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Old 04-19-2012, 03:49 PM   #1
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Question about adding 2nd battery and switch

Am considering adding a second battery to our TT. Also would like to add a switch. Have some questions.

I understand how to wire the batteries in parallel. Since I am not depending on a battery to start an engine like with a boat would I be better off to wire the batteries in parallel and put a disconnect switch between them and the TT or if I use a 4 position battery switch (off, 1,2, both) can I use that instead of wiring the batteries in parallel?

I guess maybe that is my real question, does a battery switch on "both" serve the same as if the batteries are wired parallel?
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Old 04-19-2012, 03:59 PM   #2
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I have a disconnect that only works on one bank because of my two 6-volt setup, but I would do it this way if I had two 12-volt batteries.

Using a disconnect like this ...





I would wire like this which would give me a choice of either battery or the two together (in parallel)....
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Old 04-19-2012, 04:05 PM   #3
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Triguy is correct and its also how mine is wired
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Old 04-19-2012, 04:40 PM   #4
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It just occurred to me that the diagrams could be clearer. Those were from Blue Sea who caters to boaters. Here's some direction catering to campers if and when you do this...
  • Disconnect the negative from your original battery (battery 1).
  • Install positive from battery 1 to terminal one on the switch.
  • Install positive from battery 2 to terminal two on the switch.
  • Install wiring from the trailer (that had previously been wired to the positive on battery 1) to the common terminal of the switch.
  • Make sure selector is "OFF"
  • Attach a ground from battery 2 to the frame.
  • Reattach the negative cable to battery 1.
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Old 04-19-2012, 05:34 PM   #5
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Quick question guys new to the battery disconnect so if you hook these up as you have said when you pull the battery disconnect will it disconnect both as well . thanks
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Old 04-19-2012, 05:51 PM   #6
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U can run 1 or 2 neither or both
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Old 04-19-2012, 07:00 PM   #7
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My old RV had a switch like this but had been wired with 2 current blocking diodes positive side of both diodes hooked to load (house side) and then negative side of each to bat 1 and 2 respectively. This allowed both the batteries to charge but not drain in any position, but once the battery was selected the power could flow freely in both directions on that battery.
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Old 04-20-2012, 08:33 AM   #8
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follow up

Thanks for the replies, quick follow up. I am assuming (dangerous I know) that if I am using a switch and have it set on "both batteries" for example if the convertor is running then both batteries would be getting charged, correct?
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Old 04-20-2012, 08:34 AM   #9
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Correct!
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Old 04-20-2012, 08:55 AM   #10
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I am glad we all could help you, wvcampincpl!

Jar3316 - that's an interesting idea with the diode. I would have never thought of that.
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