Coast Resorts Open Roads Forum: aux. batteries won't charge with shore power
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 > aux. batteries won't charge with shore power

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Mikeborny

Cleveland

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Posted: 04/11/14 07:58pm Link  |  Quote  |  Print  |  Notify Moderator

I drained my aux. batteries and main battery last fall. The aux. batteries will charge after running the generator but not while connected to shore power. They actually drain completely after I connect to shore power.
I had a Ford dealer check the batteries and they replaced the main battery and said the aux. where ok. I had a full charge this morning, but after connecting to shore power, they are drained completely. Am I best replacing the batteries or is there another potential problem I am missing.

I have a 2011 Fleetwood storm 32bh. the Aux. are 2 6v batteries.


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camper19709

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Posted: 04/11/14 08:37pm Link  |  Quote  |  Print  |  Notify Moderator

hummmmmmmmmm......I had the same type of problem and it turned out to be a circuit breaker that had been tripped. The breaker was found hidden up in the corner of one of the outside storage bins. hope this helps


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rvten

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Posted: 04/11/14 09:05pm Link  |  Quote  |  Print  |  Notify Moderator

Do you have the battery disconnect switch on?
Usually by the entry door.


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Mikeborny

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Posted: 04/11/14 09:08pm Link  |  Quote  |  Print  |  Notify Moderator

Yes, when i shut off the aux. power switch while connected to shore power all the lights go out? I am a novice when it comes to this, but I thought the shore power would bypass the aux. batteries.

westend

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Posted: 04/12/14 06:37am Link  |  Quote  |  Print  |  Notify Moderator

Your lights are connected to the 12V system and your aux batteries and converter supply power when the switch is on. If you have the switch off, no power is available for your 12V system and the converter must be disengaged also.


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dougrainer

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Posted: 04/12/14 07:13am Link  |  Quote  |  Print  |  Notify Moderator

Mikeborny wrote:

Yes, when i shut off the aux. power switch while connected to shore power all the lights go out? I am a novice when it comes to this, but I thought the shore power would bypass the aux. batteries.


OK, you stated that when you run the APU (Generator) the Aux (call them Coach and call the Main chassis from now on), the Aux(coach) charge. But NOT on shore power. That does NOT make sense. The only difference between Shore and APU is WHICH is supplying 120 power to the RV, IF the APU supplies power to the RV and the Power Converter(the 12 volt charge appliance in your RV) is operating, then it will also on Shore Power. The APU does NOT charge anything. It has no charger, but supplies 120volts to the RV so your Charger (power Converter) does charge. Yes, you are missing something. Connected to Shore Power, (with bad or NO batteries) you will still have 12 volt power in the RV. How long did you run the APU to "charge" the batteries? It would take at least 6 hours or more to charge a dead or low battery bank, from the APU OR from Shore Power. Now, "some" RV's if connected to Shore Power (or APU), the "Aux Power Switch" (battery disconnect) if OFF, will still have 12 volt power to the RV(the power Converter), but the Battery disconnect will not allow 12 volt power to keep the Aux batteries charged and some OEM's connect the LP/Co detectors direct to the batteries and THAT load will drain the Aux batteries. A quick test to verify this is to unplug the Shore Power cord and IF the 12 volts goes dead in the RV, the Aux switch is indeed OFF. Doug

wa8yxm

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Posted: 04/12/14 07:18am Link  |  Quote  |  Print  |  Notify Moderator

On most motor homes the generator does NOT charge the batteries exactly.. It provides 120vac to the house systems and sub systems.. One of those sub systems is the converter, which is the device that charges the batteries.

on shore power, the very same converter charges the batteries

Possible issues: if a 30 amp rig.. I can not think of any as the converter will be on the 30 amp breaker on the generator same as the A/C and Microwave.

On a 50 amp rig.. If the Auto transfer switch is flakey and only transferring one leg to Shore (Welded contactor will do that) then it is possible the converter may not convert on shore power.

So, how does a contactor/solenoid/relay get welded? (3 names for one device).

Simply, hot switching. The proper way to transfer is to cold switch, to do this you start by TURNING OFF everything that is a big eater or... By disconnecting from shore power.. THEN you start the generator and about 1/2 to 1 1/2 minute later the box switches over, since there is no current flowing before the switch there is minimum arcing of the contacts at transfer.

With HOT switching (Fire up generator while shore power present) when it switches There is arcing both at break and make, and if there are any motors running (Air Conditioner for example) the inductive "kick" can make that one BIG arc.. Plus strange things happen at Make that increase the size of the arc as well.. The result,, Arc Welded Contacts. A very bad thing.


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ksg5000

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Posted: 04/12/14 10:48am Link  |  Quote  |  Print  |  Notify Moderator

Mikeborny wrote:

Yes, when i shut off the aux. power switch while connected to shore power all the lights go out? I am a novice when it comes to this, but I thought the shore power would bypass the aux. batteries.


Your battery disconnect switch "disconnects" your batteries from the 12v system which makes charging impossible. Toggle the switch and see if that resolves your problem.


Kevin

bob_nestor

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Posted: 04/12/14 10:53am Link  |  Quote  |  Print  |  Notify Moderator

Not saying this is the problem, but I had a similar experience with a motorcycle battery. It would charge up on one of my three chargers and appear to hold the charge, but as soon as I put any load on it the battery output would fall well below usable. Turned out to be a bad battery.

Mikeborny

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Posted: 04/14/14 06:13am Link  |  Quote  |  Print  |  Notify Moderator

Ok, I replaced the coach batteries on Saturday and brought home and plugged into my house. I have a 30 amp rig. I have nothing but the fridge running. This morning, I checked the aux. batteries and it has lost power again. It is now down to 4 lights out of 5 when I push the Aux. battery button.

What else should I be looking for that would drain the batteries?

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