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Old 01-27-2016, 08:26 AM   #31
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As others have correctly indicated, it all depends on your converter. Mine is a Progressive Dynamics 9200 series. When it detects that it hasn't supplied significant current after something like 30 hours, it will go into a trickle "storage mode" and drop its output to 13.2 volts(yes just like an aftermarket Battery Minder.) This will keep the battery charged but not evaporate water over long storage periods. It will, in addition run the output up to 14.4 volts for 15 minutes each day (actually every 21 hours) which will prevent the settling of the sulfuric acid to the bottom of the battery which reduces capacity and leads to irreversible sulfate crystals being formed on the lower part of the plates...all good stuff to do to maintain battery life!

If your converter doesn't support these features, you can get a separate Battery Minder that does that for around $30 to $150 BatteryMINDer 2012-OBD2 : 12Volt 2 Amp (12V 2A) Charger/Maintainer/Desulfator W/ OBD2 Connector (World Wide Usage) - VDC Electronics But you could also replace your converter with a newer one for around $150.00, depending on how much amperage you want, and get a manual boost control for rapid recharge when running a generator in the process.

In short, if you have a good converter...leave it plugged in as it is smarter than we are, will overcome any parasitic loads and apply desulfation pulses each and every day.
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Old 01-27-2016, 01:28 PM   #32
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I have a solar panel that can keep the batteries charged but I still like the idea of being able to disconnect the bats completely when not in use. I'm upgrading the disconnect switch soon because there are others I like much better than what came with the trailer that will allow multiple banks and have a positive feel about switching.

I like to fully charge the bats, disconnect them, then every month or so plug it in and let it charge for just a few hours to top off. I like this way because there is little time usage on the converter, little water loss, no parasitic losses or elec cords happening 24x7. A few days before heading out I plug in.

I don't live in cold country so I just leave the bats installed. This way appears to work just fine but I'd like to know what's recommended from converter and battery manufacturers.

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2003 Dodge Diesel CC 2WD 3:73 - 20mpg
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Old 01-27-2016, 02:35 PM   #33
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I am sitting in my recliner in Florida, 68 degrees and showers, looking at my disconnect switch down the hall. It is ON, and has been almost every day since new. This TT comes to Florida in November/December, goes in any number of roundabout routes back to Kentucky in April/May, staying plugged in all the time. If we are not on the road it is in the barn, plugged in. Like bob caldwell, I have never added water to a single cell in almost 3 years. I just checked it last Friday while replacing my propane regulator and all is well.
It always surprises me to see that all plates are generously covered with water. I have no explanation for that, but I am happy with the fact.
Travel safe
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Old 01-27-2016, 03:10 PM   #34
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Originally Posted by FordHauler View Post
I am sitting in my recliner in Florida, 68 degrees and showers, looking at my disconnect switch down the hall. It is ON, and has been almost every day since new. This TT comes to Florida in November/December, goes in any number of roundabout routes back to Kentucky in April/May, staying plugged in all the time. If we are not on the road it is in the barn, plugged in. Like bob caldwell, I have never added water to a single cell in almost 3 years. I just checked it last Friday while replacing my propane regulator and all is well.

It always surprises me to see that all plates are generously covered with water. I have no explanation for that, but I am happy with the fact.

Travel safe

Sounds good!! Ours is three months old and the other day I put a total of 2 Cups of distillers water into the two batteries. Each cell took between 10 and 50 cc. Not sure why they needed so much - nothing unusual going in except cold weather. Maybe they came low from the factory.

PS: a 10-20cc syringe is the bomb for carefully adding distilled water to each cell without spilling a drop.


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Old 01-30-2016, 03:34 PM   #35
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Please remind me on a Crusader 5th wheel, do I push in or pull out battery switch to disconnect?
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Old 01-30-2016, 03:35 PM   #36
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Send a message via Yahoo to bob caldwell
Turn a 12 volt light on

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Old 01-31-2016, 11:38 PM   #37
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Originally Posted by BobandMarsha View Post
Please remind me on a Crusader 5th wheel, do I push in or pull out battery switch to disconnect?
Most are push in to disconnect. That way you can accidentally hit it with your foot and turn the refer off. But as mentioned with shore power disconnected, turn on a light and push it in and out and that will confirm it.
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Old 01-31-2016, 11:54 PM   #38
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This is what the WFCO manual for my Rockwood says about charging and maintaining. It seems to do a pretty good job I'll find out when I start boondocking this summer.

1. NORMAL MODE (Absorption) powers all DC loads, and keeps the battery charged.

2. TRICKLE MODE (Float) is initiated when there is no significant change in current draw for 44 continuous hours, keeping the battery charged while prolonging its life.

3. FAST CHARGE MODE (Bulk) kicks in to charge the battery if itís significantly discharged due to improper maintenance, long term storage, or significantly heavy system overloads. Bulk mode is maintained for 4 hours (max.) to prevent possible battery damage.

Normal and Trickle Modes are the only charging modes your battery should ever require when you properly maintain your battery. The WFCO Normal Mode is a powerhouse, capable of charging a fully-discharged battery in under 3 hours. Trickle Mode will keep the battery safely charged when your RV is not in use.

Some RV and battery manufacturers believe high-voltage charging can potentially damage the battery if not absolutely required. The WFCO Fast Charge (Bulk) Mode is provided for the rare times a battery needs extra power for charging.

The key to long battery life is proper maintenance. Keep the battery terminals, top, and sides clean and free from corrosion, dirt, and grime. When the RV is not in use, keep it connected to a trickle charging source that will keep the battery safely charged, or disconnect the battery completely by removing all wiring connections from the battery terminal posts.
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