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Old 10-28-2018, 01:23 PM   #1
Tin
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6 Volt AGM-GC2

Considering upgrading to 6 VOLT AGM-GC2 batteries, I am running on the Go Power
GP-PWM-30-UL solar controller. (AGM charge settings: Bulk/Absorption 14.4v / Float 13.7v )
What do you think ? Compatibility with controller ? are there better options ?
can buy all locally.

Oh the Trojan sale ends 10/31/18
https://www.trojanbatteryoutlet.com/...SAAEgLgMvD_BwE

1. Crown 6CRV (220 AH) AGM: $ 230 (seems like good bang for the buck )
(AGM charge settings: Bulk 14.64v / Absorption 14.52v / Float 13.2v )


2.Trojan Reliant T105(217 AH) AGM: $ 215 (Great bang for the buck) On sale @ Trojan until 10/31/18
(AGM charge settings: Bulk/Absorption 14.1v-14.7v / Finish 14.7v ??)

3. Life Line GPL-4CT (220 AH) AGM: $346 (Great battery not sure if it warrants the price)
(AGM charge settings: Bulk/Absorption @ 70F 14.41v / Float 13.39v )

Tin.
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Old 10-28-2018, 02:31 PM   #2
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Quote:
Originally Posted by Tin View Post
...Compatibility with controller ?
...
Tin.
I would do the Trojan personally.
But one thing to keep in mind. Per the Trojan User Guide Page 20:
"W A R N I N G! Deep-cycle AGM or gel batteries should NEVER be equalized."
So be prepared to fiddle with the GoPower solar controller and turn off equalization. The manual was clear but it has been 3 years for me.

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Old 10-28-2018, 02:53 PM   #3
Tin
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I would do the Trojan personally.
But one thing to keep in mind. Per the Trojan User Guide Page 20:
"W A R N I N G! Deep-cycle AGM or gel batteries should NEVER be equalized."
So be prepared to fiddle with the GoPower solar controller and turn off equalization. The manual was clear but it has been 3 years for me.

--
Alan
Thanks Alan for the heads up, I will make SURE to switch over to AGM charge cycle. There does not appear to be a Equalization cycle while on AGM charging.
and yes the Trojans look pretty good especially at that price!
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Old 10-28-2018, 04:10 PM   #4
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Thank-you for starting this thread, Tin, and Thank-You, Alan for your informed answer!

So.....as a very interested observer, the proper size AGM is a ‘direct replacement ‘ to the ETI installed flooded, with the only alteration being reprogramming the solar controller to AGM charging mode?
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Old 10-28-2018, 04:15 PM   #5
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The trojan prices look really good for 6v AGM. It would be a good upgrade and have always heard good reports on the T105.
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Old 10-28-2018, 05:39 PM   #6
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Thank-you for starting this thread, Tin, and Thank-You, Alan for your informed answer!

So.....as a very interested observer, the proper size AGM is a ‘direct replacement ‘ to the ETI installed flooded, with the only alteration being reprogramming the solar controller to AGM charging mode?
Yes, these batteries are GC2 form factor, same as the Interstates escape offers. The differences are many, no need to add water little to no off gassing and more importantly their charge profile aligns much better to both the WFCO and the Go Power solar controller. IMO the Interstate battery are a bad choice for both the WFCO and Go Power solar controller due to an inadequate charge profile, neither can fully satisfy.
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Old 10-28-2018, 05:45 PM   #7
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The trojan prices look really good for 6v AGM. It would be a good upgrade and have always heard good reports on the T105.
Thanks Greg, I to have heard the same but have no personal experience with them. I maybe order a couple Monday morning.
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Old 10-28-2018, 06:54 PM   #8
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Yes, these batteries are GC2 form factor, same as the Interstates escape offers.
The only thing to watch about this is that some battery models described with the industry-standard term "GC2" will be taller, and may cause fit problems in some Escape models (particularly the 21' and 5.0TA, because they need to fit in a box under a dinette bench). Although the Interstates are tall and so these particular brands appear to be okay, another brand might not be.

Length x Width x Height
Interstate GC2: 10 5/16" (262 mm) x 7 1/8" (181 mm) x 11" (279 mm)

Crown 6CRV220: 10.25" (260 mm) x 7.06" (179.3 mm) x 10.94" (278 mm)
Trojan Reliant T-105 AGM: 10.30" (262mm) x 7.06" (179mm) x 10.73" (273mm)
Lifeline GPL-4CT: 10.28" (261.1 mm) x 7.06" (179.3 mm) x 9.92" (251.8 mm)
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Old 10-28-2018, 08:05 PM   #9
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Quote:
Originally Posted by Tin View Post
Yes, these batteries are GC2 form factor, same as the Interstates escape offers. The differences are many, no need to add water little to no off gassing and more importantly their charge profile aligns much better to both the WFCO and the Go Power solar controller. IMO the Interstate battery are a bad choice for both the WFCO and Go Power solar controller due to an inadequate charge profile, neither can fully satisfy.


Excellent! Thanks again!
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Old 10-28-2018, 10:54 PM   #10
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...
and may cause fit problems in some Escape models (particularly the 21' and 5.0TA, because they need to fit in a box under a dinette bench)...
Food for thought, and I know there will be some strong opinions...

I mounted my AGMs inside a framework screwed down to the sub-floor of my E21. Webbing straps are mounted to this framework. A square of plywood covers the whole assembly to protect the terminals against the accidental dropped wrench. But, note the absence of a box or dedicated vent tube. Since leakage is not an issue (they won't leak even if someone accidentally drills a hole in the side - and DON'T ask how I know this), and since venting is not an issue if not overcharged, then the box becomes redundant. Same mounting method I used on my sailboat - where being upside down had to be planned for. Just my opinions here.
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