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Old 08-26-2015, 08:58 AM   #11
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A problem I have with your setup:

When running on the genset the television 12V outlet will be powered by the converter, not the battery. So you won't be seeing battery health until you disconnect the "shore power" and the converter is dropped from the circuitry.

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Old 08-26-2015, 09:36 AM   #12
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Originally Posted by dangerdave View Post
May not be the best choice, although one came with the TT. I bought the other to match.

Are you guys doing the 2x6V in series thing? Is this better than 2x12V in parallel? Do I even understand that correctly?
Mike837go is correct. When you want to take a battery reading after charging, you need to let the batteries rest for awhile and then check the voltage.

As for if your batteries are the best choice, that depends on what you plan on using them for.. Just to perform as a TT battery with no dry-camping then any RV/Marine battery will fill the need. If you plan on doing some dry-camping.. then you need to look at it from another angle. You will need to know what your DC electrical needs are currently and what they will be in the future and then move over to a TRUE DEEP CYCLE battery that will fit your needs and $$$ BUDGET.

A few things to understand are that electric motors (heater fan, water pump, non LED lights...) are not a batteries friend. They will drain your batteries at a pretty good rate.

A pair of 6 VDC batteries will give you more Ah's than a regular set of 12VDC batteries, BUT in each of the catagories they have batteries rated with a lot more Ah's, but at a cost.

Some members just added a 3rd 12VDC battery for an additional 85Ah's and are happy with the results. I opted for 2 Trojan T-145 6 volt batteries (260Ah), which for my needs is fine. Just remember that if you have an 85Ah battery you really can only use 43Ah's (about the 12.0VDC mark), which is the 50% rule

If these are new batteries, and you have room for one more, you may just want to add a 3rd battery (cheaper) and when they reach the end of their lives you can upgrade to a better selection.


Here is a link to my "RVing with SOLAR" community on this forum. Look for the posts regarding 6volt vs 12 volt batteries. It will give you a the (easy to understand) difference between batteries.

2013 Jayco Eagle 284BHS
250Watt Grape Solar Panel, MorningStar MPPT 60 Charge Controller
1500 Watt Ramsond PSI, 2 Trojan T145 Batteries (260Ah)
2 - AirSight Wireless IP Cameras (used as rear view cameras)
EnGenius WI-FI extender, D-Link wireless (n) modem
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Old 08-26-2015, 09:48 AM   #13
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Don is right on... I went with 3 pairs of Trojan T105's 220 ah.. for a total of 660 ah BUT if you are not boondocking it is a waste of money.. those that go from campground to campground or spend a night at Wal-mart do not need this system. We really need to know how you plan to use your RV to give you the most cost effective way to set up.
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 765 watts of solar, 6-6 volt batteries (696 amp hour), 2000 watt (4000 surge) whole house inverter.
175 days boondocking in 2017
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Old 08-27-2015, 07:49 AM   #14
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Thank you guys for the great information. We exclusively dry camp, never hook up. This has been educational, if not a bit frustrating.

I get the picture now my dual purpose Crown batteries weren't the right thing for the job.
2018 Jayco 34RSBS
2015 Ram 2500 Big Horn Cummins Diesel 4x4
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2 x Golden Retrievers
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Old 08-27-2015, 09:29 AM   #15
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dangerdave have a read here, or a few nights reading! Lots of info to go through but sounds like you want to understand your batteries and this will help.


If you exclusively dry camp I would recommend installing one or two solar panels for battery maintenance and keep the generator if needed for running AC or the microwave. I have 300Watts of solar panels and I have never needed to plug in my trailer to charge the battery since installing them. I have actually turned off the converter so even when we are plugged in it is not charging the battery.

Solar, done right, is not that expensive and is pretty efficient! Especially living in Phoenix!
2014 Jayco Swift 281BHS, 300W Solar!
2015 F250 XLT 4x4 Crew Cab, Short box, 6.2 gas
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Old 08-27-2015, 09:38 AM   #16
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Holy mackerel, that's amazing information. I will certainly digest.

I'm constantly amazed at the level of expertise people have around here.

2018 Jayco 34RSBS
2015 Ram 2500 Big Horn Cummins Diesel 4x4
19xx Beautiful Wife
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