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07-05-2023, 09:51 PM
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#1
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Montana Master
Join Date: Apr 2017
Location: 1000 oaks
Posts: 959
M.O.C. #19630
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Battery charging director for dual batteries
Years ago I installed a simple device I found somewhere that would use the existing trailer battery charger and spit the charging circuit to two separate batteries.
I have two 12V batteries that I use via a 1, 2, Off, Both switch. With both batteries off line I want to keep them charged from the existing trailer converter.
I wonder if anyone else knows of the device that will take in the charge line from the converter and send the charging circuit to the battery that is low.
I found dual battery chargers. don't want to go that route.
Found battery isolators, not what I am looking for.
The device I had would sense the battery that was low and charge it and I think after charging that it kept a float charge going to them both until again, one or the other needed a normal charge.
Any ideas?
__________________
2011 2955RL Gen-Y Executive Kingpin
2022 GMC 2500HD Duramax/Alison
4X4 Crew Cab/Standard bed.
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07-05-2023, 11:31 PM
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#2
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,732
M.O.C. #12947
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Why not just switch that device to Both Batteries and just use the built-in converter/charger, which will do an excellent job maintaining your batteries without adding another device.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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07-06-2023, 07:37 AM
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#3
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Montana Master
Join Date: Jan 2022
Location: Shingle Springs
Posts: 2,327
M.O.C. #30417
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The device you describe is a smart charger. Most modern converters are smart. They adjust the state of charge based upon the need to prevent overcharging. I don't think your 2011 has a smart charger. Victron several chargers. You might look there.
https://www.amazon.com/Victron-Energ...300619676&th=1
__________________
Tony & Donna & the best dog ever, Murphy.
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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07-07-2023, 12:00 PM
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#4
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Montana Master
Join Date: Apr 2017
Location: 1000 oaks
Posts: 959
M.O.C. #19630
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Thanks guys for the responses.
I want to use the on board charger, no problem there.
I have two independent battery banks of 12V each that I use one at a time. Never use the All position on my switch.
The device I had before would send the charge from the on board converter to one battery bank or the other and never to both at the same time.
It was similar to a motorhome charging system that would send charging current to the house batteries OR the starting battery to keep both systems charged.
I just want the device that directs the charge and not a new charger.
__________________
2011 2955RL Gen-Y Executive Kingpin
2022 GMC 2500HD Duramax/Alison
4X4 Crew Cab/Standard bed.
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07-07-2023, 12:06 PM
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#5
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,971
M.O.C. #20477
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Brian,
What do you see as the downside of using the all position?
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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07-07-2023, 12:15 PM
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#6
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Montana Master
Join Date: Apr 2017
Location: 1000 oaks
Posts: 959
M.O.C. #19630
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Batteries are not of the same age or aH rating.
__________________
2011 2955RL Gen-Y Executive Kingpin
2022 GMC 2500HD Duramax/Alison
4X4 Crew Cab/Standard bed.
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07-08-2023, 08:08 AM
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#7
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,755
M.O.C. #24086
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Maybe a BIM?
Why not just wire the batteries in parallel?
__________________
Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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07-08-2023, 11:35 AM
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#8
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,732
M.O.C. #12947
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Can you wire in another converter, like a floor mounted unit and use the existing one for one battery bank and the new converter for the other bank?
__________________
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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08-19-2023, 10:12 AM
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#9
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Established Member
Join Date: Jul 2023
Location: Wherever we park
Posts: 17
M.O.C. #33040
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What you are looking for is this.
Magnum Energy Smart Battery Combiner.
Had one in my Open Range 5th Wheel. Works great.
__________________
Livin' the Dream
Dennis and Linda
Truck: 2020 Ram 3500HD Dually
Rig: 2023 Montana 3793RD, Disc Brakes
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