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05-03-2019, 05:40 PM
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#1
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Senior Member
Join Date: Feb 2016
Location: Chula Vista, CA
Posts: 114
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Are 2 trailer batteries necessary?
Our TT came with 2 batteries. Due to health reasons we always camp with hookups for my oxygen concentrator and CPAP. One of the batteries is dead and should be replaced, however maybe we can live with only one battery. The only loads on the battery will be the rv fridge running on propane when the TV is not running, and emergency braking power (which we hope to never need). Opinions on 1 vs 2 batteries?
Paul
2016 FR Wildwood X-lite 231RKXL
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05-03-2019, 05:47 PM
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#2
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Senior Member
Join Date: Jul 2014
Posts: 35,417
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You will be fine with one battery.
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05-03-2019, 05:51 PM
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#3
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Senior Member
Outdoors RV Owners Club
Join Date: Apr 2018
Location: Seattle
Posts: 469
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You’ll be fine with one 12V. If they were 6V, you’d need two.
__________________
2013 ORV Creek Side 18CK
2018 Expedition Max FX4
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05-03-2019, 06:37 PM
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#4
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Senior Member
Outdoors RV Owners Club
Join Date: Sep 2018
Location: Mission BC
Posts: 739
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If your always plugged into shore power, you will be fine. Get out and enjoy.
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2018 Black Rock 24kts, 300 watts Solar, 4-230ah gc2’s
2008 Dodge 3500 4x4, 6.7, delete, LB, 6 spd man. Firestone bags.
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05-03-2019, 06:45 PM
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#5
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Community Moderator
Monaco Owners Club
Join Date: Jul 2016
Location: Central, Arkansas
Posts: 11,285
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As long as you have shore power no batteries are "necessary" but it makes life easier to have at least one 12V.
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2004 Beaver Monterey Laguna IV
Cummins ISC 350HP Allison 3000 6 speed
2020 Chevy Equinox Premier 2.0t 9 speed AWD
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05-03-2019, 08:04 PM
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#6
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Senior Member
Join Date: Jul 2014
Posts: 35,417
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Quote:
Originally Posted by spdracr39
As long as you have shore power no batteries are "necessary" but it makes life easier to have at least one 12V.
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He needs at least one battery for the breakaway brakes. Its a trailer.
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05-03-2019, 11:08 PM
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#7
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Senior Member
Join Date: Feb 2016
Location: Chula Vista, CA
Posts: 114
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Thanks for the quick replies. 0ne battery it is.
Paul
May the Forest be with You!
__________________
Paul & Sue
2018 Thor Axis 25.3
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05-04-2019, 12:56 AM
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#8
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,138
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Have you checked the water in the good battery?
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2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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05-04-2019, 11:44 AM
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#9
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Registered User
Outdoors RV Owners Club
Join Date: Jan 2014
Location: La Verne, Calif
Posts: 3,649
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You could always add a Honda 1000 or 2000 watt gen for emergency 120V power. One good 12V battery will work just fine.
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05-04-2019, 12:11 PM
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#10
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Senior Member
Join Date: Feb 2018
Posts: 1,285
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You may want to look at how the pair of batteries were wired. Sometime the 2nd battery the positive and negative cable from the trailer are connected to one battery and the 2nd battery is connected to the first battery using inadequate wire. The 2nd battery doesn't get a good charge and is not being fully utilized.
The correct way would be to use large cables linking each batteries positive and negative posts. The trailer positive wire would be connect to one battery and the trailer negative wire would connect to the other battery. The cable size would be 4 AWG or thicker if not using an inverter.
__________________
Jeff--
Arctic Fox 22G w/1440 watts solar/GMC2500HD Double Cab with Leer Cap w/740 watts solar
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05-04-2019, 02:55 PM
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#11
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Senior Member
Join Date: Sep 2012
Location: Palm Coast Florida
Posts: 12,995
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FYI - if you even need to replace a battery buy a group 29/31 as it will be a lot better than a group 24 battery for not much more $$$. You may need a larger battery box but it will be worth it.
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05-04-2019, 11:14 PM
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#12
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Senior Member
Join Date: Feb 2016
Location: Chula Vista, CA
Posts: 114
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Batteries were load tested by RV repair shop when getting new nose jack. My fault for letting sit all winter without periodically charging. I made sure they were wired in parallel when I added a disconnect switch.
I might do the generator. Last summer had a power failure. Had enough batteries for oxygen but it was hard to sleep without the CPAP.
Paul
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05-05-2019, 07:32 AM
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#13
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Senior Member
Join Date: Feb 2018
Posts: 1,285
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I run my CPAP off of 12 volt DC cable when using my trailer. You may want to see if that is an option. I have a Philips Respironics Bipap AutoSV and they sell a cable that plugs into 12 volt DC.
__________________
Jeff--
Arctic Fox 22G w/1440 watts solar/GMC2500HD Double Cab with Leer Cap w/740 watts solar
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