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Old 08-15-2014, 03:05 PM   #15
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AGM batteries make perfect sense if;

you never again want to worry about adding water.

you never again want to deal with corroded terminals or metal parts near the batteries.

you want your batteries to last 7-10 years (with proper charging.

you never want to mess with your batteries again.

Contrary to popular belief, you will not kill an AGM If you deeply discharge it, as long as you re-charge it soon after the deep discharge.

Lithiums are another story. Extremely expensive ( presently about $8-10/amp-hour), require VERY SPECIFIC charge profiles, and will be damaged by extremely deep discharging, yet they still have all if the other AGM characteristics.

On the plus side, they will outlast anything else on the market with 3000-5000 charge cycles and can be drawn to 80% depth of discharge on a regular basis with no ill effects.

In addition, they are 1/3 the weight of an AGM. I'm presently beta testing a new lithium formula in a pair of 100 amp/hour units. They are replacing a pair of Lifeline GL-6CT AGMs at 300 amp/hours

They will be charged with 500 watts of solar thru a Blue Sky 40 amp MPPT controller.

I'll be starting a thread soon on the results. Stay tuned.


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Old 08-15-2014, 03:08 PM   #16
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What does one need to do to take very good care of these expensive AGM batteries?

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Old 08-15-2014, 04:14 PM   #17
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Keep them properly charged. The less voltage (use) that is removed, the longer they last.

According to Lifeline, at a regular draw of 50%, you can expect 1000 charge cycles. Reduce the draw to 25% and you get 3000 charge cycles Use the batteries lightly at 10% draw and you get 5000 charge cycles.


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Old 08-15-2014, 04:33 PM   #18
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That's not real clear to me.

Driving recharges, or plugging into electricity. I do understand that part.

You're saying, for example, that one should not dry camp for 5 days and run the battery completely down. Better to run them down a bit (an overnite or two), charge by driving, run them down a bit, charge by driving, etc.

Correct?


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Old 08-15-2014, 06:48 PM   #19
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Or do like we did when we dry camped with ours. In the morning turn on the generator while making breakfast. Left genny run inverter for charging, m-wave for cooking and water heater on electric. Exercised the genny and charged the batteries at the same time.
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Old 08-15-2014, 07:05 PM   #20
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Thanks.

We have always tended to use the generator as little as possible....only when necessary or to give it a bit of exercise.

If running it will prolong the life of this expensive battery, however, I will do things differently.


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Old 08-15-2014, 08:01 PM   #21
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Depending on a vehicle's alternator, which is a single voltage charging source, to keep an AGM battery properly charged is like a death sentence for that battery. There is only the constant 14.0-14.2 VDC (at least on my Sprinter) that will not allow a full AGM to float charge and will cause issues in the battery.

I advise all of my clients that have solar to disconnect the vehicle charge line to their new Lifeline batteries (pull the fuse) to allow them to be correctly charged from their 'smart' 3-stage solar charge controllers; and also advise them to use the generator thru their Magnum inverters for charging on inclement days, as the Magnum's charger is about as good as they get.
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Old 08-15-2014, 08:09 PM   #22
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aa9zz: If you want to explore using two 6V AGMs in series, I believe there's a thread on this forum that discusses this option in detail.
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Old 08-15-2014, 09:10 PM   #23
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I have the Tripp Lite, not a Magnum. Does that make a difference in the type of battery and voltage, that I use as a replacement?
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Old 08-15-2014, 09:19 PM   #24
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I have the Tripp Lite, not a Magnum. Does that make a difference in the type of battery and voltage, that I use as a replacement?
I am not totally familiar with the Tripp Lite charging regimen. I do know they use a series of dip switched to adjust the charge profile for different batteries. I would check your manual or call the company to find out the specific voltages that they use for the different settings for battery type.

One of the best features found with Magnum inverter/chargers is their ability to be fully programmed for battery type (charging voltage profile), size of the battery bank (duration of the absorption charge) and full temperature compensation.
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Old 08-18-2014, 11:04 AM   #25
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I asked Airstream what type of batteries they installed in my unit in 2010. They told me the following, "two 12 volt group 24 AMG discovery batteries". I also have the Tripp Lite inverter/charger.

Did they mean AMG Discovery batteries?

If so, since AGM batteries were installed by them and the Tripp Lite was also installed by them, I assume I can leave my unit connected to shore power (as thought I was camping) and the AGM batteries will not over charge?

Help! I need to change the house batteries before an upcoming trip.

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Old 08-18-2014, 11:24 AM   #26
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So, if the stock AGM batteries only lasted about four years,,,,, what is the advantage of paying double for AGM batteries?

This is an honest question, albeit a bit rhetorical...
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Old 08-18-2014, 11:25 AM   #27
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Quote:
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Did they mean AMG Discovery batteries?
The company is called Discover Energy, and the batteries are EV24A-A "dry cell traction batteries." That's what the company calls them, anyway, but they're really just AGMs. They're designed for deep-cycle applications such as electric forklifts.

When I replace mine, I'll go with Lifeline GPL24-T, since there is a Lifeline dealer here in town.

Here is a spec sheet for the EV24A-A batteries that I downloaded a couple of years ago:
Attached Files
File Type: pdf EV24A-A.pdf (815.0 KB, 19 views)
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Old 08-18-2014, 11:29 AM   #28
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So, if the stock AGM batteries only lasted about four years,,,,, what is the advantage of paying double for AGM batteries?

This is an honest question, albeit a bit rhetorical...
Not rhetorical at all. Non-extended Airstream Interstates with the sofa/lounge have a battery box that is notoriously difficult to access; you have to partially disassemble the sofa to do it. That would be a right royal pain in the butt if you had wet cells that had to be topped off occasionally. The extra cost of AGMs is more than made up for, by the savings in aggravation and labor you'd have versus wet cells.
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