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Old 06-28-2022, 02:33 PM   #1
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tongue? placement of lithium batteries in micro

I have planned from the beginning to switch to lithium. I would like to do 200AH, but have questions about placement.

My new-to-me (4 days) 166FBS came with dealer-installed new Group 24 Interstates (I wasn't consulted, but they should go quick on Craig's List). I'm not particularly worried about theft, but I can't see anyway to get 200AH of lithium into the rails. 200AH units are too wide; two Group 27s would appear to be too long.

I know a number of folks are putting them inside, but is anyone tongue mounting 200AH of lithium? If so, how are you fitting it?
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Old 06-28-2022, 02:45 PM   #2
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Check out my thread on dual lithium battery box for 2 -100 amp lithium batteries on 166fbs I built.
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Old 06-28-2022, 03:42 PM   #3
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OK, yours looks interesting. I've been searching since I posted, and I'm wondering if the batteries might fit side-by-side and north-south instead of east-west. I don't know if that would allow them to go far enough forward to clear the diamond plate, but if so I could possibly start with a commercial dual Group 27 tray (of which there appear to be an abundance) and build a box up from that.
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Old 06-28-2022, 03:59 PM   #4
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It mounts ON Top of existing battery tray. Key is to notch front corners of box 1/4" to move it forward enough to give nice clearance to curved front of camper. Have plenty of room for 2 Battleborns and a shunt.
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Old 06-28-2022, 05:03 PM   #5
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I put my lithium battery inside, to not worry about it getting below freezing. You can use a storage area, or find room behind/under a cabinet, or under the sofa, etc. Mine is under the stove, behind the large drawer. That doesn't work on your model because the water pump is there.

Also, if you can find smaller group 24 lithiums, like the Lion Energy ones, they will fit your OEM battery boxes.
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Old 06-28-2022, 05:13 PM   #6
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Yes, I would expect to put it on top of the rails. Mounted side-by-side a pair of Group 27s are only about 15 inches, so could sit forward until stopped by the propane tanks. Wouldn't want to go that far, but ideally balance better on those rails.


The problem with Group 24 Lithiums is that they are "only" 75 or 80AH. If I'm going to spend for a pair of batteries I want to get the most bang for my buck.
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Old 06-28-2022, 06:12 PM   #7
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Check out Lion Energy they have 100 amp/hour group 24 batteries.
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Old 06-28-2022, 07:44 PM   #8
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I guess I'm cheap, but I'm really not willing to pay the price for prismatic cells, or even the price of Battle Born.
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Old 06-28-2022, 09:05 PM   #9
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I went to a Renogy 100 AH. To keep it out of the cold while camping and for safety I put it inside, under the bed right at the front of the 195RB. I drilled through the floor and pulled the existing battery cables up through the floor. Then I added wiring to/from the solar and battery all in that area. It also gives me some room on the tongue to add a work box for tank drain items and a few other things.

Don't know why a 200 would be any different.
I did mount my battery in a conventional battery box to keep the odd item from shorting the wires. I didn't get a heated battery as I don't camp during very cold winter. ( I stay in Venice, FL and bicycle every day instead.)
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Old 06-28-2022, 10:06 PM   #10
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Yeah, cold doesn't phase me much either. Our winter travel in past years has been Arizona and Florida. At home, we live in one of the few places (in the world) that has never measured high temperatures or low temperatures (as most people would define hot and cold). We saw 75 earlier this month (highest so far this year) and it set a record for the day.
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