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Old 06-26-2015, 05:26 PM   #1
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Converting TT to 6v and recharging?

I have read through many threads that talk about how much better it is to run two 6V batteries in series. I will be doing this to my TT but haven't read much about the charging of this setup. My current setup is one 24Group Centennial RV/Marine Battery. Since it's in a TT, I assume I don't need "cold cranking amperage."

1) Can I just charge it via generator or vehicle the same as my 12V?
2) When not in use, can I use a trickle charger the same way I would for a 12V? Leave the batteries in series and connect the charger.

Thanks,
Zac
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Old 06-26-2015, 05:54 PM   #2
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When connected in series, treat them like a 12 volt battery.

So 1) yes, 2) yes
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Old 06-26-2015, 08:22 PM   #3
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Quote:
Originally Posted by twinboat View Post
When connected in series, treat them like a 12 volt battery.

So 1) yes, 2) yes
This is the correct answer. Just treat them like a 12 volt. Be sure the positive house cable is on one battery and the negative house cable is on the other for balanced charging.
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Old 06-27-2015, 09:52 AM   #4
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Zac-

The 2 6's will probably require more maintenance than you did on the'24.

Get yourself a good hydrometer and follow the below user's guide (even if yours are not Trojan):

http://www.trojanbattery.com/pdf/TRJ...UsersGuide.pdf
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Old 06-27-2015, 10:21 AM   #5
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I can't imagine any reason that two 6V batteries should require more maintenance than one 12V battery. Actually, the charging current will be at a lower percentage of the battery capacity, so there should be less of a tendency to boil off water.

Joel
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Old 06-28-2015, 09:02 AM   #6
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Besides the physical:
twice the batt boxes and tiedowns
twice the weight to remove and replace if stored
twice the terminals and 1 added wire for anti-corrosion
twice the acid

If Zac's rig is going to be used for boondocking, there is the care and feeding of true deep cycle batts for a "return on investment" of twice (or more) of the $$$. To include a capability for a 15.5-16 volt charger (or solar) for top charging and equalizing plus the time involved to measure and monitor.

YMMV.
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Old 06-28-2015, 09:22 AM   #7
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You may see some capacity improvement but you are still on a 12 V system. The problem you may have is whether the GC-2's will fit in your setup. The dual golf car system is popular because the batteries have a price edge due to the volume of production. That works in a DP with a slide out battery tray and ample vertical clearance but may not fit a lot of other equipment. Measure first. IF they fit that gets you high capacity at the lowest cost. If they do not fit you will probably not get a significant difference between two 12 V in parallel or 2 6 V in series with the same size cases either way.

If the battery is rated in CCA you do not want it. It is not a deep cycle storage battery. If is a starting battery.
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Old 06-28-2015, 09:28 AM   #8
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Thanks for all the info folks. Im on the fence now as to wether I want to still do this. A buddy brought up the fact that if one battery fails, Im screwed. Anyone run two 6v series and one 12 volt? I have a significant amount of room on my tongue.
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Old 06-28-2015, 09:36 AM   #9
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I have 2, 6 volt gc2s in series and 1, 12 volt battery for my house loads.

The New to me, MH had a new 12 volt in it and I added the pair of 6 volts to the system.

Been a year, and It works
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Old 06-28-2015, 09:45 AM   #10
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Quote:
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I have 2, 6 volt gc2s in series and 1, 12 volt battery for my house loads.

The New to me, MH had a new 12 volt in it and I added the pair of 6 volts to the system.

Been a year, and It works
Great, thanks. Do you have a switch to swap between the setup? Or just run both unrestricted?
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Old 06-28-2015, 10:02 AM   #11
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Unrestricted. Check out the website, "yandina.com".

There is some info in the combiner section about doing it.
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Old 06-30-2015, 09:33 AM   #12
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Jeez! Most RVs have a single 12v battery and no one talks about being screwed if it fails! As for maintenance, I have the watering caps on my dual Trojans and after a winter of being on a Battery Minder while still in the RV at temps to 30 below, they barely took any water at all. So no lugging batteries around for winter storage and they last 2 or 3 times as long as regular RV batteries. I bought mine at a golf cart sales place at a better price than I found online.
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Old 06-30-2015, 10:05 AM   #13
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Jeez! Most RVs have a single 12v battery and no one talks about being screwed if it fails!
LOL!!! Good point!!!
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Old 06-30-2015, 12:04 PM   #14
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If you find yourself with a dead 6v battery, the other is likely on its way out as well. If you are somewhere you can't get what you want in a 6v, just buy a 12v RV battery at Wally World as a temporary replacement for the pair. When you get to where you can get the pair you want, the 12v can be sold on Craigs List at a discount to recoup part of your money. It just isn't that hard. But if you think it is, just stick with a 12v pair.
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