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 > AGM Deep Cycle batteries

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BFL13

Victoria, BC

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Posted: 05/14/22 06:46pm Link  |  Quote  |  Print  |  Notify Moderator

Do you have a monitor that shows amps and volts so you can tell when during being charged at constant 14.4v they are down to 1/2 an amp per 100AH of bank ?

Do you have a charger that stays at 14.4v until amps get to that at which time you are supposed to drop the voltage to 13.x?

How do you get your charger to do that when you want it to and not before?

Can your charger meet the 20% charging rate specs for Trojan, Lifeline, etc AGMs ?

Is your gen big enough to run the charger doing that many amps?

If so, good to go

* This post was edited 05/14/22 07:58pm by BFL13 *


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Veebyes

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Posted: 05/14/22 07:30pm Link  |  Quote  |  Print  |  Notify Moderator

Rather than 2 X 6V GC AGM batteries & have used a single 4D case size AGM. On my second battry now. The first had a lifespan of 9 years. Each year having 5-6 months use with a mixture of mostly with power sites but also some dry camping.


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pianotuna

Regina, SK, Canada

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Posted: 05/14/22 07:31pm Link  |  Quote  |  Print  |  Notify Moderator

Hi,

I'm having excellent results from telecom batteries. I got them at the Interstate store. When one battery in a string in the tower goes bad, they replace them all. They are tested and "reconditioned" and have a warranty.

I do have an upscale charger, and solar, too.

So I got 556 amp-hours of batteries for $395 (usd).

I'll replace them with SiO2 when the time comes.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

dodge guy

Bartlett IL

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Posted: 05/14/22 08:47pm Link  |  Quote  |  Print  |  Notify Moderator

AGM is far, FAR superior to flooded lead acid. AGM is a much better choice!

Although recently their have been some quality LifePo batteries that ar good quality.


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Flapper

Minnesota

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Posted: 05/14/22 09:34pm Link  |  Quote  |  Print  |  Notify Moderator

Per the other question - just like flooded batteries, fully charged AGM's won't freeze until they get to -74F.
I have two Grp 31 AGM's in my boat, that is stored "indoors" but at outdoor temps all winter here in Minn. (Oct to May). This will be year 12 for them. Yeah, I'm pushing my luck, but they have been amazing. Came out of storage this spring still at 95% fully charged. I always just fully charge, disconnect all cables at one terminal, and forget about them till spring.


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time2roll

Southern California

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Posted: 05/14/22 09:55pm Link  |  Quote  |  Print  |  Notify Moderator

ivbinconned wrote:

The converter is a WFCO 55 amp. I’m sure it’s original In a 2009 Cedar Creek.
Seems to me this converter will not start to even charge if the temps are really low.
Good time to upgrade the converter and stop undercharging the batteries.
Although I assume the WFCO never hits boost voltage putting 14.4 volts on the battery. This is also the reason the charging is terrible at low temperatures.

No particular reason to go 6v in AGM format. I recommend Lifeline if going AGM.

AGM is a bit better at freeze resistance but can still be damaged if low on charge well below freezing.


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