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Old 07-10-2016, 08:23 PM   #1
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110v Not charging House Batteries

We have a power problem: Shore power is not recharging the house battery.
We're hooked up to 110v. The microwave light is on and works.
The 12v house batteries are run down (our daughter-in-law ran it down while dry camping). The batteries show 3 v each.
Even when plugged into 110 at home, there is no 12v power and it is not charging the house batteries.


We're opened up everything we can get at. Can't tell if any fuses/breakers are tripped. We can't trace all of the wiring. Much/most is behind walls, so can't locate the inverter. Manuals supplied by FR are not helpful.

More background:

The unit was used dry camping for about three days when she ran out of electricity. She ran the generator ...perhaps for an hour before it quit. She had some power for perhaps a day but it all went dead again (not unexpected). She had to turn the engine on to start the generator. She ran it once more. It quit after perhaps 20 minutes, but it didn't give her more power. (She was running the fridge on propane so was okay.)

At the end of the week, to get the slides in she was able to run a long extension cord to an outlet and was able to get enough power to get the stabilizers up and bring in the slides.

She had some issues driving home and took the rig to the Mercedes dealer. We think those issues were unrelated...not 100% sure...but they did some warranty covered work.

We picked it up and brought it home. At that time we noticed the radio/navigation unit wouldn't turn on. Also realized we had no lights.

At home we plugged it in. It's been plugged in for 24 hours. See paragraph 1 for current status.

This is a 2014 Solera.

Any advice?
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Old 07-10-2016, 08:38 PM   #2
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There are two high current fuses in the converter (30-40A). If they are blown the battery will not charge and the 12V side of the RV will not work. If the battery is down to 3V when you plugged it in, the converter tried to charge at full current and probably blew those fuses.
You will need to charge the battery with an external auto charger as replacing the fuses will most likely just cause them to blow again. Once you get the issue resolved, take the batteries to an auto parts store for a load test. Draining batteries that low usually renders them virtually useless. They will charge, but not support a load.

The control board for the fridge runs on 12V. You need to have 12V even to run on propane.
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Old 07-10-2016, 08:50 PM   #3
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Flip all the circuit breakers off, then back on (while plugged in to shore power). Our 2012 Solera will occasionally pop the breaker that operates the converter - resulting in no charge of the house batteries while plugged in or on generator power.
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Old 07-10-2016, 08:59 PM   #4
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Your converter is under the bottom left kitchen drawer, take drawer out to inspect connections, and fuses. There have been several strings discussing loose crimps on battery wires on our units. Slides and radio work off house batts so they are all related to the failure to charge. There is/are fuses and resettable breakers in the battery isolator box on side of steps. Good luck
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Old 07-10-2016, 09:18 PM   #5
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Quote:
Originally Posted by JLeising View Post
Flip all the circuit breakers off, then back on (while plugged in to shore power). Our 2012 Solera will occasionally pop the breaker that operates the converter - resulting in no charge of the house batteries while plugged in or on generator power.
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Old 07-10-2016, 10:07 PM   #6
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Sorry, but this hasn't been brought up yet...

Is the battery cutoff turned on? I'm only asking this because I had a similar problem the day after I brought my trailer home. Been there, done that...
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Old 07-10-2016, 10:45 PM   #7
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thank you

Thank you all.

Will follow up in the morning with these excellent advice and suggestions.

And, yes, the first thing checked was the battery on/off switch.

Will post results.

Gary and Linda
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Old 07-12-2016, 12:44 AM   #8
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Quote:
Originally Posted by PNWTraveler View Post
Thank you all.

Will follow up in the morning with these excellent advice and suggestions.

And, yes, the first thing checked was the battery on/off switch.

Will post results.

Gary and Linda
I think the batteries are damaged and toast in any event.
When you attempt to charge...use a voltmeter at the battery TERMINALS to test to see if a charge is being deliverd while plugged in. Should read over 13 volts at the terminals. If you read less...the converter is either broken, blown fuses or not connected properly. Good luck!
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Old 08-10-2016, 12:48 PM   #9
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Spot on

Quote:
Originally Posted by Flybob View Post
There are two high current fuses in the converter (30-40A). If they are blown the battery will not charge and the 12V side of the RV will not work. If the battery is down to 3V when you plugged it in, the converter tried to charge at full current and probably blew those fuses.
You will need to charge the battery with an external auto charger as replacing the fuses will most likely just cause them to blow again. Once you get the issue resolved, take the batteries to an auto parts store for a load test. Draining batteries that low usually renders them virtually useless. They will charge, but not support a load.

The control board for the fridge runs on 12V. You need to have 12V even to run on propane.
You were spot on. There were two fuses blown. The batteries were taken in and load tested. They are not toast. They are fine. Replaced the two fuses, recharged and we were back in business.

Grateful to this community for the quick and thoughtful responses.

Gary and Linda
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Old 08-10-2016, 01:08 PM   #10
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Normally those fuses blow when you hook the battery up backwards


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