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Old 04-20-2011, 12:11 PM   #11
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If and when you do decide to get new batteries, I would go with the 6 volts. The camping we do is much different than yours, we dry camp about 70 days a year. I have run my Trojan T105 6 volts for 8 years through 2 different trailers and they are now getting to the point where I have to change them. I do have 3 100 watt solar panals keeping the 6 battries charged, as well as an inverter/charger that will start the genset if the battry power gets to low, it has only started the gense once about 4 years ago, we had been dry camping and it was overcast and rain for 11 days, it was cold enough to run both furnaces at night and we did watch the TV (36" plasma) 3 or 4 hrs a night (because it was raining) on the 10th night, power finally dropped below 11.2 volts in the battries and it started the genset. These battries have amasing capacity, I need new ones this year and I am buying new 6 volt Trojan T105's.
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Old 04-20-2011, 01:13 PM   #12
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I camp 2 or 3 times a year dry as well, and I just added a second Interstate 12v deep cycle to mine, and I use one until it starts to die, then switch the wires to the other for the remainder of the trip. I also do have a 3500 watt generator, but seldom ever need it. Randy
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Old 04-21-2011, 04:22 PM   #13
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Originally Posted by 08flagvlite View Post
I camp 2 or 3 times a year dry as well, and I just added a second Interstate 12v deep cycle to mine, and I use one until it starts to die, then switch the wires to the other for the remainder of the trip. I also do have a 3500 watt generator, but seldom ever need it. Randy
Thanks for this. It begs the question, though: is it better to have the batteries connected with leads, in the case of the 12v deepcycle battery positive to positive and negative to negative, or is it better to run one battery until low, then switch the wires to the fresh battery? And what gauge connector wire is appropriate for 12v dc batteries?

Logically, I assume that wiring in series would be advantageous since both batteries will charge at the same time and rate. Then again, you know what happens when one assumes.....
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Old 04-21-2011, 04:33 PM   #14
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Originally Posted by Gkconfer View Post
Thanks for this. It begs the question, though: is it better to have the batteries connected with leads, in the case of the 12v deepcycle battery positive to positive and negative to negative, or is it better to run one battery until low, then switch the wires to the fresh battery? And what gauge connector wire is appropriate for 12v dc batteries?

Logically, I assume that wiring in series would be advantageous since both batteries will charge at the same time and rate. Then again, you know what happens when one assumes.....

You do not want to wire 2 12 volt batteries in series....that would give you 24 volts.

You need to wire the 2 12 volt batteries positive to positive, negative to negative. Ideally, the positive to the trailer would come off of 1 battery, and the negative to the trailer comes off of the 2nd battery.
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Old 04-21-2011, 04:42 PM   #15
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Thanks Mtnguy and good catch. I should have said parallel and not series...big difference. I also found the answer to one question regarding proper wire gauge. For the 12v dc, it looks as though 2 gauge is the right choice for a 12" to 18" wire.
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Old 04-21-2011, 04:45 PM   #16
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You do not want to wire 2 12 volt batteries in series....that would give you 24 volts.

You need to wire the 2 12 volt batteries positive to positive, negative to negative. Ideally, the positive to the trailer would come off of 1 battery, and the negative to the trailer comes off of the 2nd battery.
Mtnguy, any chance that a picture of this wiring setup can be found on the site? I looked but didn't find one. Thanks
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Old 04-21-2011, 05:31 PM   #17
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Here you go

The first is two 6 volt in series. The second is 2 12's in parallel.
NOTE: In the 12 volt example, the Ground is NOT on the same battery as the Positive. That keeps current flow through both batteries equal, assuming both batteries are of the same age and recharge status.
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Old 04-21-2011, 05:58 PM   #18
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Originally Posted by 08flagvlite View Post
I camp 2 or 3 times a year dry as well, and I just added a second Interstate 12v deep cycle to mine, and I use one until it starts to die, then switch the wires to the other for the remainder of the trip. I also do have a 3500 watt generator, but seldom ever need it. Randy
Just curious, don't you have room to put both in the system or is there another reason you lug around a second battery not put it in the circuit permanently?
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Old 04-21-2011, 06:27 PM   #19
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Another option for having two 12v batteries, as I do, is to use a battery switch. I picked one up fairly cheaply and mounted it to the TT frame right behind the two batteries on the tongue. With this switch, you hook both batteries to the switch, along with connections to the TT, and then can select battery 1, battery 2, both, or neither (off). Serves the same purpose as 08flagvlite, but also allows you to easily disconnect the batteries so they don't discharge when not in use.
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Old 04-21-2011, 06:33 PM   #20
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Originally Posted by LoryJ View Post
Another option for having two 12v batteries, as I do, is to use a battery switch. I picked one up fairly cheaply and mounted it to the TT frame right behind the two batteries on the tongue. With this switch, you hook both batteries to the switch, along with connections to the TT, and then can select battery 1, battery 2, both, or neither (off). Serves the same purpose as 08flagvlite, but also allows you to easily disconnect the batteries so they don't discharge when not in use.
This is exactly how my 5th wheel battery bank is set up.
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