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Old 06-10-2021, 09:05 AM   #1
Jason687
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Battery Charging from shore power

Have recently acquired a 2011 Montana 3150RL. No solar on rig. Need to replace a dead battery. First thought is to understand the charging system when connected to shore power. From the factory, did this rig use a multi stage charger that includes trickle charging once a full charge is reached, or will I burn out the battery if I leave shore power connected during winter storage?



Are there any useful after market upgrades other owners have made to the charging system to improve effectiveness?


Thanks in advance for comments/help in understanding.
 
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Old 06-10-2021, 10:16 AM   #2
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Your unit's converter should have multi-stage charging and would not overcharge and damage battery provided the factory converter has not been replaced with an inferior one. We full-timed for 10 years always plugged in and never a problem with our 2008, 2012, and 2018 Montanas.
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Old 06-10-2021, 01:23 PM   #3
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Same for us. Fulltime for 12 years now and always plugged in.
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Old 06-10-2021, 02:24 PM   #4
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Jason- How many batteries do you have in your unit? If you have more than one you should change out all of the batteries instead of just the single bad one. If you only have one battery you will be fine but I suggest you think about putting in at least two batteriesl A unit can chew up a single battery with no problem at all. If you have two batteries and replace only one of them, the new battery will loose power or charge because the older battery will bleed power from the new battery to equallize the power each have.
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Old 06-13-2021, 10:19 AM   #5
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Thanks for all the helpful advice. Some further info...
My rig came with a single group 24 deep cycle marine battery. Looks like the box could accommodate a group 27. I'm considering replacing with a UB1210000 AGM 12V battery (or possibly two of them).

I did install two 6V batteries in our last 5th wheel (and upgraded the charger to a 4 stage smart charger) but, over 17 years we have not actually boondocked... so I'm a bit uncertain about needing the added capacity of 2 batteries.
I guess I'll have to open up the electric panel to see what is in there and then figure out if it may or may not be appropriate for charging an AGM battery.
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Old 06-13-2021, 11:02 AM   #6
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1 pop-up, 3 travel trailers, 1 fifth wheel, all of them plugged in 24x7x365 at home and camping, all year round (25 years worth). The only them they were not plugged in is when actually traveling on the road. Never had a problem with any battery.
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Old 06-13-2021, 11:26 AM   #7
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Quote:
Originally Posted by Jason687 View Post
Thanks for all the helpful advice. Some further info...
My rig came with a single group 24 deep cycle marine battery. Looks like the box could accommodate a group 27. I'm considering replacing with a UB1210000 AGM 12V battery (or possibly two of them).

I did install two 6V batteries in our last 5th wheel (and upgraded the charger to a 4 stage smart charger) but, over 17 years we have not actually boondocked... so I'm a bit uncertain about needing the added capacity of 2 batteries.
I guess I'll have to open up the electric panel to see what is in there and then figure out if it may or may not be appropriate for charging an AGM battery.
Jason, I replaced my Group 24 with a Group 27 and it fit perfectly.
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Old 06-13-2021, 09:11 PM   #8
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Quote:
Originally Posted by Jason687 View Post
Thanks for all the helpful advice. Some further info...
My rig came with a single group 24 deep cycle marine battery. Looks like the box could accommodate a group 27. I'm considering replacing with a UB1210000 AGM 12V battery (or possibly two of them).

I did install two 6V batteries in our last 5th wheel (and upgraded the charger to a 4 stage smart charger) but, over 17 years we have not actually boondocked... so I'm a bit uncertain about needing the added capacity of 2 batteries.
I guess I'll have to open up the electric panel to see what is in there and then figure out if it may or may not be appropriate for charging an AGM battery.

The AGM batteries use the same charging as any lead acid battery. A gel cell or a lithium battery use a different charging format.
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Old Yesterday, 05:22 AM   #9
Dave W
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At that vintage, it possibly has a WFCO 9800 series converter rather then an integrated 'power center'. There is a fair amount of information on the 'net about their operation. They are pretty reliable though the cheap 12VDC ADDA fans they use for cooling can vibrate and get noisy - I have 2 converters waiting for my attention and new fans. These converters have a float ability and will not overcharge your battery.


Battery size - I usually install a Group 29/31 though the current one is a Gr27 due to availability when needed. Whichever one is used, the trailer is left plugged in 24/7/365
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