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Old 10-24-2013, 10:11 PM   #11
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Did you ask the shop to keep it plugged in to maintain your batteries? When the time comes, I'll make it a habit of asking for this in return for my business.
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Old 10-25-2013, 09:54 PM   #12
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Originally Posted by garbonz View Post
They may be happily charging, but have liked suffered significant damage. I would not depend on them to supply much off grid power, but they may be ok for short trips. Not sure about the refrigerator inverter thing but that may be problematical also without an alternator keeping thing charged up.
Been thru this before myself.... If your batts were that dead, they may be permanently ruined. For your sake, I hope I'm wrong.

I've heard that they could actually become charged with pos/neg terminals reversed.

I had the opposite problem... Batts were being so badly overcharged they are pretty much ruined.

Boowho??
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Old 10-28-2013, 08:34 AM   #13
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I have a question about maintenance free batteries. We replaced the old batteries and we leave our 2013 Berk plugged in and the A/C on to keep humidity out and a consistent temp here in Florida. It is 46 this morning going to almost 80. Quite a temp spread. Does leaving the rig plugged in hurt/help the batteries? Thanks Frank
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Old 10-28-2013, 10:18 AM   #14
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I have wondered the same but found leaving it plugged in all the time (as I do as well) kept boiling off the old flooded batteries. I even put in the upgraded Magnum control panel and dialed back the charging rate but they still kept boiling and were pretty much ruined.
Now I have the maintenance free AGM type batteries and AGM (Absorbed Glass Mat technology) batteries are supposed to handle a fast charging rate anyway. The upgraded Magnum contol panel also lets you select battery type and can be set for AGM 1 or AGM 2 although I havent figured out the difference yet as I just got them. The factory set the panel for battery type "Gel" although this may have been by mistake. Until I find out how it should really be set I havent worried too much since the setting for gel batteries is a slow charging rate and figured it hasnt been hurting them. I will find out and post again.
I would say the upgraded Magnum control panel is probably a must for anyone who leaves their coach plugged in and just need to figure out the best settings for charging and prolonging battery life. I do feel good about the investment in AGM batteries though - they are very expensive but have read several articles and testimonials about how they are worth it.
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Old 10-28-2013, 11:19 AM   #15
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I have a question about maintenance free batteries. We replaced the old batteries and we leave our 2013 Berk plugged in and the A/C on to keep humidity out and a consistent temp here in Florida. It is 46 this morning going to almost 80. Quite a temp spread. Does leaving the rig plugged in hurt/help the batteries? Thanks Frank
You don't have a choice with this kind of operation, and whether it is good or bad depends on the quality of your charger and what it is set on. One idea would be to get a good external charger and operate that to keep the batteries up, rather than the converter in the camper itself. you can shut off the breaker for the converter.
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