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Old 06-26-2017, 07:38 PM   #1
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AGM batteries

I am working on my build sheet for a 19 to be completed late November. I asked ETI about installing AGM dual 6V batteries instead of the the batteries they normally supply. They are happy to to do that if I supply the batteries. My 19 will used primarily in "boon docking" mode with a combination of fixed 160W roof panel and portable solar. My question is whether or not the extra cost for AGM batteries is worth it.
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Old 06-26-2017, 07:54 PM   #2
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Go with the standard Interstate 6V batteries. 232ah, and they perform well. With the same setup we never run out of power when boondocking. Maintenance? Have never had to fill them yet.

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Old 06-26-2017, 08:26 PM   #3
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I agree with Robert. The twin 6v Interstates have been great and never been close to 50% discharge with quite a bit of boondocking. We have the 160 factory solar and it's been all we've needed to date.
If I were getting the 21 I'd definitely get the AGM's since the batteries are inside the cabin.
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Old 06-26-2017, 08:30 PM   #4
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Other than air conditioning, the whole trailer can operate off propane and 12v and my batteries are full around 10 am. If you need more, another owner added a second set of dual sixers plus the inverter. More power, arrrrgh, arrrrgh!!!
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Old 06-26-2017, 08:31 PM   #5
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I agree with Robert. The twin 6v Interstates have been great and never been close to 50% discharge with quite a bit of boondocking. We have the 160 factory solar and it's been all we've needed to date.
If I were getting the 21 I'd definitely get the AGM's since the batteries are inside the cabin.
Yeah, that's true Greg. Accessibility and offgassing are concerns when the batteries are indoors. Another reason I love the setup in the 19.

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Old 06-26-2017, 10:19 PM   #6
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Have a good nose and have never noticed a smell with our dual 6V under dinette bench. Would go AGM next time if they drop in price significantly.
Edit: very glad not to waste space or weight capacity with dual 6V in the front box!
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Old 06-26-2017, 10:47 PM   #7
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Have a good nose and have never noticed a smell with our dual 6V under dinette bench. Would go AGM next time if they drop in price significantly.
Edit: very glad not to waste space or weight capacity with dual 6V in the front box!
Hydrogen is odorless.

The space is "wasted" somewhere. Either under the benches or in the storage box.

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Old 06-26-2017, 10:51 PM   #8
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Hydrogen gas smells like rotten eggs.

Health Concerns with Batteries - Battery University
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Old 06-26-2017, 10:53 PM   #9
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The space is "wasted" somewhere. Either under the benches or in the storage box.
Would rather have more ready access in the front storage box for stuff I use all the time.
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Old 06-26-2017, 11:09 PM   #10
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Hydrogen gas smells like rotten eggs.

Health Concerns with Batteries - Battery University
Well, sulphur does, not hydrogen. A sulfated battery that is off gassing exudes a mixture of sulphur and hydrogen, and sometimes yes, you can smell the sulphur. The carbon monoxide detectors have gone off in the middle of the night on several 21's due to even small amounts of hydrogen coming from an improperly sealed battery box - and this gas is not detectable by smell. That's one of the reasons why AGM batteries make sense in a 21.

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