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Old 05-19-2017, 05:50 AM   #1
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2016 30' International
redondo beach , California
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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.
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Old 05-19-2017, 06:21 AM   #2
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Trent Woods , North Carolina
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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.

Larry
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Old 05-22-2017, 05:49 PM   #3
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Go for it
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