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post #11 of 31 Old 05-18-2019
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Re: Any particular brands of AGM batteries to avoid?

Yes 7 years is a good run for those. What % of days per year did they get cycled as opposed to sitting at full?

How deep you reckon the avg discharge on cycling days?

Note EoL standard is at 80% SoH, you could have passed that years ago not even know it without doing a 20-hour load test benchmark.
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post #12 of 31 Old 05-18-2019
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Re: Any particular brands of AGM batteries to avoid?

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Yes 7 years is a good run for those. What % of days per year did they get cycled as opposed to sitting at full?

How deep you reckon the avg discharge on cycling days?

Note EoL standard is at 80% SoH, you could have passed that years ago not even know it without doing a 20-hour load test benchmark.
The batts don't do deep cycles. My batts are generally kept pretty topped up... because they are charged by 110 watts of solar. When voltage does drops indicating they are becoming discharged I will run the engine which has a balmar 614 and a 125 amp alternator. I watch the alts in and when it drops to about 10 amps I usually stop the engine ...unless we need it for propulsion. Never on shore power. Refer is an engine drive so typical sailing day we motor off the mooring/anchor get the sails up and kill the engine and sail. End of the day is reverse. Sometimes we motor sail.. so we are cooling the refrigerator, making hot water and topping off the house bank. All lighting is now LED so that helps a lot too

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post #13 of 31 Old 05-18-2019
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Re: Any particular brands of AGM batteries to avoid?

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.....I watch the alts in and when it drops to about 10 amps I usually stop the engine.....
Your pic shows 2x8D batts, which I'd estimate is approx 450 Ahrs? If correct, 10 amps is a very long way from topped up. Probably wouldn't even go to Float until something in the range of 2-4 amps.

I totally understand why you would stop burning diesel, as the further up the charge curve you get, the slower the charging rate. I'd do the same, when off the dock.

It doesn't seem like you have significant solar either, so the fact that your batteries do so well is interesting. I suppose it could be the very low usage. Essentially zero load, while you're away, right?


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post #14 of 31 Old 05-18-2019
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Re: Any particular brands of AGM batteries to avoid?

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Your pic shows 2x8D batts, which I'd estimate is approx 450 Ahrs? If correct, 10 amps is a very long way from topped up. Probably wouldn't even go to Float until something in the range of 2-4 amps.

I totally understand why you would stop burning diesel, as the further up the charge curve you get, the slower the charging rate. I'd do the same, when off the dock.

It doesn't seem like you have significant solar either, so the fact that your batteries do so well is interesting. I suppose it could be the very low usage. Essentially zero load, while you're away, right?
We don't use much power... none during the week when we're not aboard. Bilge pump is it.

Sailing during the day we have instruments and the AP.
In the evening sailing... rare... we add nav lights, some cabin lights maybe radar
At anchor mooring we splurge...NUC computer and monitor (buck 19 transformer... some lighting.
And the water pumps or the shower pump... not a lot
if it's cold the Espar is used and it sucks some decent amps.
and some USB charging and charging power tool batts (done when motor/inverter is on)

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post #15 of 31 Old 05-18-2019
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Re: Any particular brands of AGM batteries to avoid?

Yes, if barely cycled, any battery will last 10x or more life cycles compared to the normal 40-60% Dod.

In fact calendar life, as if stored on a shelf topped up every couple months,

ends up a greater factor than the avg-DoD vs cycle lifetime chart.

In that scenario, true not worth paying extra for a quality deep cycling bank, and the data from that usage pattern is irrelevant to true deep cycling use cases.

But then the Duracell / Deka don't actually cost any more than the big-box or Amazon pseudo dc units anyway.

In those conditions might last thirty years as opposed to the usual 6-8.

Or you could get by with the little $20 versions 8-)
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post #16 of 31 Old 05-18-2019
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Re: Any particular brands of AGM batteries to avoid?

FWIW my Trojan AGMs are starting their 10th year and seem to be holding their own.
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post #17 of 31 Old 05-19-2019
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Re: Any particular brands of AGM batteries to avoid?

I would avoid Optima since they are now made by Johnson Controls. I have used Optimas in several applications over the years and been very happy with them. I installed one as a starting battery in 2005 and, despite being abused because of a phantom load which took forever to identify, it lasted until 2017. I replaced it with the "same" and, only after purchase realized that it was no longer made by Enersys. After a little over two years it would no longer hold a charge. Just one data point but I just replaced it with an Odyssey which is the current Enersys brand - fingers crossed.

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post #18 of 31 Old 05-19-2019
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Re: Any particular brands of AGM batteries to avoid?

Like my lifelines. Just load tested and all passed after 5 1/2 years of full time cruising. Starter didn’t but that’s because they were over charged when I think Cove haven marina in barrington r.i. missed wired a genset.
Know some people are weight and space sensitive. Some have multiple high draw demands. Others are quite concerned about service life. Personally high quality AGMs were worth it for us. Carbon will be the next set although. But now see WM is selling flooded batteries which won’t spill acid out of the housing if tipped over. Interesting concept and at that price point well maybe a good choice for many.

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post #19 of 31 Old 05-19-2019
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Re: Any particular brands of AGM batteries to avoid?

Yes Optima are fine as Starters, not true deep cycling anymore
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post #20 of 31 Old 05-19-2019
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Re: Any particular brands of AGM batteries to avoid?

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Originally Posted by john61ct View Post
Yes Optima are fine as Starters, not true deep cycling anymore
I think that you misunderstood. This is/was a starter..... and it was junk.

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