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Old 01-29-2018, 08:44 AM   #1
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to maintain batteries while stored

Going to leave trailer on lot for 8 months. Will be connected to power and a dehumidifier running.

I have the original converter. My plan is to turn the battery switch to store and then connect a automatic trickle charger to the batteries to maintain charge.

Will this plan work okay? Will one trickle charger maintain both batteries?

thanks for any suggestions
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Old 02-01-2018, 05:42 PM   #2
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Should be fine.
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Old 02-01-2018, 06:59 PM   #3
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How many amps does the humidifier draw? You will need to have a charger that supplies an amp or two more.
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Old 03-26-2018, 12:50 PM   #4
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the humidifier will pull power from the 120 system not the 12 v i would guess to be true. the charger will not come into play. If you have a stock or OEM charger you might want to put it on a timer to come on for 30 mins every day and off the rest of the time. helps to keep the batteries from losing water over that time frame.


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Originally Posted by Mattirs View Post
How many amps does the humidifier draw? You will need to have a charger that supplies an amp or two more.
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Old 03-26-2018, 01:07 PM   #5
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I'd consider disconnecting the batteries, (by removing the black cables going inside), put the converter in "store" and a trickle charger across both batteries, one positive and the other battery's negative. Since the batteries are in parallel, they make a big 12 v. battery.
In theory the converter won't be supplying juice, but I'd probably tape over the loose cables anyway.
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Old 05-19-2018, 10:59 AM   #6
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Took the batteries out and put them in the shed. Bought 2 trickle chargers and put on on each battery.
But the golf cart batteries are just sitting there in the cart.
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Old 05-19-2018, 01:07 PM   #7
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I assume the dehumidifier will be connected to a drain to the outside or the gray water tank?
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Old 05-19-2018, 01:36 PM   #8
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Drain line is rigid piped to the sewer. Gray water valve is open. De-Humidifer is sitting on kitchen counter with hose draining into sink. Worked last 2 years this way.
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Old 05-19-2018, 02:33 PM   #9
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Great way to do it. Thanks for the good idea.
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Old 05-19-2018, 02:46 PM   #10
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Hi

Hitting the batteries forever and ever with a trickle charger is not going to kill them, but it also is not the greatest thing for them. A dirt cheap mechanical timer that fires up the charger(s) once a week for a couple hours would help things more than just a little. That of course *assumes* the particular chargers you have don't get stupid when the main power goes off. A quick check with a multimeter will show you if they pull current when unplugged from the wall, but still on the battery. Anything under 10 ma is a "don't care about it" sort of number in this case.

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Old 05-19-2018, 03:58 PM   #11
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Thanks Bob. Did not know that. Probably should have. The batteries will have to survive on their own until I get back to them in Jan. Usually I just unhook the grounds and let them sit. Thought I would be ahead with the trickle chargers since that is what they are advertised to do. I buy lots of batteries. That trailer is going to the the converter upgrade when I get there. But what I think you are saying is that the newer converters still harm the battery when sitting?

Lets see: 4 batteries in the trailers, 2 in the boat, 6 in the golf cart, 2 in my truck, and 1 in the Subaru. Plus I wear hearing aids and change twice a week. And not to forget the half dozen or so Lithium tool batteries. I spend a lot of my income on batteries. And I bet a lot of people have more batteries than I do. I do not seem to be able to maintain them well. Most of them sit somewhere most of the time. And when I use them I draw them down too far.
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Old 05-20-2018, 07:00 AM   #12
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Hi

All most of these gizmos do normally is put a constant voltage on a battery in storage. A few of them go into some rock and roll once a month or so. My only point is that there is no need / value in putting a constant voltage on 24 hours a day 7 days a week. Some of the same rock and roll can be accomplished by hitting them once a week. Is it a really big deal?
nope. Might it extend a battery by a season? maybe .... timers are cheap.

The bottom line is still that lead acid batteries last a lot less time than most people think they do. Use them in high discharge / deep discharge applications *and* combine that with a lot of "do noting" storage ..... not so great. Your car or truck battery lasts as long as it does because it does not get a deep discharge ever and it's cycled daily ( or at least weekly).

Some math:

Starter motor on the car pulls 180A. It turns over for 10 seconds. Start the car 6 times a day = 60 seconds = 1/60 hour. You have pulled 180/60 = 3 AH out of the battery all day.
Your 40AH car battery gets hit less than 10% that day.

If you have a parasitic load of 1A on your trailer ( you might not ...) your 200 AH AGM bank on the trailer dumps 24 AH per day. That's sitting doing absolutely nothing at all. Your trailer sees > 10% drain on a day in storage.

Bob
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