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Old 01-29-2023, 04:31 PM   #1
Sienna
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Default Moving batteries from the tongue to the back

Anyone have experience moving the batteries from the tongue to the back compartment in a 2720. I have the front bed version. I believe I would have to add ventilation On the bottom of the compartment so it is not blocked when folded up. This would help with security of the batteries.
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Old 01-29-2023, 07:37 PM   #2
Shane826
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TM uses this box and runs the vent through the side wall.

https://a.co/d/es7hHh5

Camco makes a similar one that comes with the hose and vent assembly..

https://a.co/d/7656s03

Yes, the through-the-wall vent is technically blocked when the camper is closed. Note both those boxes have a top and bottom vent. TM digs out the floor of the storage cubby with a screen underneath to nestle the box in place. They cut off the bottom outlet so it sits flat on the screen. I donít really know how much ventilation that creates since hydrogen gas will rise upward. If you donít care about the bottom vent hereís the box without the bottom vent. I donít think Camco makes one that way.

https://a.co/d/hTjZuHb

You will have a helluva time running a vent through the top/roof due to the sliding bed over the top of the rear compartment storage and not to mention the cantilevered folding mechanism of the roof. Also keep in mind that moving the battery/ies to the rear will mess with the balance of the trailer since you are reducing tongue weight.

Iíve yet to find a box for two 6V GC2 batteries with an outlet for a vent hose. I have this one, trying to figure out how to modify it to work in the storage area.

https://a.co/d/4sdiOOY

Let me know if you have any other questions.
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Old 01-30-2023, 06:54 AM   #3
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If you upgrade to a Lithium Iron Phosphate (LiFePO4) you will not need a vent, will incur a weight savings, and will gain battery capacity.....but you'll increase your cost in the relocation.

If you do, you will likely want to upgrade your power converter, as well, to fully change the LiFePO4 battery.

If you're staying with a lead acid based battery, you may want to just investigate a locking battery box and leave the battery where it is.

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Old 01-30-2023, 08:35 AM   #4
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Removing 120# from the tongue of our 2720 and moving it to the rear had me concerned about tongue weight, but I wanted to increase our battery capacity and have a LiFePO4 battery string. So I ended up adding an additional batter string in the rear compartment without eliminating the FLA's on the tongue.

I had already upgraded the Power Center to a PD4645 with boost charging so I use it, and manual battery switches, to charge both battery strings. Only one string or the other can be charged at a time and it does place the burden on me to handle the manual switching, but it works great. I have 412Ah of Lithium in the rear compartment along with the two GC2s on the tongue.

All of the battery management is in the rear compartment along with the lithium batteries. This keeps them hidden from site in a lockable compartment with decoy Lead Acids in the front that actually add to my capacity.

Solar and an inverter will be added this year and it will likely be necessary to tie them both to just the Lithium string but that is ok with me.
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Old 02-07-2023, 02:43 PM   #5
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My 2417 TMs had the batteries under the dinette bench, with the vent going out the side. When the TM is closed, there is still airflow between the top shell and the bottom box. So, ventilation in the rear compartment, with a hole through the side wall should not be a problem.
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Old 02-07-2023, 03:35 PM   #6
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Quote:
Originally Posted by Shane826 View Post
Iíve yet to find a box for two 6V GC2 batteries with an outlet for a vent hose. I have this one, trying to figure out how to modify it to work in the storage area.
Allied Battery makes one. That's where several of us have gotten one for Trojan T-105/125's.

Lots of discussion on the topic via this thread, which has links to other threads with pictures of the box.

https://www.trailmanorowners.com/for...ad.php?t=21247

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Old 02-07-2023, 04:57 PM   #7
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Quote:
Originally Posted by Shane826 View Post
TM uses this box and runs the vent through the side wall.

https://a.co/d/es7hHh5

Camco makes a similar one that comes with the hose and vent assembly..

https://a.co/d/7656s03

Yes, the through-the-wall vent is technically blocked when the camper is closed. Note both those boxes have a top and bottom vent. TM digs out the floor of the storage cubby with a screen underneath to nestle the box in place. They cut off the bottom outlet so it sits flat on the screen. I don’t really know how much ventilation that creates since hydrogen gas will rise upward. If you don’t care about the bottom vent here’s the box without the bottom vent. I don’t think Camco makes one that way.

https://a.co/d/hTjZuHb

You will have a helluva time running a vent through the top/roof due to the sliding bed over the top of the rear compartment storage and not to mention the cantilevered folding mechanism of the roof. Also keep in mind that moving the battery/ies to the rear will mess with the balance of the trailer since you are reducing tongue weight.

I’ve yet to find a box for two 6V GC2 batteries with an outlet for a vent hose. I have this one, trying to figure out how to modify it to work in the storage area.

https://a.co/d/4sdiOOY

Let me know if you have any other questions.
Shane. I had the 2, 6V, [email protected] batteries also. I used the box from allied and it came with a flat top. I cut a 6" square out of the top of the old factory box (which included the vent). I drilled a 2" hole in the new box top and glued & pop-riveted the cut out piece (from the old box top) to the top of my new box.

I think the reason that TM puts in a top and bottom vent was to encourage some circulation and eliminate and low pressure areas.
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Old 02-08-2023, 12:07 AM   #8
larsdennert
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I've towed both a 2720 that had batteries in the front and the 2720sl that had them in the back. I preferred how the sl tows.
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