The AGM can be charged faster but that is not the same as saying that they will charge faster in a typical RV setup. Obviously lots of variables involved.
I switched to an AGM battery as I am planning on adding 1-2 more batteries and wanted all of them to be the same type for charging purposes and the second location is not vented. With the AGM the batteries can be placed in any orientation other than on their tops so this is also an advantage when adding additional ones to a RV where there are space constraints.
"Everyone is still forgetting about the +.2vdc difference between FWC's and AGM's for a given SOC, the AGM's being the higher...That is quite significant. That equates to a difference in SOC between the two of about 15% for a given voltage. A charger works on the difference in voltage between the charge voltage and the voltage of the battery"
That would account for some of what people could be seeing with their AGMs but is not the huge amps diff being claimed by some. Also some AGMs will do more amps than others, just to confuse things even more.
2003 Chev 2500HD Gas, 2003 Komfort 26FS 5er
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"Guess we stick with the advantages of AGM's as....
1. Zero maintenance
2. Minimum temperature sensitivity
3. Low drain when in storage, not hooked up...1% a month v/s FWC's 10%.
4. Minimum Sulfation during storage and use."
Many folks cite the rapid re-charge of Lifeline AGM's as a benefit for all AGMs.
But answer this.. If you have, as I do, a converter designed to charge a pair of GC-2 batteries, (30 amp hours worth) And I replace them with say 230 amp hours worth of AGM's. how much faster will they recharge (Perhaps 2 or 3 minutes over all.. Yes, MINUTES. That's right, not a noticable difference.
Now if I upgraded to say an 800 amp converter (Man would that dim the lights in teh campground) Then I'd have something. (AN overweight condition on my gasser, that's what).
I will describe the batteries I have had in my coach.
OEM a pair of Interstate U-2200's ... Still going strong at 7 years
A few Maintenance free I had lying about from before I got the MH, now dead
2 AGM's I purchased in, as I recall 2006) About a year younger than the MH, Now dead, they were the youngest batteries in the house, and the first to die.
I will not be buying more for that use. Replaced with Maintenance free (This year).
Nothin adds excitment like something that is none of your business
Kenwood TS-2000 housed in a 2005 Damon Intruder 377
We need a topic where we can discuss AGM batteries without getting flooded(pun!).
1. They cost more.
2. They have special charging requirements.
3. They have poor weight : AH ratios.
4. They are hard to maintain.
OK, here is where the myths stand.
1. We need a TCO analysis.
It is true that AGM costs more $/AH at initial purchase.
We need to consider the cost of the special charging requirement for FWC. There is time and expense of correcting corrosion of cabling. There is the cost of rebuilding corroded battery racks to consider. IOW, what are all the things AGM folks avoid?
Perhaps AGM folks believe all that avoiding is priceless.
A new myth has been identified;
5. AGM does not charge faster.
I don't care. Noone is claiming that FWC is faster!