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Old 03-16-2014, 05:09 PM   #1
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Battery question

I just got a new to me Rubicon 2100. It came with a 12 volt battery that does an ok job but not enough for me. I have two 6 volt t-105s and have them now hookup up for house batteries and the 12 volt battery I will use the the power jack. My question is can I hook the three batteries together so the charger will charge all three batteries.
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Old 03-16-2014, 05:37 PM   #2
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You should not mix these up. Even though the two 6 volt batteries are hooked together (for 12V) but I wouldn't mix different battery types and sizes on the same charging system.

On another note- are T-105`s 105 amps? Putting two together does not make 210 amps. You will still only have 105 amps at 12V. I use 2-6V batteries at 225 amp each giving me 225 amps at 12 volts.
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Old 03-16-2014, 05:38 PM   #3
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Two 6-volt batteries in series with one 12-volt in parallel will work but you'll probably have problems because the deep cycle 6-volt batteries will have a different charging resistance than the 12-volt battery. You may find that the charger gets confused and you'll end up with some partially charged batteries. If you're charging these while connected to shore power, why not just invest in a second battery charger?
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Old 03-16-2014, 06:36 PM   #4
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right on I will just use a second charger thank you for the answers you guys it helps a lot. I thought it could be done but the resistance part just did not cross my mind. The T-105's are trojans and they have 220 amp hours. I will be putting in 200 watts of solar to maintain them in the future.
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