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Old 12-15-2013, 09:39 PM   #15
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A quick, short term fix would be to use a timer on your supply wire. When my old single stage charger went berserk, I used a timer to maintain my batteries allowing for 4 hours of charging and then it was off for the next 24 hrs. This worked until I had time to do the R&R of the old converter.
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Old 12-15-2013, 09:46 PM   #16
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Comments;

1- Determine the type of battery(s) being charged.
2- Determine the charging profile required by your battery type.
3- Determine if your charger provides the correct charging profile.
4- What type of camping do you do? Dry, boondocking or always plugged into to 120VAC at the campground?
5- If necessary, select a new charger to provide the correct charging profile for your battery bank and to suit your RVing style and electrical load.
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Old 12-16-2013, 07:45 AM   #17
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Standard wet cell 12 volt, single battery
How do I determine Profile
AT 14.2 volts day in day out while just sitting there can't be correct
We really don't camp. Use it to haul family/s in comfort on long trips.
Want to find charger that will keep battery up, no harm, as I leave MH hooked up to power all the time to run dehumidifier. Thanks
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Old 12-16-2013, 08:16 AM   #18
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Quote:
Originally Posted by clyon51 View Post
If your charger is original, it's most likely a single stage. The output on these are in the 13.6v range and should not fluctuate.

When driving, your alternator will pump 14.0 to 14.6v to the house batts. So this voltage does not hurt them. What it does do however is 'boil' them, so you need to monitor water levels closely, just as you would need to do with a single stage plugged in 24/7.

Your average smart charger will put out 14.3v in Boost Mode until the batts reach 90% charged. Then will drop back to Normal Mode, 13.6v to fully charge. Then to Float 13.2v to maintain them. My PD9200 Series has an additional Desulf mode, which periodically runs itself in Boost Mode about 20 mins per day. This prevents or rids the batteries of any sulfation of the plates extending battery life.

If you discover you have an old single stage, I would recommend a Progressive Dynamics 9200 Series.
X2 on clyon51's note.
Keep you eye on the battery water level until you get it fixed. 14V will boil off the water in the battery.
I didn't notice how old the batteries were, but at 6 or 7 years they may not be able to maintain fully charge thus the charger would always pump in 13.6 to 14V trying to get them charged. Also, one weak battery will do this as well (no matter the age). Maybe disconnect all but the best battery and see how it works.
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Old 12-23-2013, 04:33 PM   #19
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Here is a typical 6 VDC FLA deep cycle battery used in motor homes. I have 4 of these in series/parallel for my house batteries.

http://www.usbattery.com/usb_images/...heet_2013e.pdf

Note the charging profile. Remember, this is for one 6 VDC battery. For a 12 VDC setup, double the values.
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Old 12-24-2013, 04:21 PM   #20
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There is but one 12 volt house battery in this coach. We put two six volts in series to get more service on the boat, but those six volt golf cart batteries won't fit in the camper house battery compartment.
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