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Old 05-13-2015, 09:01 AM   #1
Join Date: May 2015
Posts: 41
Dual battery install

Hi everyone. I want to say that I appreciate everyone's input on my previous threads. I appreciate you all.

So my top priority right now is to install A second 12v battery. My front deck compartment has the existing battery and has space for A second one. Now, I'm not interested in parralel setup that would pull power from both at same time. I just want dual batteries with A switch that allows me to pull from one and switch to other if I wish just like the propane tanks. I haven't really found anything online that provides examples or instruction in doing this. I only come up with parallel setups. I called my local RV dealer that I purchased my trailer from in April. They can do this, but at the cost of $300.00. I want to do it myself to save some cash. Unless that price is reasonable by your standards. That price includes the second battery, case, wiring, and labor. Thoughts?

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Old 05-13-2015, 09:10 AM   #2
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Well, the battery is probably in the $100 range depending on what they are quoting. Plastic box is $10. Wiring can add a few more dollars, plus a switch. So with an hour of labor at $100, the dealer price seems about what you would expect.

Google "battery selector switch" and you'll find some options like the one below. You can certainly do it yourself and save about half of what the dealer quoted.

Blue Sea Systems M-Series Battery Switch Selector


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Old 05-13-2015, 09:18 AM   #3
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This may seem strange but talk to a boat dealer, or google one of the marine sites. Your arrangement is very common on boats and it will be easy to secure a two bank switch. Here is a link to one example

Blue Sea Systems e-Series Battery Selector Switch p/n 9003e

With this type of switch you can draw from bank 1 bank 2, or both batteries at the same type.
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Old 05-13-2015, 09:25 AM   #4
Join Date: May 2015
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Thanks for the links. Does anyone here already have a setup like this? If so, can you post pics and some background info?
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Old 05-13-2015, 09:36 AM   #5
Join Date: Mar 2015
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My problem when I tried this was to get the battery box, the one used in my 5er is a drop in box not the standard bottom bolt box so I could only get it from FR.

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Old 05-16-2015, 11:41 PM   #6
Join Date: May 2015
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Well folks, I finished the dual battery setup. Our second trip will be next weekend. Heading to the Grand Canyon for a week. Anyone ever camped there? I was surprised how far in advance others reserve a spot there.
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Old 05-18-2015, 11:10 AM   #7
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Quest makes a Dual Battery Switch that is waterproof like $30-$60 at west marine.

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