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Old 05-18-2016, 07:21 PM   #1
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2010 22' Interstate
Albuquerque , New Mexico
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Tripp Lite Inverter/Charger

Hey all, I'm new to the group but have read many of the posts on the site and found them to be very helpful. I have a 2010 Airstream Interstate and have been using it for about 2 years. I have recently had a problem with both the AGM Lifeline batteries not holding a charge and they appear to have ballooned out on the sides of the battery case. The batteries are just under 2 years old and Lifeline was nice enough to give me a prorated deal for two new batteries. I am unclear if my charging Tripp Lite Inverter/Charger was to blame for their early demise or if they were faulty batteries. Is there a way to test the the charger to see if it is overcharging the batteries? I am hesitant to reinstall the new batteries if a problem exists with my charging unit. Thanks for the input.
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Old 05-18-2016, 07:32 PM   #2
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Welcome to the AirForums.

You might check the DIP switch settings. I was informed that Airstream recommended the following: A1-UP, A2-DOWN, A3-UP, A4-DOWN, B1-DOWN, B2-DOWN, B3-UP, B4-UP.

This was different from what they originally told me earlier.
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Old 05-18-2016, 10:12 PM   #3
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The Tripplite charger if left plugged in will overcharge the house batteries, and that is what likely happened. I used to have the same model in a Roadtrek, and it routinely boiled the water out right of the wet cell batteries.

I highly recommend replacing it with the Magnum unit they currently use. Or don't leave the charger on for very long, at the very least. Those AGM's are expensive. My 2011 still has the original AGM's and they are fine-but I replaced the Triplite with the Magnum a few years ago and was careful not to overcharge them before I did the swap.
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Old 05-18-2016, 10:36 PM   #4
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Thanks for the speedy reply. I think I did cook them as I left the unit plugged in for over a month with minimal use. Which Magnum charge controller/inverter would you recommend?
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Old 05-19-2016, 07:44 AM   #5
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Bethesda , Maryland
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The Magnum MMS1012 is an easy replacement and is standard on the newer AS Interstates. You should also add the RC50 along with the replacement of the stock undersized wiring. Lew is a great resource and helped me through the replacement so now I can leave it plugged in 24/7 without worrying about the batteries.
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Old 05-19-2016, 09:55 AM   #6
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Great. Thanks for all the information. Will look into replacing the Tripplite with the Magnum MMS1012.
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