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Old 06-29-2017, 10:37 AM   #1
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2015 27' Flying Cloud
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Batteries are boiling

I have a 2015 flying Cloud, and we are on our 2nd set of batteries. They are boiling, and we suspect it is the Parallax Converter. The Airstream Service Dept is not interested in trouble shooting, rather they just want to replace the batteries again, and upgrade the converter without verifying the root cause of the over-charging of the batteries. We have an appointment with a servicer recommended by Parallax (not for a couple of weeks). Anyone else had a similar issue, and any ideas how we can get to the bottom of this?
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Old 06-29-2017, 11:00 AM   #2
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I'm not sure of the timeframe you are speaking of. Are they boiling when you are using the trailer or are they boiling when you have the trailer home and are not using it?

Unless I know otherwise, if you have a single stage charger/converter like most of us have, prolonged plug in time to your home power when the trailer is stored can boil the batteries. I've done it early in my ownership and I've learned to not keep my trailer plugged in while home and not in use.

On the road and while camping using campground power I've not had this problem. I assume that this isn't occurring due to 12 volt appliances and lights being used.

Assuming that the charger/converter is working within specs and it is a single stage unit, your only answer is to not leave the trailer constantly plugged into power when it is not being used, or consider replacing the charger/converter with a multi-staged smart unit. Those units will throttle down the charger to a trickle charge only that will maintain the battery once the battery reaches full charge, but will not boil it.

Jack
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Old 06-29-2017, 11:30 AM   #3
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We do not keep it plugged in at home other than overnight before leaving on a trip. The latest incident were brand new, sealed batteries. Within 4 hours of being plugged in to shore power, they were boiling. I had them in the "use" position at the time, then switched to "store" after the 4 hours and they cooled down.
Any idea why they are boiling, and so quickly?
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Old 06-29-2017, 11:35 AM   #4
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Can you measure the voltage directly across the battery terminals with a DVM while in the "Use" position and connected to shore power?
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Old 06-29-2017, 11:56 AM   #5
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Quote:
Originally Posted by dscarlson View Post
. . .
The latest incident were brand new, sealed batteries.
. . .
So you upgraded to AGM sealed batteries? Are you sure your converter is correct for these batteries? My lay opinion is that your converter is not functioning correctly.

Good luck!

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Old 06-29-2017, 12:33 PM   #6
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Are these lead acid batteries or some other type? Some styles of batteries may have issues with standard single stage chargers. I definitely would try to get a meter on your battery cables and see what kind of amperage you are seeing coming from that charger/converter.

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Old 06-29-2017, 12:36 PM   #7
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Keep our AS on AC power all the time.. no issue... but we don't have stock converter...
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