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Old 14-05-2013, 10:28   #46
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Re: Rolls versus AGM Batteries

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I agree that Flooded LA has many advantages over AGMs, but many boats have the batteries located when watering them is difficult to impossible, furthering the likelihood that they will be allowed to run dry. Also, many boats are built assuming AGMs and the "compartments" are not suitable to flooded batteries, i.e. they offer no leak containment, inadequate ventilation, and are located in areas that are not ignition protected.
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Also, many boats are built assuming AGMs and the "compartments" are not suitable to flooded batteries, i.e. they offer no leak containment, inadequate ventilation, and are located in areas that are not ignition protected.
Misleading statements this, AGMs have all the failure modes of LA,

Then buy VRLAs, AGMS can also vent , AGM has no beneficial advantages over sealed LA and some disadvantages. flooded accessible cells are better,

"venting requirements " are a bit over hyped anyway.

dave
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Old 14-05-2013, 10:37   #47
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Re: Rolls versus AGM Batteries

Charge acceptance is much better with AGM over flooded. Also charge rate is better. A flooded shouldn't be charge higher than a 0.1 C rate, a good AGM like an Odyssey can be charged at 1.0 C.
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Old 14-05-2013, 10:54   #48
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Re: Rolls versus AGM Batteries

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Originally Posted by deckofficer View Post
Charge acceptance is much better with AGM over flooded. Also charge rate is better. A flooded shouldn't be charge higher than a 0.1 C rate, a good AGM like an Odyssey can be charged at 1.0 C.
Right and for an EV great

so in your boat with a say 500 AH battery bank , you have a 500A charge source!!


Im not denying that AGM have superior characteristics, just that those are not relevant in a typical cruising boat, whereas there disadvantageous characteristics are relevant ( partial charge sensitivity, overcharge sensitivity, Gas venting in extremes, etc)

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Old 14-05-2013, 11:03   #49
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Re: Rolls versus AGM Batteries

I'm agreeing with you Dave, that is why I said in EVs and remote home sites, but the latter is how we use them on boats. Maybe no one as used (6) 700 a-hr 2 volt AGM's in series for their house bank, but it would be a robust, long lived bank if treated right.
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Old 15-05-2013, 01:33   #50
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Re: Rolls versus AGM Batteries

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AGMs have no place on a boat, they have good characteristics that cannot be typically exploited on a normal boat and bad characteristics that unfortunately do manifest themselves on a boat.....
An old thread but lots of good and bad advice like this quote!!!

Maybe goboatingnow has had bad experiences with AGMs or knows a friend who has.

Nobody has yet made the point that NOT ALL AGMs are the same, so the Q "Rolls versus AGM Batteries?" is not a fair question. "Rolls versus Lifeline AGM Batteries?" would be a better comparison.

Many AGMs are not designed for faster charging or high charge rates, and many are specifically designed as Solar or Telecom standby batteries so are not robust enough for regularly falling off a 3 metre wave in a big sea.

We are in our 9th year with Lifeline AGMs and the benefits of faster charging and higher rates of charge have worked very well for us. We have a 280 amps DC genny, large alternator and solar and wind power.

The right AGM does have a place on a boat, even on a normal boat, but get the charging regime right to get the maximum benefit for the high price that you are paying.
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