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09-12-2017, 09:26 PM
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#1
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Rivet Master
2014 30' Flying Cloud
Tampa
, Florida
Join Date: May 2016
Posts: 1,364
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Using external charger?
I was wondering - would I be able to use an external charger like one of these
https://no.co/products/charging/multipurpose
To keep my batteries charged?
My use case - my trailer is "stored" in an RV park and is plugged in 24x7. I don't do many trips. I use it every weekend though. So I keep the Use/Store button in the Store position during the week, and set it to Use on weekends.
I'm thinking I can leave that button in Store position permanently and connect an external charger. I'm not sure if I have to disconnect the batteries from the trailer before I do this. Do I?
Please don't go down the "upgrade the OEM converter/charger" path. It's a long story, so let's just say that's not an option right now.
I'm curious if I can just clamp on an external charger to the batteries as they are or do I need to disconnect them from the trailer first. Any guidance will be appreciated.
__________________
2014 Airstream Flying Cloud 30 Recliner - WBCCI #4850 - AIR #110821
2018 Nissan Armada SL Tow Vehicle, Equal-i-zer Hitch
Visit Our Flying Cloud blog for my latest adventure!
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09-12-2017, 09:33 PM
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#2
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Registered User
2016 25' Flying Cloud
Fairfield
, California
Join Date: Sep 2016
Posts: 905
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Go ahead and use an external charger, I have had no problems with mine. Mine is a Batteryminder 1.5 amp that does a great job of keeping the batteries topped off. If heavy charging is needed use shore power for a few hours then let the charger top them off and maintain them.
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09-12-2017, 09:44 PM
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#3
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Rivet Master
2014 30' Flying Cloud
Tampa
, Florida
Join Date: May 2016
Posts: 1,364
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Do you leave your batteries connected to the trailer while using your battery minder?
__________________
2014 Airstream Flying Cloud 30 Recliner - WBCCI #4850 - AIR #110821
2018 Nissan Armada SL Tow Vehicle, Equal-i-zer Hitch
Visit Our Flying Cloud blog for my latest adventure!
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09-12-2017, 10:49 PM
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#4
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Rivet Master
2015 30' Classic
Pleasanton
, California
Join Date: Jan 2015
Posts: 745
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This charger should be fine.
Simply connect the external charger directly to the battery terminals. You won't do any harm if the use/store switch happens to be in the "use" position, but your batteries will be better served if you double check and make sure you've selected the "store" position.
__________________
Al, K6IV
2015 30' Classic, "Chez Nu"
2014 RAM 2500 w/Cummins Diesel
ProPride Hitch, 400 W Solar
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09-13-2017, 01:24 AM
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#5
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Registered User
2016 25' Flying Cloud
Fairfield
, California
Join Date: Sep 2016
Posts: 905
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Quote:
Originally Posted by FCStreamer
Do you leave your batteries connected to the trailer while using your battery minder?
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Yes I do. Actually installed a ring connection with a quick connect to the battery.
This way I can disconnect/ comnect swiftly as needed
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09-13-2017, 05:11 AM
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#6
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Rivet Master
2009 27' FB Flying Cloud
1982 31' International
1991 35' Airstream 350
Jay
, Oklahoma
Join Date: Oct 2006
Posts: 1,706
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The store/use switch disconnects the batteries from the trailer except for the propane detector and the tongue jack.
The detector is the problem. It runs the batteries down in just a bit.
Turn switch to store, this will prevent the stock convertor from overcharging and use an automatic automotive charger. No need to remove the main battery cables.
Regards,
JD
__________________
Jeff & Cindy
'09 27FB Flying Cloud;'82 31 International
'91 350 LE MH; '21 Interstate 24GT
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09-13-2017, 05:50 AM
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#7
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Rivet Master
2014 25' Flying Cloud
Cuddebackville
, New York
Join Date: May 2007
Posts: 4,346
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That's what I do too. I leave the trailer unplugged and also installed a quick connect directly to the batteries.
__________________
2014 25' Flying Cloud Rear Twin
2019 Ford Expedition Platinum
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09-13-2017, 06:08 AM
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#8
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Rivet Master
2014 30' Flying Cloud
Tampa
, Florida
Join Date: May 2016
Posts: 1,364
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That sounds great! Now, for the charger, I've read many good things about BatteryMinder, but I'm partial to Noco products. I own a couple of their jump starters. I'm thinking this one is the correct one
https://no.co/g3500
Says $80 msrp but it can be bought for around $60. Cheaper is good. They also sell all sorts of quick connect and extension cables.
This one seems better
https://no.co/g7200
With higher amps but costs more (around $100) and seems overkill.
For my specific use case, I'm leaning towards the 3500. Thoughts?
__________________
2014 Airstream Flying Cloud 30 Recliner - WBCCI #4850 - AIR #110821
2018 Nissan Armada SL Tow Vehicle, Equal-i-zer Hitch
Visit Our Flying Cloud blog for my latest adventure!
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09-13-2017, 07:57 AM
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#9
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Rivet Master
2009 27' FB Flying Cloud
1982 31' International
1991 35' Airstream 350
Jay
, Oklahoma
Join Date: Oct 2006
Posts: 1,706
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No need for a high amp charger.
IF the requirement is to simply prevent the batteries from draining during storage, one only needs to provide slightly more amperage than the propane detector draws.
An amp or two will be plenty.
