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Old 05-19-2017, 05:50 AM   #1
3 Rivet Member
2016 30' International
redondo beach , California
Join Date: Feb 2017
Posts: 104
Adding a Third AGM

Our trailer has two stock AGM batteries charged with a Boondocker 12/60 and two stock 80W solar panels.

Inside the trailer under a couch is an almost empty space except for an inverter laying loose on the floor. ( No screws, an Airstream custom installation. )

Of course there are some fat 12V cables going to the inverter.

Why can't I just add a third AGM battery there in that empty space? I've got the 12V there and it would just put a third battery in parallel with other two.

Randy and Beth
2015 F250 Titan 50 gallon tank
2016 International ProPride, EasyStart X2, Michelin 16", Boondocker12/60 two sided tape holds it all together
Nobody's perfect and I'm a perfect example
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Old 05-19-2017, 06:21 AM   #2
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2012 25' FB International
Trent Woods , North Carolina
Join Date: May 2013
Posts: 1,687
I don't know why not. Airstream does undersize all of their battery cables but you would be no worse off than you already are. Just beware that you will not get equal charging from your charger, but I doubt that results in the loss of many amp-hours. By the book, batteries should be replaced at the same time and a battery monitor is not going to tell what is going on with one of 3 batteries in parallel. Again, that may not be a significant issue.


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Old 05-22-2017, 05:49 PM   #3
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2007 30' Classic
Ayr , Ontario
Join Date: May 2012
Posts: 230
Go for it
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