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Old 09-03-2015, 11:04 AM   #1
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battery over charging on shore power

I have a 2014 3170ds with two batteries and when on shore power the front one get very hot and boils the water out. what controls the charge rate ?
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Old 09-03-2015, 11:11 AM   #2
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Converter controls charge on shore power. However, your issue sounds very similar to the battery problem noted in this thread:
Coach Batteries Are Very Hot!
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Old 09-03-2015, 11:13 AM   #3
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Sounds like a bad battery.
Replace them in pairs.

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Old 09-03-2015, 11:23 AM   #4
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The charge controller / converter takes care of charging the batteries, many better quality c/c's are programmable for the battery type: Flooded, AGM, Gel.
If you find you have a problem with one battery being overcharged,
1. unplug the trailer from shore power,
2. let the batteries cool down,
3. check both batteries are identical
4. check battery voltage with Voltmeter

When working with batteries there are a few rules:
1. wear acid resistant gloves and safety glasses when handling questionable batteries
2. Never tip batteries over, unless they are sealed AGM type batteries
3. When connecting batteries start with positive cable then negative, when disconnecting negative first positive second.

Do get to your main question, it is very possible that the battery that's boiling is just defective and needs to be replaced. A fully charged battery should have 12.6 - 12.9 Volt when left disconnected for about 30 minutes to an hour, if it is less you have a brick.
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Old 09-03-2015, 12:58 PM   #5
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since you say it boils the water out are you replacing the water with distilled H2O?
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Old 09-03-2015, 01:25 PM   #6
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The same thing happened on my last 5er. One of the 2 batteries would boil over. At first I thought it was one bad battery. But after calling WFCO I figured out that the converter was bad. It was putting out 14.8v. It was just enough to boil the first battery and not the second. I replaced it with a BoonDocker.
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Old 09-03-2015, 01:26 PM   #7
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My problem with the same symptom was bad battery. As earlier stated replace both or the new one will be damaged and you will end up replacing 3 instead of two. IMHO. Yes this I the voice of experience talking.
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Old 09-03-2015, 01:42 PM   #8
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X2 on Turbs. Sounds like a short in the first batt. Compare voltages when you have them both out of the coach...to rule out a converter issue,..hook up the good battery and plug in. Voltage should be between 13.1 and 14.5. Anything else means either you don't have a good battery #2 either....or a converter issue
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Old 09-03-2015, 03:27 PM   #9
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Cypress loser great info thx
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Old 09-05-2015, 12:42 PM   #10
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relaced both of them hope it clear up the problem. Converter only putting out 13.5 volts
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