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Old 05-19-2018, 11:23 AM   #1
Rivet Master
1988 25' Excella
1987 32' Excella
Knoxville , Tennessee
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Do AGM batteries provide more power than flooded cell

I was not going to change my converter. So I bought new flooded cell batteries a couple of weeks ago. Then I found time and put in the new 4 stage converter.

So my decision now is whether to put in AGM's before a long trip this summer and do something else with the flooded cell, or to just use the flooded cell.

So my question is not how long they last in years, but rather, will I get more usable power from the AGM's when dry camping? Any idea as to how much? For instance if the FC last 3 days how much longer will the AGM's go at the same daily usage? And I do not have an inverter. I do run a CPAP at night so I have to watch the charge.

I am using group 27, 12 volt batteries. I could find a way to eat the flooded cells if the AGM's are a big upgrade in power. If they are close (20% or less) I will just use the FC's.
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Old 05-19-2018, 11:51 AM   #2
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2017 26' Flying Cloud
Alamo Heights , Texas
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12V to 12V I'd guess it falls under "20% or less." At least in theory, you can pull an AGM below 50% with LESS effect on its overall service life than you can a flooded lead-acid, but there's a point at which your inverter will throw in the towel anyway. I abused a 100AH "Universal" (ups-style) AGM for years running my CPAP in the Argosy. After the first couple of trips I wished I'd bought a much smaller battery (I used the CPAP's rated specs rather than measuring its actual current draw with a kill-a-watt or similar meter). as far as I can tell that 100AH beast is nearly as healthy as when it was new.

What I'm considering is a pair of 6V GPL-4CT AGMs to replace my Group24s when they get old. THAT should get me about a 50% increase on the group24s, or about 20% more than a set of Group27 12v batteries.
— David

Zero Gravitas — 2017 Flying Cloud 26U | WBCCI# 15566

He has all of the virtues I dislike and none of the vices I admire. — Sir Winston Churchill
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