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Old 09-27-2016, 10:56 PM   #1
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I need some battery education....

Mechanically, I'm always good to go, electrically, not so much. I want to add an additional battery to my camper. It has a deep cycle marine battery now (in a vented battery box). Can I replace it with an AGM and delete the battery box and add another AGM in parallel. I have room for another in a location about 3 feet from the original battery.

I sleep on a CPAP machine at night (running through a xantrex PSW inverter.) It's running on one group 24 battery now and lasts all night but I feel 2 would be better.

I recharge with an inverter genny everyday for 2 hours. Solar don't work, I camp in the woods all the time...

My big question is, does an AGM battery have to be vented to the outside and if so, what type of battery don't have to outside vent? Would be very hard to vent the second battery...

Or should I just upgrade the 24 to a 31?
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Old 09-27-2016, 11:11 PM   #2
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An AGM battery does not need to be vented. You should have no problems with running the two new AGM batteries in parallel. IMO a bigger battery is always preferable to a smaller one.
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Old 09-27-2016, 11:16 PM   #3
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Originally Posted by clr View Post
An AGM battery does not need to be vented. You should have no problems with running the two new AGM batteries in parallel. IMO a bigger battery is always preferable to a smaller one.
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Old 09-28-2016, 12:00 AM   #4
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For a good 12v system education, Google "The 12 Volt Side of Life".
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Old 09-28-2016, 01:21 AM   #5
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Take the advice from "The 12 Volt Side Of Life" with a grain of salt. There are some statements made that are a bit far from accurate.
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Old 09-28-2016, 05:51 AM   #6
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If you are going going to run the batteries in parallel you will want to buy two new batteries so they are the same.
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Old 09-28-2016, 06:20 AM   #7
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Yes you can use AGM batteries without worrying about venting. As some of the other posts indicate, you need to install them in parallel, but when you do that it is best that both batteries be exactly the same model and age and the cable lengths to both should be identical. That is because in parallel it doesn't take a lot of difference for one battery to get the lion's share of the load and the recharge current. While this isn't totally the end of the world, the loaded and more used one will wear out much faster under those circumstances.
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Old 09-28-2016, 06:58 AM   #8
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I'm all for the extra battery. It's the first mod I make to every camper I have owned. Have you considered running directly off the battery? Inverters are only about 80% efficient. I also use a CPAP but with the 12v adaptor. I installed a 12v socket close to the night stand. We often stay off the grid too and used the generator to charge up the batteries.
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Old 09-28-2016, 07:26 AM   #9
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Yes 2 new batteries; the connecting wires between the batteries as large in diameter as available, exactly the same length, and as short as will fit; wire exactly as indicated for equal charge and discharge cycles.

Positive from camper on one battery and negative from camper on the other one.
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Old 09-28-2016, 07:37 AM   #10
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Quote:
Originally Posted by SidecarFlip View Post
Mechanically, I'm always good to go, electrically, not so much. I want to add an additional battery to my camper. It has a deep cycle marine battery now (in a vented battery box). Can I replace it with an AGM and delete the battery box and add another AGM in parallel. I have room for another in a location about 3 feet from the original battery.

I sleep on a CPAP machine at night (running through a xantrex PSW inverter.) It's running on one group 24 battery now and lasts all night but I feel 2 would be better.

I recharge with an inverter genny everyday for 2 hours. Solar don't work, I camp in the woods all the time...

My big question is, does an AGM battery have to be vented to the outside and if so, what type of battery don't have to outside vent? Would be very hard to vent the second battery...

Or should I just upgrade the 24 to a 31?
Here ya go.
The 12volt Side of Life (Part 1)
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