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Old 04-07-2023, 06:35 AM   #1
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Putting Lithium Replacement House Batteries in Existing Battery Tray

I am close to changing out my 4 6 volt AGM house batteries with 2 200/206AH lithium batteries. My question is, has anyone put the lithium batteries in the current battery location on the slideout tray? I have been talking with SOK about their marine grade battery and they are recommending it be put inside.
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Old 04-07-2023, 08:20 AM   #2
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I am close to changing out my 4 6 volt AGM house batteries with 2 200/206AH lithium batteries. My question is, has anyone put the lithium batteries in the current battery location on the slideout tray? I have been talking with SOK about their marine grade battery and they are recommending it be put inside.
What rig do you have?
Two batteries wont fit in my tray.
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Old 04-07-2023, 10:58 AM   #3
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What rig do you have?
Two batteries won’t fit in my tray.
The Seneca/Accolade has a slide out tray that holds 6 batteries.
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Old 04-07-2023, 11:03 AM   #4
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The Seneca/Accolade has a slide out tray that holds batteries.

So does mine but one is all you can get in it.
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Old 04-07-2023, 11:10 AM   #5
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I am close to changing out my 4 6 volt AGM house batteries with 2 200/206AH lithium batteries. My question is, has anyone put the lithium batteries in the current battery location on the slideout tray? I have been talking with SOK about their marine grade battery and they are recommending it be put inside.
I have not heard of anybody putting them in the factory Slideout tray. While it is pretty protected, it the manufacturer is recommending to put them inside, I probably would. I would probably put them inside someplace, its a little easier since lithium can be mounted in just about any direction. On mine, I put them up on the carpeted compartment, behind one of the floor support frames.
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Old 04-07-2023, 11:12 AM   #6
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So does mine but one is all you can get in it.
This is the 6 battery tray on a Seneca/Accolade.
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Old 04-07-2023, 11:14 AM   #7
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I have not heard of anybody putting them in the factory Slideout tray. While it is pretty protected, it the manufacturer is recommending to put them inside, I probably would. I would probably put them inside someplace, its a little easier since lithium can be mounted in just about any direction. On mine, I put them up on the carpeted compartment, behind one of the floor support frames.
I’ve seen your setup and it’s awesome along with everything else you’ve done and that’s probably what I’ll do. Thanks!
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Old 04-07-2023, 11:26 AM   #8
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Before I went with Lithium, I had added 2 more AGM for a total of 6 house batteries. I had mounted a Noco marine box in the small compartment in front of the battery compartment. Being it was a sealed box, I didnt worry about stacking stuff around it. It may be possible to mount this sealed battery box on the slide out tray? The SOKs should also fit in this box as its made for 2 6v batteries.
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Old 04-07-2023, 01:23 PM   #9
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I am close to changing out my 4 6 volt AGM house batteries with 2 200/206AH lithium batteries. My question is, has anyone put the lithium batteries in the current battery location on the slideout tray? I have been talking with SOK about their marine grade battery and they are recommending it be put inside.
If you are NEVER going to be charging the lithium batteries below freezing, parked or driving then its fine. Not all lithium batteries have low temperature protection
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Old 04-07-2023, 07:36 PM   #10
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I am just finishing up an install on my m2 Seneca. I moved the batteries and associated wiring into the bay just next to the slide out tray. Originally I was going to work on building a box around the batteries keeping them in the tray but after looking at the wiring and having several wires come right out the lugs I decided to move them inside are correct some of the wiring issues. I bought 3 200 amp Renogy, non heated batteries, I will add a heater to the bay if needed. I think moving them gives you much greater leaway to design something you want vs trying to stuff them into and area that really might not work for you.
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Old 04-07-2023, 10:12 PM   #11
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I installed 4x100ah lithiums in the original battery tray last summer, but bought the freeze protected variety. I did nothing else to protect them from the elements. I wanted 2x200 batteries but couldn't be sure of the fit.
Anyway, it was around 13 for several nights in Virginia this past winter. In February I dewinterized and we've been full-time ever since. I did post this after my install and before several more multi-week trips prior to winterizing in November.Click image for larger version

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Old 04-07-2023, 10:35 PM   #12
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For those that have moved your batteries from the tray, I have found these plastic dry boxes fit nicely in the tray. I can fit 3 across the front of the gray.