Regards,
JD
__________________
Jeff & Cindy
'09 27FB Flying Cloud;'82 31 International
'91 350 LE MH; '21 Interstate 24GT
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09-13-2017, 09:14 AM
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#10
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Half a Rivet Short
2017 30' Classic
2022 Interstate 24X
Carlisle
, Pennsylvania
Join Date: May 2017
Posts: 15,744
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Hi
You want to avoid the high current "jump start" and "fast charger" models (at least some brands of them) for this kind of thing. Some of them do wacky things when left on full time. Anything that is designed as a "maintainer" sort of device should be adequate.
Bob
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09-13-2017, 01:02 PM
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#11
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4 Rivet Member
2017 27' International
Fall City
, Washington
Join Date: Aug 2013
Posts: 402
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I use the Battery Minder that has a 2, 4, and 8 amp setting, desulfation mode, and supports 2 batteries of the same spec.
__________________
2017 27FB International
2013 Ram 2500 Laramie Crew Cab CTD 4x4
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09-13-2017, 02:22 PM
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#12
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4 Rivet Member
2014 25' FB Flying Cloud
Des Peres
, Missouri
Join Date: May 2016
Posts: 266
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I'm going to use the same over the winter. Does anyone see a need to pull the batteries to inside the house?
That would difficult for me since I barely got these two group 31's wedges in the box and had to modify the lip of the battery box to accomplish this
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09-13-2017, 02:36 PM
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#13
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Rivet Master
2014 25' Flying Cloud
Cuddebackville
, New York
Join Date: May 2007
Posts: 4,346
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Quote:
Originally Posted by Lara Me
I use the Battery Minder that has a 2, 4, and 8 amp setting, desulfation mode, and supports 2 batteries of the same spec.
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Me too.
__________________
2014 25' Flying Cloud Rear Twin
2019 Ford Expedition Platinum
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09-13-2017, 05:04 PM
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#14
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Registered User
2016 25' Flying Cloud
Fairfield
, California
Join Date: Sep 2016
Posts: 905
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It all comes down to how fast do you want to recharge the batteries, and then how does the charger maintain the batteries after they are charged. More amps means a faster recharge, but is there a need for a fast charge while the trailer setting at home?
Then once the batteries are charged will the charger groom and maintain them properly. Both brands according to specs do so.
There is a website (Northwestbatteryschool?) that is very educational. It will help you decide. Knowledge is power.
(hard to type on ones phone while riding the bus)
Matti
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09-13-2017, 06:36 PM
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#15
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Rivet Master
2014 30' Flying Cloud
Tampa
, Florida
Join Date: May 2016
Posts: 1,364
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I pulled the trigger on a Noco G3500. Power is out at the RV park, but I was also able to score a Champion 3500 dual fuel inverter generator. So I'm headed there tomorrow to break in the new generator, install the two new batteries, and install the Noco charger.
Is there a way to disable to Use/Store button? Like a fuse I can pull or something? I'd hate for someone to hit that button by mistake and cause issues with my external charger.
__________________
2014 Airstream Flying Cloud 30 Recliner - WBCCI #4850 - AIR #110821
2018 Nissan Armada SL Tow Vehicle, Equal-i-zer Hitch
Visit Our Flying Cloud blog for my latest adventure!
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09-13-2017, 06:38 PM
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#16
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Rivet Master
2015 30' Classic
Pleasanton
, California
Join Date: Jan 2015
Posts: 745
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Connecting the converter to your batteries won't harm your external charger.
__________________
Al, K6IV
2015 30' Classic, "Chez Nu"
2014 RAM 2500 w/Cummins Diesel
ProPride Hitch, 400 W Solar
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09-13-2017, 07:08 PM
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#17
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Half a Rivet Short
2017 30' Classic
2022 Interstate 24X
Carlisle
, Pennsylvania
Join Date: May 2017
Posts: 15,744
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Hi
Ok, if you want to do the ideal thing, there is a way to set it up. Do you want to spend more money on that sort of setup than the batteries are worth? Assuming that getting 10 or 20% more life out of the batteries isn't worth the cost of a new set, just put the battery minder on them and move on. If you are doing this on an industrial scale with a few thousand batteries, then indeed ... that's different.
Bob
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09-13-2017, 07:47 PM
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#18
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3 Rivet Member
2014 25' FB Eddie Bauer
Glen Arbor
, Michigan
Join Date: Nov 2012
Posts: 171
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I use an external charger and put the camper in store mode. it works great. I have been using Battery Tender brand for several years now and have been very pleased. I leave the batteries in and connected all winter long (Michigan) and they perform very well all year long. I use the two bank model for the AS.
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09-13-2017, 07:48 PM
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#19
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Rivet Master
2014 30' Flying Cloud
Tampa
, Florida
Join Date: May 2016
Posts: 1,364
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Quote:
Originally Posted by alano
Connecting the converter to your batteries won't harm your external charger.
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Would it cook the batteries though?
__________________
2014 Airstream Flying Cloud 30 Recliner - WBCCI #4850 - AIR #110821
2018 Nissan Armada SL Tow Vehicle, Equal-i-zer Hitch
Visit Our Flying Cloud blog for my latest adventure!
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09-13-2017, 08:51 PM
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#20
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Rivet Master
2007 22' International CCD
Corona
, California
Join Date: Jul 2013
Posts: 9,180
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If there is no shore power to the AS, it's no issue.
__________________
Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.
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