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Old 06-06-2016, 07:52 PM   #1
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Battery/converter

I have a 2012 Salem Forester 26Tbud. Last summer when we were camping and had Full hookups at 30amp sites, we bought a new RV battery and our A/C would be running and then we would have no power after about 4 hours of it running. We would have to recharge the battery before anything would come back on. Our question is Why is the battery draining so fast and why wouldn't it run off the electricity poll at our campsite instead of the battery?
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Old 06-06-2016, 08:06 PM   #2
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Sounds like converter is not working properly. You should use a voltmeter and check to see what the output is.

You still need to use battery for all of lights and other things that use 12V electricity. Your converter, being on shore power should keep battery charged.

When battery has full charge and not connected to shore power do the 12V items work? If not, that could be a battery disconnect switch.
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Old 06-06-2016, 08:13 PM   #3
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Originally Posted by Glamping4fun View Post
I have a 2012 Salem Forester 26Tbud. Last summer when we were camping and had Full hookups at 30amp sites, we bought a new RV battery and our A/C would be running and then we would have no power after about 4 hours of it running. We would have to recharge the battery before anything would come back on. Our question is Why is the battery draining so fast and why wouldn't it run off the electricity poll at our campsite instead of the battery?
What did you do to charge the battery? The thermostat and much of the AC unit needs 12 volt to run. If your converter wasn't charging the battery then it would run down and you would have to re-charge it...if the converter was running it would have been supplying 12 v from shore power and it wouldn't even matter if there was a battery at all.
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Old 06-06-2016, 08:15 PM   #4
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Check the two large fuses ( 30-40A) in the converter. If you try to charge a very low battery these can blow and the converter will not supply 12V to the battery or trailer appliances. You will run totally on battery and deplete the battery rapidly as you are seeing.
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Old 06-06-2016, 08:16 PM   #5
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So we would hook the Voltmeter to the converter and what should it read if it is good? What is shore power?
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Old 06-06-2016, 08:18 PM   #6
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We used a mobile battery charger and as soon as we charged the battery back up then everything worked But would drain the battery.
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Old 06-06-2016, 08:18 PM   #7
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When you are connected to shore power ( Power pedestal) the battery voltage at the terminals should be about 13.8V or higher. I not the converter is not charging the battery.
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Old 06-06-2016, 08:23 PM   #8
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So we would hook the Voltmeter to the converter and what should it read if it is good? What is shore power?
Shore power is campground power or any power you plug your RV into. You should see at least 12V DC on the output side. Make real sure you do not measure 120V AC input side.
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Old 06-06-2016, 08:27 PM   #9
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We checked the 30-40 Amp fuses and they are not blown.
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Old 06-06-2016, 08:33 PM   #10
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When plugged into campground power what is voltage at battery terminals. Do you have a battery cut off switch?
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