Wise 56021 Series Tall Utility Dry Box https://a.co/d/2DlxZqc
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Old 04-08-2023, 05:40 PM   #13
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I appreciate all the input. I think I have decided to install them in the main basement area in the bay behind the battery tray compartment. After messing with the current ones and having the tray out then trying to stuff all the wiring back in so the tray will close is extremely frustrating.

For the planning of what I need to make the upgrade to lithium I decided the following:

- 2, 200AH Lithium Batteries with low temp cutoff and/or built in heaters
- Lithium compatible BIM
- Stock Charger switched to Lithium
- Victron Bluetooth Smart Shunt
- Any additional cables/wires

Initially I want do the minimum thats required and then in the future will upgrade as needed.

Is there anything else I would need to get up and running?
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Old 04-08-2023, 11:15 PM   #14
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Everything on your list looks good. There is one item, the LiBIM vs using a DC to DC chargers, which both have its pros and cons. The LiBIM is the simplest to swap out, retains the boost feature but only charges your batteries 42% of the time per hour because of the timed cycling to protect the alternator and will never fully charge a lithium bank. A DC to DC charges at a lower rate but 100% of the time it is on, and charges at a programmable level to fully charge lithium battery. Here is a good read on the comparison.

https://www.explorist.life/how-to-ch...le-alternator/

I started my swap with the the LiBIM but wasnt getting great charge rates while driving due to the cycling the LiBIM does to protect the alternator. I just finished upgrading to a Victron 12-12-30 DC to DC charger to see if I get better charge rates when driving. Being I had the LiBIM already installed it did some changes to isolate the LiBIM to be able to turn that system off to use the DC to DC charger. In the event that I might need to use the boost feature, I can just turn on 2 disconnect switches and one toggle switch and the boost feature is available or always have a backup charge while driving.
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Old 04-09-2023, 12:58 AM   #15
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Nice option to have. I am on my first trip after installing the lithiums and so far they are operating great. I have a victron dc charger waiting at home and depending on how the unit performs I might install it as an option. We drove seven hours yesterday so it is not a typical drive and the unit fully charged the batteries however i could see that a shorter drive might not fully top them off.

My reservation on installing the dc/dc charger is how do you keep the chassis charged? It would seem I need two chargers or wire the BIM to only activate if the ignition is off. A system like your would provide a good flexibility. Looking forward to hearing more about your results.
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Old 04-09-2023, 01:03 PM   #16
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I installed an additional solar panel for a total 380 watts (plan to install more in future) and threw away the factory installed solar charge controller with a Victron, so while traveling would that help along with the alternator charge the lithium batteries?
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Old 04-09-2023, 01:20 PM   #17
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My reservation on installing the dc/dc charger is how do you keep the chassis charged? It would seem I need two chargers or wire the BIM to only activate if the ignition is off. A system like your would provide a good flexibility. Looking forward to hearing more about your results.
I have the Victron Multiplus II installed which has a separate 4amp max trickle charger built in. When I am plugged into shore power the multiplus charges the coach and chassis batteries. When dry camping, I can turn off the Multiplus trickle charger and I have a small dedicated solar panel to charge the chassis batteries or let the main system charge the chassis. It would be possible to manually control the LiBIM with a simple SPDT switch on the Ignition terminal of the BIM.
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Old 04-09-2023, 01:32 PM   #18
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I installed an additional solar panel for a total 380 watts (plan to install more in future) and threw away the factory installed solar charge controller with a Victron, so while traveling would that help along with the alternator charge the lithium batteries?
Yes, the battery doesnt care how many sources its getting fed from, it will eat it up.
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