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Old 03-07-2019, 04:30 PM   #1
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2019 27' Tommy Bahama
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6 Volt conversion

Hi everyone. First time to post but have been following for almost a year.
I have a 2018 TB 27fb. I am converting from twin 12’s to twin 6 volt batteries. What I’m looking for is someone that has a picture they will share of their batteries to insure I am connecting everything right the first time. I also have one positive lead that is mounted to a 100 bus fuse at the battery. Can both positive leads from trailer mount to same post or is it possible to mount one to each battery. Another question is how much clearance is needed above the terminals to insure there is not any arcing going on with top of battery box. Thanks in advance for your assisatance.
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Old 03-07-2019, 05:00 PM   #2
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Here's your picture

I upgraded our 2018 27TB to 6V Lifeline AGM batteries in December. The conversion was easy -- the batteries fit fine inside the box. The attached picture is what it looked like before the conversion.

Arcing shouldn't be an issue, but to be doubly certain, cover all the posts/connections that are above ground potential with rubber caps.

I moved all the positive wires and negative wires to their own buss bars, and added a cutoff switch (on the positive side). All Blue Seas parts, FWIW. It's tight, but it all fit.

Jeff
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Old 03-07-2019, 05:04 PM   #3
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Welcome

Starrman,

A good place to find the definitive "6 volt in series" info is the web site of your battery manufacturer or here as an example from the Trojan Battery site:

https://www.trojanbattery.com/pdf/Tr...UsersGuide.pdf

Note the torque values and wiring diagrams. All important stuff.

I have never taken load off my battery bank other than at the "terminal" terminals as indicated in the diagrams. You need both batteries in the "loop" to achieve 12 volts; someone more clever than me might have an idea for you.

Clearance to avoid metal to metal contact should be maintained by the hold down system in the box. If your measurement of box height and battery terminal height indicates they will contact, you will have to address that - some here have added aluminum channel around the top of the battery box, after drilling out the lid hinge attachment rivets, and re-riveted the lid hinges to the aluminum channel. Search battery box modification in the forum.

Even with ample clearance, I tend to cover the exposed terminals at the negative and positive connections to the coach with a rubber cover. Call me belt and suspenders guy. Also helps prevent inadvertent contact while I am working inside there.
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Old 03-07-2019, 05:05 PM   #4
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Quote:
Originally Posted by JeffE View Post
I upgraded our 2018 27TB to 6V Lifeline AGM batteries in December. The conversion was easy -- the batteries fit fine inside the box. The attached picture is what it looked like before the conversion.



Arcing shouldn't be an issue, but to be doubly certain, cover all the posts/connections that are above ground potential with rubber caps.



I moved all the positive wires and negative wires to their own buss bars, and added a cutoff switch (on the positive side). All Blue Seas parts, FWIW. It's tight, but it all fit.



Jeff


Jeff,
Do you have a picture of the post conversion?
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Old 03-08-2019, 07:38 PM   #5
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2018 27' Tommy Bahama
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Photo after conversion

The attached photo shows the battery box after moving all connections to buss-bars and replacing the Interstate 12V batteries with Lifeline 6V batteries.

Jeff
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Old 03-08-2019, 07:42 PM   #6
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Here’s my blog entry covering this.

http://www.airforums.com/forums/blog...-upgrade-2923/

http://www.airforums.com/forums/blog...-install-2924/
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