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Old 06-26-2017, 03:29 PM   #1
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Shore power is draining my coach batteries

When I plug in at a campground (50 or 30A) everything works for awhile and then the coach batteries go below 8v and everything shuts down. if I start the engine the batteries recharge and everything is good for a few hours until I have to repeat the process.
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Old 06-26-2017, 03:36 PM   #2
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Welcome to iRV2.

Shore power isn't draining your batteries; the system that should use shore power to charge your batteries and provide 12 volts to your RVs systems , isn't working.
This can be a converter/charger , or an inverter/converter/charger, depending on your RV .

To be of any more help , we need you to add all the info you have on your coach to your post.
We're not standing beside you , you have to tell us everything.
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Old 06-26-2017, 03:50 PM   #3
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Maybe the transfer switch is not engaging and you
are running all battery until they die.
Do you hear a loud click when you throw the
breaker after you have plugged in ??
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Old 06-26-2017, 04:10 PM   #4
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Yup, battery charger is not doing it's thing. To verify: Without any charging active (engine and genny off, shore cord disconnected) read the battery voltage. Now plug in shore power - the voltage at the battery should go up about 1 volt. If not, no charging.
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Old 06-27-2017, 02:42 PM   #5
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Thanks everyone. I have a 2007 Southwind 32. The cord does work as the AC works until the batteries go below 8V. Why do I need the batteries when plugged in to the 50A? While out last week I turned off the batteries while plugged in and everything went off except the TV ???
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Old 06-27-2017, 02:45 PM   #6
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Thanks Vince, I will try that, where is the charger?
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Old 06-27-2017, 02:49 PM   #7
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12v only comes from the chassis or house batteries. 120v runs a charger to top off the house batteries when plugged in, and sometimes the chassis batteries too. 12v house power runs the brains of your fridge when in 120v or propane. 12v house power runs your thermostat always, your lights always, your furnace fan always, the brains of your water heater always, your dash radio always (tho' sometimes off the chassis battery), and a lot of other stuff is 12v even when plugged into 120v. So, without the charger topping off the batteries, they will go dead always.
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Old 06-27-2017, 03:04 PM   #8
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Got is and thanks, so I should probably have the charger looked at prior to the converter?
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Old 06-27-2017, 10:29 PM   #9
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Quote:
Originally Posted by Leexlt View Post
Got is and thanks, so I should probably have the charger looked at prior to the converter?

The charger is in the same housing as the converter , ( Converter/charger ).
If your coach was originally equipped with an inverter , there is a good chance it will all be in the same package . ( Inverter / converter/ charger )
In order to work when there is no 120 volt supplied , your fridge, furnace , and through the wall thermostat your roof air conditioner all require good 12 volt to continue operating.

More info here.

The 12volt Side of Life (Part 1)
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Old 06-28-2017, 09:12 AM   #10
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Thank you, I can see the complete system, it just looks confusing and expensive.
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Old 06-28-2017, 09:16 AM   #11
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looks confusing and expensive

Don't worry.......... IT IS
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