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Old 01-05-2015, 06:25 PM   #1
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Winter storage battery charging.

If I keep shore power and battery charger on continuously, can I overcharge batteries?
My 25FB International is nicely tucked in to enclosed warehouse, all winterizing done as recommended.


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Old 01-05-2015, 06:38 PM   #2
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If I keep shore power and battery charger on continuously, can I overcharge batteries?
My 25FB International is nicely tucked in to enclosed warehouse, all winterizing done as recommended.


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If you have the stock converter.....DEFINITELY!!! Just a short matter of time before you totally cook your Interstate flooded cells. There are many existing threads that will detail exactly why this is happening.

I would replace that old battery burner with a 'smart' fully automatic 3-stage converter, like the PD-4655 from Progressive Dynamics (made in USA!!!). It is a direct replacement for your Parallax single stage constant voltage unit, and will keep your new batteries (your existing ones are probably past the point of no return) in fine form, especially when connected to shore power for long periods of time. Just plug in and fugeddaboutit!
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Old 01-05-2015, 06:41 PM   #3
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Will the PD 9245 function in the same way?
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Old 01-05-2015, 06:45 PM   #4
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Just disconnect the negative (ground) on the batteries once they are fully charged. Don't hook up shore power again until you reconnect ground.
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Old 01-05-2015, 08:11 PM   #5
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Will the PD 9245 function in the same way?
Yes, the 46xx series is the one which fits right in the existing Paralax box and has a new fuse panel provided.

The 92xx series is a more free standing converter/charger which is suitable for replacing the gray box Univolt in the older trailers.


The xx in the above numbers is the amp rating of the unit. Usually a 45 to 55 amp is what most use.

I find that 45 amps is fine for virtually all use today, even though the original Paralax in my 2014 FC 20' is a 55 amp.
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Old 01-05-2015, 08:21 PM   #6
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Any multi-stage unit and you are good to go. PD4600 series for the 7355 or the Boondocker deck mounts or the PD9200s, Iota DLS, etc for the old Univolts or Parallax 7400 series. Just not a single stage Parallax and they all are. For those with 50 amp service (Parallax 555 or 5355), a deck mount can be used to convert it to multi-stage.
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Old 01-06-2015, 12:00 PM   #7
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I pull my batteries and put them on a battery minder for the winter.
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Old 01-06-2015, 12:15 PM   #8
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Second the recommendation of bestconverter.com. A skilled (and limber) doityourselver can change the converter charger in about 2 hours. Cost for the converter is about $250 and it will at least double the life of your batteries.
Meanwhile unplug your trailer from shore power until you get the converter changed.
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Old 01-06-2015, 01:01 PM   #9
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You can charge your batteries with a tender for the winter. Consider upgrading to a smart converter/charger, as others have suggested, in the spring.
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Old 01-06-2015, 02:05 PM   #10
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Originally Posted by lewster View Post
I would replace that old battery burner with a 'smart' fully automatic 3-stage converter, like the PD-4655 from Progressive Dynamics (made in USA!!!). It is a direct replacement for your Parallax single stage constant voltage unit, and will keep your new batteries (your existing ones are probably past the point of no return) in fine form
Lew or others, would you recommend installing a new battery monitor at the same time? Something more accurate than the standard Airstream panel?

I'm also wondering if we install solar in the future if the PD4655 (or other 3-stage converter) will still be of use.

Thanks,

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Old 01-06-2015, 02:34 PM   #11
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Lew or others, would you recommend installing a new battery monitor at the same time? Something more accurate than the standard Airstream panel?

I'm also wondering if we install solar in the future if the PD4655 (or other 3-stage converter) will still be of use.

Thanks,

Climber
You'll always use the converter (PD4655 or other 3 stage unit) for running the trailer's 12 volt system (lights, fridge, furnace, water pump, etc), and for charging the batteries from shore power.

When you install your solar system, the solar system will have its own standalone smart charger for the batteries. Normally a battery monitor will be installed at the same time as the solar system, allowing you to see the battery charge status, and to monitor all the amps going into (from all sources) and out of the battery bank.
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Old 01-06-2015, 02:42 PM   #12
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If you install solar, the solar monitor gives you more and better information about the state of charge than the stock AS battery monitor. There is no reason to disable the stock AS battery monitor when you install solar.
If you don't install solar, you will have to rely on the stock monitor as the three stage converter charger has no user display.
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Old 01-07-2015, 06:44 AM   #13
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Re: winter battery storage

Ive always pulled my original interstate batteries and on a monthly basis charged ea. overnight, or 24 hrs. w a Schumacher 10 amp automatic/ manual charger. Now, I am reading I "need" something called a battery minder. Am I doing something wrong? Thanks
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Old 01-07-2015, 09:09 AM   #14
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Have you tested each cell with a hydrometer? That will tell if each cell is in good shape. I pulled my two Interstate batteries and found two cells in one battery where the specific gravity was too low yet the battery showed 12.8v resting. I hooked up an old charger and ran it up to 15.5v for a couple of hours. I was able to restore the two cell's specific gravity. The batteries are only two years old. This was the first time I pulled them and tested for specific gravity.

My interstanding is Interstates are not true deep cycle but a hybrid. My next set of batteries will be a true deep cycle. Not sure if they will be AGMs yet.

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