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post #21 of 25 Old 09-19-2012
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Re: Which AGM batteries are best

From what I have read, one of the big positives for going from wet to AGM is you do not need to change your charging systems. When I bought my boat it came with Gels and I could not be happier, when i need to replace them it will be with the same.

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post #22 of 25 Old 09-19-2012
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Re: Which AGM batteries are best

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Originally Posted by SimonV View Post
From what I have read, one of the big positives for going from wet to AGM is you do not need to change your charging systems. When I bought my boat it came with Gels and I could not be happier, when i need to replace them it will be with the same.
I don't believe this is correct. An AGM will ruin your alternator or charger without proper voltage/temp regulation for the AGM style.


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post #23 of 25 Old 09-19-2012
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Re: Which AGM batteries are best

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Originally Posted by chef2sail View Post
Fitting a larger alternator which I wanted to do with the serp belt was not an option to me due to the space my engine is in.

I guess I have wasted my money then as are many of us with AGM.
I guess the marine professional we deal with really isn't qualified in his recommendations
I guess the marine industry is duping many of us to buy the AGMs

One thing my marine professional has said to me is the same as you said. You can't beleive what you read on the Internet. Funny these comments are all on the Internet I am reading including the SailNet ones.

Luckily I have already gotten a few years on these Lifelines so I will be waiting for them to expire any day now. Or maybe they will actually last the 8 years I expected them to to beat all the negative expectations I keep reading about to make them financially worth while. I don't jut consider the initial cost of the batteries as the only cost. There is the other associated energy costs to keep them charged.

There is a space issue and access for maintainence which also lead to my decision. There was a safety one where I didn't want H2SO gasses on my boat and in the compartment where I live or spilling around if I had to ork on them around

One of the reasons I chose the electromax on your recommendation which was a good one was the % of charge at lower Rpm. I know that the bank should have a larger charger, but it simply won't fit.

I will show your post to my marine tech. Like both you and Bill it is what he does for a living and he is recognized by people in the Annapolis area as one of the if not the top company and person to use in this area. Maybe I as well have erred in using his advice and expertise. He is independent of brand use and presented me with 3 different scenarios for Haleakulas electrical system. This was the option he suggested. I tend to trust people I can look in the eye, but of course do research on line to try and back up my decision. What I read on the internet is all over the map. So who should I beleive? I choose the best I can from the informstion I get.

I will be interested in his reaction to you and Bills posts as he has a lot of real world experience and customers too.

Dave
Dave,

I don't think you've been "duped" as it sounds as if you made an "educated" decision. You may get your 8 years out of them for how you use them. As I recall you are on a dock. One of the big issues I face with cruisers and many of my customers is that they are not tied to a dock on a regular basis. AGM batteries like to get back to 100% and a dock sailed boat has this advantage over a cruiser or mooring sailed boat. I am still at a loss as to why a larger amperage Emaax would not fit? The 80A model and the 140A model share the same exact alternator case and have identical exterior dimensions.. Only the internals, stator & rotor, are different..

As I have said before AGM's can be the right choice, they have many benefits, space constraints are another good one, but I would be doing many of my customers a disservice by only recommending AGM because AGM's can be a poor choice in some applications for a number of reasons from financial to how the batteries will be charged.....

I install a lot of the 220Ah 6V 4CT batts because they are a standard height and will fit more Ah's than four group 24's will...

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Last edited by Maine Sail; 09-19-2012 at 07:16 AM.
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post #24 of 25 Old 09-19-2012
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Re: Which AGM batteries are best

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Originally Posted by SimonV View Post
From what I have read, one of the big positives for going from wet to AGM is you do not need to change your charging systems. When I bought my boat it came with Gels and I could not be happier, when i need to replace them it will be with the same.
You can often use flooded voltage settings but the acceptance rates of the batteries can tend to smoke small or factory alts not built to handle or disperse the heat. At a minimum I recommend an alternator temp sensor... I have two alternators on my bench right now both cooked by AGM banks.

With a single battery you can often do fine and some factory alts have built in temp compensation but you'll charge very sloooowly when they heat up. However when you get into bank of AGM this is where you really should complete the rest of the system.

These are expensive batteries that benefit from temp compensated charging and temp limited alternators will also benefit.

This is not just limited to AGM's and even a flooded bank that is much bigger than the alternator can suffer the same fate.

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post #25 of 25 Old 09-19-2012
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Re: Which AGM batteries are best

Here are some excellent links for some enlightening reading about a full time cruiser trying to use AGM batteries. I think John finally has it worked out but please DO read it all.. He eschews what I have been observing and trying to enlighten folks about for years. He does a GREAT job at nailing the "issues" and how to over come them.

These articles also display why I feel Lifeline battery is one of the best AGM makers out there. Justin has given John and Phyllis his full support and has NOT been bashful about having any of it posted on the internet so folks CAN get the best life out of Lifeline batteries..

AGM Batteries Test #1

AGM Batteries Test #2

Charging AGM's With An Alternator On A Cruising Boat

Problems With Using Battery Chargers To Charge AGM Batteries


18 Month Test Report

Equalizing Batteries On A Live-aboard Sailboat


Eleven Steps TO Better Battery Life

Direct Link To All John's AGM Articles

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