AGM vs Flooded - Page 2 - Fiberglass RV


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Old 09-07-2016, 07:36 PM   #15
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Originally Posted by LyleB View Post
Add to your list that AGM batteries do not off-gas so they can be placed inside the coach without extensive venting. Also, I believe, they can be oriented in any position, do not need to be kept upright.

Correction:
Well, in spite of hearing several folks tout the fact that AGM batteries do not need venting, Mike (Civilguy) kindly corrected me on this point. Apparently, in normal operations, an AGM battery does not off-gas hydrogen. It is possible, however, for a malfunctioning charger to cause an internal safety valve in the battery to release hydrogen gas, which is very explosive. For this reason, virtually all the manufacturers and others in the know suggest and/or require that ALL batteries should be vented to the outside.
I sent Lyle a link to a site that indicates it is a wise practice to vent AGM's.

https://www.boats.com/how-to/sealed-...-need-venting/

I also looked at a battery distributer's site, Fisher, that indicates otherwise.

AGM Batteries - Batteries by Fisher

I've seen both of these web pages in the past; they readily pop up when you search the subject. It wasn't my intent to say that Lyle was wrong, more that the information is hazy.

Byron's "Welcome to the world of Internet forums" comment kind of sums it up.

Personally, I have an existing vent in my existing battery compartment, so this aspect doesn't really matter to me. If I were to add another battery compartment I'd probably find a way vent it. That's my personal comfort level. Other people's comfort level will vary and that's fine too.

I think the larger issues here are the respective technical merits and limitations of AGM vs. flooded cell, along with the potential cost benefit equation. I will continue to read most anything I find online, searching for something that I will decide to adopt and believe, however right or wrong, but hopefully at least a sort-of-true simplification that serves to get me down the road.

So, folks, please carry on. We can now return to our regularly scheduled discussion.
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Old 12-10-2016, 03:02 PM   #16
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I am looking at an AGM battery for the reason that I only have enough room for one group 24 size battery and they seem to carry more dense power for the size.
OR is this manufacturers hype?
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Old 12-10-2016, 04:03 PM   #17
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It's a hype. The only advantage of AGM and sealed batteries is no hydrogen outgasing, the batteries could be used inside living compartment. If you need more dense power for the size, then look at Lithium batteries. But they could cost you more than your trailer costs...
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Old 12-10-2016, 04:54 PM   #18
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It's a hype. The only advantage of AGM and sealed batteries is no hydrogen outgasing,...
Well, my first one lasted 8 years. The fridge, accidentally turned on DC, killed it. Every year I put my battery in the basement for the winter. I charge it once. Low self discharge. You can buy one on the internet and UPS can deliver it. And because of the low outgassing, the spark that occurs when I disconnect will not result in a explosion. It's a very safe battery. That's why I have one. Raz
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Old 12-10-2016, 06:44 PM   #19
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Originally Posted by Raz View Post
Well, my first one lasted 8 years. The fridge, accidentally turned on DC, killed it. Every year I put my battery in the basement for the winter. I charge it once. Low self discharge. You can buy one on the internet and UPS can deliver it. And because of the low outgassing, the spark that occurs when I disconnect will not result in a explosion. It's a very safe battery. That's why I have one. Raz
All good points for an AGM battery. It also charges up to 5 times faster than flooded, which is a good feature with solar. They are safer as there is no spill hazard, you can even mount them sideways if you want.

Prices have come down good too. I bought 2 6V, 225 Ah AGMs for $250 CAD ($200 USD) this summer.
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