was that they were both limited high surge applications. Very happy so far with my choice.

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Old 04-10-2017, 03:11 PM   #7
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BTW Summit Racing has great prices on Optima batteries with no shipping or core chsrges.

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Old 04-15-2017, 03:57 PM   #8
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Any thoughts as to a carbon foam battery. Can deplete to ZERO (via reports) and no damage.
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Old 04-15-2017, 04:57 PM   #9
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Here is a little more information about the carbon foam batteries.
From a Trawler Forum member.

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Old 04-15-2017, 05:43 PM   #10
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That is a "category of one", Firefly is it, not to be confused with Outback "nano carbon".

And 20% DoD is the lowest I'd go myself, sizing for usually 30-40% will give you more cycled.

The sulfation recovery process every once in a while takes a bit of skill/knowledge, equipment and attention, but it's not rocket science.

Next best thing to LiFePO4 for PSOC situation, not nearly as expensive.

But jury is still out on longterm/widespread feedback to confirm Nigel Calder & Maine Sail's testing results.

Which it looks like I lost the link for, was in Practical Sailor magazine.

Note Bruce from that video, the inventor of the Firefly, Nigel and MS all live near each other there in Maine, you may hear some (not me) say that as if a reason to be skeptical.
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Old 04-15-2017, 05:48 PM   #11
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I would think PSOC would not be a problem for most trawlers?

Unless "boondocking" on the hook I suppose.
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Old 04-15-2017, 05:56 PM   #12
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I'm over at Fisheries right now and walked into this scene Click image for larger version

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Old 04-15-2017, 06:26 PM   #13
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Excellent! Above or below $482?
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Old 04-15-2017, 06:30 PM   #14
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$488
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Old 04-15-2017, 06:31 PM   #15
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And no shipping, so cheaper.
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