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Old 08-29-2017, 03:56 PM   #1
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2009 22' Interstate
St. Paul , Minnesota
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Adding House Batteries

I am thinking of adding one or two additional house batteries so that we get more boondocking time between charges. Is there any reason this may be inadvisable? We already have two 12V AGM batteries.
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Old 08-29-2017, 05:30 PM   #2
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2017 30' Classic
Carlisle , Pennsylvania
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Hi

As far as you have explained your situation .... no problem.

Now for the details:

What model do you have?

Where do you plan to put them?

What will you give up to put them there?

The issue is *always* in the details.

Bob
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Old 08-29-2017, 07:30 PM   #3
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2009 22' Interstate
St. Paul , Minnesota
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Originally Posted by uncle_bob View Post
Hi

As far as you have explained your situation .... no problem.

Now for the details:

What model do you have?

Where do you plan to put them?

What will you give up to put them there?

The issue is *always* in the details.

Bob

We have a 2009 AI. I was planning to put them under the lounge/bed, which is adjacent to the battery box. Not really giving anything up, as we don't us that space for much. Yes, I am aware of the need for ventilation.
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Old 08-29-2017, 08:04 PM   #4
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Hi

Take a look at what they will weigh. That may or may not be an issue, but it's worth doing the math on. Since we are in the MH area, I'm assuming you are putting this into a Sprinter.

Bob
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Old 08-29-2017, 08:12 PM   #5
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2009 22' Interstate
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2009 Interstate, which is on a sprinter 3500 chassis
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Old 08-29-2017, 08:58 PM   #6
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Merritt Island , Florida
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New Lifelines

Long story short...I bought my AI in May from a dealer in Louisiana. When I got home I pulled the battery cover only to discover that he had stuck in two cheap Walmart batteries. Since I had to buy batteries anyway, I put in four Lifeline 6V GPL-4CTs for 440 AH (220 usable). I removed the old battery box and mounted the new ones in the rear storage compartment. I also installed a smart controller, Renogy Commander 20. Couldn't have done it without help from FlyFishinRVr.






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Old 08-29-2017, 10:04 PM   #7
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Quote:
Originally Posted by phaeton313 View Post
Long story short...I bought my AI in May from a dealer in Louisiana. When I got home I pulled the battery cover only to discover that he had stuck in two cheap Walmart batteries. Since I had to buy batteries anyway, I put in four Lifeline 6V GPL-4CTs for 440 AH (220 usable). I removed the old battery box and mounted the new ones in the rear storage compartment. I also installed a smart controller, Renogy Commander 20. Couldn't have done it without help from FlyFishinRVr.








Did you build that battery box yourself, and how long do your batteries last before needing recharging?
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Old 08-30-2017, 04:56 AM   #8
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Bethesda , Maryland
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If you have the EXT Interstate, that's a good way to go. Boxster added external racks underneath which is the way I would go if I needed extra batteries. We have the standard length Interstate and put two Lifeline 6CT's in the stock battery box which essentially doubled the Ah from the original 12V setup.
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Old 08-30-2017, 05:50 AM   #9
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Originally Posted by 3bcamper View Post
Did you build that battery box yourself, and how long do your batteries last before needing recharging?
No, it's the standard rear storage with EXTs. It was the exact size I needed for my 4 batteries.
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Old 08-30-2017, 06:52 AM   #10
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I like the underdeck storage for water hose, electric cord, and a myriad of other stuff. But I think I could learn to like it better as a place to keep four batteries.
Did you vent the box?
Did you reinforce the bottom of the box to support the 200+# of batteries?
Do you pull the batteries every winter? If so, it looks like the underside of the flip-up cover would be a good place to post a schematic of how they are wired in series/parallel.
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Old 08-30-2017, 08:53 AM   #11
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Signal Mountain , Tennessee
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I looked into adding batteries. I presently have 184 amp hrs of house bank capacity. That means 92 amp hrs usable. With running my appliances on propane, LED lighting, and a little conservation we can go 2 1/2 days and sometimes 3 before recharging. No matter what capacity you have the amp hrs will have to be restored by recharging. Solar is the ultimate answer, but I camp in wooded areas. It all depends on how long you want to run a generator to recharge. I decided against the weight of a couple of more batteries.
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Old 08-30-2017, 09:12 AM   #12
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Merritt Island , Florida
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Quote:
Originally Posted by Titus View Post
I like the underdeck storage for water hose, electric cord, and a myriad of other stuff. But I think I could learn to like it better as a place to keep four batteries.
Did you vent the box?
Did you reinforce the bottom of the box to support the 200+# of batteries?
Do you pull the batteries every winter? If so, it looks like the underside of the flip-up cover would be a good place to post a schematic of how they are wired in series/parallel.
Did you vent the box? - Yes, I drilled holes in several places. I also drill drain holes in the bottom in case water got into the box.

Did you reinforce the bottom of the box to support the 200+# of batteries? - Yes, I temporarily used motorcycle straps. I plan on fabricating a steel bar with side supports.

Do you pull the batteries every winter? - I'm not a battery expert, but I believe I read that you don't have to pull the AGMs as long as you keep a charge going to them. I live in FL so that's not an issues for me.

Page 43 of the Magnum manual is an excellent source of battery series/parallel information.
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Old 08-30-2017, 09:38 AM   #13
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Quote:
Originally Posted by ben322 View Post
If you have the EXT Interstate, that's a good way to go. Boxster added external racks underneath which is the way I would go if I needed extra batteries. We have the standard length Interstate and put two Lifeline 6CT's in the stock battery box which essentially doubled the Ah from the original 12V setup.
I looked at that option, but the 6CTs wouldn't fit in my stock battery box or in my storage box. How did you get the 6CTs in your stock battery box?
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Old 08-30-2017, 10:10 AM   #14
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Lake Oswego , Oregon
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Originally Posted by phaeton313 View Post
I looked at that option, but the 6CTs wouldn't fit in my stock battery box or in my storage box. How did you get the 6CTs in your stock battery box?
Chiming in here.... I put in the Lifeline GPL-4CT 6V thinking they would fit but instead the dealer cut my battery boxes in half down the middle and riveted in an expansion piece to make room for the extra width. I think they charged about $200-250.

Mark
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